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chamilo-lms/main/inc/lib/mimetex/mimetex.c

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/****************************************************************************
*
* Copyright(c) 2002-2006, John Forkosh Associates, Inc. All rights reserved.
* --------------------------------------------------------------------------
* This file is part of mimeTeX, which is free software. You may redistribute
* and/or modify it under the terms of the GNU General Public License,
* version 2 or later, as published by the Free Software Foundation.
* MimeTeX is distributed in the hope that it will be useful, but
* WITHOUT ANY WARRANTY, not even the implied warranty of MERCHANTABILITY.
* See the GNU General Public License for specific details.
* By using mimeTeX, you warrant that you have read, understood and
* agreed to these terms and conditions, and that you possess the legal
* right and ability to enter into this agreement and to use mimeTeX
* in accordance with it.
* Your mimeTeX distribution should contain a copy of the GNU General
* Public License. If not, write to the Free Software Foundation, Inc.,
* 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA,
* or point your browser to http://www.gnu.org/licenses/gpl.html
* --------------------------------------------------------------------------
*
* Purpose: o MimeTeX, licensed under the gpl, lets you easily embed
* LaTeX math in your html pages. It parses a LaTeX math
* expression and immediately emits the corresponding gif
* image, rather than the usual TeX dvi. And mimeTeX is an
* entirely separate little program that doesn't use TeX or
* its fonts in any way. It's just one cgi that you put in
* your site's cgi-bin/ directory, with no other dependencies.
* So mimeTeX is very easy to install. And it's equally easy
* to use. Just place an html <img> tag in your document
* wherever you want to see the corresponding LaTeX expression.
* For example,
* <img src="../cgi-bin/mimetex.cgi?\int_{-\infty}^xe^{-t^2}dt"
* alt="" border=0 align=middle>
* immediately generates the corresponding gif image on-the-fly,
* displaying the rendered expression wherever you put that
* <img> tag. MimeTeX doesn't need intermediate dvi-to-gif
* conversion, and it doesn't clutter up your filesystem with
* separate little gif files for each converted expression.
* There's also no inherent need to repeatedly write the
* cumbersome <img> tag illustrated above. You can write
* your own custom tags, or write a wrapper script around
* mimeTeX to simplify the necessary notation.
*
* Functions: ===================== Raster Functions ======================
* PART2 --- raster constructor functions ---
* new_raster(width,height,pixsz) allocation (and constructor)
* new_subraster(width,height,pixsz)allocation (and constructor)
* new_chardef() allocate chardef struct
* delete_raster(rp) deallocate raster (rp = raster ptr)
* delete_subraster(sp) deallocate subraster (sp=subraster ptr)
* delete_chardef(cp) deallocate chardef (cp = chardef ptr)
* --- primitive (sub)raster functions ---
* rastcpy(rp) allocate new copy of rp
* subrastcpy(sp) allocate new copy of sp
* rastrot(rp) new raster rotated right 90 degrees to rp
* rastput(target,source,top,left,isopaque) overlay src on trgt
* rastcompose(sp1,sp2,offset2,isalign,isfree) sp2 on top of sp1
* rastcat(sp1,sp2,isfree) concatanate sp1||sp2
* rastack(sp1,sp2,base,space,iscenter,isfree)stack sp2 atop sp1
* rastile(tiles,ntiles) create composite raster from tiles
* rastsmash(sp1,sp2,xmin,ymin) calc #smash pixels sp1||sp2
* --- raster "drawing" functions ---
* accent_subraster(accent,width,height) draw \hat\vec\etc
* arrow_subraster(width,height,drctn,isBig) left/right arrow
* uparrow_subraster(width,height,drctn,isBig) up/down arrow
* rule_raster(rp,top,left,width,height,type) draw rule in rp
* line_raster(rp,row0,col0,row1,col1,thickness) draw line in rp
* line_recurse(rp,row0,col0,row1,col1,thickness) recurse line
* circle_raster(rp,row0,col0,row1,col1,thickness,quads) ellipse
* circle_recurse(rp,row0,col0,row1,col1,thickness,theta0,theta1)
* bezier_raster(rp,r0,c0,r1,c1,rt,ct) draw bezier recursively
* border_raster(rp,ntop,nbot,isline,isfree)put border around rp
* --- raster (and chardef) output functions ---
* type_raster(rp,fp) emit ascii dump of rp on file ptr fp
* type_bytemap(bp,grayscale,width,height,fp) dump bytemap on fp
* xbitmap_raster(rp,fp) emit mime xbitmap of rp on fp
* type_pbmpgm(rp,ptype,file) pbm or pgm image of rp to file
* cstruct_chardef(cp,fp,col1) emit C struct of cp on fp
* cstruct_raster(rp,fp,col1) emit C struct of rp on fp
* hex_bitmap(rp,fp,col1,isstr)emit hex dump of rp->pixmap on fp
* --- ancillary output functions ---
* emit_string(fp,col1,string,comment) emit string and C comment
* gftobitmap(rp) convert .gf-like pixmap to bitmap image
* ====================== Font Functions =======================
* --- font lookup functions ---
* get_symdef(symbol) returns mathchardef for symbol
* get_chardef(symdef,size) returns chardef for symdef,size
* get_charsubraster(symdef,size) wrap subraster around chardef
* get_symsubraster(symbol,size) returns subraster for symbol
* --- ancillary font functions ---
* get_baseline(gfdata) determine baseline (in our coords)
* get_delim(symbol,height,family) delim just larger than height
* make_delim(symbol,height) construct delim exactly height size
* ================= Tokenize/Parse Functions ==================
* texchar(expression,chartoken) retruns next char or \sequence
* texsubexpr(expr,subexpr,maxsubsz,left,right,isescape,isdelim)
* texleft(expr,subexpr,maxsubsz,ldelim,rdelim) \left...\right
* texscripts(expression,subscript,superscript,which)get scripts
* --- ancillary parse functions ---
* isbrace(expression,braces,isescape) check for leading brace
* preamble(expression,size,subexpr) parse preamble
* mimeprep(expression) preprocessor converts \left( to \(, etc.
* strchange(nfirst,from,to) change nfirst chars of from to to
* strreplace(string,from,to,nreplace) change from to to in str
* strtexchr(string,texchr) find texchr in string
* findbraces(expression,command) find opening { or closing }
* PART3 =========== Rasterize an Expression (recursively) ===========
* --- here's the primary entry point for all of mimeTeX ---
* rasterize(expression,size) parse and rasterize expression
* --- explicitly called handlers that rasterize... ---
* rastparen(subexpr,size,basesp) parenthesized subexpr
* rastlimits(expression,size,basesp) dispatch super/sub call
* rastscripts(expression,size,basesp) super/subscripted exprssn
* rastdispmath(expression,size,sp) scripts for displaymath
* --- table-driven handlers that rasterize... ---
* rastleft(expression,size,basesp,ildelim,arg2,arg3)\left\right
* rastright(expression,size,basesp,ildelim,arg2,arg3) ...\right
* rastmiddle(expression,size,basesp,arg1,arg2,arg3) \middle
* rastflags(expression,size,basesp,flag,value,arg3) set flag
* rastspace(expression,size,basesp,width,isfill,isheight)\,\:\;
* rastnewline(expression,size,basesp,arg1,arg2,arg3) \\
* rastarrow(expression,size,basesp,width,height,drctn) \longarr
* rastuparrow(expression,size,basesp,width,height,drctn)up/down
* rastoverlay(expression,size,basesp,overlay,arg2,arg3) \not
* rastfrac(expression,size,basesp,isfrac,arg2,arg3) \frac \atop
* rastackrel(expression,size,basesp,base,arg2,arg3) \stackrel
* rastmathfunc(expression,size,basesp,base,arg2,arg3) \lim,\etc
* rastsqrt(expression,size,basesp,arg1,arg2,arg3) \sqrt
* rastaccent(expression,size,basesp,accent,isabove,isscript)
* rastfont(expression,size,basesp,font,arg2,arg3) \cal{},\scr{}
* rastbegin(expression,size,basesp,arg1,arg2,arg3) \begin{}
* rastarray(expression,size,basesp,arg1,arg2,arg3) \array
* rastpicture(expression,size,basesp,arg1,arg2,arg3) \picture
* rastline(expression,size,basesp,arg1,arg2,arg3) \line
* rastcircle(expression,size,basesp,arg1,arg2,arg3) \circle
* rastbezier(expression,size,basesp,arg1,arg2,arg3) \bezier
* rastraise(expression,size,basesp,arg1,arg2,arg3) \raisebox
* rastrotate(expression,size,basesp,arg1,arg2,arg3) \rotatebox
* rastfbox(expression,size,basesp,arg1,arg2,arg3) \fbox
* rastinput(expression,size,basesp,arg1,arg2,arg3) \input
* rastcounter(expression,size,basesp,arg1,arg2,arg3) \counter
* rasttoday(expression,size,basesp,arg1,arg2,arg3) \today
* rastcalendar(expression,size,basesp,arg1,arg2,arg3) \calendar
* rastnoop(expression,size,basesp,arg1,arg2,arg3) flush \escape
* --- helper functions for handlers ---
* rastopenfile(filename,mode) opens filename[.tex] in mode
* rasteditfilename(filename) edit filename (for security)
* rastreadfile(filename,islock,tag,value) read <tag>...</tag>
* rastwritefile(filename,tag,value,isstrict)write<tag>...</tag>
* calendar(year,month,day) formats one-month calendar string
* timestamp(tzdelta,ifmt) formats timestamp string
* tzadjust(tzdelta,year,month,day,hour) adjust date/time
* daynumber(year,month,day) #days since Monday, Jan 1, 1973
* dbltoa(d,npts) double to comma-separated ascii
* === Anti-alias completed raster (lowpass) or symbols (ss) ===
* aalowpass(rp,bytemap,grayscale) lowpass grayscale bytemap
* aapnm(rp,bytemap,grayscale) lowpass based on pnmalias.c
* aasupsamp(rp,aa,sf,grayscale) or by supersampling
* aacolormap(bytemap,nbytes,colors,colormap)make colors,colormap
* aaweights(width,height) builds "canonical" weight matrix
* aawtpixel(image,ipixel,weights,rotate) weight image at ipixel
* PART1 ========================== Driver ===========================
* main(argc,argv) parses math expression and emits mime xbitmap
* CreateGifFromEq(expression,gifFileName) entry pt for win dll
* isstrstr(string,snippets,iscase) are any snippets in string?
* ismonth(month) is month current month ("jan"-"dec")?
* unescape_url(url,isescape), x2c(what) xlate %xx url-encoded
* logger(fp,msglevel,logvars) logs environment variables
* emitcache(cachefile,maxage,isbuffer) emit cachefile to stdout
* readcachefile(cachefile,buffer) read cachefile into buffer
* md5str(instr) md5 hash library functions
* GetPixel(x,y) callback function for gifsave library
*
* Source: mimetex.c (needs mimetex.h and texfonts.h to compile,
* and also needs gifsave.c if compiled with -DAA or -DGIF)
*
* --------------------------------------------------------------------------
* Notes o See bottom of file for main() driver (and "friends"),
* and compile as
* cc -DAA mimetex.c gifsave.c -lm -o mimetex.cgi
* to produce an executable that emits gif images with
* anti-aliasing (see Notes below). You may also compile
* cc -DGIF mimetex.c gifsave.c -lm -o mimetex.cgi
* to produce an executable that emits gif images without
* anti-aliasing. Alternatively, compile mimeTeX as
* cc -DXBITMAP mimetex.c -lm -o mimetex.cgi
* to produce an executable that just emits mime xbitmaps.
* In either case you'll need mimetex.h and texfonts.h,
* and with -DAA or -DGIF you'll also need gifsave.c
* o For gif images, the gifsave.c library by Sverre H. Huseby
* <http://shh.thathost.com> slightly modified by me to allow
* (a)sending output to stdout and (b)specifying a transparent
* background color index, is included with mimeTeX,
* and it's documented in mimetex.html#gifsave .
* o Optional compile-line -D defined symbols are documented
* in mimetex.html#options . They include...
* -DAA
* Turns on gif anti-aliasing with default values
* (CENTERWT=32, ADJACENTWT=3, CORNERWT=1)
* for the following anti-aliasing parameters...
* -DCENTERWT=n
* -DADJACENTWT=j
* -DCORNERWT=k
* MimeTeX currently provides a lowpass filtering
* algorithm for anti-aliasing, which is applied to the
* existing set of bitmap fonts. This lowpass filter
* applies default weights
* 1 3 1
* 3 32 3
* 1 3 1
* to neighboring pixels. The defaults weights are
* CENTERWT=32, ADJACENTWT=3 and CORNERWT=1,
* which you can adjust to control anti-aliasing.
* Lower CENTERWT values will blur/spread out lines
* while higher values will tend to sharpen lines.
* Experimentation is recommended to determine
* what value works best for you.
* -DCACHEPATH=\"path/\"
* This option saves each rendered image to a file
* in directory path/ which mimeTeX reads rather than
* re-rendering the same image every time it's given
* the same LaTeX expression. Sometimes mimeTeX disables
* caching, e.g., expressions containing \input{ } are
* re-rendered since the contents of the inputted file
* may have changed. If compiled without -DCACHEPATH
* mimeTeX always re-renders expressions. This usually
* isn't too cpu intensive, but if you have unusually
* high hit rates then image caching may be helpful.
* The path/ is relative to mimetex.cgi, and must
* be writable by it. Files created under path/ are
* named filename.gif, where filename is the 32-character
* MD5 hash of the LaTeX expression.
* -DDISPLAYSIZE=n
* By default, operator limits like \int_a^b are rendered
* \textstyle at font sizes \normalsize and smaller,
* and rendered \displaystyle at font sizes \large and
* larger. This default corresponds to -DDISPLAYSIZE=3,
* which you can adjust; e.g., -DDISPLAYSIZE=0 always
* defaults to \displaystyle, and 99 (or any large number)
* always defaults to \textstyle. Note that explicit
* \textstyle, \displaystyle, \limits or \nolimits
* directives in an expression always override
* the DISPLAYSIZE default.
* -NORMALSIZE=n
* MimeTeX currently has six font sizes numbered 0-5,
* and always starts in NORMALSIZE whose default value
* is 2. Specify -DNORMALSIZE=3 on the compile line if
* you prefer mimeTeX to start in default size 3, etc.
* -DREFERER=\"domain\" -or-
* -DREFERER=\"domain1,domain2,etc\"
* Blocks mimeTeX requests from unauthorized domains that
* may be using your server's mimetex.cgi without permission.
* If REFERER is defined, mimeTeX checks for the environment
* variable HTTP_REFERER and, if it exists, performs a
* case-insensitive test to make sure it contains 'domain'
* as a substring. If given several 'domain's (second form)
* then HTTP_REFERER must contain either 'domain1' or
* 'domain2', etc, as a (case-insensitive) substring.
* If HTTP_REFERER fails to contain a substring matching
* any of these domain(s), mimeTeX emits an error message
* image corresponding to the expression specified by
* the invalid_referer_msg string defined in main().
* Note: if HTTP_REFERER is not an environment variable,
* mimeTeX correctly generates the requested expression
* (i.e., no referer error).
* -DWARNINGS=n -or-
* -DNOWARNINGS
* If an expression submitted to mimeTeX contains an
* unrecognzied escape sequence, e.g., "y=x+\abc+1", then
* mimeTeX generates a gif image containing an embedded
* warning in the form "y=x+[\abc?]+1". If you want these
* warnings suppressed, -DWARNINGS=0 or -DNOWARNINGS tells
* mimeTeX to ignore unrecognized symbols, and the rendered
* image is "y=x++1" instead.
* -DWHITE
* MimeTeX usually renders black symbols on a white
* background. This option renders white symbols on
* a black background instead.
* o See individual function entry points for further comments.
* o The font information in texfonts.h was produced by multiple
* runs of gfuntype, one run per struct (i.e., one run per font
* family at a particular size). See gfuntype.c, and also
* mimetex.html#fonts, for details.
* o mimetex.c contains library functions implementing a raster
* datatype, functions to manipulate rasterized .mf fonts
* (see gfuntype.c which rasterizes .mf fonts), functions
* to parse LaTeX expressions, etc. A complete list of
* mimetex.c functions is above. See their individual entry
* points below for further comments.
* All these functions eventually belong in several
* different modules, possibly along the lines suggested
* by the divisions above. But until the best decomposition
* becomes clear, it seems better to keep mimetex.c
* neatly together, avoiding a bad decomposition that
* becomes permanent by default.
* o The "main" reusable function is rasterize(),
* which takes a string like "f(x)=\int_{-\infty}^xe^{-t^2}dt"
* and returns a (sub)raster representing it as a bit or bytemap.
* Your application can do anything it likes with this pixel map.
* MimeTeX just outputs it, either as a mime xbitmap or as a gif.
* --------------------------------------------------------------------------
* Revision History:
* 09/18/02 J.Forkosh Installation.
* 12/11/02 J.Forkosh Version 1.00 released.
* 07/04/03 J.Forkosh Version 1.01 released.
* 10/17/03 J.Forkosh Version 1.20 released.
* 12/21/03 J.Forkosh Version 1.30 released.
* 02/01/04 J.Forkosh Version 1.40 released.
* 10/02/04 J.Forkosh Version 1.50 released.
* 11/30/04 J.Forkosh Version 1.60 released.
*
****************************************************************************/
/* -------------------------------------------------------------------------
header files and macros
-------------------------------------------------------------------------- */
/* --- standard headers --- */
#include <stdio.h>
#include <stdlib.h>
/*#include <unistd.h>*/
#include <string.h>
#include <ctype.h>
#include <math.h>
#include <time.h>
/* --- windows-specific header info --- */
#ifndef WINDOWS /* -DWINDOWS not supplied by user */
#if defined(_WINDOWS) || defined(_WIN32) || defined(WIN32) \
|| defined(DJGPP) /* try to recognize windows compilers */ \
|| defined(_USRDLL) /* must be WINDOWS if compiling for DLL */
#define WINDOWS /* signal windows */
#endif
#endif
#ifdef WINDOWS /* Windows opens stdout in char mode, and */
#include <fcntl.h> /* precedes every 0x0A with spurious 0x0D.*/
#include <io.h> /* So emitcache() issues a Win _setmode() */
/* call to put stdout in binary mode. */
#if defined(_O_BINARY) && !defined(O_BINARY) /* only have _O_BINARY */
#define O_BINARY _O_BINARY /* make O_BINARY available, etc... */
#define setmode _setmode
#define fileno _fileno
#endif
#if defined(_O_BINARY) || defined(O_BINARY) /* setmode() now available */
#define HAVE_SETMODE /* so we'll use setmode() */
#endif
#if defined(_MSC_VER) && defined(_DEBUG) /* MS VC++ in debug mode */
/* to show source file and line numbers where memory leaks occur... */
#define _CRTDBG_MAP_ALLOC /* ...include this debug macro */
#include <crtdbg.h> /* and this debug library */
#endif
#define ISWINDOWS 1
#else
#define ISWINDOWS 0
#endif
/* --- check for supersampling or low-pass anti-aliasing --- */
#ifdef SS
#define ISSUPERSAMPLING 1
#ifndef AAALGORITHM
#define AAALGORITHM 1 /* default supersampling algorithm */
#endif
#ifndef AA /* anti-aliasing not explicitly set */
#define AA /* so define it ourselves */
#endif
#ifndef SSFONTS /* need supersampling fonts */
#define SSFONTS
#endif
#else
#define ISSUPERSAMPLING 0
#ifndef AAALGORITHM
#define AAALGORITHM 2 /* default lowpass algorithm */
#endif
#endif
/* --- set aa (and default gif) if any anti-aliasing options specified --- */
#if defined(AA) || defined(GIF) || defined(PNG) \
|| defined(CENTERWT) || defined(ADJACENTWT) || defined(CORNERWT) \
|| defined(MINADJACENT) || defined(MAXADJACENT)
#if !defined(GIF) && !defined(AA) /* aa not explicitly specified */
#define AA /* so define it ourselves */
#endif
#if !defined(GIF) && !defined(PNG) /* neither gif nor png specified */
#define GIF /* so default to gif */
#endif
#endif
/* --- resolve output option inconsistencies --- */
#if defined(XBITMAP) /* xbitmap supercedes gif and png */
#ifdef AA
#undef AA
#endif
#ifdef GIF
#undef GIF
#endif
#ifdef PNG
#undef PNG
#endif
#endif
/* --- decide whether to compile main() --- */
#if defined(XBITMAP) || defined(GIF) || defined(PNG)
#define DRIVER /* driver will be compiled */
/* --- check whether or not to perform http_referer check --- */
#ifndef REFERER /* all http_referer's allowed */
#define REFERER NULL
#endif
/* --- max query_string length if no http_referer supplied --- */
#ifndef NOREFMAXLEN
#define NOREFMAXLEN 9999 /* default to any length query */
#endif
#else
#define NOTEXFONTS /* texfonts not required */
#endif
/* --- application headers --- */
#if !defined(NOTEXFONTS) && !defined(TEXFONTS)
#define TEXFONTS /* to include texfonts.h */
#endif
#include "mimetex.h"
/* --- info needed when gif image returned in memory buffer --- */
#ifdef GIF /* compiling along with gifsave.c */
extern int gifSize;
extern int maxgifSize;
#else /* or just set dummy values */
static int gifSize=0, maxgifSize=0;
#endif
/* -------------------------------------------------------------------------
adjustable default values
-------------------------------------------------------------------------- */
/* --- anti-aliasing parameters --- */
#ifndef CENTERWT
/*#define CENTERWT 32*/ /* anti-aliasing centerwt default */
/*#define CENTERWT 10*/ /* anti-aliasing centerwt default */
#define CENTERWT 8 /* anti-aliasing centerwt default */
#endif
#ifndef ADJACENTWT
/*#define ADJACENTWT 3*/ /* anti-aliasing adjacentwt default*/
#define ADJACENTWT 2 /* anti-aliasing adjacentwt default*/
#endif
#ifndef CORNERWT
#define CORNERWT 1 /* anti-aliasing cornerwt default*/
#endif
#ifndef MINADJACENT
#define MINADJACENT 6 /*anti-aliasing minadjacent default*/
#endif
#ifndef MAXADJACENT
#define MAXADJACENT 8 /*anti-aliasing maxadjacent default*/
#endif
/* --- variables for anti-aliasing parameters --- */
GLOBAL(int,centerwt,CENTERWT); /*lowpass matrix center pixel wt */
GLOBAL(int,adjacentwt,ADJACENTWT); /*lowpass matrix adjacent pixel wt*/
GLOBAL(int,cornerwt,CORNERWT); /*lowpass matrix corner pixel wt */
GLOBAL(int,minadjacent,MINADJACENT); /* darken if>=adjacent pts black*/
GLOBAL(int,maxadjacent,MAXADJACENT); /* darken if<=adjacent pts black */
GLOBAL(int,weightnum,1); /* font wt, */
GLOBAL(int,maxaaparams,4); /* #entries in table */
/* --- parameter values by font weight --- */
#define aaparameters struct aaparameters_struct /* typedef */
aaparameters
{ int centerwt; /* lowpass matrix center pixel wt*/
int adjacentwt; /* lowpass matrix adjacent pixel wt*/
int cornerwt; /* lowpass matrix corner pixel wt*/
int minadjacent; /* darken if >= adjacent pts black */
int maxadjacent; /* darken if <= adjacent pts black */
int fgalias,fgonly,bgalias,bgonly; } ; /* aapnm() params */
STATIC aaparameters aaparams[] /* set params by weight */
#ifdef INITVALS
=
{ /* ----------------------------------------------------
centerwt adj corner minadj max fgalias,only,bgalias,only
------------------------------------------------------- */
{ 64, 1, 1, 6, 8, 1,0,0,0 }, /* 0 = light */
{ CENTERWT,ADJACENTWT,CORNERWT,MINADJACENT,MAXADJACENT,1,0,0,0 },
{ 8, 1, 1, 5, 8, 1,0,0,0 }, /* 2 = semibold */
{ 8, 2, 1, 4, 9, 1,0,0,0 } /* 3 = bold */
} /* --- end-of-aaparams[] --- */
#endif
;
/* -------------------------------------------------------------------------
other variables
-------------------------------------------------------------------------- */
/* --- black on white background (default), or white on black --- */
#ifdef WHITE
#define ISBLACKONWHITE 0 /* white on black background */
#else
#define ISBLACKONWHITE 1 /* black on white background */
#endif
/* --- colors --- */
#define BGRED (ISBLACKONWHITE?255:0)
#define BGGREEN (ISBLACKONWHITE?255:0)
#define BGBLUE (ISBLACKONWHITE?255:0)
#ifndef FGRED
#define FGRED (ISBLACKONWHITE?0:255)
#endif
#ifndef FGGREEN
#define FGGREEN (ISBLACKONWHITE?0:255)
#endif
#ifndef FGBLUE
#define FGBLUE (ISBLACKONWHITE?0:255)
#endif
/* --- "smash" margin (0 means no smashing) --- */
#ifndef SMASHMARGIN
#ifdef NOSMASH
#define SMASHMARGIN 0
#else
#define SMASHMARGIN 3
#endif
#endif
/* --- textwidth --- */
#ifndef TEXTWIDTH
#define TEXTWIDTH (400)
#endif
/* --- font "combinations" --- */
#define CMSYEX (109) /*select CMSY10, CMEX10 or STMARY10*/
/* --- prefix prepended to all expressions --- */
#ifndef PREFIX
#define PREFIX "\000" /* default no prepended prefix */
#endif
/* --- skip argv[]'s preceding ARGSIGNAL when parsing command-line args --- */
#ifdef NOARGSIGNAL
#define ARGSIGNAL NULL
#endif
#ifndef ARGSIGNAL
#define ARGSIGNAL "++"
#endif
/* --- security and logging (inhibit message logging, etc) --- */
#ifndef SECURITY
#define SECURITY 999 /* default highest security level */
#endif
#ifndef LOGFILE
#define LOGFILE "mimetex.log" /* default log file */
#endif
#ifndef CACHELOG
#define CACHELOG "mimetex.log" /* default caching log file */
#endif
#if !defined(NODUMPENVP) && !defined(DUMPENVP)
#define DUMPENVP /* assume char *envp[] available */
#endif
/* --- image caching (cache images if given -DCACHEPATH=\"path\") --- */
#ifndef CACHEPATH
#define ISCACHING 0 /* no caching */
#define CACHEPATH "\000" /* same directory as mimetex.cgi */
#else
#define ISCACHING 1 /* caching if -DCACHEPATH="path" */
#endif
/* --- \input paths (prepend prefix if given -DPATHPREFIX=\"prefix\") --- */
#ifndef PATHPREFIX
#define PATHPREFIX "\000" /* paths relative mimetex.cgi */
#endif
/* --- time zone delta t (in hours) --- */
#ifndef TZDELTA
#define TZDELTA 0
#endif
/* -------------------------------------------------------------------------
debugging and logging / error reporting
-------------------------------------------------------------------------- */
/* --- debugging and error reporting --- */
#ifndef MSGLEVEL
#define MSGLEVEL 1
#endif
#define DBGLEVEL 9 /* debugging if msglevel>=DBGLEVEL */
#define LOGLEVEL 3 /* logging if msglevel>=LOGLEVEL */
#ifndef FORMLEVEL
#define FORMLEVEL LOGLEVEL /*msglevel if called from html form*/
#endif
GLOBAL(int,seclevel,SECURITY); /* security level */
GLOBAL(int,msglevel,MSGLEVEL); /* message level for verbose/debug */
STATIC FILE *msgfp; /* output in command-line mode */
/* --- embed warnings in rendered expressions, [\xxx?] if \xxx unknown --- */
#ifdef WARNINGS
#define WARNINGLEVEL WARNINGS
#else
#ifdef NOWARNINGS
#define WARNINGLEVEL 0
#else
#define WARNINGLEVEL 1
#endif
#endif
GLOBAL(int,warninglevel,WARNINGLEVEL); /* warning level */
/* -------------------------------------------------------------------------
control flags and values
-------------------------------------------------------------------------- */
GLOBAL(int,recurlevel,0); /* inc/decremented in rasterize() */
GLOBAL(int,scriptlevel,0); /* inc/decremented in rastlimits() */
GLOBAL(int,isstring,0); /*pixmap is ascii string, not raster*/
/*SHARED(int,imageformat,1);*/ /* image is 1=bitmap, 2=.gf-like */
GLOBAL(int,isdisplaystyle,1); /* displaystyle mode (forced if 2) */
GLOBAL(int,ispreambledollars,0); /* displaystyle mode set by $$...$$ */
GLOBAL(int,fontnum,0); /* cal=1,scr=2,rm=3,it=4,bb=5,bf=6 */
GLOBAL(int,fontsize,NORMALSIZE); /* current size */
GLOBAL(int,displaysize,DISPLAYSIZE); /* use \displaystyle when fontsize>=*/
GLOBAL(int,shrinkfactor,3); /* shrinkfactors[fontsize] */
GLOBAL(double,unitlength,1.0); /* #pixels per unit (may be <1.0) */
/*GLOBAL(int,textwidth,TEXTWIDTH);*/ /* #pixels across line */
GLOBAL(int,iscatspace,1); /* true to add space in rastcat() */
GLOBAL(int,smashmargin,SMASHMARGIN); /* minimum "smash" margin */
GLOBAL(int,issmashdelta,1); /* true if smashmargin is a delta */
GLOBAL(int,blanksignal,(-991234)); /*rastsmash signal right-hand blank*/
GLOBAL(int,istransparent,1); /*true to set background transparent*/
GLOBAL(int,fgred,FGRED);
GLOBAL(int,fggreen,FGGREEN);
GLOBAL(int,fgblue,FGBLUE); /* fg r,g,b */
GLOBAL(int,bgred,BGRED);
GLOBAL(int,bggreen,BGGREEN);
GLOBAL(int,bgblue,BGBLUE); /* bg r,g,b */
GLOBAL(int,isblackonwhite,ISBLACKONWHITE); /*1=black on white,0=reverse*/
GLOBAL(char,exprprefix[256],PREFIX); /* prefix prepended to expressions */
GLOBAL(int,aaalgorithm,AAALGORITHM); /* for lp, 1=aalowpass, 2 =aapnm */
GLOBAL(int,fgalias,1);
GLOBAL(int,fgonly,0);
GLOBAL(int,bgalias,0);
GLOBAL(int,bgonly,0); /* aapnm() params */
GLOBAL(int,issupersampling,ISSUPERSAMPLING); /*1=supersampling 0=lowpass*/
GLOBAL(int,isss,ISSUPERSAMPLING); /* supersampling flag for main() */
GLOBAL(int,*workingparam,(int *)NULL); /* working parameter */
GLOBAL(subraster,*workingbox,(subraster *)NULL); /*working subraster box*/
GLOBAL(int,isreplaceleft,0); /* true to replace leftexpression */
GLOBAL(subraster,*leftexpression,(subraster *)NULL); /*rasterized so far*/
GLOBAL(mathchardef,*leftsymdef,NULL); /* mathchardef for preceding symbol*/
GLOBAL(int,iscaching,ISCACHING); /* true if caching images */
GLOBAL(char,cachepath[256],CACHEPATH); /* relative path to cached files */
GLOBAL(char,pathprefix[256],PATHPREFIX); /*prefix for \input,\counter paths*/
/*GLOBAL(int,iswindows,ISWINDOWS);*/ /* true if compiled for ms windows */
/* -------------------------------------------------------------------------
miscellaneous macros
-------------------------------------------------------------------------- */
#define max2(x,y) ((x)>(y)? (x):(y)) /* larger of 2 arguments */
#define min2(x,y) ((x)<(y)? (x):(y)) /* smaller of 2 arguments */
#define max3(x,y,z) max2(max2(x,y),(z)) /* largest of 3 arguments */
#define min3(x,y,z) min2(min2(x,y),(z)) /* smallest of 3 arguments */
#define absval(x) ((x)>=0?(x):(-(x))) /* absolute value */
#define iround(x) ((int)((x)>=0?(x)+0.5:(x)-0.5)) /* round double to int */
#define dmod(x,y) ((x)-((y)*((double)((int)((x)/(y)))))) /*x%y for doubles*/
#define compress(s,c) if((s)!=NULL) /* remove embedded c's from s */ \
{ char *p; while((p=strchr((s),(c)))!=NULL) strcpy(p,p+1); } else
#define slower(s) if ((s)!=NULL) /* lowercase all chars in s */ \
{ char *p=(s); while(*p!='\000'){*p=tolower(*p); p++;} } else
/* ---
* PART2
* ------ */
#if !defined(PARTS) || defined(PART2)
/* ==========================================================================
* Function: new_raster ( width, height, pixsz )
* Purpose: Allocation and constructor for raster.
* mallocs and initializes memory for width*height pixels,
* and returns raster struct ptr to caller.
* --------------------------------------------------------------------------
* Arguments: width (I) int containing width, in bits,
* of raster pixmap to be allocated
* height (I) int containing height, in bits/scans,
* of raster pixmap to be allocated
* pixsz (I) int containing #bits per pixel, 1 or 8
* --------------------------------------------------------------------------
* Returns: ( raster * ) ptr to allocated and initialized
* raster struct, or NULL for any error.
* --------------------------------------------------------------------------
* Notes:
* ======================================================================= */
/* --- entry point --- */
raster *new_raster ( int width, int height, int pixsz )
{
/* -------------------------------------------------------------------------
Allocations and Declarations
-------------------------------------------------------------------------- */
raster *rp = (raster *)NULL; /* raster ptr returned to caller */
pixbyte *pixmap = NULL; /* raster pixel map to be malloced */
int nbytes = pixsz*bitmapsz(width,height); /* #bytes needed for pixmap */
int filler = (isstring?' ':0); /* pixmap filler */
int delete_raster(); /* in case pixmap malloc() fails */
int npadding = (0&&issupersampling?8+256:0); /* padding bytes */
/* -------------------------------------------------------------------------
allocate and initialize raster struct and embedded bitmap
-------------------------------------------------------------------------- */
if ( msgfp!=NULL && msglevel>=9999 )
{ fprintf(msgfp,"new_raster(%d,%d,%d)> entry point\n",
width,height,pixsz); fflush(msgfp); }
/* --- allocate and initialize raster struct --- */
rp = (raster *)malloc(sizeof(raster)); /* malloc raster struct */
if ( msgfp!=NULL && msglevel>=9999 )
{ fprintf(msgfp,"new_raster> rp=malloc(%d) returned (%s)\n",
sizeof(raster),(rp==NULL?"null ptr":"success")); fflush(msgfp); }
if ( rp == (raster *)NULL ) /* malloc failed */
goto end_of_job; /* return error to caller */
rp->width = width; /* store width in raster struct */
rp->height = height; /* and store height */
rp->format = 1; /* initialize as bitmap format */
rp->pixsz = pixsz; /* store #bits per pixel */
rp->pixmap = (pixbyte *)NULL; /* init bitmap as null ptr */
/* --- allocate and initialize bitmap array --- */
if ( msgfp!=NULL && msglevel>=9999 )
{ fprintf(msgfp,"new_raster> calling pixmap=malloc(%d)\n",
nbytes); fflush(msgfp); }
if ( nbytes>0 && nbytes<=pixsz*maxraster ) /* fail if width*height too big*/
pixmap = (pixbyte *)malloc(nbytes+npadding); /*bytes for width*height bits*/
if ( msgfp!=NULL && msglevel>=9999 )
{ fprintf(msgfp,"new_raster> pixmap=malloc(%d) returned (%s)\n",
nbytes,(pixmap==NULL?"null ptr":"success")); fflush(msgfp); }
if ( pixmap == (pixbyte *)NULL ) /* malloc failed */
{ delete_raster(rp); /* so free everything */
rp = (raster *)NULL; /* reset pointer */
goto end_of_job; } /* and return error to caller */
memset((void *)pixmap,filler,nbytes); /* init bytes to binary 0's or ' 's*/
*pixmap = (pixbyte)0; /* and first byte alwasy 0 */
rp->pixmap = pixmap; /* store ptr to malloced memory */
/* -------------------------------------------------------------------------
Back to caller with address of raster struct, or NULL ptr for any error.
-------------------------------------------------------------------------- */
end_of_job:
if ( msgfp!=NULL && msglevel>=9999 )
{ fprintf(msgfp,"new_raster(%d,%d,%d)> returning (%s)\n",
width,height,pixsz,(rp==NULL?"null ptr":"success")); fflush(msgfp); }
return ( rp ); /* back to caller with raster */
} /* --- end-of-function new_raster() --- */
/* ==========================================================================
* Function: new_subraster ( width, height, pixsz )
* Purpose: Allocate a new subraster along with
* an embedded raster of width x height.
* --------------------------------------------------------------------------
* Arguments: width (I) int containing width of embedded raster
* height (I) int containing height of embedded raster
* pixsz (I) int containing #bits per pixel, 1 or 8
* --------------------------------------------------------------------------
* Returns: ( subraster * ) ptr to newly-allocated subraster,
* or NULL for any error.
* --------------------------------------------------------------------------
* Notes: o if width or height <=0, embedded raster not allocated
* ======================================================================= */
/* --- entry point --- */
subraster *new_subraster ( int width, int height, int pixsz )
{
/* -------------------------------------------------------------------------
Allocations and Declarations
-------------------------------------------------------------------------- */
subraster *sp=NULL; /* subraster returned to caller */
raster *new_raster(), *rp=NULL; /* image raster embedded in sp */
int delete_subraster(); /* in case new_raster() fails */
int size = NORMALSIZE, /* default size */
baseline = height-1; /* and baseline */
/* -------------------------------------------------------------------------
allocate and initialize subraster struct
-------------------------------------------------------------------------- */
if ( msgfp!=NULL && msglevel>=9999 )
{ fprintf(msgfp,"new_subraster(%d,%d,%d)> entry point\n",
width,height,pixsz); fflush(msgfp); }
/* --- allocate subraster struct --- */
sp = (subraster *)malloc(sizeof(subraster)); /* malloc subraster struct */
if ( sp == (subraster *)NULL ) /* malloc failed */
goto end_of_job; /* return error to caller */
/* --- initialize subraster struct --- */
sp->type = NOVALUE; /* character or image raster */
sp->symdef = (mathchardef *)NULL; /* mathchardef identifying image */
sp->baseline = baseline; /*0 if image is entirely descending*/
sp->size = size; /* font size 0-4 */
sp->toprow = sp->leftcol = (-1); /* upper-left corner of subraster */
sp->image = (raster *)NULL; /*ptr to bitmap image of subraster*/
/* -------------------------------------------------------------------------
allocate raster and embed it in subraster, and return to caller
-------------------------------------------------------------------------- */
/* --- allocate raster struct if desired --- */
if ( width>0 && height>0 && pixsz>0 ) /* caller wants raster */
{ if ( (rp=new_raster(width,height,pixsz)) /* allocate embedded raster */
!= NULL ) /* if allocate succeeded */
sp->image = rp; /* embed raster in subraster */
else /* or if allocate failed */
{ delete_subraster(sp); /* free non-unneeded subraster */
sp = NULL; } } /* signal error */
/* --- back to caller with new subraster or NULL --- */
end_of_job:
if ( msgfp!=NULL && msglevel>=9999 )
{ fprintf(msgfp,"new_subraster(%d,%d,%d)> returning (%s)\n",
width,height,pixsz,(sp==NULL?"null ptr":"success")); fflush(msgfp); }
return ( sp );
} /* --- end-of-function new_subraster() --- */
/* ==========================================================================
* Function: new_chardef ( )
* Purpose: Allocates and initializes a chardef struct,
* but _not_ the embedded raster struct.
* --------------------------------------------------------------------------
* Arguments: none
* --------------------------------------------------------------------------
* Returns: ( chardef * ) ptr to allocated and initialized
* chardef struct, or NULL for any error.
* --------------------------------------------------------------------------
* Notes:
* ======================================================================= */
/* --- entry point --- */
chardef *new_chardef ( )
{
/* -------------------------------------------------------------------------
Allocations and Declarations
-------------------------------------------------------------------------- */
chardef *cp = (chardef *)NULL; /* chardef ptr returned to caller */
/* -------------------------------------------------------------------------
allocate and initialize chardef struct
-------------------------------------------------------------------------- */
cp = (chardef *)malloc(sizeof(chardef)); /* malloc chardef struct */
if ( cp == (chardef *)NULL ) /* malloc failed */
goto end_of_job; /* return error to caller */
cp->charnum = cp->location = 0; /* init character description */
cp->toprow = cp->topleftcol = 0; /* init upper-left corner */
cp->botrow = cp->botleftcol = 0; /* init lower-left corner */
cp->image.width = cp->image.height = 0; /* init raster dimensions */
cp->image.format = 0; /* init raster format */
cp->image.pixsz = 0; /* and #bits per pixel */
cp->image.pixmap = NULL; /* init raster pixmap as null */
/* -------------------------------------------------------------------------
Back to caller with address of chardef struct, or NULL ptr for any error.
-------------------------------------------------------------------------- */
end_of_job:
return ( cp );
} /* --- end-of-function new_chardef() --- */
/* ==========================================================================
* Function: delete_raster ( rp )
* Purpose: Destructor for raster.
* Frees memory for raster bitmap and struct.
* --------------------------------------------------------------------------
* Arguments: rp (I) ptr to raster struct to be deleted.
* --------------------------------------------------------------------------
* Returns: ( int ) 1 if completed successfully,
* or 0 otherwise (for any error).
* --------------------------------------------------------------------------
* Notes:
* ======================================================================= */
/* --- entry point --- */
int delete_raster ( raster *rp )
{
/* -------------------------------------------------------------------------
free raster bitmap and struct
-------------------------------------------------------------------------- */
if ( rp != (raster *)NULL ) /* can't free null ptr */
{
if ( rp->pixmap != (pixbyte *)NULL ) /* can't free null ptr */
free((void *)rp->pixmap); /* free pixmap within raster */
free((void *)rp); /* lastly, free raster struct */
} /* --- end-of-if(rp!=NULL) --- */
return ( 1 ); /* back to caller, 1=okay 0=failed */
} /* --- end-of-function delete_raster() --- */
/* ==========================================================================
* Function: delete_subraster ( sp )
* Purpose: Deallocates a subraster (and embedded raster)
* --------------------------------------------------------------------------
* Arguments: sp (I) ptr to subraster struct to be deleted.
* --------------------------------------------------------------------------
* Returns: ( int ) 1 if completed successfully,
* or 0 otherwise (for any error).
* --------------------------------------------------------------------------
* Notes:
* ======================================================================= */
/* --- entry point --- */
int delete_subraster ( subraster *sp )
{
/* -------------------------------------------------------------------------
free subraster struct
-------------------------------------------------------------------------- */
int delete_raster(); /* to delete embedded raster */
if ( sp != (subraster *)NULL ) /* can't free null ptr */
{
if ( sp->type != CHARASTER ) /* not static character data */
if ( sp->image != NULL ) /*raster allocated within subraster*/
delete_raster(sp->image); /* so free embedded raster */
free((void *)sp); /* and free subraster struct itself*/
} /* --- end-of-if(sp!=NULL) --- */
return ( 1 ); /* back to caller, 1=okay 0=failed */
} /* --- end-of-function delete_subraster() --- */
/* ==========================================================================
* Function: delete_chardef ( cp )
* Purpose: Deallocates a chardef (and bitmap of embedded raster)
* --------------------------------------------------------------------------
* Arguments: cp (I) ptr to chardef struct to be deleted.
* --------------------------------------------------------------------------
* Returns: ( int ) 1 if completed successfully,
* or 0 otherwise (for any error).
* --------------------------------------------------------------------------
* Notes:
* ======================================================================= */
/* --- entry point --- */
int delete_chardef ( chardef *cp )
{
/* -------------------------------------------------------------------------
free chardef struct
-------------------------------------------------------------------------- */
if ( cp != (chardef *)NULL ) /* can't free null ptr */
{
if ( cp->image.pixmap != NULL ) /* pixmap allocated within raster */
free((void *)cp->image.pixmap); /* so free embedded pixmap */
free((void *)cp); /* and free chardef struct itself */
} /* --- end-of-if(cp!=NULL) --- */
/* -------------------------------------------------------------------------
Back to caller with 1=okay, 0=failed.
-------------------------------------------------------------------------- */
return ( 1 );
} /* --- end-of-function delete_chardef() --- */
/* ==========================================================================
* Function: rastcpy ( rp )
* Purpose: makes duplicate copy of rp
* --------------------------------------------------------------------------
* Arguments: rp (I) ptr to raster struct to be copied
* --------------------------------------------------------------------------
* Returns: ( raster * ) ptr to new copy rp,
* or NULL for any error.
* --------------------------------------------------------------------------
* Notes: o
* ======================================================================= */
/* --- entry point --- */
raster *rastcpy ( raster *rp )
{
/* -------------------------------------------------------------------------
Allocations and Declarations
-------------------------------------------------------------------------- */
raster *new_raster(), *newrp=NULL; /*copied raster returned to caller*/
int height= (rp==NULL?0:rp->height), /* original and copied height */
width = (rp==NULL?0:rp->width), /* original and copied width */
pixsz = (rp==NULL?0:rp->pixsz), /* #bits per pixel */
nbytes= (rp==NULL?0:(pixmapsz(rp))); /* #bytes in rp's pixmap */
/* -------------------------------------------------------------------------
allocate rotated raster and fill it
-------------------------------------------------------------------------- */
/* --- allocate copied raster with same width,height, and copy bitmap --- */
if ( rp != NULL ) /* nothing to copy if ptr null */
if ( (newrp = new_raster(width,height,pixsz)) /*same width,height in copy*/
!= NULL ) /* check that allocate succeeded */
memcpy(newrp->pixmap,rp->pixmap,nbytes); /* fill copied raster pixmap */
return ( newrp ); /* return copied raster to caller */
} /* --- end-of-function rastcpy() --- */
/* ==========================================================================
* Function: subrastcpy ( sp )
* Purpose: makes duplicate copy of sp
* --------------------------------------------------------------------------
* Arguments: sp (I) ptr to subraster struct to be copied
* --------------------------------------------------------------------------
* Returns: ( subraster * ) ptr to new copy sp,
* or NULL for any error.
* --------------------------------------------------------------------------
* Notes: o
* ======================================================================= */
/* --- entry point --- */
subraster *subrastcpy ( subraster *sp )
{
/* -------------------------------------------------------------------------
Allocations and Declarations
-------------------------------------------------------------------------- */
subraster *new_subraster(), *newsp=NULL; /* allocate new subraster */
raster *rastcpy(), *newrp=NULL; /* and new raster image within it */
int delete_subraster(); /* dealloc newsp if rastcpy() fails*/
/* -------------------------------------------------------------------------
make copy, and return it to caller
-------------------------------------------------------------------------- */
if ( sp == NULL ) goto end_of_job; /* nothing to copy */
/* --- allocate new subraster "envelope" for copy --- */
if ( (newsp=new_subraster(0,0,0)) /* allocate subraster "envelope" */
== NULL ) goto end_of_job; /* and quit if we fail to allocate */
/* --- transparently copy original envelope to new one --- */
memcpy((void *)newsp,(void *)sp,sizeof(subraster)); /* copy envelope */
/* --- make a copy of the rasterized image itself, if there is one --- */
if ( sp->image != NULL ) /* there's an image embedded in sp */
if ( (newrp = rastcpy(sp->image)) /* so copy rasterized image in sp */
== NULL ) /* failed to copy successfully */
{ delete_subraster(newsp); /* won't need newsp any more */
newsp = NULL; /* because we're returning error */
goto end_of_job; } /* back to caller with error signal*/
/* --- set new params in new envelope --- */
newsp->image = newrp; /* new raster image we just copied */
switch ( sp->type ) /* set new raster image type */
{ case STRINGRASTER: case CHARASTER: newsp->type = STRINGRASTER; break;
case ASCIISTRING: newsp->type = ASCIISTRING; break;
case IMAGERASTER: default: newsp->type = IMAGERASTER; break; }
/* --- return copy of sp to caller --- */
end_of_job:
return ( newsp ); /* copy back to caller */
} /* --- end-of-function subrastcpy() --- */
/* ==========================================================================
* Function: rastrot ( rp )
* Purpose: rotates rp image 90 degrees right/clockwise
* --------------------------------------------------------------------------
* Arguments: rp (I) ptr to raster struct to be rotated
* --------------------------------------------------------------------------
* Returns: ( raster * ) ptr to new raster rotated ralative to rp,
* or NULL for any error.
* --------------------------------------------------------------------------
* Notes: o An underbrace is } rotated 90 degrees clockwise,
* a hat is <, etc.
* ======================================================================= */
/* --- entry point --- */
raster *rastrot ( raster *rp )
{
/* -------------------------------------------------------------------------
Allocations and Declarations
-------------------------------------------------------------------------- */
raster *new_raster(), *rotated=NULL; /*rotated raster returned to caller*/
int height = rp->height, irow, /* original height, row index */
width = rp->width, icol, /* original width, column index */
pixsz = rp->pixsz; /* #bits per pixel */
/* -------------------------------------------------------------------------
allocate rotated raster and fill it
-------------------------------------------------------------------------- */
/* --- allocate rotated raster with flipped width<-->height --- */
if ( (rotated = new_raster(height,width,pixsz)) /* flip width,height */
!= NULL ) /* check that allocation succeeded */
/* --- fill rotated raster --- */
for ( irow=0; irow<height; irow++ ) /* for each row of rp */
for ( icol=0; icol<width; icol++ ) /* and each column of rp */
{ int value = getpixel(rp,irow,icol);
/* setpixel(rotated,icol,irow,value); } */
setpixel(rotated,icol,(height-1-irow),value); }
return ( rotated ); /* return rotated raster to caller */
} /* --- end-of-function rastrot() --- */
/* ==========================================================================
* Function: rastput ( target, source, top, left, isopaque )
* Purpose: Overlays source onto target,
* with the 0,0-bit of source onto the top,left-bit of target.
* --------------------------------------------------------------------------
* Arguments: target (I) ptr to target raster struct
* source (I) ptr to source raster struct
* top (I) int containing 0 ... target->height - 1
* left (I) int containing 0 ... target->width - 1
* isopaque (I) int containing false (zero) to allow
* original 1-bits of target to "show through"
* 0-bits of source.
* --------------------------------------------------------------------------
* Returns: ( int ) 1 if completed successfully,
* or 0 otherwise (for any error).
* --------------------------------------------------------------------------
* Notes:
* ======================================================================= */
/* --- entry point --- */
int rastput ( raster *target, raster *source,
int top, int left, int isopaque )
{
/* -------------------------------------------------------------------------
Allocations and Declarations
-------------------------------------------------------------------------- */
int irow, icol, /* indexes over source raster */
twidth=target->width, theight=target->height, /*target width,height*/
tpix, ntpix = twidth*theight; /* #pixels in target */
int isfatal = 0, /* true to abend on out-of-bounds error */
isstrict = 0/*1*/, /* true for strict bounds check - no "wrap"*/
isokay = 1; /* true if no pixels out-of-bounds */
/* -------------------------------------------------------------------------
superimpose source onto target, one bit at a time
-------------------------------------------------------------------------- */
if ( isstrict && (top<0 || left<0) ) /* args fail strict test */
isokay = 0; /* so just return error */
else
for ( irow=0; irow<source->height; irow++ ) /* for each scan line */
{
tpix = (top+irow)*target->width + left - 1; /*first target pixel (-1)*/
for ( icol=0; icol<source->width; icol++ ) /* each pixel in scan line */
{
int svalue = getpixel(source,irow,icol); /* source pixel value */
++tpix; /* bump target pixel */
if ( msgfp!=NULL && msglevel>=9999 ) /* debugging output */
{ fprintf(msgfp,"rastput> tpix,ntpix=%d,%d top,irow,theight=%d,%d,%d "
"left,icol,twidth=%d,%d,%d\n", tpix,ntpix, top,irow,theight,
left,icol,twidth); fflush(msgfp); }
if ( tpix >= ntpix /* bounds check failed */
|| (isstrict && (irow+top>=theight || icol+left>=twidth)) )
{ isokay = 0; /* reset okay flag */
if ( isfatal ) goto end_of_job; /* abort if error is fatal */
else break; } /*or just go on to next row*/
if ( tpix >= 0 ) /* bounds check okay */
if ( svalue!=0 || isopaque ) /*got dark or opaque source*/
setpixel(target,irow+top,icol+left,svalue); /*overlay source on target*/
} /* --- end-of-for(icol) --- */
} /* --- end-of-for(irow) --- */
/* -------------------------------------------------------------------------
Back to caller with 1=okay, 0=failed.
-------------------------------------------------------------------------- */
end_of_job:
return ( isokay /*isfatal? (tpix<ntpix? 1:0) : 1*/ );
} /* --- end-of-function rastput() --- */
/* ==========================================================================
* Function: rastcompose ( sp1, sp2, offset2, isalign, isfree )
* Purpose: Overlays sp2 on top of sp1, leaving both unchanged
* and returning a newly-allocated composite subraster.
* Frees/deletes input sp1 and/or sp2 depending on value
* of isfree (0=none, 1=sp1, 2=sp2, 3=both).
* --------------------------------------------------------------------------
* Arguments: sp1 (I) subraster * to "underneath" subraster,
* whose baseline is preserved
* sp2 (I) subraster * to "overlaid" subraster
* offset2 (I) int containing 0 or number of pixels
* to horizontally shift sp2 relative to sp1,
* either positive (right) or negative
* isalign (I) int containing 1 to align baselines,
* or 0 to vertically center sp2 over sp1
* isfree (I) int containing 1=free sp1 before return,
* 2=free sp2, 3=free both, 0=free none.
* --------------------------------------------------------------------------
* Returns: ( subraster * ) pointer to constructed subraster
* or NULL for any error
* --------------------------------------------------------------------------
* Notes:
* ======================================================================= */
/* --- entry point --- */
subraster *rastcompose ( subraster *sp1, subraster *sp2, int offset2,
int isalign, int isfree )
{
/* -------------------------------------------------------------------------
Allocations and Declarations
-------------------------------------------------------------------------- */
subraster *new_subraster(), *sp=(subraster *)NULL; /* returned subraster */
raster *rp=(raster *)NULL; /* new composite raster in sp */
int delete_subraster(); /* in case isfree non-zero */
int rastput(); /*place sp1,sp2 in composite raster*/
int base1 = sp1->baseline, /*baseline for underlying subraster*/
height1 = (sp1->image)->height, /* height for underlying subraster */
width1 = (sp1->image)->width, /* width for underlying subraster */
pixsz1 = (sp1->image)->pixsz, /* pixsz for underlying subraster */
base2 = sp2->baseline, /*baseline for overlaid subraster */
height2 = (sp2->image)->height, /* height for overlaid subraster */
width2 = (sp2->image)->width, /* width for overlaid subraster */
pixsz2 = (sp2->image)->pixsz; /* pixsz for overlaid subraster */
int height=0, width=0, pixsz=0, base=0; /* overlaid composite */
/* -------------------------------------------------------------------------
Initialization
-------------------------------------------------------------------------- */
/* --- determine height, width and baseline of composite raster --- */
if ( isalign ) /* baselines of sp1,sp2 aligned */
{ height = max2(base1+1,base2+1) /* max height above baseline */
+ max2(height1-base1-1,height2-base2-1); /*+ max descending below*/
base = max2(base1,base2); } /* max space above baseline */
else /* baselines not aligned */
{ height = max2(height1,height2); /* max height */
base = base1 + (height-height1)/2; } /* baseline for sp1 */
width = max2(width1,width2+abs(offset2)); /* max width */
pixsz = max2(pixsz1,pixsz2); /* bitmap,bytemap becomes bytemap */
/* -------------------------------------------------------------------------
allocate concatted composite subraster
-------------------------------------------------------------------------- */
/* --- allocate returned subraster (and then initialize it) --- */
if ( (sp=new_subraster(width,height,pixsz)) /* allocate new subraster */
== (subraster *)NULL ) goto end_of_job; /* failed, so quit */
/* --- initialize subraster parameters --- */
sp->type = IMAGERASTER; /* image */
sp->baseline = base; /* composite baseline */
sp->size = sp1->size; /* underlying char is sp1 */
/* --- extract raster from subraster --- */
rp = sp->image; /* raster allocated in subraster */
/* -------------------------------------------------------------------------
overlay sp1 and sp2 in new composite raster
-------------------------------------------------------------------------- */
if ( isalign )
{ rastput (rp, sp1->image, base-base1, (width-width1)/2, 1); /*underlying*/
rastput (rp, sp2->image, base-base2, /*overlaid*/
(width-width2)/2+offset2, 0); }
else
{ rastput (rp, sp1->image, base-base1, (width-width1)/2, 1); /*underlying*/
rastput (rp, sp2->image, (height-height2)/2, /*overlaid*/
(width-width2)/2+offset2, 0); }
/* -------------------------------------------------------------------------
free input if requested
-------------------------------------------------------------------------- */
if ( isfree > 0 ) /* caller wants input freed */
{ if ( isfree==1 || isfree>2 ) delete_subraster(sp1); /* free sp1 */
if ( isfree >= 2 ) delete_subraster(sp2); } /* and/or sp2 */
/* -------------------------------------------------------------------------
Back to caller with pointer to concatted subraster or with null for error
-------------------------------------------------------------------------- */
end_of_job:
return ( sp ); /* back with subraster or null ptr */
} /* --- end-of-function rastcompose() --- */
/* ==========================================================================
* Function: rastcat ( sp1, sp2, isfree )
* Purpose: "Concatanates" subrasters sp1||sp2, leaving both unchanged
* and returning a newly-allocated subraster.
* Frees/deletes input sp1 and/or sp2 depending on value
* of isfree (0=none, 1=sp1, 2=sp2, 3=both).
* --------------------------------------------------------------------------
* Arguments: sp1 (I) subraster * to left-hand subraster
* sp2 (I) subraster * to right-hand subraster
* isfree (I) int containing 1=free sp1 before return,
* 2=free sp2, 3=free both, 0=free none.
* --------------------------------------------------------------------------
* Returns: ( subraster * ) pointer to constructed subraster sp1||sp2
* or NULL for any error
* --------------------------------------------------------------------------
* Notes:
* ======================================================================= */
/* --- entry point --- */
subraster *rastcat ( subraster *sp1, subraster *sp2, int isfree )
{
/* -------------------------------------------------------------------------
Allocations and Declarations
-------------------------------------------------------------------------- */
subraster *new_subraster(), *sp=(subraster *)NULL; /* returned subraster */
raster *rp=(raster *)NULL; /* new concatted raster */
int delete_subraster(); /* in case isfree non-zero */
int rastput(); /*place sp1,sp2 in concatted raster*/
int type_raster(); /* debugging display */
int base1 = sp1->baseline, /*baseline for left-hand subraster*/
height1 = (sp1->image)->height, /* height for left-hand subraster */
width1 = (sp1->image)->width, /* width for left-hand subraster */
pixsz1 = (sp1->image)->pixsz, /* pixsz for left-hand subraster */
type1 = sp1->type, /* image type for left-hand */
base2 = sp2->baseline, /*baseline for right-hand subraster*/
height2 = (sp2->image)->height, /* height for right-hand subraster */
width2 = (sp2->image)->width, /* width for right-hand subraster */
pixsz2 = (sp2->image)->pixsz, /* pixsz for right-hand subraster */
type2 = sp2->type; /* image type for right-hand */
int height=0, width=0, pixsz=0, base=0; /*concatted sp1||sp2 composite*/
int issmash = (smashmargin!=0?1:0), /* true to "squash" sp1||sp2 */
isopaque = (issmash?0:1), /* not oppaque if smashing */
rastsmash(), isblank=0, nsmash=0, /* #cols to smash */
oldsmashmargin = smashmargin; /* save original smashmargin */
mathchardef *symdef1 = sp1->symdef, /*mathchardef of last left-hand char*/
*symdef2 = sp2->symdef; /* mathchardef of right-hand char */
int class1 = (symdef1==NULL?ORDINARY:symdef1->class), /* symdef->class */
class2 = (symdef2==NULL?ORDINARY:symdef2->class), /* or default */
smash1 = (symdef1!=NULL)&&(class1==ORDINARY||class1==VARIABLE||
class1==OPENING||class1==CLOSING||class1==PUNCTION),
smash2 = (symdef2!=NULL)&&(class2==ORDINARY||class2==VARIABLE||
class2==OPENING||class2==CLOSING||class2==PUNCTION),
space = fontsize/2+1; /* #cols between sp1 and sp2 */
/* -------------------------------------------------------------------------
Initialization
-------------------------------------------------------------------------- */
/* --- determine inter-character space from character class --- */
if ( !isstring )
space = max2(2,(symspace[class1][class2] + fontsize-3)); /* space */
else space = 1; /* space for ascii string */
if ( !iscatspace ) space=0; /* spacing explicitly turned off */
/* --- determine smash --- */
if ( !isstring ) /* don't smash strings */
if ( issmash ) { /* raster smash wanted */
int maxsmash = rastsmash(sp1,sp2), /* calculate max smash space */
margin = smashmargin; /* init margin without delta */
if ( (1 && smash1 && smash2) /* concatanating two chars */
|| (1 && type1!=IMAGERASTER && type2!=IMAGERASTER) )
/*maxsmash = 0;*/ /* turn off smash */
margin = max2(space-1,0); /* force small smashmargin */
else /* adjust for delta if images */
if ( issmashdelta ) /* smashmargin is a delta value */
margin += fontsize; /* add displaystyle base to margin */
if ( maxsmash == blanksignal ) /* sp2 is intentional blank */
isblank = 1; /* set blank flag signal */
else /* see how much extra space we have*/
if ( maxsmash > margin ) /* enough space for adjustment */
nsmash = maxsmash-margin; /* make adjustment */
if ( msgfp!=NULL && msglevel>=99 ) /* display smash results */
{ fprintf(msgfp,"rastcat> maxsmash=%d, margin=%d, nsmash=%d\n",
maxsmash,margin,nsmash);
fprintf(msgfp,"rastcat> type1=%d,2=%d, class1=%d,2=%d\n", type1,type2,
(symdef1==NULL?-999:class1),(symdef2==NULL?-999:class2));
fflush(msgfp); }
} /* --- end-of-if(issmash) --- */
/* --- determine height, width and baseline of composite raster --- */
if ( !isstring )
{ height = max2(base1+1,base2+1) /* max height above baseline */
+ max2(height1-base1-1,height2-base2-1); /*+ max descending below*/
width = width1+width2 + space-nsmash; /*add widths and space-smash*/
width = max3(width,width1,width2); } /* don't "over-smash" composite */
else /* ascii string */
{ height = 1; /* default */
width = width1 + width2 + space - 1; } /* no need for two nulls */
pixsz = max2(pixsz1,pixsz2); /* bitmap||bytemap becomes bytemap */
base = max2(base1,base2); /* max space above baseline */
if ( msgfp!=NULL && msglevel>=9999 ) /* display components */
{ fprintf(msgfp,"rastcat> Left-hand ht,width,pixsz,base = %d,%d,%d,%d\n",
height1,width1,pixsz1,base1);
type_raster(sp1->image,msgfp); /* display left-hand raster */
fprintf(msgfp,"rastcat> Right-hand ht,width,pixsz,base = %d,%d,%d,%d\n",
height2,width2,pixsz2,base2);
type_raster(sp2->image,msgfp); /* display right-hand raster */
fprintf(msgfp,
"rastcat> Composite ht,width,smash,pixsz,base = %d,%d,%d,%d,%d\n",
height,width,nsmash,pixsz,base);
fflush(msgfp); } /* flush msgfp buffer */
/* -------------------------------------------------------------------------
allocate concatted composite subraster
-------------------------------------------------------------------------- */
/* --- allocate returned subraster (and then initialize it) --- */
if ( msgfp!=NULL && msglevel>=9999 )
{ fprintf(msgfp,"rastcat> calling new_subraster(%d,%d,%d)\n",
width,height,pixsz); fflush(msgfp); }
if ( (sp=new_subraster(width,height,pixsz)) /* allocate new subraster */
== (subraster *)NULL ) /* failed */
{ if ( msgfp!=NULL && msglevel>=1 ) /* report failure */
{ fprintf(msgfp,"rastcat> new_subraster(%d,%d,%d) failed\n",
width,height,pixsz); fflush(msgfp); }
goto end_of_job; } /* failed, so quit */
/* --- initialize subraster parameters --- */
/* sp->type = (!isstring?STRINGRASTER:ASCIISTRING); */ /*concatted string*/
if ( !isstring )
sp->type = /*type2;*//*(type1==type2?type2:IMAGERASTER);*/
(type2!=CHARASTER? type2 : (type1!=CHARASTER?type1:STRINGRASTER));
else
sp->type = ASCIISTRING; /* concatted ascii string */
sp->symdef = symdef2; /* rightmost char is sp2 */
sp->baseline = base; /* composite baseline */
sp->size = sp2->size; /* rightmost char is sp2 */
if ( isblank ) /* need to propagate blanksignal */
sp->type = blanksignal; /* may not be completely safe??? */
/* --- extract raster from subraster --- */
rp = sp->image; /* raster allocated in subraster */
/* -------------------------------------------------------------------------
overlay sp1 and sp2 in new composite raster
-------------------------------------------------------------------------- */
if ( msgfp!=NULL && msglevel>=9999 )
{ fprintf(msgfp,"rastcat> calling rastput() to concatanate left||right\n");
fflush(msgfp); } /* flush msgfp buffer */
if ( !isstring )
rastput (rp, sp1->image, base-base1, /* overlay left-hand */
max2(0,nsmash-width1), 1); /* plus any residual smash space */
else
memcpy(rp->pixmap,(sp1->image)->pixmap,width1-1); /*init left string*/
if ( msgfp!=NULL && msglevel>=9999 )
{ type_raster(sp->image,msgfp); /* display composite raster */
fflush(msgfp); } /* flush msgfp buffer */
if ( !isstring )
rastput (rp, sp2->image, base-base2, /* overlay right-hand */
max2(0,width1+space-nsmash), isopaque); /* minus any smashed space */
else
{ strcpy((char *)(rp->pixmap)+width1-1+space,(char *)((sp2->image)->pixmap));
((char *)(rp->pixmap))[width1+width2+space-2] = '\000'; } /*null-term*/
if ( msgfp!=NULL && msglevel>=9999 )
{ type_raster(sp->image,msgfp); /* display composite raster */
fflush(msgfp); } /* flush msgfp buffer */
/* -------------------------------------------------------------------------
free input if requested
-------------------------------------------------------------------------- */
if ( isfree > 0 ) /* caller wants input freed */
{ if ( isfree==1 || isfree>2 ) delete_subraster(sp1); /* free sp1 */
if ( isfree >= 2 ) delete_subraster(sp2); } /* and/or sp2 */
/* -------------------------------------------------------------------------
Back to caller with pointer to concatted subraster or with null for error
-------------------------------------------------------------------------- */
end_of_job:
smashmargin = oldsmashmargin; /* reset original smashmargin */
return ( sp ); /* back with subraster or null ptr */
} /* --- end-of-function rastcat() --- */
/* ==========================================================================
* Function: rastack ( sp1, sp2, base, space, iscenter, isfree )
* Purpose: Stack subrasters sp2 atop sp1, leaving both unchanged
* and returning a newly-allocated subraster,
* whose baseline is sp1's if base=1, or sp2's if base=2.
* Frees/deletes input sp1 and/or sp2 depending on value
* of isfree (0=none, 1=sp1, 2=sp2, 3=both).
* --------------------------------------------------------------------------
* Arguments: sp1 (I) subraster * to lower subraster
* sp2 (I) subraster * to upper subraster
* base (I) int containing 1 if sp1 is baseline,
* or 2 if sp2 is baseline.
* space (I) int containing #rows blank space inserted
* between sp1's image and sp2's image.
* iscenter (I) int containing 1 to center both sp1 and sp2
* in stacked array, 0 to left-justify both
* isfree (I) int containing 1=free sp1 before return,
* 2=free sp2, 3=free both, 0=free none.
* --------------------------------------------------------------------------
* Returns: ( subraster * ) pointer to constructed subraster sp2 atop sp1
* or NULL for any error
* --------------------------------------------------------------------------
* Notes:
* ======================================================================= */
/* --- entry point --- */
subraster *rastack ( subraster *sp1, subraster *sp2,
int base, int space, int iscenter, int isfree )
{
/* -------------------------------------------------------------------------
Allocations and Declarations
-------------------------------------------------------------------------- */
subraster *new_subraster(), *sp=(subraster *)NULL; /* returned subraster */
raster *rp=(raster *)NULL; /* new stacked raster in sp */
int delete_subraster(); /* in case isfree non-zero */
int rastput(); /* place sp1,sp2 in stacked raster */
int base1 = sp1->baseline, /* baseline for lower subraster */
height1 = (sp1->image)->height, /* height for lower subraster */
width1 = (sp1->image)->width, /* width for lower subraster */
pixsz1 = (sp1->image)->pixsz, /* pixsz for lower subraster */
base2 = sp2->baseline, /* baseline for upper subraster */
height2 = (sp2->image)->height, /* height for upper subraster */
width2 = (sp2->image)->width, /* width for upper subraster */
pixsz2 = (sp2->image)->pixsz; /* pixsz for upper subraster */
int height=0, width=0, pixsz=0, baseline=0; /*for stacked sp2 atop sp1*/
mathchardef *symdef1 = sp1->symdef, /* mathchardef of right lower char */
*symdef2 = sp2->symdef; /* mathchardef of right upper char */
/* -------------------------------------------------------------------------
Initialization
-------------------------------------------------------------------------- */
/* --- determine height, width and baseline of composite raster --- */
height = height1 + space + height2; /* sum of heights plus space */
width = max2(width1,width2); /* max width is overall width */
pixsz = max2(pixsz1,pixsz2); /* bitmap||bytemap becomes bytemap */
baseline = (base==1? height2+space+base1 : (base==2? base2 : 0));
/* -------------------------------------------------------------------------
allocate stacked composite subraster (with embedded raster)
-------------------------------------------------------------------------- */
/* --- allocate returned subraster (and then initialize it) --- */
if ( (sp=new_subraster(width,height,pixsz)) /* allocate new subraster */
== (subraster *)NULL ) goto end_of_job; /* failed, so quit */
/* --- initialize subraster parameters --- */
sp->type = IMAGERASTER; /* stacked rasters */
sp->symdef = (base==1? symdef1 : (base==2? symdef2 : NULL)); /* symdef */
sp->baseline = baseline; /* composite baseline */
sp->size = (base==1? sp1->size : (base==2? sp2->size : NORMALSIZE)); /*size*/
/* --- extract raster from subraster --- */
rp = sp->image; /* raster embedded in subraster */
/* -------------------------------------------------------------------------
overlay sp1 and sp2 in new composite raster
-------------------------------------------------------------------------- */
if ( iscenter == 1 ) /* center both sp1 and sp2 */
{ rastput (rp, sp2->image, 0, (width-width2)/2, 1); /* overlay upper */
rastput (rp, sp1->image, height2+space, (width-width1)/2, 1); } /*lower*/
else /* left-justify both sp1 and sp2 */
{ rastput (rp, sp2->image, 0, 0, 1); /* overlay upper */
rastput (rp, sp1->image, height2+space, 0, 1); } /*lower*/
/* -------------------------------------------------------------------------
free input if requested
-------------------------------------------------------------------------- */
if ( isfree > 0 ) /* caller wants input freed */
{ if ( isfree==1 || isfree>2 ) delete_subraster(sp1); /* free sp1 */
if ( isfree>=2 ) delete_subraster(sp2); } /* and/or sp2 */
/* -------------------------------------------------------------------------
Back to caller with pointer to stacked subraster or with null for error
-------------------------------------------------------------------------- */
end_of_job:
return ( sp ); /* back with subraster or null ptr */
} /* --- end-of-function rastack() --- */
/* ==========================================================================
* Function: rastile ( tiles, ntiles )
* Purpose: Allocate and build up a composite raster
* from the ntiles components/characters supplied in tiles.
* --------------------------------------------------------------------------
* Arguments: tiles (I) subraster * to array of subraster structs
* describing the components and their locations
* ntiles (I) int containing number of subrasters in tiles[]
* --------------------------------------------------------------------------
* Returns: ( raster * ) ptr to composite raster,
* or NULL for any error.
* --------------------------------------------------------------------------
* Notes: o The top,left corner of a raster is row=0,col=0
* with row# increasing as you move down,
* and col# increasing as you move right.
* Metafont numbers rows with the baseline=0,
* so the top row is a positive number that
* decreases as you move down.
* o rastile() is no longer used.
* It was used by an earlier rasterize() algorithm,
* and I've left it in place should it be needed again.
* But recent changes haven't been tested/exercised.
* ======================================================================= */
/* --- entry point --- */
raster *rastile ( subraster *tiles, int ntiles )
{
/* -------------------------------------------------------------------------
Allocations and Declarations
-------------------------------------------------------------------------- */
raster *new_raster(), *composite=(raster *)NULL; /*raster back to caller*/
int width=0, height=0, pixsz=0, /*width,height,pixsz of composite raster*/
toprow=9999, rightcol=-999, /* extreme upper-right corner of tiles */
botrow=-999, leftcol=9999; /* extreme lower-left corner of tiles */
int itile; /* tiles[] index */
int rastput(); /* overlay each tile in composite raster */
/* -------------------------------------------------------------------------
run through tiles[] to determine dimensions for composite raster
-------------------------------------------------------------------------- */
/* --- determine row and column bounds of composite raster --- */
for ( itile=0; itile<ntiles; itile++ )
{
subraster *tile = &(tiles[itile]); /* ptr to current tile */
/* --- upper-left corner of composite --- */
toprow = min2(toprow, tile->toprow);
leftcol = min2(leftcol, tile->leftcol);
/* --- lower-right corner of composite --- */
botrow = max2(botrow, tile->toprow + (tile->image)->height - 1);
rightcol = max2(rightcol, tile->leftcol + (tile->image)->width - 1);
/* --- pixsz of composite --- */
pixsz = max2(pixsz,(tile->image)->pixsz);
} /* --- end-of-for(itile) --- */
/* --- calculate width and height from bounds --- */
width = rightcol - leftcol + 1;
height = botrow - toprow + 1;
/* --- sanity check (quit if bad dimensions) --- */
if ( width<1 || height<1 ) goto end_of_job;
/* -------------------------------------------------------------------------
allocate composite raster, and embed tiles[] within it
-------------------------------------------------------------------------- */
/* --- allocate composite raster --- */
if ( (composite=new_raster(width,height,pixsz)) /*allocate composite raster*/
== (raster *)NULL ) goto end_of_job; /* and quit if failed */
/* --- embed tiles[] in composite --- */
for ( itile=0; itile<ntiles; itile++ )
{ subraster *tile = &(tiles[itile]); /* ptr to current tile */
rastput (composite, tile->image, /* overlay tile image at...*/
tile->toprow-toprow, tile->leftcol-leftcol, 1); } /*upper-left corner*/
/* -------------------------------------------------------------------------
Back to caller with composite raster (or null for any error)
-------------------------------------------------------------------------- */
end_of_job:
return ( composite ); /* back with composite or null ptr */
} /* --- end-of-function rastile() --- */
/* ==========================================================================
* Function: rastsmash ( sp1, sp2 )
* Purpose: When concatanating sp1||sp2, calculate #pixels
* we can "smash sp2 left"
* --------------------------------------------------------------------------
* Arguments: sp1 (I) subraster * to left-hand raster
* sp2 (I) subraster * to right-hand raster
* --------------------------------------------------------------------------
* Returns: ( int ) max #pixels we can smash sp1||sp2,
* or "blanksignal" if sp2 intentionally blank,
* or 0 for any error.
* --------------------------------------------------------------------------
* Notes: o
* ======================================================================= */
/* --- entry point --- */
int rastsmash ( subraster *sp1, subraster *sp2 )
{
/* -------------------------------------------------------------------------
Allocations and Declarations
-------------------------------------------------------------------------- */
int nsmash = 0; /* #pixels to smash sp1||sp2 */
int base1 = sp1->baseline, /*baseline for left-hand subraster*/
height1 = (sp1->image)->height, /* height for left-hand subraster */
width1 = (sp1->image)->width, /* width for left-hand subraster */
base2 = sp2->baseline, /*baseline for right-hand subraster*/
height2 = (sp2->image)->height, /* height for right-hand subraster */
width2 = (sp2->image)->width; /* width for right-hand subraster */
int base = max2(base1,base2), /* max ascenders - 1 above baseline*/
top1=base-base1, top2=base-base2, /* top irow indexes for sp1, sp2 */
bot1=top1+height1-1, bot2=top2+height2-1, /* bot irow indexes */
height = max2(bot1,bot2)+1; /* total height */
int irow1=0,irow2=0, icol=0; /* row,col indexes */
int firstcol1[1025], nfirst1=0, /* 1st sp1 col containing set pixel*/
firstcol2[1025], nfirst2=0; /* 1st sp2 col containing set pixel*/
int smin=9999, xmin=9999,ymin=9999; /* min separation (s=x+y) */
int type_raster(); /* display debugging output */
/* -------------------------------------------------------------------------
find right edge of sp1 and left edge of sp2 (these will be abutting edges)
-------------------------------------------------------------------------- */
/* --- check args --- */
if ( isstring ) goto end_of_job; /* ignore string rasters */
if ( 0 && istextmode ) goto end_of_job; /* don't smash in text mode */
if ( height > 1023 ) goto end_of_job; /* don't try to smash huge image */
if ( sp2->type == blanksignal ) /*blanksignal was propagated to us*/
goto end_of_job; /* don't smash intentional blank */
/* --- init firstcol1[], firstcol2[] --- */
for ( irow1=0; irow1<height; irow1++ ) /* for each row */
firstcol1[irow1] = firstcol2[irow1] = blanksignal; /* signal empty rows */
/* --- set firstcol2[] indicating left edge of sp2 --- */
for ( irow2=top2; irow2<=bot2; irow2++ ) /* for each row inside sp2 */
for ( icol=0; icol<width2; icol++ ) /* find first non-empty col in row */
if ( getpixel(sp2->image,irow2-top2,icol) != 0 ) /* found a set pixel */
{ firstcol2[irow2] = icol; /* icol is #cols from left edge */
nfirst2++; /* bump #rows containing set pixels*/
break; } /* and go on to next row */
if ( nfirst2 < 1 ) /*right-hand sp2 is completely blank*/
{ nsmash = blanksignal; /* signal intentional blanks */
goto end_of_job; } /* don't smash intentional blanks */
/* --- now check if preceding image in sp1 was an intentional blank --- */
if ( sp1->type == blanksignal ) /*blanksignal was propagated to us*/
goto end_of_job; /* don't smash intentional blank */
/* --- set firstcol1[] indicating right edge of sp1 --- */
for ( irow1=top1; irow1<=bot1; irow1++ ) /* for each row inside sp1 */
for ( icol=width1-1; icol>=0; icol-- ) /* find last non-empty col in row */
if ( getpixel(sp1->image,irow1-top1,icol) != 0 ) /* found a set pixel */
{ firstcol1[irow1] = (width1-1)-icol; /* save #cols from right edge */
nfirst1++; /* bump #rows containing set pixels*/
break; } /* and go on to next row */
if ( nfirst1 < 1 ) /*left-hand sp1 is completely blank*/
goto end_of_job; /* don't smash intentional blanks */
/* -------------------------------------------------------------------------
find minimum separation
-------------------------------------------------------------------------- */
for ( irow2=top2; irow2<=bot2; irow2++ ) { /* check each row inside sp2 */
int margin1, margin2=firstcol2[irow2]; /* #cols to first set pixel */
if ( margin2 != blanksignal ) /* irow2 not an empty/blank row */
for ( irow1=max2(irow2-smin,top1); ; irow1++ )
if ( irow1 > min2(irow2+smin,bot1) ) break; /* upper bound check */
else
if ( (margin1=firstcol1[irow1]) != blanksignal ) { /*have non-blank row*/
int dx=(margin1+margin2), dy=absval(irow2-irow1), ds=dx+dy; /* deltas */
if ( ds >= smin ) continue; /* min unchanged */
if ( dy>smashmargin && dx<xmin && smin<9999 ) continue; /* dy alone */
smin=ds; xmin=dx; ymin=dy; /* set new min */
} /* --- end-of-if(margin1!=blanksignal) --- */
if ( smin<2 ) goto end_of_job; /* can't smash */
} /* --- end-of-for(irow2) --- */
/*nsmash = min2(xmin,width2);*/ /* permissible smash */
nsmash = xmin; /* permissible smash */
/* -------------------------------------------------------------------------
Back to caller with #pixels to smash sp1||sp2
-------------------------------------------------------------------------- */
end_of_job:
/* --- debugging output --- */
if ( msgfp!=NULL && msglevel >= 99 ) /* display for debugging */
{ fprintf(msgfp,"rastsmash> nsmash=%d, smashmargin=%d\n",
nsmash,smashmargin);
if ( msglevel >= 999 ) /* also display rasters */
{ fprintf(msgfp,"rastsmash>left-hand image...\n");
if(sp1!=NULL) type_raster(sp1->image,msgfp); /* left image */
fprintf(msgfp,"rastsmash>right-hand image...\n");
if(sp2!=NULL) type_raster(sp2->image,msgfp); } /* right image */
fflush(msgfp); }
return ( nsmash ); /* back with #smash pixels */
} /* --- end-of-function rastsmash() --- */
/* ==========================================================================
* Function: accent_subraster ( accent, width, height, pixsz )
* Purpose: Allocate a new subraster of width x height
* (or maybe different dimensions, depending on accent),
* and draw an accent (\hat or \vec or \etc) that fills it
* --------------------------------------------------------------------------
* Arguments: accent (I) int containing either HATACCENT or VECACCENT,
* etc, indicating the type of accent desired
* width (I) int containing desired width of accent (#cols)
* height (I) int containing desired height of accent(#rows)
* pixsz (I) int containing 1 for bitmap, 8 for bytemap
* --------------------------------------------------------------------------
* Returns: ( subraster * ) ptr to newly-allocated subraster with accent,
* or NULL for any error.
* --------------------------------------------------------------------------
* Notes: o Some accents have internally-determined dimensions,
* and caller should check dimensions in returned subraster
* ======================================================================= */
/* --- entry point --- */
subraster *accent_subraster ( int accent, int width, int height, int pixsz )
{
/* -------------------------------------------------------------------------
Allocations and Declarations
-------------------------------------------------------------------------- */
/* --- general info --- */
raster *new_raster(), *rp=NULL; /*raster containing desired accent*/
subraster *new_subraster(), *sp=NULL; /* subraster returning accent */
int delete_raster(), delete_subraster(); /*free allocated raster on err*/
int line_raster(), /* draws lines */
rule_raster(), /* draw solid boxes */
thickness = 1; /* line thickness */
/*int pixval = (pixsz==1? 1 : (pixsz==8?255:(-1)));*/ /*black pixel value*/
/* --- other working info --- */
int col0, col1, /* cols for line */
row0, row1; /* rows for line */
subraster *get_delim(), *accsp=NULL; /*find suitable cmex10 symbol/accent*/
/* --- info for under/overbraces, tildes, etc --- */
char brace[16]; /*"{" for over, "}" for under, etc*/
raster *rastrot(), /* rotate { for overbrace, etc */
*rastcpy(); /* may need copy of original */
subraster *arrow_subraster(); /* rightarrow for vec */
subraster *rastack(); /* stack accent atop extra space */
/* -------------------------------------------------------------------------
outer switch() traps accents that may change caller's height,width
-------------------------------------------------------------------------- */
switch ( accent )
{
default:
/* -----------------------------------------------------------------------
inner switch() first allocates fixed-size raster for accents that don't
------------------------------------------------------------------------ */
if ( (rp = new_raster(width,height,pixsz)) /* allocate fixed-size raster */
!= NULL ) /* and if we succeeded... */
switch ( accent ) /* ...draw requested accent in it */
{
/* --- unrecognized request --- */
default: delete_raster(rp); /* unrecognized accent requested */
rp = NULL; break; /* so free raster and signal error */
/* --- bar request --- */
case UNDERBARACCENT:
case BARACCENT:
thickness = 1; /*height-1;*/ /* adjust thickness */
if ( accent == BARACCENT ) /* bar is above expression */
{ row0 = row1 = max2(height-3,0); /* row numbers for overbar */
line_raster(rp,row0,0,row1,width-1,thickness); } /*blanks at bot*/
else /* underbar is below expression */
{ row0 = row1 = min2(2,height-1); /* row numbers for underbar */
line_raster(rp,row0,0,row1,width-1,thickness); } /*blanks at top*/
break;
/* --- dot request --- */
case DOTACCENT:
thickness = height-1; /* adjust thickness */
/*line_raster(rp,0,width/2,1,(width/2)+1,thickness);*//*centered dot*/
rule_raster(rp,0,(width+1-thickness)/2,thickness,thickness,3); /*box*/
break;
/* --- ddot request --- */
case DDOTACCENT:
thickness = height-1; /* adjust thickness */
col0 = max2((width+1)/3-(thickness/2)-1,0); /* one-third of width */
col1 = min2((2*width+1)/3-(thickness/2)+1,width-thickness); /*2/3rds*/
if ( col0+thickness >= col1 ) /* dots overlap */
{ col0 = max2(col0-1,0); /* try moving left dot more left */
col1 = min2(col1+1,width-thickness); } /* and right dot right */
if ( col0+thickness >= col1 ) /* dots _still_ overlap */
thickness = max2(thickness-1,1); /* so try reducing thickness */
/*line_raster(rp,0,col0,1,col0+1,thickness);*//*set dot at 1st third*/
/*line_raster(rp,0,col1,1,col1+1,thickness);*//*and another at 2nd*/
rule_raster(rp,0,col0,thickness,thickness,3); /*box at 1st third*/
rule_raster(rp,0,col1,thickness,thickness,3); /*box at 2nd third*/
break;
/* --- hat request --- */
case HATACCENT:
thickness = 1; /*(width<=12? 2 : 3);*/ /* adjust thickness */
line_raster(rp,height-1,0,0,width/2,thickness); /* / part of hat*/
line_raster(rp,0,(width-1)/2,height-1,width-1,thickness); /* \ part*/
break;
/* --- sqrt request --- */
case SQRTACCENT:
col1 = SQRTWIDTH(height) - 1; /* right col of sqrt symbol */
col0 = (col1+2)/3; /* midpoint col of sqrt */
row0 = (height+1)/2; /* midpoint row of sqrt */
row1 = height-1; /* bottom row of sqrt */
line_raster(rp,row0,0,row1,col0,thickness); /* descending portion */
line_raster(rp,row1,col0,0,col1,thickness); /* ascending portion */
line_raster(rp,0,col1,0,width-1,thickness); /*overbar of thickness 1*/
break;
} /* --- end-of-inner-switch(accent) --- */
break; /* break from outer accent switch */
/* --- underbrace, overbrace request --- */
case UNDERBRACE:
case OVERBRACE:
if ( accent == UNDERBRACE ) strcpy(brace,"}"); /* start with } brace */
if ( accent == OVERBRACE ) strcpy(brace,"{"); /* start with { brace */
if ( (accsp=get_delim(brace,width,CMEX10)) /* use width for height */
!= NULL ) /* found desired brace */
{ rp = rastrot(accsp->image); /* rotate 90 degrees clockwise */
delete_subraster(accsp); } /* and free subraster "envelope" */
break;
/* --- hat request --- */
case HATACCENT:
if ( accent == HATACCENT ) strcpy(brace,"<"); /* start with < */
if ( (accsp=get_delim(brace,width,CMEX10)) /* use width for height */
!= NULL ) /* found desired brace */
{ rp = rastrot(accsp->image); /* rotate 90 degrees clockwise */
delete_subraster(accsp); } /* and free subraster "envelope" */
break;
/* --- vec request --- */
case VECACCENT:
height = 2*(height/2) + 1; /* force height odd */
if ( (accsp=arrow_subraster(width,height,pixsz,1,0)) /*build rightarrow*/
!= NULL ) /* succeeded */
{ rp = accsp->image; /* "extract" raster with bitmap */
free((void *)accsp); } /* and free subraster "envelope" */
break;
/* --- tilde request --- */
case TILDEACCENT:
accsp=(width<25? get_delim("\\sim",-width,CMSY10) :
get_delim("~",-width,CMEX10)); /*width search for tilde*/
if ( accsp != NULL ) /* found desired tilde */
if ( (sp=rastack(new_subraster(1,1,pixsz),accsp,1,0,1,3))/*space below*/
!= NULL ) /* have tilde with space below it */
{ rp = sp->image; /* "extract" raster with bitmap */
free((void *)sp); /* and free subraster "envelope" */
leftsymdef = NULL; } /* so \tilde{x}^2 works properly */
break;
} /* --- end-of-outer-switch(accent) --- */
/* -------------------------------------------------------------------------
if we constructed accent raster okay, embed it in a subraster and return it
-------------------------------------------------------------------------- */
/* --- if all okay, allocate subraster to contain constructed raster --- */
if ( rp != NULL ) /* accent raster constructed okay */
if ( (sp=new_subraster(0,0,0)) /* allocate subraster "envelope" */
== NULL ) /* and if we fail to allocate */
delete_raster(rp); /* free now-unneeded raster */
else /* subraster allocated okay */
{ /* --- init subraster parameters, embedding raster in it --- */
sp->type = IMAGERASTER; /* constructed image */
sp->image = rp; /* raster we just constructed */
sp->size = (-1); /* can't set font size here */
sp->baseline = 0; } /* can't set baseline here */
/* --- return subraster containing desired accent to caller --- */
return ( sp ); /* return accent or NULL to caller */
} /* --- end-of-function accent_subraster() --- */
/* ==========================================================================
* Function: arrow_subraster ( width, height, pixsz, drctn, isBig )
* Purpose: Allocate a raster/subraster and draw left/right arrow in it
* --------------------------------------------------------------------------
* Arguments: width (I) int containing number of cols for arrow
* height (I) int containing number of rows for arrow
* pixsz (I) int containing 1 for bitmap, 8 for bytemap
* drctn (I) int containing +1 for right arrow,
* or -1 for left, 0 for leftright
* isBig (I) int containing 1/true for \Long arrows,
* or false for \long arrows, i.e.,
* true for ===> or false for --->.
* --------------------------------------------------------------------------
* Returns: ( subraster * ) ptr to constructed left/right arrow
* or NULL for any error.
* --------------------------------------------------------------------------
* Notes: o
* ======================================================================= */
/* --- entry point --- */
subraster *arrow_subraster ( int width, int height, int pixsz,
int drctn, int isBig )
{
/* -------------------------------------------------------------------------
Allocations and Declarations
-------------------------------------------------------------------------- */
subraster *new_subraster(), *arrowsp=NULL; /* allocate arrow subraster */
int rule_raster(); /* draw arrow line */
int irow, midrow=height/2; /* index, midrow is arrowhead apex */
int icol, thickness=(height>15?2:2); /* arrowhead thickness and index */
int pixval = (pixsz==1? 1 : (pixsz==8?255:(-1))); /* black pixel value */
int ipix, /* raster pixmap[] index */
npix = width*height; /* #pixels malloced in pixmap[] */
/* -------------------------------------------------------------------------
allocate raster/subraster and draw arrow line
-------------------------------------------------------------------------- */
if ( height < 3 ) { height=3; midrow=1; } /* set minimum height */
if ( (arrowsp=new_subraster(width,height,pixsz)) /* allocate empty raster */
== NULL ) goto end_of_job; /* and quit if failed */
if ( !isBig ) /* single line */
rule_raster(arrowsp->image,midrow,0,width,1,0); /*draw line across midrow*/
else
{ int delta = (width>6? (height>15? 3: (height>7? 2 : 1)) : 1);
rule_raster(arrowsp->image,midrow-delta,delta,width-2*delta,1,0);
rule_raster(arrowsp->image,midrow+delta,delta,width-2*delta,1,0); }
/* -------------------------------------------------------------------------
construct arrowhead(s)
-------------------------------------------------------------------------- */
for ( irow=0; irow<height; irow++ ) /* for each row of arrow */
{
int delta = abs(irow-midrow); /*arrowhead offset for irow*/
/* --- right arrowhead --- */
if ( drctn >= 0 ) /* right arrowhead wanted */
for ( icol=0; icol<thickness; icol++ ) /* for arrowhead thickness */
{ ipix = ((irow+1)*width - 1) - delta - icol; /* rightmost-delta-icol */
if ( ipix >= 0 ) /* bounds check */
if ( pixsz == 1 ) /* have a bitmap */
setlongbit((arrowsp->image)->pixmap,ipix);/*turn on arrowhead bit*/
else /* should have a bytemap */
if ( pixsz == 8 ) /* check pixsz for bytemap */
((arrowsp->image)->pixmap)[ipix] = pixval; } /*set arrowhead byte*/
/* --- left arrowhead (same as right except for ipix calculation) --- */
if ( drctn <= 0 ) /* left arrowhead wanted */
for ( icol=0; icol<thickness; icol++ ) /* for arrowhead thickness */
{ ipix = irow*width + delta + icol; /* leftmost bit+delta+icol */
if ( ipix < npix ) /* bounds check */
if ( pixsz == 1 ) /* have a bitmap */
setlongbit((arrowsp->image)->pixmap,ipix);/*turn on arrowhead bit*/
else /* should have a bytemap */
if ( pixsz == 8 ) /* check pixsz for bytemap */
((arrowsp->image)->pixmap)[ipix] = pixval; } /*set arrowhead byte*/
} /* --- end-of-for(irow) --- */
end_of_job:
return ( arrowsp ); /*back to caller with arrow or NULL*/
} /* --- end-of-function arrow_subraster() --- */
/* ==========================================================================
* Function: uparrow_subraster ( width, height, pixsz, drctn, isBig )
* Purpose: Allocate a raster/subraster and draw up/down arrow in it
* --------------------------------------------------------------------------
* Arguments: width (I) int containing number of cols for arrow
* height (I) int containing number of rows for arrow
* pixsz (I) int containing 1 for bitmap, 8 for bytemap
* drctn (I) int containing +1 for up arrow,
* or -1 for down, or 0 for updown
* isBig (I) int containing 1/true for \Long arrows,
* or false for \long arrows, i.e.,
* true for ===> or false for --->.
* --------------------------------------------------------------------------
* Returns: ( subraster * ) ptr to constructed up/down arrow
* or NULL for any error.
* --------------------------------------------------------------------------
* Notes: o
* ======================================================================= */
/* --- entry point --- */
subraster *uparrow_subraster ( int width, int height, int pixsz,
int drctn, int isBig )
{
/* -------------------------------------------------------------------------
Allocations and Declarations
-------------------------------------------------------------------------- */
subraster *new_subraster(), *arrowsp=NULL; /* allocate arrow subraster */
int rule_raster(); /* draw arrow line */
int icol, midcol=width/2; /* index, midcol is arrowhead apex */
int irow, thickness=(width>15?2:2); /* arrowhead thickness and index */
int pixval = (pixsz==1? 1 : (pixsz==8?255:(-1))); /* black pixel value */
int ipix, /* raster pixmap[] index */
npix = width*height; /* #pixels malloced in pixmap[] */
/* -------------------------------------------------------------------------
allocate raster/subraster and draw arrow line
-------------------------------------------------------------------------- */
if ( width < 3 ) { width=3; midcol=1; } /* set minimum width */
if ( (arrowsp=new_subraster(width,height,pixsz)) /* allocate empty raster */
== NULL ) goto end_of_job; /* and quit if failed */
if ( !isBig ) /* single line */
rule_raster(arrowsp->image,0,midcol,1,height,0); /*draw line down midcol*/
else
{ int delta = (height>6? (width>15? 3: (width>7? 2 : 1)) : 1);
rule_raster(arrowsp->image,delta,midcol-delta,1,height-2*delta,0);
rule_raster(arrowsp->image,delta,midcol+delta,1,height-2*delta,0); }
/* -------------------------------------------------------------------------
construct arrowhead(s)
-------------------------------------------------------------------------- */
for ( icol=0; icol<width; icol++ ) /* for each col of arrow */
{
int delta = abs(icol-midcol); /*arrowhead offset for icol*/
/* --- up arrowhead --- */
if ( drctn >= 0 ) /* up arrowhead wanted */
for ( irow=0; irow<thickness; irow++ ) /* for arrowhead thickness */
{ ipix = (irow+delta)*width + icol; /* leftmost+icol */
if ( ipix < npix ) /* bounds check */
if ( pixsz == 1 ) /* have a bitmap */
setlongbit((arrowsp->image)->pixmap,ipix);/*turn on arrowhead bit*/
else /* should have a bytemap */
if ( pixsz == 8 ) /* check pixsz for bytemap */
((arrowsp->image)->pixmap)[ipix] = pixval; } /*set arrowhead byte*/
/* --- down arrowhead (same as up except for ipix calculation) --- */
if ( drctn <= 0 ) /* down arrowhead wanted */
for ( irow=0; irow<thickness; irow++ ) /* for arrowhead thickness */
{ ipix = (height-1-delta-irow)*width + icol; /* leftmost + icol */
if ( ipix > 0 ) /* bounds check */
if ( pixsz == 1 ) /* have a bitmap */
setlongbit((arrowsp->image)->pixmap,ipix);/*turn on arrowhead bit*/
else /* should have a bytemap */
if ( pixsz == 8 ) /* check pixsz for bytemap */
((arrowsp->image)->pixmap)[ipix] = pixval; } /*set arrowhead byte*/
} /* --- end-of-for(icol) --- */
end_of_job:
return ( arrowsp ); /*back to caller with arrow or NULL*/
} /* --- end-of-function uparrow_subraster() --- */
/* ==========================================================================
* Function: rule_raster ( rp, top, left, width, height, type )
* Purpose: Draw a solid or dashed line (or box) in existing raster rp,
* starting at top,left with dimensions width,height.
* --------------------------------------------------------------------------
* Arguments: rp (I) raster * to raster in which rule
* will be drawn
* top (I) int containing row at which top-left corner
* of rule starts (0 is topmost)
* left (I) int containing col at which top-left corner
* of rule starts (0 is leftmost)
* width (I) int containing number of cols for rule
* height (I) int containing number of rows for rule
* type (I) int containing 0 for solid rule,
* 1 for horizontal dashes, 2 for vertical
* 3 for solid rule with corners removed
* --------------------------------------------------------------------------
* Returns: ( int ) 1 if rule drawn okay,
* or 0 for any error.
* --------------------------------------------------------------------------
* Notes: o Rule line is implicitly "horizontal" or "vertical" depending
* on relative width,height dimensions. It's a box if they're
* more or less comparable.
* ======================================================================= */
/* --- entry point --- */
int rule_raster ( raster *rp, int top, int left,
int width, int height, int type )
{
/* -------------------------------------------------------------------------
Allocations and Declarations
-------------------------------------------------------------------------- */
int irow=0, icol=0; /* indexes over rp raster */
int ipix = 0, /* raster pixmap[] index */
npix = rp->width * rp->height; /* #pixels malloced in rp->pixmap[] */
int isfatal = 0; /* true to abend on out-of-bounds error */
int hdash=1, vdash=2; /* type for horizontal, vertical dashes */
int dashlen=3, spacelen=2, /* #pixels for dash followed by space */
isdraw=1; /* true when drawing dash (init for solid) */
/* -------------------------------------------------------------------------
Check args
-------------------------------------------------------------------------- */
if ( rp == (raster *)NULL ) /* no raster arg supplied */
if ( workingbox != (subraster *)NULL ) /* see if we have a workingbox */
rp = workingbox->image; /* use workingbox if possible */
else return ( 0 ); /* otherwise signal error to caller */
if ( type == 3 ) /* remove corners of solid box */
if ( width<3 || height<3 ) type=0; /* too small to remove corners */
/* -------------------------------------------------------------------------
Fill line/box
-------------------------------------------------------------------------- */
for ( irow=top; irow<top+height; irow++ ) /*each scan line*/
{
if ( type == vdash ) /*set isdraw for vert dash*/
isdraw = (((irow-top)%(dashlen+spacelen)) < dashlen);
ipix = irow*rp->width + left - 1; /*first pixel preceding icol*/
for ( icol=left; icol<left+width; icol++ ) /* each pixel in scan line */
{
if ( type == 3 ) /* remove corners of box */
if ( (irow==top && icol==left) /* top-left corner */
|| (irow==top && icol>=left+width-1) /* top-right corner */
|| (irow>=top+height-1 && icol==left) /* bottom-left corner */
|| (irow>=top+height-1 && icol>=left+width-1) ) /* bottom-right */
isdraw = 0; else isdraw = 1; /*set isdraw to skip corner*/
if ( type == hdash ) /*set isdraw for horiz dash*/
isdraw = (((icol-left)%(dashlen+spacelen)) < dashlen);
if ( ++ipix >= npix ) /* bounds check failed */
if ( isfatal ) goto end_of_job; /* abort if error is fatal */
else break; /*or just go on to next row*/
else /*ibit is within rp bounds*/
if ( isdraw ) /*and we're drawing this bit*/
if ( rp->pixsz == 1 ) /* have a bitmap */
setlongbit(rp->pixmap,ipix); /* so turn on bit in line */
else /* should have a bytemap */
if ( rp->pixsz == 8 ) /* check pixsz for bytemap */
((unsigned char *)(rp->pixmap))[ipix] = 255; /* set black byte */
} /* --- end-of-for(icol) --- */
} /* --- end-of-for(irow) --- */
end_of_job:
return ( isfatal? (ipix<npix? 1:0) : 1 );
} /* --- end-of-function rule_raster() --- */
/* ==========================================================================
* Function: line_raster ( rp, row0, col0, row1, col1, thickness )
* Purpose: Draw a line from row0,col0 to row1,col1 of thickness
* in existing raster rp.
* --------------------------------------------------------------------------
* Arguments: rp (I) raster * to raster in which a line
* will be drawn
* row0 (I) int containing row at which
* line will start (0 is topmost)
* col0 (I) int containing col at which
* line will start (0 is leftmost)
* row1 (I) int containing row at which
* line will end (rp->height-1 is bottom-most)
* col1 (I) int containing col at which
* line will end (rp->width-1 is rightmost)
* thickness (I) int containing number of pixels/bits
* thick the line will be
* --------------------------------------------------------------------------
* Returns: ( int ) 1 if line drawn okay,
* or 0 for any error.
* --------------------------------------------------------------------------
* Notes: o if row0==row1, a horizontal line is drawn
* between col0 and col1, with row0(==row1) the top row
* and row0+(thickness-1) the bottom row
* o if col0==col1, a vertical bar is drawn
* between row0 and row1, with col0(==col1) the left col
* and col0+(thickness-1) the right col
* o if both the above, you get a square thickness x thickness
* whose top-left corner is row0,col0.
* ======================================================================= */
/* --- entry point --- */
int line_raster ( raster *rp, int row0, int col0,
int row1, int col1, int thickness )
{
/* -------------------------------------------------------------------------
Allocations and Declarations
-------------------------------------------------------------------------- */
int irow=0, icol=0, /* indexes over rp raster */
locol=col0, hicol=col1, /* col limits at irow */
lorow=row0, hirow=row1; /* row limits at icol */
int width=rp->width, height=rp->height; /* dimensions of input raster */
int ipix = 0, /* raster pixmap[] index */
npix = width*height; /* #pixels malloced in rp->pixmap[] */
int isfatal = 0; /* true to abend on out-of-bounds error */
int isline=(row1==row0), isbar=(col1==col0); /*true if slope a=0,\infty*/
double dy = row1-row0 /* + (row1>=row0? +1.0 : -1.0) */, /* delta-x */
dx = col1-col0 /* + (col1>=col0? +1.0 : -1.0) */, /* delta-y */
a= (isbar||isline? 0.0 : dy/dx), /* slope = tan(theta) = dy/dx */
xcol=0, xrow=0; /* calculated col at irow, or row at icol */
double ar = ASPECTRATIO, /* aspect ratio width/height of one pixel */
xwidth= (isline? 0.0 : /*#pixels per row to get sloped line thcknss*/
((double)thickness)*sqrt((dx*dx)+(dy*dy*ar*ar))/fabs(dy*ar)),
xheight = 1.0;
int line_recurse(), isrecurse=1; /* true to draw line recursively */
/* -------------------------------------------------------------------------
Check args
-------------------------------------------------------------------------- */
if ( rp == (raster *)NULL ) /* no raster arg supplied */
if ( workingbox != (subraster *)NULL ) /* see if we have a workingbox */
rp = workingbox->image; /* use workingbox if possible */
else return ( 0 ); /* otherwise signal error to caller */
/* -------------------------------------------------------------------------
Initialization
-------------------------------------------------------------------------- */
if ( msgfp!=NULL && msglevel>=29 ) /* debugging */
fprintf(msgfp,"line_raster> row,col0=%d,%d row,col1=%d,%d, thickness=%d\n"
"\t dy,dx=%3.1f,%3.1f, a=%4.3f, xwidth=%4.3f\n",
row0,col0, row1,col1, thickness, dy,dx, a, xwidth);
/* --- check for recursive line drawing --- */
if ( isrecurse ) { /* drawing lines recursively */
for ( irow=0; irow<thickness; irow++ ) /* each line 1 pixel thick */
{ double xrow0=(double)row0, xcol0=(double)col0,
xrow1=(double)row1, xcol1=(double)col1;
if ( isline ) xrow0 = xrow1 = (double)(row0+irow);
else if ( isbar ) xcol0 = xcol1 = (double)(col0+irow);
if( xrow0>(-0.001) && xcol0>(-0.001) /*check line inside raster*/
&& xrow1<((double)(height-1)+0.001) && xcol1<((double)(width-1)+0.001) )
line_recurse(rp,xrow0,xcol0,xrow1,xcol1,thickness); }
return ( 1 ); }
/* --- set params for horizontal line or vertical bar --- */
if ( isline ) /*interpret row as top row*/
row1 = row0 + (thickness-1); /* set bottom row for line */
if ( 0&&isbar ) /*interpret col as left col*/
hicol = col0 + (thickness-1); /* set right col for bar */
/* -------------------------------------------------------------------------
draw line one row at a time
-------------------------------------------------------------------------- */
for ( irow=min2(row0,row1); irow<=max2(row0,row1); irow++ ) /*each scan line*/
{
if ( !isbar && !isline ) /* neither vert nor horiz */
{ xcol = col0 + ((double)(irow-row0))/a; /* "middle" col in irow */
locol = max2((int)(xcol-0.5*(xwidth-1.0)),0); /* leftmost col */
hicol = min2((int)(xcol+0.5*(xwidth-0.0)),max2(col0,col1)); } /*right*/
if ( msgfp!=NULL && msglevel>=29 ) /* debugging */
fprintf(msgfp,"\t irow=%d, xcol=%4.2f, lo,hicol=%d,%d\n",
irow,xcol,locol,hicol);
ipix = irow*rp->width + min2(locol,hicol) - 1; /*first pix preceding icol*/
for ( icol=min2(locol,hicol); icol<=max2(locol,hicol); icol++ ) /*each pix*/
if ( ++ipix >= npix ) /* bounds check failed */
if ( isfatal ) goto end_of_job; /* abort if error is fatal */
else break; /*or just go on to next row*/
else /* turn on pixel in line */
if ( rp->pixsz == 1 ) /* have a pixel bitmap */
setlongbit(rp->pixmap,ipix); /* so turn on bit in line */
else /* should have a bytemap */
if ( rp->pixsz == 8 ) /* check pixsz for bytemap */
((unsigned char *)(rp->pixmap))[ipix] = 255; /* set black byte */
} /* --- end-of-for(irow) --- */
/* -------------------------------------------------------------------------
now _redraw_ line one col at a time to avoid "gaps"
-------------------------------------------------------------------------- */
if ( 1 )
for ( icol=min2(col0,col1); icol<=max2(col0,col1); icol++ )/*each scan line*/
{
if ( !isbar && !isline ) /* neither vert nor horiz */
{ xrow = row0 + ((double)(icol-col0))*a; /* "middle" row in icol */
lorow = max2((int)(xrow-0.5*(xheight-1.0)),0); /* topmost row */
hirow = min2((int)(xrow+0.5*(xheight-0.0)),max2(row0,row1)); } /*bot*/
if ( msgfp!=NULL && msglevel>=29 ) /* debugging */
fprintf(msgfp,"\t icol=%d, xrow=%4.2f, lo,hirow=%d,%d\n",
icol,xrow,lorow,hirow);
ipix = irow*rp->width + min2(locol,hicol) - 1; /*first pix preceding icol*/
for ( irow=min2(lorow,hirow); irow<=max2(lorow,hirow); irow++ ) /*each pix*/
if ( irow<0 || irow>=rp->height
|| icol<0 || icol>=rp->width ) /* bounds check */
if ( isfatal ) goto end_of_job; /* abort if error is fatal */
else continue; /*or just go on to next row*/
else
setpixel(rp,irow,icol,255); /* set pixel at irow,icol */
} /* --- end-of-for(irow) --- */
/* -------------------------------------------------------------------------
Back to caller with 1=okay, 0=failed.
-------------------------------------------------------------------------- */
end_of_job:
return ( isfatal? (ipix<npix? 1:0) : 1 );
} /* --- end-of-function line_raster() --- */
/* ==========================================================================
* Function: line_recurse ( rp, row0, col0, row1, col1, thickness )
* Purpose: Draw a line from row0,col0 to row1,col1 of thickness
* in existing raster rp.
* --------------------------------------------------------------------------
* Arguments: rp (I) raster * to raster in which a line
* will be drawn
* row0 (I) double containing row at which
* line will start (0 is topmost)
* col0 (I) double containing col at which
* line will start (0 is leftmost)
* row1 (I) double containing row at which
* line will end (rp->height-1 is bottom-most)
* col1 (I) double containing col at which
* line will end (rp->width-1 is rightmost)
* thickness (I) int containing number of pixels/bits
* thick the line will be
* --------------------------------------------------------------------------
* Returns: ( int ) 1 if line drawn okay,
* or 0 for any error.
* --------------------------------------------------------------------------
* Notes: o Recurses, drawing left- and right-halves of line
* until a horizontal or vertical segment is found
* ======================================================================= */
/* --- entry point --- */
int line_recurse ( raster *rp, double row0, double col0,
double row1, double col1, int thickness )
{
/* -------------------------------------------------------------------------
Allocations and Declarations
-------------------------------------------------------------------------- */
double delrow = fabs(row1-row0), /* 0 if line horizontal */
delcol = fabs(col1-col0), /* 0 if line vertical */
tolerance = 0.5; /* draw line when it goes to point */
double midrow = 0.5*(row0+row1), /* midpoint row */
midcol = 0.5*(col0+col1); /* midpoint col */
/* -------------------------------------------------------------------------
recurse if either delta > tolerance
-------------------------------------------------------------------------- */
if ( delrow > tolerance /* row hasn't converged */
|| delcol > tolerance ) /* col hasn't converged */
{ line_recurse(rp,row0,col0,midrow,midcol,thickness); /* left half */
line_recurse(rp,midrow,midcol,row1,col1,thickness); /* right half */
return ( 1 ); }
/* -------------------------------------------------------------------------
draw converged point
-------------------------------------------------------------------------- */
setpixel(rp,iround(midrow),iround(midcol),255); /*set pixel at midrow,midcol*/
return ( 1 );
} /* --- end-of-function line_recurse() --- */
/* ==========================================================================
* Function: circle_raster ( rp, row0, col0, row1, col1,
* thickness, quads )
* Purpose: Draw quad(rant)s of an ellipse in box determined by
* diagonally opposite corner points (row0,col0) and
* (row1,col1), of thickness pixels in existing raster rp.
* --------------------------------------------------------------------------
* Arguments: rp (I) raster * to raster in which an ellipse
* will be drawn
* row0 (I) int containing 1st corner row bounding ellipse
* (0 is topmost)
* col0 (I) int containing 1st corner col bounding ellipse
* (0 is leftmost)
* row1 (I) int containing 2nd corner row bounding ellipse
* (rp->height-1 is bottom-most)
* col1 (I) int containing 2nd corner col bounding ellipse
* (rp->width-1 is rightmost)
* thickness (I) int containing number of pixels/bits
* thick the ellipse arc line will be
* quads (I) char * to null-terminated string containing
* any subset/combination of "1234" specifying
* which quadrant(s) of ellipse to draw.
* NULL ptr draws all four quadrants;
* otherwise 1=upper-right quadrant,
* 2=uper-left, 3=lower-left, 4=lower-right,
* i.e., counterclockwise from 1=positive quad.
* --------------------------------------------------------------------------
* Returns: ( int ) 1 if ellipse drawn okay,
* or 0 for any error.
* --------------------------------------------------------------------------
* Notes: o row0==row1 or col0==col1 are errors
* o using ellipse equation x^2/a^2 + y^2/b^2 = 1
* ======================================================================= */
/* --- entry point --- */
int circle_raster ( raster *rp, int row0, int col0,
int row1, int col1, int thickness, char *quads )
{
/* -------------------------------------------------------------------------
Allocations and Declarations
-------------------------------------------------------------------------- */
/* --- lower-left and upper-right bounding points (in our coords) --- */
int lorow = min2(row0,row1), /* lower bounding row (top of box) */
locol = min2(col0,col1), /* lower bounding col (left of box)*/
hirow = max2(row0,row1), /* upper bounding row (bot of box) */
hicol = max2(col0,col1); /* upper bounding col (right of box)*/
/* --- a and b ellipse params --- */
int width = hicol-locol+1, /* width of bounding box */
height= hirow-lorow+1, /* height of bounding box */
islandscape = (width>=height? 1:0); /*true if ellipse lying on side*/
double a = ((double)width)/2.0, /* x=a when y=0 */
b = ((double)height)/2.0, /* y=b when x=0 */
abmajor = (islandscape? a : b), /* max2(a,b) */
abminor = (islandscape? b : a), /* min2(a,b) */
abmajor2 = abmajor*abmajor, /* abmajor^2 */
abminor2 = abminor*abminor; /* abminor^2 */
/* --- other stuff --- */
int imajor=0, nmajor=max2(width,height), /*index, #pixels on major axis*/
iminor=0, nminor=min2(width,height); /* solved index on minor axis */
int irow, icol, /* raster indexes at circumference */
rsign=1, csign=1; /* row,col signs, both +1 in quad 1*/
double midrow= ((double)(row0+row1))/2.0, /* center row */
midcol= ((double)(col0+col1))/2.0; /* center col */
double xy, xy2, /* major axis ellipse coord */
yx2, yx; /* solved minor ellipse coord */
int isokay = 1; /* true if no pixels out-of-bounds */
char *qptr=NULL, *allquads="1234"; /* quadrants if input quads==NULL */
int circle_recurse(), isrecurse=1; /* true to draw ellipse recursively*/
/* -------------------------------------------------------------------------
pixel-by-pixel along positive major axis, quit when it goes negative
-------------------------------------------------------------------------- */
if ( quads == NULL ) quads = allquads; /* draw all quads, or only user's */
if ( msgfp!=NULL && msglevel>=39 ) /* debugging */
fprintf(msgfp,"circle_raster> width,height;quads=%d,%d,%s\n",
width,height,quads);
if ( nmajor < 1 ) isokay = 0; /* problem with input args */
else
{
if ( isrecurse ) /* use recursive algorithm */
{
for ( qptr=quads; *qptr!='\000'; qptr++ ) /* for each character in quads */
{
double theta0=0.0, theta1=0.0; /* set thetas based on quadrant */
switch ( *qptr ) /* check for quadrant 1,2,3,4 */
{ default: /* unrecognized, assume quadrant 1 */
case '1': theta0= 0.0; theta1= 90.0; break; /* first quadrant */
case '2': theta0= 90.0; theta1=180.0; break; /* second quadrant */
case '3': theta0=180.0; theta1=270.0; break; /* third quadrant */
case '4': theta0=270.0; theta1=360.0; break; } /* fourth quadrant */
circle_recurse(rp,row0,col0,row1,col1,thickness,theta0,theta1);
} /* --- end-of-for(qptr) --- */
return ( 1 );
} /* --- end-of-if(isrecurse) --- */
for ( imajor=(nmajor+1)/2; ; imajor-- )
{
/* --- xy is coord along major axis, yx is "solved" along minor axis --- */
xy = ((double)imajor); /* xy = abmajor ... 0 */
if ( xy < 0.0 ) break; /* negative side symmetrical */
yx2 = abminor2*(1.0 - xy*xy/abmajor2); /* "solve" ellipse equation */
yx = (yx2>0.0? sqrt(yx2) : 0.0); /* take sqrt if possible */
iminor = iround(yx); /* nearest integer */
/* --- set pixels for each requested quadrant --- */
for ( qptr=quads; *qptr!='\000'; qptr++ ) /* for each character in quads */
{
rsign = (-1); csign = 1; /* init row,col in user quadrant 1 */
switch ( *qptr ) /* check for quadrant 1,2,3,4 */
{ default: break; /* unrecognized, assume quadrant 1 */
case '4': rsign = 1; break; /* row,col both pos in quadrant 4 */
case '3': rsign = 1; /* row pos, col neg in quadrant 3 */
case '2': csign = (-1); break; } /* row,col both neg in quadrant 2 */
irow = iround(midrow + (double)rsign*(islandscape?yx:xy));
irow = min2(hirow,max2(lorow,irow)); /* keep irow in bounds */
icol = iround(midcol + (double)csign*(islandscape?xy:yx));
icol = min2(hicol,max2(locol,icol)); /* keep icol in bounds */
if ( msgfp!=NULL && msglevel>=49 ) /* debugging */
fprintf(msgfp,"\t...imajor=%d; iminor,quad,irow,icol=%d,%c,%d,%d\n",
imajor,iminor,*qptr,irow,icol);
if ( irow<0 || irow>=rp->height /* row outside raster */
|| icol<0 || icol>=rp->width ) /* col outside raster */
{ isokay = 0; /* signal out-of-bounds pixel */
continue; } /* but still try remaining points */
setpixel(rp,irow,icol,255); /* set pixel at irow,icol */
} /* --- end-of-for(qptr) --- */
} /* --- end-of-for(imajor) --- */
/* ------------------------------------------------------------------------
now do it _again_ along minor axis to avoid "gaps"
------------------------------------------------------------------------- */
if ( 1 && iminor>0 )
for ( iminor=(nminor+1)/2; ; iminor-- )
{
/* --- yx is coord along minor axis, xy is "solved" along major axis --- */
yx = ((double)iminor); /* yx = abminor ... 0 */
if ( yx < 0.0 ) break; /* negative side symmetrical */
xy2 = abmajor2*(1.0 - yx*yx/abminor2); /* "solve" ellipse equation */
xy = (xy2>0.0? sqrt(xy2) : 0.0); /* take sqrt if possible */
imajor = iround(xy); /* nearest integer */
/* --- set pixels for each requested quadrant --- */
for ( qptr=quads; *qptr!='\000'; qptr++ ) /* for each character in quads */
{
rsign = (-1); csign = 1; /* init row,col in user quadrant 1 */
switch ( *qptr ) /* check for quadrant 1,2,3,4 */
{ default: break; /* unrecognized, assume quadrant 1 */
case '4': rsign = 1; break; /* row,col both pos in quadrant 4 */
case '3': rsign = 1; /* row pos, col neg in quadrant 3 */
case '2': csign = (-1); break; } /* row,col both neg in quadrant 2 */
irow = iround(midrow + (double)rsign*(islandscape?yx:xy));
irow = min2(hirow,max2(lorow,irow)); /* keep irow in bounds */
icol = iround(midcol + (double)csign*(islandscape?xy:yx));
icol = min2(hicol,max2(locol,icol)); /* keep icol in bounds */
if ( msgfp!=NULL && msglevel>=49 ) /* debugging */
fprintf(msgfp,"\t...iminor=%d; imajor,quad,irow,icol=%d,%c,%d,%d\n",
iminor,imajor,*qptr,irow,icol);
if ( irow<0 || irow>=rp->height /* row outside raster */
|| icol<0 || icol>=rp->width ) /* col outside raster */
{ isokay = 0; /* signal out-of-bounds pixel */
continue; } /* but still try remaining points */
setpixel(rp,irow,icol,255); /* set pixel at irow,icol */
} /* --- end-of-for(qptr) --- */
} /* --- end-of-for(iminor) --- */
} /* --- end-of-if/else(nmajor<1) --- */
return ( isokay );
} /* --- end-of-function circle_raster() --- */
/* ==========================================================================
* Function: circle_recurse ( rp, row0, col0, row1, col1,
* thickness, theta0, theta1 )
* Purpose: Recursively draws arc theta0<=theta<=theta1 of the ellipse
* in box determined by diagonally opposite corner points
* (row0,col0) and (row1,col1), of thickness pixels in raster rp.
* --------------------------------------------------------------------------
* Arguments: rp (I) raster * to raster in which an ellipse
* will be drawn
* row0 (I) int containing 1st corner row bounding ellipse
* (0 is topmost)
* col0 (I) int containing 1st corner col bounding ellipse
* (0 is leftmost)
* row1 (I) int containing 2nd corner row bounding ellipse
* (rp->height-1 is bottom-most)
* col1 (I) int containing 2nd corner col bounding ellipse
* (rp->width-1 is rightmost)
* thickness (I) int containing number of pixels/bits
* thick the ellipse arc line will be
* theta0 (I) double containing first angle -360 -> +360
* theta1 (I) double containing second angle -360 -> +360
* 0=x-axis, positive moving counterclockwise
* --------------------------------------------------------------------------
* Returns: ( int ) 1 if ellipse drawn okay,
* or 0 for any error.
* --------------------------------------------------------------------------
* Notes: o row0==row1 or col0==col1 are errors
* o using ellipse equation x^2/a^2 + y^2/b^2 = 1
* Then, with x=r*cos(theta), y=r*sin(theta), ellipse
* equation is r = ab/sqrt(a^2*sin^2(theta)+b^2*cos^2(theta))
* ======================================================================= */
/* --- entry point --- */
int circle_recurse ( raster *rp, int row0, int col0,
int row1, int col1, int thickness, double theta0, double theta1 )
{
/* -------------------------------------------------------------------------
Allocations and Declarations
-------------------------------------------------------------------------- */
/* --- lower-left and upper-right bounding points (in our coords) --- */
int lorow = min2(row0,row1), /* lower bounding row (top of box) */
locol = min2(col0,col1), /* lower bounding col (left of box)*/
hirow = max2(row0,row1), /* upper bounding row (bot of box) */
hicol = max2(col0,col1); /* upper bounding col (right of box)*/
/* --- a and b ellipse params --- */
int width = hicol-locol+1, /* width of bounding box */
height= hirow-lorow+1; /* height of bounding box */
double a = ((double)width)/2.0, /* col x=a when row y=0 */
b = ((double)height)/2.0, /* row y=b when col x=0 */
ab=a*b, a2=a*a, b2=b*b; /* product and squares */
/* --- arc parameters --- */
double rads = 0.017453292, /* radians per degree = 1/57.29578 */
lotheta = rads*dmod(min2(theta0,theta1),360), /* smaller angle */
hitheta = rads*dmod(max2(theta0,theta1),360), /* larger angle */
locos=cos(lotheta), losin=sin(lotheta), /* trigs for lotheta */
hicos=cos(hitheta), hisin=sin(hitheta), /* trigs for hitheta */
rlo = ab/sqrt(b2*locos*locos+a2*losin*losin), /* r for lotheta */
rhi = ab/sqrt(b2*hicos*hicos+a2*hisin*hisin), /* r for hitheta */
xlo=rlo*locos, ylo=rlo*losin, /*col,row pixel coords for lotheta*/
xhi=rhi*hicos, yhi=rhi*hisin, /*col,row pixel coords for hitheta*/
xdelta=fabs(xhi-xlo), ydelta=fabs(yhi-ylo), /* col,row deltas */
tolerance = 0.5; /* convergence tolerance */
/* -------------------------------------------------------------------------
recurse if either delta > tolerance
-------------------------------------------------------------------------- */
if ( ydelta > tolerance /* row hasn't converged */
|| xdelta > tolerance ) /* col hasn't converged */
{ double midtheta = 0.5*(theta0+theta1); /* mid angle for arc */
circle_recurse(rp,row0,col0,row1,col1,thickness,theta0,midtheta); /*lo*/
circle_recurse(rp,row0,col0,row1,col1,thickness,midtheta,theta1); }/*hi*/
/* -------------------------------------------------------------------------
draw converged point
-------------------------------------------------------------------------- */
else
{ double xcol=0.5*(xlo+xhi), yrow=0.5*(ylo+yhi), /* relative to center*/
centerrow = 0.5*((double)(lorow+hirow)), /* ellipse y-center */
centercol = 0.5*((double)(locol+hicol)), /* ellipse x-center */
midrow=centerrow-yrow, midcol=centercol+xcol; /* pixel coords */
setpixel(rp,iround(midrow),iround(midcol),255); } /* set midrow,midcol */
return ( 1 );
} /* --- end-of-function circle_recurse() --- */
/* ==========================================================================
* Function: bezier_raster ( rp, r0,c0, r1,c1, rt,ct )
* Purpose: Recursively draw bezier from r0,c0 to r1,c1
* (with tangent point rt,ct) in existing raster rp.
* --------------------------------------------------------------------------
* Arguments: rp (I) raster * to raster in which a line
* will be drawn
* r0 (I) double containing row at which
* bezier will start (0 is topmost)
* c0 (I) double containing col at which
* bezier will start (0 is leftmost)
* r1 (I) double containing row at which
* bezier will end (rp->height-1 is bottom-most)
* c1 (I) double containing col at which
* bezier will end (rp->width-1 is rightmost)
* rt (I) double containing row for tangent point
* ct (I) double containing col for tangent point
* --------------------------------------------------------------------------
* Returns: ( int ) 1 if line drawn okay,
* or 0 for any error.
* --------------------------------------------------------------------------
* Notes: o Recurses, drawing left- and right-halves of bezier curve
* until a point is found
* ======================================================================= */
/* --- entry point --- */
int bezier_raster ( raster *rp, double r0, double c0,
double r1, double c1, double rt, double ct )
{
/* -------------------------------------------------------------------------
Allocations and Declarations
-------------------------------------------------------------------------- */
double delrow = fabs(r1-r0), /* 0 if same row */
delcol = fabs(c1-c0), /* 0 if same col */
tolerance = 0.5; /* draw curve when it goes to point*/
double midrow = 0.5*(r0+r1), /* midpoint row */
midcol = 0.5*(c0+c1); /* midpoint col */
int irow=0, icol=0; /* point to be drawn */
int status = 1; /* return status */
/* -------------------------------------------------------------------------
recurse if either delta > tolerance
-------------------------------------------------------------------------- */
if ( delrow > tolerance /* row hasn't converged */
|| delcol > tolerance ) /* col hasn't converged */
{ bezier_raster(rp, r0,c0, /* left half */
0.5*(rt+midrow), 0.5*(ct+midcol),
0.5*(r0+rt), 0.5*(c0+ct) );
bezier_raster(rp, 0.5*(rt+midrow), 0.5*(ct+midcol), /* right half */
r1,c1,
0.5*(r1+rt), 0.5*(c1+ct) );
return ( 1 ); }
/* -------------------------------------------------------------------------
draw converged point
-------------------------------------------------------------------------- */
/* --- get integer point --- */
irow = iround(midrow); /* row pixel coord */
icol = iround(midcol); /* col pixel coord */
/* --- bounds check --- */
if ( irow>=0 && irow<rp->height /* row in bounds */
&& icol>=0 && icol<rp->width ) /* col in bounds */
setpixel(rp,irow,icol,255); /* so set pixel at irow,icol*/
else status = 0; /* bad status if out-of-bounds */
return ( status );
} /* --- end-of-function bezier_raster() --- */
/* ==========================================================================
* Function: border_raster ( rp, ntop, nbot, isline, isfree )
* Purpose: Allocate a new raster containing a copy of input rp,
* along with ntop extra rows at top and nbot at bottom,
* and whose width is either adjusted correspondingly,
* or is automatically enlarged to a multiple of 8
* with original bitmap centered
* --------------------------------------------------------------------------
* Arguments: rp (I) raster * to raster on which a border
* is to be placed
* ntop (I) int containing number extra rows at top.
* if negative, abs(ntop) used, and same
* number of extra cols added at left.
* nbot (I) int containing number extra rows at bottom.
* if negative, abs(nbot) used, and same
* number of extra cols added at right.
* isline (I) int containing 0 to leave border pixels clear
* or >0 to draw a line around border of width
* isline.
* isfree (I) int containing true to free rp before return
* --------------------------------------------------------------------------
* Returns: ( raster * ) ptr to bordered raster,
* or NULL for any error.
* --------------------------------------------------------------------------
* Notes: o
* ======================================================================= */
/* --- entry point --- */
raster *border_raster ( raster *rp, int ntop, int nbot,
int isline, int isfree )
{
/* -------------------------------------------------------------------------
Allocations and Declarations
-------------------------------------------------------------------------- */
raster *new_raster(), *bp=(raster *)NULL; /*raster back to caller*/
int rastput(); /* overlay rp in new bordered raster */
int width = (rp==NULL?0:rp->width), /* height of raster */
height = (rp==NULL?0:rp->height), /* width of raster */
istopneg=0, isbotneg=0, /* true if ntop or nbot negative */
leftmargin = 0; /* adjust width to whole number of bytes */
int delete_raster(); /* to free input rp if isdelete is true */
/* -------------------------------------------------------------------------
Initialization
-------------------------------------------------------------------------- */
if ( rp == NULL ) goto end_of_job; /* no input raster provided */
if ( isstring || (1 && rp->height==1) ) /* explicit string signal or infer */
{ bp=rp; goto end_of_job; } /* return ascii string unchanged */
/* --- check for negative args --- */
if ( ntop < 0 ) { ntop = -ntop; istopneg=1; } /*flip positive and set flag*/
if ( nbot < 0 ) { nbot = -nbot; isbotneg=1; } /*flip positive and set flag*/
/* --- adjust height for ntop and nbot margins --- */
height += (ntop+nbot); /* adjust height for margins */
/* --- adjust width for left and right margins --- */
if ( istopneg || isbotneg ) /*caller wants nleft=ntop and/or nright=nbot*/
{ /* --- adjust width (and leftmargin) as requested by caller -- */
if ( istopneg ) { width += ntop; leftmargin = ntop; }
if ( isbotneg ) width += nbot; }
else
{ /* --- or adjust width (and leftmargin) to whole number of bytes --- */
leftmargin = (width%8==0? 0 : 8-(width%8)); /*makes width multiple of 8*/
width += leftmargin; /* width now multiple of 8 */
leftmargin /= 2; } /* center original raster */
/* -------------------------------------------------------------------------
allocate bordered raster, and embed rp within it
-------------------------------------------------------------------------- */
/* --- allocate bordered raster --- */
if ( (bp=new_raster(width,height,rp->pixsz)) /*allocate bordered raster*/
== (raster *)NULL ) goto end_of_job; /* and quit if failed */
/* --- embed rp in it --- */
rastput(bp,rp,ntop,leftmargin,1); /* rp embedded in bp */
/* -------------------------------------------------------------------------
draw border if requested
-------------------------------------------------------------------------- */
if ( isline )
{ int irow, icol, nthick=isline; /*height,width index, line thickness*/
/* --- draw left- and right-borders --- */
for ( irow=0; irow<height; irow++ ) /* for each row of bp */
for ( icol=0; icol<nthick; icol++ ) /* and each pixel of thickness */
{ setpixel(bp,irow,icol,255); /* left border */
setpixel(bp,irow,width-1-icol,255); } /* right border */
/* --- draw top- and bottom-borders --- */
for ( icol=0; icol<width; icol++ ) /* for each col of bp */
for ( irow=0; irow<nthick; irow++ ) /* and each pixel of thickness */
{ setpixel(bp,irow,icol,255); /* top border */
setpixel(bp,height-1-irow,icol,255); } /* bottom border */
} /* --- end-of-if(isline) --- */
/* -------------------------------------------------------------------------
free rp if no longer needed
-------------------------------------------------------------------------- */
if ( isfree ) /*caller no longer needs rp*/
delete_raster(rp); /* so free it for him */
/* -------------------------------------------------------------------------
Back to caller with bordered raster (or null for any error)
-------------------------------------------------------------------------- */
end_of_job:
return ( bp ); /* back with bordered or null ptr */
} /* --- end-of-function border_raster() --- */
/* ==========================================================================
* Function: type_raster ( rp, fp )
* Purpose: Emit an ascii dump representing rp, on fp.
* --------------------------------------------------------------------------
* Arguments: rp (I) ptr to raster struct for which an
* ascii dump is to be constructed.
* fp (I) File ptr to output device (defaults to
* stdout if passed as NULL).
* --------------------------------------------------------------------------
* Returns: ( int ) 1 if completed successfully,
* or 0 otherwise (for any error).
* --------------------------------------------------------------------------
* Notes:
* ======================================================================= */
/* --- entry point --- */
int type_raster ( raster *rp, FILE *fp )
{
/* -------------------------------------------------------------------------
Allocations and Declarations
-------------------------------------------------------------------------- */
static int display_width = 72; /* max columns for display */
static char display_chars[16] = /* display chars for bytemap */
{ ' ','1','2','3','4','5','6','7','8','9','A','B','C','D','E','*' };
char scanline[133]; /* ascii image for one scan line */
int scan_width; /* #chars in scan (<=display_width)*/
int irow, locol,hicol=(-1); /* height index, width indexes */
raster *gftobitmap(), *bitmaprp=rp; /* convert .gf to bitmap if needed */
int delete_raster(); /*free bitmap converted for display*/
/* --------------------------------------------------------------------------
initialization
-------------------------------------------------------------------------- */
/* --- redirect null fp --- */
if ( fp == (FILE *)NULL ) fp = stdout; /* default fp to stdout if null */
/* --- check for ascii string --- */
if ( isstring /* pixmap has string, not raster */
|| (0 && rp->height==1) ) /* infer input rp is a string */
{
char *string = (char *)(rp->pixmap); /*interpret pixmap as ascii string*/
int width = strlen(string); /* #chars in ascii string */
while ( width > display_width-2 ) /* too big for one line */
{ fprintf(fp,"\"%.*s\"\n",display_width-2,string); /*display leading chars*/
string += (display_width-2); /* bump string past displayed chars*/
width -= (display_width-2); } /* decrement remaining width */
fprintf(fp,"\"%.*s\"\n",width,string); /* display trailing chars */
return ( 1 );
} /* --- end-of-if(isstring) --- */
/* --------------------------------------------------------------------------
display ascii dump of bitmap image (in segments if display_width < rp->width)
-------------------------------------------------------------------------- */
if ( rp->format == 2 /* input is .gf-formatted */
|| rp->format == 3 )
bitmaprp = gftobitmap(rp); /* so convert it for display */
if ( bitmaprp != NULL ) /* if we have image for display */
while ( (locol=hicol+1) < rp->width ) /*start where prev segment left off*/
{
/* --- set hicol for this pass (locol set above) --- */
hicol += display_width; /* show as much as display allows */
if (hicol >= rp->width) hicol = rp->width - 1; /*but not more than raster*/
scan_width = hicol-locol+1; /* #chars in this scan */
if ( locol > 0 ) fprintf(fp,"----------\n"); /*separator between segments*/
/* ------------------------------------------------------------------------
display all scan lines for this local...hicol segment range
------------------------------------------------------------------------ */
for ( irow=0; irow<rp->height; irow++ ) /* all scan lines for col range */
{
/* --- allocations and declarations --- */
int ipix, /* pixmap[] index for this scan */
lopix = irow*rp->width + locol; /*first pixmap[] pixel in this scan*/
/* --- set chars in scanline[] based on pixels in rp->pixmap[] --- */
for ( ipix=0; ipix<scan_width; ipix++ ) /* set each char */
if ( bitmaprp->pixsz == 1 ) /*' '=0 or '*'=1 to display bitmap*/
scanline[ipix]=(getlongbit(bitmaprp->pixmap,lopix+ipix)==1? '*':'.');
else /* should have a bytemap */
if ( bitmaprp->pixsz == 8 ) /* double-check pixsz for bytemap */
{ int pixval = (int)((bitmaprp->pixmap)[lopix+ipix]), /*byte value*/
ichar = min2(15,pixval/16); /* index for ' ', '1'...'e', '*' */
scanline[ipix] = display_chars[ichar]; } /*set ' ' for 0-15, etc*/
/* --- display completed scan line --- */
fprintf(fp,"%.*s\n",scan_width,scanline);
} /* --- end-of-for(irow) --- */
} /* --- end-of-while(hicol<rp->width) --- */
/* -------------------------------------------------------------------------
Back to caller with 1=okay, 0=failed.
-------------------------------------------------------------------------- */
if ( rp->format == 2 /* input was .gf-format */
|| rp->format == 3 )
if ( bitmaprp != NULL ) /* and we converted it for display */
delete_raster(bitmaprp); /* no longer needed, so free it */
return ( 1 );
} /* --- end-of-function type_raster() --- */
/* ==========================================================================
* Function: type_bytemap ( bp, grayscale, width, height, fp )
* Purpose: Emit an ascii dump representing bp, on fp.
* --------------------------------------------------------------------------
* Arguments: bp (I) intbyte * to bytemap for which an
* ascii dump is to be constructed.
* grayscale (I) int containing #gray shades, 256 for 8-bit
* width (I) int containing #cols in bytemap
* height (I) int containing #rows in bytemap
* fp (I) File ptr to output device (defaults to
* stdout if passed as NULL).
* --------------------------------------------------------------------------
* Returns: ( int ) 1 if completed successfully,
* or 0 otherwise (for any error).
* --------------------------------------------------------------------------
* Notes:
* ======================================================================= */
/* --- entry point --- */
int type_bytemap ( intbyte *bp, int grayscale,
int width, int height, FILE *fp )
{
/* -------------------------------------------------------------------------
Allocations and Declarations
-------------------------------------------------------------------------- */
static int display_width = 72; /* max columns for display */
int byte_width = 3, /* cols to display byte (ff+space) */
maxbyte = 0; /* if maxbyte<16, set byte_width=2 */
int white_byte = 0, /* show dots for white_byte's */
black_byte = grayscale-1; /* show stars for black_byte's */
char scanline[133]; /* ascii image for one scan line */
int scan_width, /* #chars in scan (<=display_width)*/
scan_cols; /* #cols in scan (hicol-locol+1) */
int ibyte, /* bp[] index */
irow, locol,hicol=(-1); /* height index, width indexes */
/* --------------------------------------------------------------------------
initialization
-------------------------------------------------------------------------- */
/* --- redirect null fp --- */
if ( fp == (FILE *)NULL ) fp = stdout; /* default fp to stdout if null */
/* --- check for ascii string --- */
if ( isstring ) /* bp has ascii string, not raster */
{ width = strlen((char *)bp); /* #chars in ascii string */
height = 1; } /* default */
/* --- see if we can get away with byte_width=1 --- */
for ( ibyte=0; ibyte<width*height; ibyte++ ) /* check all bytes */
{ int byteval = (int)bp[ibyte]; /* current byte value */
if ( byteval < black_byte ) /* if it's less than black_byte */
maxbyte = max2(maxbyte,byteval); } /* then find max non-black value */
if ( maxbyte < 16 ) /* bytevals will fit in one column */
byte_width = 1; /* so reset display byte_width */
/* --------------------------------------------------------------------------
display ascii dump of bitmap image (in segments if display_width < rp->width)
-------------------------------------------------------------------------- */
while ( (locol=hicol+1) < width ) /*start where prev segment left off*/
{
/* --- set hicol for this pass (locol set above) --- */
hicol += display_width/byte_width; /* show as much as display allows */
if (hicol >= width) hicol = width - 1; /* but not more than bytemap */
scan_cols = hicol-locol+1; /* #cols in this scan */
scan_width = byte_width*scan_cols; /* #chars in this scan */
if ( locol>0 && !isstring ) fprintf(fp,"----------\n"); /* separator */
/* ------------------------------------------------------------------------
display all scan lines for this local...hicol segment range
------------------------------------------------------------------------ */
for ( irow=0; irow<height; irow++ ) /* all scan lines for col range */
{
/* --- allocations and declarations --- */
int lobyte = irow*width + locol; /* first bp[] byte in this scan */
char scanbyte[32]; /* sprintf() buffer for byte */
/* --- set chars in scanline[] based on bytes in bytemap bp[] --- */
memset(scanline,' ',scan_width); /* blank out scanline */
for ( ibyte=0; ibyte<scan_cols; ibyte++ ) /* set chars for each col */
{ int byteval = (int)bp[lobyte+ibyte]; /* value of current byte */
memset(scanbyte,'.',byte_width); /* dot-fill scanbyte */
if ( byteval == black_byte ) /* but if we have a black byte */
memset(scanbyte,'*',byte_width); /* star-fill scanbyte instead */
if ( byte_width > 1 ) /* don't blank out single char */
scanbyte[byte_width-1] = ' '; /* blank-fill rightmost character */
if ( byteval != white_byte /* format bytes that are non-white */
&& byteval != black_byte ) /* and that are non-black */
sprintf(scanbyte,"%*x ",max2(1,byte_width-1),byteval); /*hex-format*/
memcpy(scanline+ibyte*byte_width,scanbyte,byte_width); } /*in line*/
/* --- display completed scan line --- */
fprintf(fp,"%.*s\n",scan_width,scanline);
} /* --- end-of-for(irow) --- */
} /* --- end-of-while(hicol<width) --- */
/* -------------------------------------------------------------------------
Back to caller with 1=okay, 0=failed.
-------------------------------------------------------------------------- */
return ( 1 );
} /* --- end-of-function type_bytemap() --- */
/* ==========================================================================
* Function: xbitmap_raster ( rp, fp )
* Purpose: Emit a mime xbitmap representing rp, on fp.
* --------------------------------------------------------------------------
* Arguments: rp (I) ptr to raster struct for which a mime
* xbitmap is to be constructed.
* fp (I) File ptr to output device (defaults to
* stdout if passed as NULL).
* --------------------------------------------------------------------------
* Returns: ( int ) 1 if completed successfully,
* or 0 otherwise (for any error).
* --------------------------------------------------------------------------
* Notes:
* ======================================================================= */
/* --- entry point --- */
int xbitmap_raster ( raster *rp, FILE *fp )
{
/* -------------------------------------------------------------------------
Allocations and Declarations
-------------------------------------------------------------------------- */
char *title = "image"; /* dummy title */
int hex_bitmap(); /* dump bitmap as hex bytes */
/* --------------------------------------------------------------------------
emit text to display mime xbitmap representation of rp->bitmap image
-------------------------------------------------------------------------- */
/* --- first redirect null fp --- */
if ( fp == (FILE *)NULL ) fp = stdout; /* default fp to stdout if null */
/* --- check for ascii string --- */
if ( isstring ) /* pixmap has string, not raster */
return ( 0 ); /* can't handle ascii string */
/* --- emit prologue strings and hex dump of bitmap for mime xbitmap --- */
fprintf( fp, "Content-type: image/x-xbitmap\n\n" );
fprintf( fp, "#define %s_width %d\n#define %s_height %d\n",
title,rp->width, title,rp->height );
fprintf( fp, "static char %s_bits[] = {\n", title );
hex_bitmap(rp,fp,0,0); /* emit hex dump of bitmap bytes */
fprintf (fp,"};\n"); /* ending with "};" for C array */
/* -------------------------------------------------------------------------
Back to caller with 1=okay, 0=failed.
-------------------------------------------------------------------------- */
return ( 1 );
} /* --- end-of-function xbitmap_raster() --- */
/* ==========================================================================
* Function: type_pbmpgm ( rp, ptype, file )
* Purpose: Write pbm or pgm image of rp to file
* --------------------------------------------------------------------------
* Arguments: rp (I) ptr to raster struct for which
* a pbm/pgm file is to be written.
* ptype (I) int containing 1 for pbm, 2 for pgm, or
* 0 to determine ptype from values in rp
* file (I) ptr to null-terminated char string
* containing name of fuke to be written
* (see notes below).
* --------------------------------------------------------------------------
* Returns: ( int ) total #bytes written,
* or 0 for any error.
* --------------------------------------------------------------------------
* Notes: o (a) If file==NULL, output is written to stdout;
* (b) if *file=='\000' then file is taken as the
* address of an output buffer to which output
* is written (and is followed by a terminating
* '\0' which is not counted in #bytes returned);
* (c) otherwise file is the filename (opened and
* closed internally) to which output is written,
* except that any final .ext extension is replaced
* by .pbm or .pgm depending on ptype.
* ======================================================================= */
/* --- entry point --- */
int type_pbmpgm ( raster *rp, int ptype, char *file )
{
/* -------------------------------------------------------------------------
Allocations and Declarations
-------------------------------------------------------------------------- */
int isokay=0, nbytes=0; /* completion flag, total #bytes written */
int irow=0, jcol=0; /*height(row), width(col) indexes in raster*/
int pixmin=9999, pixmax=(-9999), /* min, max pixel value in raster */
ngray = 0; /* #gray scale values */
FILE /* *fopen(), */ *fp=NULL; /* pointer to output file (or NULL) */
char outline[1024], outfield[256], /* output line, field */
cr[16] = "\n\000"; /* cr at end-of-line */
int maxlinelen = 70; /* maximum allowed line length */
int pixfrac=6; /* use (pixmax-pixmin)/pixfrac as step */
static char
*suffix[] = { NULL, ".pbm", ".pgm" }, /* file.suffix[ptype] */
*magic[] = { NULL, "P1", "P2" }, /*identifying "magic number"*/
*mode[] = { NULL, "w", "w" }; /* fopen() mode[ptype] */
/* -------------------------------------------------------------------------
check input, determine grayscale, and set up output file if necessary
-------------------------------------------------------------------------- */
/* --- check input args --- */
if ( rp == NULL ) goto end_of_job; /* no input raster provided */
if ( ptype != 0 ) /* we'll determine ptype below */
if ( ptype<1 || ptype>2 ) goto end_of_job; /*invalid output graphic format*/
/* --- determine largest (and smallest) value in pixmap --- */
for ( irow=0; irow<rp->height; irow++ ) /* for each row, top-to-bottom */
for ( jcol=0; jcol<rp->width; jcol++ ) /* for each col, left-to-right */
{ int pixval = getpixel(rp,irow,jcol); /* value of pixel at irow,jcol */
pixmin = min2(pixmin,pixval); /* new minimum */
pixmax = max2(pixmax,pixval); } /* new maximum */
ngray = 1 + (pixmax-pixmin); /* should be 2 for b/w bitmap */
if ( ptype == 0 ) /* caller wants us to set ptype */
ptype = (ngray>=3?2:1); /* use grayscale if >2 shades */
/* --- open output file if necessary --- */
if ( file == NULL ) fp = stdout; /*null ptr signals output to stdout*/
else if ( *file != '\000' ) { /* explicit filename provided, so...*/
char fname[512], *pdot=NULL; /* file.ext, ptr to last . in fname*/
strncpy(fname,file,255); /* local copy of file name */
fname[255] = '\000'; /* make sure it's null terminated */
if ( (pdot=strrchr(fname,'.')) == NULL ) /*no extension on original name*/
strcat(fname,suffix[ptype]); /* so add extension */
else /* we already have an extension */
strcpy(pdot,suffix[ptype]); /* so replace original extension */
if ( (fp = fopen(fname,mode[ptype])) /* open output file */
== (FILE *)NULL ) goto end_of_job; /* quit if failed to open */
} /* --- ens-of-if(*file!='\0') --- */
/* -------------------------------------------------------------------------
format and write header
-------------------------------------------------------------------------- */
/* --- format header info --- */
*outline = '\000'; /* initialize line buffer */
strcat(outline,magic[ptype]); /* begin file with "magic number" */
strcat(outline,cr); /* followed by cr to end line */
sprintf(outfield,"%d %d",rp->width,rp->height); /* format width and height */
strcat(outline,outfield); /* add width and height to header */
strcat(outline,cr); /* followed by cr to end line */
if ( ptype == 2 ) /* need max grayscale value */
{ sprintf(outfield,"%d",pixmax); /* format maximum pixel value */
strcat(outline,outfield); /* add max value to header */
strcat(outline,cr); } /* followed by cr to end line */
/* --- write header to file or memory buffer --- */
if ( fp == NULL ) /* if we have no open file... */
strcat(file,outline); /* add header to caller's buffer */
else /* or if we have an open file... */
if ( fputs(outline,fp) /* try writing header to open file */
== EOF ) goto end_of_job; /* return with error if failed */
nbytes += strlen(outline); /* bump output byte count */
/* -------------------------------------------------------------------------
format and write pixels
-------------------------------------------------------------------------- */
*outline = '\000'; /* initialize line buffer */
for ( irow=0; irow<=rp->height; irow++ ) /* for each row, top-to-bottom */
for ( jcol=0; jcol<rp->width; jcol++ ) { /* for each col, left-to-right */
/* --- format value at irow,jcol--- */
*outfield = '\000'; /* init empty field */
if ( irow < rp->height ) { /* check row index */
int pixval = getpixel(rp,irow,jcol); /* value of pixel at irow,jcol */
if ( ptype == 1 ) /* pixval must be 1 or 0 */
pixval = (pixval>pixmin+((pixmax-pixmin)/pixfrac)?1:0);
sprintf(outfield,"%d ",pixval); } /* format pixel value */
/* --- write line if this value won't fit on it (or last line) --- */
if ( strlen(outline)+strlen(outfield)+strlen(cr) >= maxlinelen /*won't fit*/
|| irow >= rp->height ) { /* force writing last line */
strcat(outline,cr); /* add cr to end current line */
if ( fp == NULL ) /* if we have no open file... */
strcat(file,outline); /* add header to caller's buffer */
else /* or if we have an open file... */
if ( fputs(outline,fp) /* try writing header to open file */
== EOF ) goto end_of_job; /* return with error if failed */
nbytes += strlen(outline); /* bump output byte count */
*outline = '\000'; /* re-initialize line buffer */
} /* --- end-of-if(strlen>=maxlinelen) --- */
if ( irow >= rp->height ) break; /* done after writing last line */
/* --- concatanate value to line -- */
strcat(outline,outfield); /* concatanate value to line */
} /* --- end-of-for(jcol,irow) --- */
isokay = 1; /* signal successful completion */
/* -------------------------------------------------------------------------
Back to caller with total #bytes written, or 0=failed.
-------------------------------------------------------------------------- */
end_of_job:
if ( fp != NULL /* output written to an open file */
&& fp != stdout ) /* and it's not just stdout */
fclose(fp); /* so close file before returning */
return ( (isokay?nbytes:0) ); /*back to caller with #bytes written*/
} /* --- end-of-function type_pbmpgm() --- */
/* ==========================================================================
* Function: cstruct_chardef ( cp, fp, col1 )
* Purpose: Emit a C struct of cp on fp, starting in col1.
* --------------------------------------------------------------------------
* Arguments: cp (I) ptr to chardef struct for which
* a C struct is to be generated.
* fp (I) File ptr to output device (defaults to
* stdout if passed as NULL).
* col1 (I) int containing 0...65; output lines
* are preceded by col1 blanks.
* --------------------------------------------------------------------------
* Returns: ( int ) 1 if completed successfully,
* or 0 otherwise (for any error).
* --------------------------------------------------------------------------
* Notes:
* ======================================================================= */
/* --- entry point --- */
int cstruct_chardef ( chardef *cp, FILE *fp, int col1 )
{
/* -------------------------------------------------------------------------
Allocations and Declarations
-------------------------------------------------------------------------- */
char field[64]; /* field within output line */
int cstruct_raster(), /* emit a raster */
emit_string(); /* emit a string and comment */
/* -------------------------------------------------------------------------
emit charnum, location, name / hirow, hicol, lorow, locol
-------------------------------------------------------------------------- */
/* --- charnum, location, name --- */
sprintf(field,"{ %3d,%5d,\n", cp->charnum,cp->location); /*char#,location*/
emit_string ( fp, col1, field, "character number, location");
/* --- toprow, topleftcol, botrow, botleftcol --- */
sprintf(field," %3d,%2d, %3d,%2d,\n", /* format... */
cp->toprow,cp->topleftcol, /* toprow, topleftcol, */
cp->botrow,cp->botleftcol); /* and botrow, botleftcol */
emit_string ( fp, col1, field, "topleft row,col, and botleft row,col");
/* -------------------------------------------------------------------------
emit raster and chardef's closing brace, and then return to caller
-------------------------------------------------------------------------- */
cstruct_raster(&cp->image,fp,col1+4); /* emit raster */
emit_string ( fp, 0, " }", NULL); /* emit closing brace */
return ( 1 ); /* back to caller with 1=okay, 0=failed */
} /* --- end-of-function cstruct_chardef() --- */
/* ==========================================================================
* Function: cstruct_raster ( rp, fp, col1 )
* Purpose: Emit a C struct of rp on fp, starting in col1.
* --------------------------------------------------------------------------
* Arguments: rp (I) ptr to raster struct for which
* a C struct is to be generated.
* fp (I) File ptr to output device (defaults to
* stdout if passed as NULL).
* col1 (I) int containing 0...65; output lines
* are preceded by col1 blanks.
* --------------------------------------------------------------------------
* Returns: ( int ) 1 if completed successfully,
* or 0 otherwise (for any error).
* --------------------------------------------------------------------------
* Notes:
* ======================================================================= */
/* --- entry point --- */
int cstruct_raster ( raster *rp, FILE *fp, int col1 )
{
/* -------------------------------------------------------------------------
Allocations and Declarations
-------------------------------------------------------------------------- */
char field[64]; /* field within output line */
char typecast[64] = "(pixbyte *)"; /* type cast for pixmap string */
int hex_bitmap(); /* to emit raster bitmap */
int emit_string(); /* emit a string and comment */
/* -------------------------------------------------------------------------
emit width and height
-------------------------------------------------------------------------- */
sprintf(field,"{ %2d, %3d,%2d,%2d, %s\n", /* format width,height,pixsz */
rp->width,rp->height,rp->format,rp->pixsz,typecast);
emit_string ( fp, col1, field, "width,ht, fmt,pixsz,map...");
/* -------------------------------------------------------------------------
emit bitmap and closing brace, and return to caller
-------------------------------------------------------------------------- */
hex_bitmap(rp,fp,col1+2,1); /* emit bitmap */
emit_string ( fp, 0, " }", NULL); /* emit closing brace */
return ( 1 ); /* back to caller with 1=okay, 0=failed */
} /* --- end-of-function cstruct_raster() --- */
/* ==========================================================================
* Function: hex_bitmap ( rp, fp, col1, isstr )
* Purpose: Emit a hex dump of the bitmap of rp on fp, starting in col1.
* If isstr (is string) is true, the dump is of the form
* "\x01\x02\x03\x04\x05..."
* Otherwise, if isstr is false, the dump is of the form
* 0x01,0x02,0x03,0x04,0x05...
* --------------------------------------------------------------------------
* Arguments: rp (I) ptr to raster struct for which
* a hex dump is to be constructed.
* fp (I) File ptr to output device (defaults to
* stdout if passed as NULL).
* col1 (I) int containing 0...65; output lines
* are preceded by col1 blanks.
* isstr (I) int specifying dump format as described above
* --------------------------------------------------------------------------
* Returns: ( int ) 1 if completed successfully,
* or 0 otherwise (for any error).
* --------------------------------------------------------------------------
* Notes:
* ======================================================================= */
/* --- entry point --- */
int hex_bitmap ( raster *rp, FILE *fp, int col1, int isstr )
{
/* -------------------------------------------------------------------------
Allocations and Declarations
-------------------------------------------------------------------------- */
int ibyte, /* pixmap[ibyte] index */
nbytes = pixbytes(rp); /*#bytes in bitmap or .gf-formatted*/
char stub[64]=" ";/* col1 leading blanks */
int linewidth = 64, /* (roughly) rightmost column */
colwidth = (isstr? 4:5); /* #cols required for each byte */
int ncols = (linewidth-col1)/colwidth; /* new line after ncols bytes */
/* --------------------------------------------------------------------------
initialization
-------------------------------------------------------------------------- */
/* --- redirect null fp --- */
if ( fp == (FILE *)NULL ) fp = stdout; /* default fp to stdout if null */
/* --- emit initial stub if wanted --- */
if ( col1 > 0 ) fprintf(fp,"%.*s",col1,stub); /* stub preceding 1st line */
/* --------------------------------------------------------------------------
emit hex dump of rp->bitmap image
-------------------------------------------------------------------------- */
if ( isstr ) fprintf(fp,"\""); /* opening " before first line */
for ( ibyte=0; ibyte<nbytes; ibyte++ ) /* one byte at a time */
{
/* --- display a byte as hex char or number, depending on isstr --- */
if ( isstr ) /* string format wanted */
fprintf(fp,"\\x%02x",(rp->pixmap)[ibyte]); /*print byte as hex char*/
else /* comma-separated format wanted */
fprintf(fp,"0x%02x",(rp->pixmap)[ibyte]); /*print byte as hex number*/
/* --- add a separator and newline, etc, as necessary --- */
if ( ibyte < nbytes-1) /* not the last byte yet */
{
if ( !isstr ) fprintf(fp,","); /* follow hex number with comma */
if ( (ibyte+1)%ncols==0 ) /* need new line after every ncols */
if ( !isstr ) /* for hex numbers format ... */
fprintf(fp,"\n%.*s",col1,stub); /* ...just need newline and stub */
else /* for string format... */
fprintf(fp,"\"\n%.*s\"",col1,stub); /* ...need closing, opening "s */
} /* --- end-of-if(ibyte<nbytes-1) --- */
} /* --- end-of-for(ibyte) --- */
if ( isstr ) fprintf(fp,"\""); /* closing " after last line */
return ( 1 ); /* back with 1=okay, 0=failed */
} /* --- end-of-function hex_bitmap() --- */
/* ==========================================================================
* Function: emit_string ( fp, col1, string, comment )
* Purpose: Emit string on fp, starting in col1,
* and followed by right-justified comment.
* --------------------------------------------------------------------------
* Arguments: fp (I) File ptr to output device (defaults to
* stdout if passed as NULL).
* col1 (I) int containing 0 or #blanks preceding string
* string (I) char * containing string to be emitted.
* If last char of string is '\n',
* the emitted line ends with a newline,
* otherwise not.
* comment (I) NULL or char * containing right-justified
* comment (we enclose between /star and star/)
* --------------------------------------------------------------------------
* Returns: ( int ) 1 if completed successfully,
* or 0 otherwise (for any error).
* --------------------------------------------------------------------------
* Notes: o
* ======================================================================= */
/* --- entry point --- */
int emit_string ( FILE *fp, int col1, char *string, char *comment )
{
/* -------------------------------------------------------------------------
Allocations and Declarations
-------------------------------------------------------------------------- */
char line[256]; /* construct line with caller's fields */
int fieldlen; /* #chars in one of caller's fields */
int linelen = 72; /*line length (for right-justified comment)*/
int isnewline = 0; /* true to emit \n at end of line */
/* --------------------------------------------------------------------------
construct line containing prolog, string, epilog, and finally comment
-------------------------------------------------------------------------- */
/* --- init line --- */
memset(line,' ',255); /* start line with blanks */
/* --- embed string into line --- */
if ( string != NULL ) /* if caller gave us a string... */
{ fieldlen = strlen(string); /* #cols required for string */
if ( string[fieldlen-1] == '\n' ) /* check last char for newline */
{ isnewline = 1; /* got it, so set flag */
fieldlen--; } /* but don't print it yet */
memcpy(line+col1,string,fieldlen); /* embid string starting at col1 */
col1 += fieldlen; } /* bump col past epilog */
/* --- embed comment into line --- */
if ( comment != NULL ) /* if caller gave us a comment... */
{ fieldlen = 6 + strlen(comment); /* plus /star, star/, 2 spaces */
if ( linelen-fieldlen < col1 ) /* comment won't fit */
fieldlen -= (col1 - (linelen-fieldlen)); /* truncate comment to fit */
if ( fieldlen > 6 ) /* can fit all or part of comment */
sprintf(line+linelen-fieldlen,"/%c %.*s %c/", /* so embed it in line */
'*', fieldlen-6,comment, '*');
col1 = linelen; } /* indicate line filled */
/* --- line completed --- */
line[col1] = '\000'; /* null-terminate completed line */
/* -------------------------------------------------------------------------
emit line, then back to caller with 1=okay, 0=failed.
-------------------------------------------------------------------------- */
/* --- first redirect null fp --- */
if ( fp == (FILE *)NULL ) fp = stdout; /* default fp to stdout if null */
/* --- emit line (and optional newline) --- */
fprintf(fp,"%.*s",linelen,line); /* no more than linelen chars */
if ( isnewline ) fprintf(fp,"\n"); /*caller wants terminating newline*/
return ( 1 );
} /* --- end-of-function emit_string() --- */
/* ==========================================================================
* Function: gftobitmap ( gf )
* Purpose: convert .gf-like pixmap to bitmap image
* --------------------------------------------------------------------------
* Arguments: gf (I) raster * to struct in .gf-format
* --------------------------------------------------------------------------
* Returns: ( raster * ) image-format raster * if successful,
* or NULL for any error.
* --------------------------------------------------------------------------
* Notes: o
* ======================================================================= */
/* --- entry point --- */
raster *gftobitmap ( raster *gf )
{
/* -------------------------------------------------------------------------
Allocations and Declarations
-------------------------------------------------------------------------- */
raster *new_raster(), *rp=NULL; /* image raster retuned to caller */
int width=0, height=0, totbits=0; /* gf->width, gf->height, #bits */
int format=0, icount=0, ncounts=0, /*.gf format, count index, #counts*/
ibit=0, bitval=0; /* bitmap index, bit value */
int isrepeat = 1, /* true to process repeat counts */
repeatcmds[2] = {255,15}, /*opcode for repeat/duplicate count*/
nrepeats=0, irepeat=0, /* scan line repeat count,index */
wbits = 0; /* count bits to width of scan line*/
/* -------------------------------------------------------------------------
initialization
-------------------------------------------------------------------------- */
/* --- check args --- */
if ( gf == NULL ) goto end_of_job; /* input raster not provided */
format = gf->format; /* 2 or 3 */
if ( format!=2 && format!=3 ) goto end_of_job; /* invalid raster format */
ncounts = gf->pixsz; /*pixsz is really #counts in pixmap*/
/* --- allocate output raster with proper dimensions for bitmap --- */
width=gf->width; height=gf->height; /* dimensions of raster */
if ( (rp = new_raster(width,height,1)) /* allocate new raster and bitmap */
== NULL ) goto end_of_job; /* quit if failed to allocate */
totbits = width*height; /* total #bits in image */
/* -------------------------------------------------------------------------
fill bitmap
-------------------------------------------------------------------------- */
for ( icount=0,bitval=0; icount<ncounts; icount++ )
{
int nbits = (int)(getbyfmt(format,gf->pixmap,icount)); /*#bits to set*/
if ( isrepeat /* we're proxessing repeat counts */
&& nbits == repeatcmds[format-2] ) /* and repeat opcode found */
if ( nrepeats == 0 ) /* recursive repeat is error */
{ nrepeats = (int)(getbyfmt(format,gf->pixmap,icount+1));/*repeat count*/
nbits = (int)(getbyfmt(format,gf->pixmap,icount+2)); /*#bits to set*/
icount += 2; } /* bump byte/nibble count */
else /* some internal error occurred */
if ( msgfp!=NULL && msglevel>=1 ) /* report error */
fprintf(msgfp,"gftobitmap> found embedded repeat command\n");
if ( 0 )
fprintf(stdout,
"gftobitmap> icount=%d bitval=%d nbits=%d ibit=%d totbits=%d\n",
icount,bitval,nbits,ibit,totbits);
for ( ; nbits>0; nbits-- ) /* count down */
{ if ( ibit >= totbits ) goto end_of_job; /* overflow check */
for ( irepeat=0; irepeat<=nrepeats; irepeat++ )
if ( bitval == 1 ) /* set pixel */
{ setlongbit(rp->pixmap,(ibit+irepeat*width)); }
else /* clear pixel */
{ unsetlongbit(rp->pixmap,(ibit+irepeat*width)); }
if ( nrepeats > 0 ) wbits++; /* count another repeated bit */
ibit++; } /* bump bit index */
bitval = 1-bitval; /* flip bit value */
if ( wbits >= width ) { /* completed repeats */
ibit += nrepeats*width; /*bump bit count past repeated scans*/
if ( wbits > width ) /* out-of alignment error */
if ( msgfp!=NULL && msglevel>=1 ) /* report error */
fprintf(msgfp,"gftobitmap> width=%d wbits=%d\n",width,wbits);
wbits = nrepeats = 0; } /* reset repeat counts */
} /* --- end-of-for(icount) --- */
end_of_job:
return ( rp ); /* back to caller with image */
} /* --- end-of-function gftobitmap() --- */
/* ==========================================================================
* Function: get_symdef ( symbol )
* Purpose: returns mathchardef struct for symbol
* --------------------------------------------------------------------------
* Arguments: symbol (I) char * containing symbol
* whose corresponding mathchardef is wanted
* --------------------------------------------------------------------------
* Returns: ( mathchardef * ) pointer to struct defining symbol,
* or NULL for any error
* --------------------------------------------------------------------------
* Notes: o Input symbol need only contain a leading substring to match,
* e.g., \gam passed in symbol will match \gamma in the table.
* If the table contains two or more possible matches,
* the shortest is returned, e.g., input \e will return with
* data for \eta rather than \epsilon. To get \epsilon,
* you must pass a leading substring long enough to eliminate
* shorter table matches, i.e., in this case \ep
* ======================================================================= */
/* --- entry point --- */
mathchardef *get_symdef ( char *symbol )
{
/* -------------------------------------------------------------------------
Allocations and Declarations
-------------------------------------------------------------------------- */
mathchardef *symdefs = symtable; /* table of mathchardefs */
int idef = 0, /* symdefs[] index */
bestdef = (-9999); /*index of shortest matching symdef*/
int symlen = strlen(symbol), /* length of input symbol */
deflen, minlen=9999; /*length of shortest matching symdef*/
int /*alnumsym = (symlen==1 && isalnum(*symbol)),*/ /*alphanumeric sym*/
alphasym = (symlen==1 && isalpha(*symbol)); /* or alpha symbol */
int family = fontinfo[fontnum].family; /* current font family */
static char *displaysyms[][2] = { /*xlate to Big sym for \displaystyle*/
/* --- see table on page 536 in TLC2 --- */
{"\\int", "\\Bigint"},
{"\\oint", "\\Bigoint"},
{"\\sum", "\\Bigsum"},
{"\\prod", "\\Bigprod"},
{"\\coprod", "\\Bigcoprod"},
/* --- must be 'big' when related to similar binary operators --- */
{"\\bigcup", "\\Bigcup"},
{"\\bigsqcup", "\\Bigsqcup"},
{"\\bigcap", "\\Bigcap"},
/*{"\\bigsqcap", "\\sqcap"},*/ /* don't have \Bigsqcap */
{"\\bigodot", "\\Bigodot"},
{"\\bigoplus", "\\Bigoplus"},
{"\\bigominus", "\\ominus"},
{"\\bigotimes", "\\Bigotimes"},
{"\\bigoslash", "\\oslash"},
{"\\biguplus", "\\Biguplus"},
{"\\bigwedge", "\\Bigwedge"},
{"\\bigvee", "\\Bigvee"},
{NULL, NULL} };
/* -------------------------------------------------------------------------
If in \displaystyle mode, first xlate int to Bigint, etc.
-------------------------------------------------------------------------- */
if ( isdisplaystyle > 1 ) /* we're in \displaystyle mode */
for ( idef=0; ; idef++ ) { /* lookup symbol in displaysyms */
char *fromsym = displaysyms[idef][0], /* look for this symbol */
*tosym = displaysyms[idef][1]; /* and xlate it to this symbol */
if ( fromsym == NULL ) break; /* end-of-table */
if ( !strcmp(symbol,fromsym) ) /* found a match */
{ if ( msglevel>=99 && msgfp!=NULL ) /* debugging output */
{ fprintf(msgfp,"get_symdef> isdisplaystyle=%d, xlated %s to %s\n",
isdisplaystyle,symbol,tosym); fflush(msgfp); }
symbol = tosym; /* so look up tosym instead */
symlen = strlen(symbol); /* reset symbol length */
break; } /* no need to search further */
} /* --- end-of-for(idef) --- */
/* -------------------------------------------------------------------------
search symdefs[] in order for first occurrence of symbol
-------------------------------------------------------------------------- */
for ( idef=0; ;idef++ ) /* until trailer record found */
if ( symdefs[idef].symbol == NULL ) break; /* reached end-of-table */
else /* check against caller's symbol */
if ( strncmp(symbol,symdefs[idef].symbol,symlen) == 0 ) /* found match */
if (fontnum==0 /* mathmode, so check every match */
|| (0 && istextmode && (!alphasym /* text mode and not alpha symbol */
|| symdefs[idef].handler!=NULL)) /* or text mode and directive */
|| (symdefs[idef].family==family /* have correct family */
&& symdefs[idef].handler==NULL) ) /* and not a handler collision */
#if 0
|| (fontnum==1 && symdefs[idef].family==CMR10) /*textmode && rm text*/
|| (fontnum==2 && symdefs[idef].family==CMMI10) /*textmode && it text*/
|| (fontnum==3 && symdefs[idef].family==BBOLD10 /*textmode && bb text*/
&& symdefs[idef].handler==NULL)
|| (fontnum==4 && symdefs[idef].family==CMMIB10 /*textmode && bf text*/
&& symdefs[idef].handler==NULL) )
#endif
if ( (deflen=strlen(symdefs[idef].symbol)) < minlen ) /*new best match*/
{ bestdef = idef; /* save index of new best match */
if ( (minlen = deflen) /* and save its len for next test */
== symlen ) break; } /*perfect match, so return with it*/
if ( bestdef < 0 ) /* failed to look up symbol */
if ( fontnum != 0 ) /* we're in a restricted font mode */
{ int oldfontnum = fontnum; /* save current font family */
mathchardef *symdef = NULL; /* lookup result with fontnum=0 */
fontnum = 0; /*try to look up symbol in any font*/
symdef = get_symdef(symbol); /* repeat lookup with fontnum=0 */
fontnum = oldfontnum; /* reset font family */
return symdef; } /* caller gets fontnum=0 lookup */
if ( msgfp!=NULL && msglevel>=999 ) /* debugging output */
{ fprintf(msgfp,"get_symdef> symbol=%s matches symtable[%d]=%s\n",
symbol,bestdef,(bestdef<0?"NotFound":symdefs[bestdef].symbol));
fflush(msgfp); }
return ( (bestdef<0? NULL : &(symdefs[bestdef])) ); /*NULL or best symdef[]*/
} /* --- end-of-function get_symdef() --- */
/* ==========================================================================
* Function: get_chardef ( symdef, size )
* Purpose: returns chardef ptr containing data for symdef at given size
* --------------------------------------------------------------------------
* Arguments: symdef (I) mathchardef * corresponding to symbol
* whose corresponding chardef is wanted
* size (I) int containing 0-5 for desired size
* --------------------------------------------------------------------------
* Returns: ( chardef * ) pointer to struct defining symbol at size,
* or NULL for any error
* --------------------------------------------------------------------------
* Notes: o if size unavailable, the next-closer-to-normalsize
* is returned instead.
* ======================================================================= */
/* --- entry point --- */
chardef *get_chardef ( mathchardef *symdef, int size )
{
/* -------------------------------------------------------------------------
Allocations and Declarations
-------------------------------------------------------------------------- */
fontfamily *fonts = fonttable; /* table of font families */
chardef **fontdef, /*tables for desired font, by size*/
*gfdata = (chardef *)NULL; /* chardef for symdef,size */
int ifont; /* fonts[] index */
int family, charnum; /* indexes retrieved from symdef */
int sizeinc = 0, /*+1 or -1 to get closer to normal*/
normalsize = 2; /* this size always present */
int isBig = 0; /*true if symbol's 1st char is upper*/
char *symptr = NULL; /* look for 1st alpha of symbol */
/* -------------------------------------------------------------------------
initialization
-------------------------------------------------------------------------- */
/* --- check symdef --- */
if ( symdef == NULL ) return ( NULL ); /* get_symdef() probably failed */
/* --- get local copy of indexes from symdef --- */
family = symdef->family; /* font family containing symbol */
charnum = symdef->charnum; /* char# of symbol within font */
/* --- check for supersampling --- */
if ( issupersampling ) /* check for supersampling fonts */
if ( fonts != ssfonttable ) /* uh oh--probably internal error */
{ fonts = ssfonttable; } /* force it */
/* --- check requested size, and set size increment --- */
if ( 0 && issupersampling ) /* set size index for supersampling */
size = LARGESTSIZE+1; /* index 1 past largest size */
else /* low pass indexes 0...LARGESTSIZE */
{
if( size<0 ) size = 0; /* size was definitely too small */
if( size>LARGESTSIZE ) size = LARGESTSIZE; /* or definitely too large */
if( size<normalsize ) sizeinc = (+1); /*use next larger if size too small*/
if( size>normalsize ) sizeinc = (-1); /*or next smaller if size too large*/
}
/* --- check for really big symbol (1st char of symbol name uppercase) --- */
for ( symptr=symdef->symbol; *symptr!='\000'; symptr++ ) /*skip leading \'s*/
if ( isalpha(*symptr) ) /* found leading alpha char */
{ isBig = isupper(*symptr); /* is 1st char of name uppercase? */
if ( !isBig /* 1st char lowercase */
&& strlen(symptr) >= 4 ) /* but followed by at least 3 chars */
isBig = !memcmp(symptr,"big\\",4) /* isBig if name starts with big\ */
|| !memcmp(symptr,"bigg",4); /* or with bigg */
break; } /* don't check beyond 1st char */
/* -------------------------------------------------------------------------
find font family in table of fonts[]
-------------------------------------------------------------------------- */
/* --- look up font family --- */
for ( ifont=0; ;ifont++ ) /* until trailer record found */
if ( fonts[ifont].family < 0 ) return ( NULL ); /* error, no such family */
else if ( fonts[ifont].family == family ) break; /* found font family */
/* --- get local copy of table for this family by size --- */
fontdef = fonts[ifont].fontdef; /* font by size */
/* -------------------------------------------------------------------------
get font in desired size, or closest available size, and return symbol
-------------------------------------------------------------------------- */
/* --- get font in desired size --- */
while ( 1 ) /* find size or closest available */
if ( fontdef[size] != NULL ) break; /* found available size */
else /* adjust size closer to normal */
if ( size == NORMALSIZE /* already normal so no more sizes,*/
|| sizeinc == 0 ) return ( NULL); /* or must be supersampling */
else /*bump size 1 closer to NORMALSIZE*/
size += sizeinc; /* see if adjusted size available */
/* --- ptr to chardef struct --- */
gfdata = &((fontdef[size])[charnum]); /*ptr to chardef for symbol in size*/
/* -------------------------------------------------------------------------
kludge to tweak CMEX10 (which appears to have incorrect descenders)
-------------------------------------------------------------------------- */
if ( family == CMEX10 ) /* cmex10 needs tweak */
{ int height = gfdata->toprow - gfdata->botrow + 1; /*total height of char*/
gfdata->botrow = (isBig? (-height/3) : (-height/4));
gfdata->toprow = gfdata->botrow + gfdata->image.height; }
/* -------------------------------------------------------------------------
return subraster containing chardef data for symbol in requested size
-------------------------------------------------------------------------- */
return ( gfdata ); /*ptr to chardef for symbol in size*/
} /* --- end-of-function get_chardef() --- */
/* ==========================================================================
* Function: get_charsubraster ( symdef, size )
* Purpose: returns new subraster ptr containing
* data for symdef at given size
* --------------------------------------------------------------------------
* Arguments: symdef (I) mathchardef * corresponding to symbol whose
* corresponding chardef subraster is wanted
* size (I) int containing 0-5 for desired size
* --------------------------------------------------------------------------
* Returns: ( subraster * ) pointer to struct defining symbol at size,
* or NULL for any error
* --------------------------------------------------------------------------
* Notes: o just wraps a subraster envelope around get_chardef()
* ======================================================================= */
/* --- entry point --- */
subraster *get_charsubraster ( mathchardef *symdef, int size )
{
/* -------------------------------------------------------------------------
Allocations and Declarations
-------------------------------------------------------------------------- */
chardef *get_chardef(), *gfdata=NULL; /* chardef struct for symdef,size */
int get_baseline(); /* baseline of gfdata */
subraster *new_subraster(), *sp=NULL; /* subraster containing gfdata */
raster *bitmaprp=NULL, *gftobitmap(); /* convert .gf-format to bitmap */
int delete_subraster(); /* in case gftobitmap() fails */
int aasupsamp(), /*antialias char with supersampling*/
grayscale=256; /* aasupersamp() parameters */
/* -------------------------------------------------------------------------
look up chardef for symdef at size, and embed data (gfdata) in subraster
-------------------------------------------------------------------------- */
if ( (gfdata=get_chardef(symdef,size)) /* look up chardef for symdef,size */
!= NULL ) /* and check that we found it */
if ( (sp=new_subraster(0,0,0)) /* allocate subraster "envelope" */
!= NULL ) /* and check that we succeeded */
{
raster *image = &(gfdata->image); /* ptr to chardef's bitmap or .gf */
int format = image->format; /* 1=bitmap, else .gf */
sp->symdef = symdef; /* replace NULL with caller's arg */
sp->size = size; /*replace default with caller's size*/
sp->baseline = get_baseline(gfdata); /* get baseline of character */
if ( format == 1 ) /* already a bitmap */
{ sp->type = CHARASTER; /* static char raster */
sp->image = image; } /* store ptr to its bitmap */
else /* need to convert .gf-to-bitmap */
if ( (bitmaprp = gftobitmap(image)) /* convert */
!= (raster *)NULL ) /* successful */
{ sp->type = IMAGERASTER; /* allocated raster will be freed */
sp->image = bitmaprp; } /* store ptr to converted bitmap */
else /* conversion failed */
{ delete_subraster(sp); /* free unneeded subraster */
sp = (subraster *)NULL; /* signal error to caller */
goto end_of_job; } /* quit */
if ( issupersampling ) /* antialias character right here */
{
raster *aa = NULL; /* antialiased char raster */
int status = aasupsamp(sp->image,&aa,shrinkfactor,grayscale);
if ( status ) /* supersampled successfully */
{ int baseline = sp->baseline; /* baseline before supersampling */
int height = gfdata->image.height; /* #rows before supersampling */
sp->image = aa; /* replace chardef with ss image */
if ( baseline >= height-1 ) /* baseline at bottom of char */
sp->baseline = aa->height -1; /* so keep it at bottom */
else /* char has descenders */
sp->baseline /= shrinkfactor; /* rescale baseline */
sp->type = IMAGERASTER; } /* character is an image raster */
} /* --- end-of-if(issupersampling) --- */
} /* --- end-of-if(sp!=NULL) --- */
end_of_job:
if ( msgfp!=NULL && msglevel>=999 )
{ fprintf(msgfp,"get_charsubraster> requested symbol=\"%s\" baseline=%d\n",
symdef->symbol, (sp==NULL?0:sp->baseline)); fflush(msgfp); }
return ( sp ); /* back to caller */
} /* --- end-of-function get_charsubraster() --- */
/* ==========================================================================
* Function: get_symsubraster ( symbol, size )
* Purpose: returns new subraster ptr containing
* data for symbol at given size
* --------------------------------------------------------------------------
* Arguments: symbol (I) char * corresponding to symbol
* whose corresponding subraster is wanted
* size (I) int containing 0-5 for desired size
* --------------------------------------------------------------------------
* Returns: ( subraster * ) pointer to struct defining symbol at size,
* or NULL for any error
* --------------------------------------------------------------------------
* Notes: o just combines get_symdef() and get_charsubraster()
* ======================================================================= */
/* --- entry point --- */
subraster *get_symsubraster ( char *symbol, int size )
{
/* -------------------------------------------------------------------------
Allocations and Declarations
-------------------------------------------------------------------------- */
subraster *sp=NULL, *get_charsubraster(); /* subraster containing gfdata */
mathchardef *symdef=NULL, *get_symdef(); /* mathchardef lookup for symbol */
/* -------------------------------------------------------------------------
look up mathchardef for symbol
-------------------------------------------------------------------------- */
if ( symbol != NULL ) /* user supplied input symbol */
symdef = get_symdef(symbol); /*look up corresponding mathchardef*/
/* -------------------------------------------------------------------------
look up chardef for mathchardef and wrap a subraster structure around data
-------------------------------------------------------------------------- */
if ( symdef != NULL ) /* lookup succeeded */
sp = get_charsubraster(symdef,size); /* so get symbol data in subraster */
return ( sp ); /* back to caller with sp or NULL */
} /* --- end-of-function get_symsubraster() --- */
/* ==========================================================================
* Function: get_baseline ( gfdata )
* Purpose: returns baseline for a chardef struct
* --------------------------------------------------------------------------
* Arguments: gfdata (I) chardef * containing chardef for symbol
* whose baseline is wanted
* --------------------------------------------------------------------------
* Returns: ( int ) baseline for symdef,
* or -1 for any error
* --------------------------------------------------------------------------
* Notes: o Unlike TeX, the top-left corners of our rasters are (0,0),
* with (row,col) increasing as you move down and right.
* Baselines are calculated with respect to this scheme,
* so 0 would mean the very top row is on the baseline
* and everything else descends below the baseline.
* ======================================================================= */
/* --- entry point --- */
int get_baseline ( chardef *gfdata )
{
/* -------------------------------------------------------------------------
Allocations and Declarations
-------------------------------------------------------------------------- */
int /*toprow = gfdata->toprow,*/ /*TeX top row from .gf file info*/
botrow = gfdata->botrow, /*TeX bottom row from .gf file info*/
height = gfdata->image.height; /* #rows comprising symbol */
/* -------------------------------------------------------------------------
give caller baseline
-------------------------------------------------------------------------- */
return ( (height-1) + botrow ); /* note: descenders have botrow<0 */
} /* --- end-of-function get_baseline() --- */
/* ==========================================================================
* Function: get_delim ( char *symbol, int height, int family )
* Purpose: returns subraster corresponding to the samllest
* character containing symbol, but at least as large as height,
* and in caller's family (if specified).
* If no symbol character as large as height is available,
* then the largest availabale character is returned instead.
* --------------------------------------------------------------------------
* Arguments: symbol (I) char * containing (substring of) desired
* symbol, e.g., if symbol="(", then any
* mathchardef like "(" or "\\(", etc, match.
* height (I) int containing minimum acceptable height
* for returned character
* family (I) int containing -1 to consider all families,
* or, e.g., CMEX10 for only that family
* --------------------------------------------------------------------------
* Returns: ( subraster * ) best matching character available,
* or NULL for any error
* --------------------------------------------------------------------------
* Notes: o If height is passed as negative, its absolute value is used
* but the best-fit width is searched for (rather than height)
* ======================================================================= */
/* --- entry point --- */
subraster *get_delim ( char *symbol, int height, int family )
{
/* -------------------------------------------------------------------------
Allocations and Declarations
-------------------------------------------------------------------------- */
mathchardef *symdefs = symtable; /* table of mathchardefs */
subraster *get_charsubraster(), *sp=(subraster *)NULL; /* best match char */
subraster *make_delim(); /* construct delim if can't find it*/
chardef *get_chardef(), *gfdata=NULL; /* get chardef struct for a symdef */
char lcsymbol[256], *symptr, /* lowercase symbol for comparison */
*unescsymbol = symbol; /* unescaped symbol */
int symlen = (symbol==NULL?0:strlen(symbol)), /* #chars in caller's sym*/
deflen = 0; /* length of symdef (aka lcsymbol) */
int idef = 0, /* symdefs[] index */
bestdef = (-9999), /* index of best fit symdef */
bigdef = (-9999); /*index of biggest (in case no best)*/
int size = 0, /* size index 0...LARGESTSIZE */
bestsize = (-9999), /* index of best fit size */
bigsize = (-9999); /*index of biggest (in case no best)*/
int defheight, bestheight=9999, /* height of best fit symdef */
bigheight = (-9999); /*height of biggest(in case no best)*/
int iswidth = 0; /* true if best-fit width desired */
int isunesc = 0, /* true if leading escape removed */
issq=0, isoint=0; /* true for \sqcup,etc, \oint,etc */
char *bigint="bigint", *bigoint="bigoint"; /* substitutes for int, oint */
/* -------------------------------------------------------------------------
determine if searching height or width, and search symdefs[] for best-fit
-------------------------------------------------------------------------- */
/* --- arg checks --- */
if ( symlen < 1 ) return (sp); /* no input symbol suplied */
if ( strcmp(symbol,"e") == 0 ) return(sp); /* e causes segfault??? */
/* --- ignore leading escapes for CMEX10 --- */
if ( 1 ) /* ignore leading escape */
if ( (family==CMEX10 || family==CMSYEX) ) { /* for CMEX10 or CMSYEX */
if ( strstr(symbol,"sq") != NULL ) /* \sq symbol requested */
issq = 1; /* seq \sq signal */
if ( strstr(symbol,"oint") != NULL ) /* \oint symbol requested */
isoint = 1; /* seq \oint signal */
if ( *symbol=='\\' ) /* have leading \ */
{ unescsymbol = symbol+1; /* push past leading \ */
if ( --symlen < 1 ) return(sp); /* one less char */
if ( strcmp(unescsymbol,"int") == 0 ) /* \int requested by caller */
unescsymbol = bigint; /* but big version looks better */
if ( strcmp(unescsymbol,"oint") == 0 ) /* \oint requested by caller */
unescsymbol = bigoint; /* but big version looks better */
symlen = strlen(unescsymbol); /* explicitly recalculate length */
isunesc = 1; } /* signal leading escape removed */
} /* --- end-of-if(family) --- */
/* --- determine whether searching for best-fit height or width --- */
if ( height < 0 ) /* negative signals width search */
{ height = (-height); /* flip "height" positive */
iswidth = 1; } /* set flag for width search */
/* --- search symdefs[] for best-fit height (or width) --- */
for ( idef=0; ;idef++ ) /* until trailer record found */
{
char *defsym = symdefs[idef].symbol; /* local copies */
int deffam = symdefs[idef].family;
if ( defsym == NULL ) break; /* reached end-of-table */
else /* check against caller's symbol */
if ( family<0 || deffam == family /* if explicitly in caller's family*/
|| (family==CMSYEX && (deffam==CMSY10||deffam==CMEX10||deffam==STMARY10)) )
{
strcpy(lcsymbol,defsym); /* local copy of symdefs[] symbol */
if ( isunesc && *lcsymbol=='\\' ) /* ignored leading \ in symbol */
strcpy(lcsymbol,lcsymbol+1); /* so squeeze it out of lcsymbol too*/
if ( 0 ) /* don't ignore case */
for ( symptr=lcsymbol; *symptr!='\000'; symptr++ ) /*for each symbol ch*/
if ( isalpha(*symptr) ) *symptr=tolower(*symptr); /*lowercase the char*/
deflen = strlen(lcsymbol); /* #chars in symbol we're checking */
if ((symptr=strstr(lcsymbol,unescsymbol)) != NULL) /*found caller's sym*/
if ( (isoint || strstr(lcsymbol,"oint")==NULL) /* skip unwanted "oint"*/
&& (issq || strstr(lcsymbol,"sq")==NULL) ) /* skip unwanted "sq" */
if ( (deffam == CMSY10 ? /* CMSY10 or not CMSY10 */
symptr == lcsymbol /* caller's sym is a prefix */
&& deflen == symlen: /* and same length */
symptr == lcsymbol /* caller's sym is a prefix */
|| symptr == lcsymbol+deflen-symlen) ) /* or a suffix */
for ( size=0; size<=LARGESTSIZE; size++ ) /* check all font sizes */
if ( (gfdata=get_chardef(&(symdefs[idef]),size)) != NULL ) /*got one*/
{ defheight = gfdata->image.height; /* height of this character */
if ( iswidth ) /* width search wanted instead... */
defheight = gfdata->image.width; /* ...so substitute width */
leftsymdef = &(symdefs[idef]); /* set symbol class, etc */
if ( defheight>=height && defheight<bestheight ) /*new best fit*/
{ bestdef=idef; bestsize=size; /* save indexes of best fit */
bestheight = defheight; } /* and save new best height */
if ( defheight >= bigheight ) /* new biggest character */
{ bigdef=idef; bigsize=size; /* save indexes of biggest */
bigheight = defheight; } /* and save new big height */
} /* --- end-of-if(gfdata!=NULL) --- */
} /* --- end-of-if(family) --- */
} /* --- end-of-for(idef) --- */
/* -------------------------------------------------------------------------
construct subraster for best fit character, and return it to caller
-------------------------------------------------------------------------- */
if ( bestdef >= 0 ) /* found a best fit for caller */
sp = get_charsubraster(&(symdefs[bestdef]),bestsize); /* best subraster */
if ( (sp==NULL && height-bigheight>5) /* try to construct delim */
|| bigdef < 0 ) /* delim not in font tables */
sp = make_delim(symbol,(iswidth?-height:height)); /* try to build delim */
if ( sp==NULL && bigdef>=0 ) /* just give biggest to caller */
sp = get_charsubraster(&(symdefs[bigdef]),bigsize); /* biggest subraster */
if ( msgfp!=NULL && msglevel>=99 )
fprintf(msgfp,"get_delim> symbol=%.50s, height=%d family=%d isokay=%s\n",
(symbol==NULL?"null":symbol),height,family,(sp==NULL?"fail":"success"));
return ( sp );
} /* --- end-of-function get_delim() --- */
/* ==========================================================================
* Function: make_delim ( char *symbol, int height )
* Purpose: constructs subraster corresponding to symbol
* exactly as large as height,
* --------------------------------------------------------------------------
* Arguments: symbol (I) char * containing, e.g., if symbol="("
* for desired delimiter
* height (I) int containing height
* for returned character
* --------------------------------------------------------------------------
* Returns: ( subraster * ) constructed delimiter
* or NULL for any error
* --------------------------------------------------------------------------
* Notes: o If height is passed as negative, its absolute value is used
* and interpreted as width (rather than height)
* ======================================================================= */
/* --- entry point --- */
subraster *make_delim ( char *symbol, int height )
{
/* -------------------------------------------------------------------------
Allocations and Declarations
-------------------------------------------------------------------------- */
subraster *sp = (subraster *)NULL, /* subraster returned to caller */
*new_subraster(); /* allocate subraster */
subraster *get_symsubraster(), /* look up delim pieces in cmex10 */
*symtop=NULL, *symbot=NULL, *symmid=NULL, *symbar=NULL, /* pieces */
*topsym=NULL, *botsym=NULL, *midsym=NULL, *barsym=NULL, /* +filler */
*rastack(), *rastcat(); /* stack pieces, concat filler */
int isdrawparen = 0; /*1=draw paren, 0=build from pieces*/
raster *rasp = (raster *)NULL; /* sp->image */
int isokay=0, delete_subraster(); /* set true if delimiter drawn ok */
int pixsz = 1, /* pixels are one bit each */
symsize = 0; /* size arg for get_symsubraster() */
int thickness = 1; /* drawn lines are one pixel thick */
int aspectratio = 8; /* default height/width for parens */
int iswidth = 0, /*true if width specified by height*/
width = height; /* #pixels width (e.g., of ellipse)*/
char *lp=NULL, *rp=NULL, /* check symbol for left or right */
*lp2=NULL, *rp2=NULL, /* synonym for lp,rp */
*lp3=NULL, *rp3=NULL, /* synonym for lp,rp */
*lp4=NULL, *rp4=NULL; /* synonym for lp,rp */
int circle_raster(), /* ellipse for ()'s in sp->image */
rule_rsater(), /* horizontal or vertical lines */
line_raster(); /* line between two points */
subraster *uparrow_subraster(); /* up/down arrows */
int isprealloc = 1; /*pre-alloc subraster, except arrow*/
int oldsmashmargin = smashmargin, /* save original smashmargin */
wascatspace = iscatspace; /* save original iscatspace */
/* -------------------------------------------------------------------------
initialization
-------------------------------------------------------------------------- */
/* --- determine whether constructing height or width --- */
if ( height < 0 ) /* negative "height" signals width */
{ width = height = (-height); /* flip height positive */
iswidth = 1; } /* set flag for width */
if ( height < 3 ) goto end_of_job; /* too small, must be error */
/* --- set default width (or height) accordingly --- */
if ( iswidth ) height = (width+(aspectratio+1)/2)/aspectratio;
else width = (height+(aspectratio+1)/2)/aspectratio;
if ( strchr(symbol,'=') != NULL /* left or right || bracket wanted */
|| strstr(symbol,"\\|") != NULL /* same || in standard tex notation*/
|| strstr(symbol,"dbl") != NULL ) /* semantic bracket with ||'s */
width = max2(width,6); /* need space between two |'s */
if ( width < 2 ) width=2; /* set min width */
if ( strchr(symbol,'(') != NULL /* if left ( */
|| strchr(symbol,')') != NULL ) /* or right ) paren wanted */
{ width = (3*width)/2; /* adjust width */
if ( !isdrawparen ) isprealloc=0; } /* don't prealloc if building */
if ( strchr(symbol,'/') != NULL /* left / */
|| strstr(symbol,"\\\\") != NULL /* or \\ for right \ */
|| strstr(symbol,"backsl") != NULL ) /* or \backslash for \ */
width = max2(height/3,5);
if ( strstr(symbol,"arrow") != NULL ) /* arrow wanted */
{ width = min2(height/3,20); /* adjust width */
isprealloc = 0; } /* don't preallocate subraster */
if ( strchr(symbol,'{') != NULL /* if left { */
|| strchr(symbol,'}') != NULL ) /* or right } brace wanted */
{ isprealloc = 0; } /* don't preallocate */
/* --- allocate and initialize subraster for constructed delimiter --- */
if ( isprealloc ) /* pre-allocation wanted */
{ if ( (sp=new_subraster(width,height,pixsz)) /* allocate new subraster */
== NULL ) goto end_of_job; /* quit if failed */
/* --- initialize delimiter subraster parameters --- */
sp->type = IMAGERASTER; /* image */
sp->symdef = NULL; /* not applicable for image */
sp->baseline = height/2 + 2; /* is a little above center good? */
sp->size = NORMALSIZE; /* size (probably unneeded) */
rasp = sp->image; } /* pointer to image in subraster */
/* -------------------------------------------------------------------------
( ) parens
-------------------------------------------------------------------------- */
if ( (lp=strchr(symbol,'(')) != NULL /* left ( paren wanted */
|| (rp=strchr(symbol,')')) != NULL ) /* right ) paren wanted */
{
if ( isdrawparen ) { /* draw the paren */
int mywidth = min2(width,20); /* max width for ()'s */
circle_raster ( rasp, /* embedded raster image */
0, 0, /* row0,col0 are upper-left corner */
height-1, mywidth-1, /* row1,col1 are lower-right */
thickness, /* line thickness is 1 pixel */
(rp==NULL?"23":"41") ); /* "1234" quadrants to be drawn */
isokay = 1; } /* set flag */
else {
int isleft = (lp!=NULL?1:0); /* true for left, false for right */
char *parentop = (isleft?"\\leftparentop":"\\rightparentop"),
*parenbot = (isleft?"\\leftparenbot":"\\rightparenbot"),
*parenbar = (isleft?"\\leftparenbar":"\\rightparenbar");
int baseht=0, barht=0, /* height of base=top+bot, bar */
ibar=0, nbars=0; /* bar index, #bars between top&bot*/
int largestsize = min2(2,LARGESTSIZE), /* largest size for parens */
topfill=(isleft?0:0), botfill=(isleft?0:0),
barfill=(isleft?0:7); /* alignment fillers */
/* --- get pieces at largest size smaller than total height --- */
for ( symsize=largestsize; symsize>=0; symsize-- ) /*largest to smallest*/
{
/* --- get pieces at current test size --- */
isokay = 1; /* check for all pieces */
if ( (symtop=get_symsubraster(parentop,symsize)) == NULL ) isokay=0;
if ( (symbot=get_symsubraster(parenbot,symsize)) == NULL ) isokay=0;
if ( (symbar=get_symsubraster(parenbar,symsize)) == NULL ) isokay=0;
/* --- check sum of pieces against total desired height --- */
if ( isokay ) { /* all pieces retrieved */
baseht = (symtop->image)->height + (symbot->image)->height; /*top+bot*/
barht = (symbar->image)->height; /* bar height */
if ( baseht < height+5 ) break; /* largest base that's not too big */
if ( symsize < 1 ) break; /* or smallest available base */
} /* --- end-of-if(isokay) --- */
/* --- free test pieces that were too big --- */
if ( symtop != NULL ) delete_subraster(symtop); /* free top */
if ( symbot != NULL ) delete_subraster(symbot); /* free bot */
if ( symbar != NULL ) delete_subraster(symbar); /* free bar */
isokay = 0; /* nothing available */
if ( symsize < 1 ) break; /* leave isokay=0 after smallest */
} /* --- end-of-for(symsize) --- */
/* --- construct brace from pieces --- */
if ( isokay ) { /* we have the pieces */
/* --- add alignment fillers --- */
smashmargin = iscatspace = 0; /*turn off rastcat smashing,space*/
topsym = (topfill>0?rastcat(new_subraster(topfill,1,1),symtop,3):symtop);
botsym = (botfill>0?rastcat(new_subraster(botfill,1,1),symbot,3):symbot);
barsym = (barfill>0?rastcat(new_subraster(barfill,1,1),symbar,3):symbar);
smashmargin = oldsmashmargin; /* reset smashmargin */
iscatspace = wascatspace; /* reset iscatspace */
/* --- #bars needed between top and bot --- */
nbars = (barht<1?0:max2(0,1+(height-baseht)/barht)); /* #bars needed */
/* --- stack pieces --- */
sp = topsym; /* start with top piece */
if ( nbars > 0 ) /* need nbars between top and bot */
for ( ibar=1; ibar<=nbars; ibar++ ) sp = rastack(barsym,sp,1,0,0,2);
sp = rastack(botsym,sp,1,0,0,3); /* bottom below bars or middle */
delete_subraster(barsym); /* barsym no longer needed */
} /* --- end-of-if(isokay) --- */
} /* --- end-of-if/else(isdrawparen) --- */
} /* --- end-of-if(left- or right-() paren wanted) --- */
/* -------------------------------------------------------------------------
{ } braces
-------------------------------------------------------------------------- */
else
if ( (lp=strchr(symbol,'{')) != NULL /* left { brace wanted */
|| (rp=strchr(symbol,'}')) != NULL ) /* right } brace wanted */
{
int isleft = (lp!=NULL?1:0); /* true for left, false for right */
char *bracetop = (isleft?"\\leftbracetop":"\\rightbracetop"),
*bracebot = (isleft?"\\leftbracebot":"\\rightbracebot"),
*bracemid = (isleft?"\\leftbracemid":"\\rightbracemid"),
*bracebar = (isleft?"\\leftbracebar":"\\rightbracebar");
int baseht=0, barht=0, /* height of base=top+bot+mid, bar */
ibar=0, nbars=0; /* bar index, #bars above,below mid*/
int largestsize = min2(2,LARGESTSIZE), /* largest size for braces */
topfill=(isleft?4:0), botfill=(isleft?4:0),
midfill=(isleft?0:4), barfill=(isleft?4:4); /* alignment fillers */
/* --- get pieces at largest size smaller than total height --- */
for ( symsize=largestsize; symsize>=0; symsize-- ) /*largest to smallest*/
{
/* --- get pieces at current test size --- */
isokay = 1; /* check for all pieces */
if ( (symtop=get_symsubraster(bracetop,symsize)) == NULL ) isokay=0;
if ( (symbot=get_symsubraster(bracebot,symsize)) == NULL ) isokay=0;
if ( (symmid=get_symsubraster(bracemid,symsize)) == NULL ) isokay=0;
if ( (symbar=get_symsubraster(bracebar,symsize)) == NULL ) isokay=0;
/* --- check sum of pieces against total desired height --- */
if ( isokay ) { /* all pieces retrieved */
baseht = (symtop->image)->height + (symbot->image)->height
+ (symmid->image)->height; /* top+bot+mid height */
barht = (symbar->image)->height; /* bar height */
if ( baseht < height+5 ) break; /* largest base that's not too big */
if ( symsize < 1 ) break; /* or smallest available base */
} /* --- end-of-if(isokay) --- */
/* --- free test pieces that were too big --- */
if ( symtop != NULL ) delete_subraster(symtop); /* free top */
if ( symbot != NULL ) delete_subraster(symbot); /* free bot */
if ( symmid != NULL ) delete_subraster(symmid); /* free mid */
if ( symbar != NULL ) delete_subraster(symbar); /* free bar */
isokay = 0; /* nothing available */
if ( symsize < 1 ) break; /* leave isokay=0 after smallest */
} /* --- end-of-for(symsize) --- */
/* --- construct brace from pieces --- */
if ( isokay ) { /* we have the pieces */
/* --- add alignment fillers --- */
smashmargin = iscatspace = 0; /*turn off rastcat smashing,space*/
topsym = (topfill>0?rastcat(new_subraster(topfill,1,1),symtop,3):symtop);
botsym = (botfill>0?rastcat(new_subraster(botfill,1,1),symbot,3):symbot);
midsym = (midfill>0?rastcat(new_subraster(midfill,1,1),symmid,3):symmid);
barsym = (barfill>0?rastcat(new_subraster(barfill,1,1),symbar,3):symbar);
smashmargin = oldsmashmargin; /* reset smashmargin */
iscatspace = wascatspace; /* reset iscatspace */
/* --- #bars needed on each side of mid piece --- */
nbars = (barht<1?0:max2(0,1+(height-baseht)/barht/2)); /*#bars per side*/
/* --- stack pieces --- */
sp = topsym; /* start with top piece */
if ( nbars > 0 ) /* need nbars above middle */
for ( ibar=1; ibar<=nbars; ibar++ ) sp = rastack(barsym,sp,1,0,0,2);
sp = rastack(midsym,sp,1,0,0,3); /*mid after top or bars*/
if ( nbars > 0 ) /* need nbars below middle */
for ( ibar=1; ibar<=nbars; ibar++ ) sp = rastack(barsym,sp,1,0,0,2);
sp = rastack(botsym,sp,1,0,0,3); /* bottom below bars or middle */
delete_subraster(barsym); /* barsym no longer needed */
} /* --- end-of-if(isokay) --- */
} /* --- end-of-if(left- or right-{} brace wanted) --- */
/* -------------------------------------------------------------------------
[ ] brackets
-------------------------------------------------------------------------- */
else
if ( (lp=strchr(symbol,'[')) != NULL /* left [ bracket wanted */
|| (rp=strchr(symbol,']')) != NULL /* right ] bracket wanted */
|| (lp2=strstr(symbol,"lceil")) != NULL /* left ceiling wanted */
|| (rp2=strstr(symbol,"rceil")) != NULL /* right ceiling wanted */
|| (lp3=strstr(symbol,"lfloor")) != NULL /* left floor wanted */
|| (rp3=strstr(symbol,"rfloor")) != NULL /* right floor wanted */
|| (lp4=strstr(symbol,"llbrack")) != NULL /* left semantic bracket */
|| (rp4=strstr(symbol,"rrbrack")) != NULL ) /* right semantic bracket */
{
/* --- use rule_raster ( rasp, top, left, width, height, type=0 ) --- */
int mywidth = min2(width,12), /* max width for horizontal bars */
wthick = 1; /* thickness of top.bottom bars */
thickness = (height<25?1:2); /* set lines 1 or 2 pixels thick */
if ( lp2!=NULL || rp2!=NULL || lp3!=NULL || rp3 !=NULL ) /*ceil or floor*/
wthick = thickness; /* same thickness for top/bot bar */
if ( lp3==NULL && rp3==NULL ) /* set top bar if floor not wanted */
rule_raster(rasp, 0,0, mywidth,wthick, 0); /* top horizontal bar */
if ( lp2==NULL && rp2==NULL ) /* set bot bar if ceil not wanted */
rule_raster(rasp, height-wthick,0, mywidth,thickness, 0); /* bottom */
if ( lp!=NULL || lp2!=NULL || lp3!=NULL || lp4!=NULL ) /* left bracket */
rule_raster(rasp, 0,0, thickness,height, 0); /* left vertical bar */
if ( lp4 != NULL ) /* 2nd left vertical bar needed */
rule_raster(rasp, 0,thickness+1, 1,height, 0); /* 2nd left vertical bar */
if ( rp!=NULL || rp2!=NULL || rp3!=NULL || rp4!=NULL ) /* right bracket */
rule_raster(rasp, 0,mywidth-thickness, thickness,height, 0); /* right */
if ( rp4 != NULL ) /* 2nd right vertical bar needed */
rule_raster(rasp, 0,mywidth-thickness-2, 1,height, 0); /*2nd right vert*/
isokay = 1; /* set flag */
} /* --- end-of-if(left- or right-[] bracket wanted) --- */
/* -------------------------------------------------------------------------
< > brackets
-------------------------------------------------------------------------- */
else
if ( (lp=strchr(symbol,'<')) != NULL /* left < bracket wanted */
|| (rp=strchr(symbol,'>')) != NULL ) /* right > bracket wanted */
{
/* --- use line_raster( rasp, row0, col0, row1, col1, thickness ) --- */
int mywidth = min2(width,12), /* max width for brackets */
mythick = 1; /* all lines one pixel thick */
thickness = (height<25?1:2); /* set line pixel thickness */
if ( lp != NULL ) /* left < bracket wanted */
{ line_raster(rasp,height/2,0,0,mywidth-1,mythick);
if ( thickness>1 )
line_raster(rasp,height/2,1,0,mywidth-1,mythick);
line_raster(rasp,height/2,0,height-1,mywidth-1,mythick);
if ( thickness>1 )
line_raster(rasp,height/2,1,height-1,mywidth-1,mythick); }
if ( rp != NULL ) /* right > bracket wanted */
{ line_raster(rasp,height/2,mywidth-1,0,0,mythick);
if ( thickness>1 )
line_raster(rasp,height/2,mywidth-2,0,0,mythick);
line_raster(rasp,height/2,mywidth-1,height-1,0,mythick);
if ( thickness>1 )
line_raster(rasp,height/2,mywidth-2,height-1,0,mythick); }
isokay = 1; /* set flag */
} /* --- end-of-if(left- or right-<> bracket wanted) --- */
/* -------------------------------------------------------------------------
/ \ delimiters
-------------------------------------------------------------------------- */
else
if ( (lp=strchr(symbol,'/')) != NULL /* left / wanted */
|| (rp=strstr(symbol,"\\\\")) != NULL /* right \ wanted */
|| (rp2=strstr(symbol,"backsl")) != NULL ) /* right \ wanted */
{
/* --- use line_raster( rasp, row0, col0, row1, col1, thickness ) --- */
int mywidth = width; /* max width for / \ */
thickness = 1; /* set line pixel thickness */
if ( lp != NULL ) /* left / wanted */
line_raster(rasp,0,mywidth-1,height-1,0,thickness);
if ( rp!=NULL || rp2!=NULL ) /* right \ wanted */
line_raster(rasp,0,0,height-1,mywidth-1,thickness);
isokay = 1; /* set flag */
} /* --- end-of-if(left- or right-/\ delimiter wanted) --- */
/* -------------------------------------------------------------------------
arrow delimiters
-------------------------------------------------------------------------- */
else
if ( strstr(symbol,"arrow") != NULL ) /* arrow delimiter wanted */
{
/* --- use uparrow_subraster(width,height,pixsz,drctn,isBig) --- */
int mywidth = width; /* max width for / \ */
int isBig = (strstr(symbol,"Up")!=NULL /* isBig if we have an Up */
|| strstr(symbol,"Down")!=NULL); /* or a Down */
int drctn = +1; /* init for uparrow */
if ( strstr(symbol,"down")!=NULL /* down if we have down */
|| strstr(symbol,"Down")!=NULL ) /* or Down */
{ drctn = (-1); /* reset direction to down */
if ( strstr(symbol,"up")!=NULL /* updown if we have up or Up */
|| strstr(symbol,"Up")!=NULL ) /* and down or Down */
drctn = 0; } /* reset direction to updown */
sp = uparrow_subraster(mywidth,height,pixsz,drctn,isBig);
if ( sp != NULL )
{ sp->type = IMAGERASTER; /* image */
sp->symdef = NULL; /* not applicable for image */
sp->baseline = height/2 + 2; /* is a little above center good? */
sp->size = NORMALSIZE; /* size (probably unneeded) */
isokay = 1; } /* set flag */
} /* --- end-of-if(arrow delimiter wanted) --- */
/* -------------------------------------------------------------------------
\- for | | brackets or \= for || || brackets
-------------------------------------------------------------------------- */
else
if ( (lp=strchr(symbol,'-')) != NULL /* left or right | bracket wanted */
|| (lp2=strchr(symbol,'|')) != NULL /* synonym for | bracket */
|| (rp=strchr(symbol,'=')) != NULL /* left or right || bracket wanted */
|| (rp2=strstr(symbol,"\\|"))!= NULL ) /* || in standard tex notation */
{
/* --- rule_raster ( rasp, top, left, width, height, type=0 ) --- */
int midcol = width/2; /* middle col, left of mid if even */
if ( rp != NULL /* left or right || bracket wanted */
|| rp2 != NULL ) /* or || in standard tex notation */
{ thickness = (height<75?1:2); /* each | of || 1 or 2 pixels thick*/
rule_raster(rasp, 0,max2(0,midcol-2), thickness,height, 0); /* left */
rule_raster(rasp, 0,min2(width,midcol+2), thickness,height, 0); }
else /*nb, lp2 spuriously set if rp2 set*/
if ( lp != NULL /* left or right | bracket wanted */
|| lp2 != NULL ) /* ditto for synomym */
{ thickness = (height<75?1:2); /* set | 1 or 2 pixels thick */
rule_raster(rasp, 0,midcol, thickness,height, 0); } /*mid vertical bar*/
isokay = 1; /* set flag */
} /* --- end-of-if(left- or right-[] bracket wanted) --- */
/* -------------------------------------------------------------------------
back to caller
-------------------------------------------------------------------------- */
end_of_job:
if ( msgfp!=NULL && msglevel>=99 )
fprintf(msgfp,"make_delim> symbol=%.50s, isokay=%d\n",
(symbol==NULL?"null":symbol),isokay);
if ( !isokay ) /* don't have requested delimiter */
{ if (sp!=NULL) delete_subraster(sp); /* so free unneeded structure */
sp = NULL; } /* and signal error to caller */
return ( sp ); /*back to caller with delim or NULL*/
} /* --- end-of-function make_delim() --- */
/* ==========================================================================
* Function: texchar ( expression, chartoken )
* Purpose: scans expression, returning either its first character,
* or the next \sequence if that first char is \,
* and a pointer to the first expression char past that.
* --------------------------------------------------------------------------
* Arguments: expression (I) char * to first char of null-terminated
* string containing valid LaTeX expression
* to be scanned
* chartoken (O) char * to null-terminated string returning
* either the first (non-whitespace) character
* of expression if that char isn't \, or else
* the \ and everything following it up to
* the next non-alphabetic character (but at
* least one char following the \ even if
* it's non-alpha)
* --------------------------------------------------------------------------
* Returns: ( char * ) ptr to the first char of expression
* past returned chartoken,
* or NULL for any parsing error.
* --------------------------------------------------------------------------
* Notes: o Does *not* skip leading whitespace, but simply
* returns any whitespace character as the next character.
* ======================================================================= */
/* --- entry point --- */
char *texchar ( char *expression, char *chartoken )
{
/* -------------------------------------------------------------------------
Allocations and Declarations
-------------------------------------------------------------------------- */
int esclen = 0, /*length of escape sequence*/
maxesclen = 128; /* max len of esc sequence */
char *ptoken = chartoken; /* ptr into chartoken */
int iprefix = 0; /* prefix index */
static char *prefixes[] = /*e.g., \big followed by ( */
{ /* "\\left", "\\right", */
"\\big", "\\Big", "\\bigg", "\\Bigg",
"\\bigl", "\\Bigl", "\\biggl", "\\Biggl",
"\\bigr", "\\Bigr", "\\biggr", "\\Biggr", NULL };
/* -------------------------------------------------------------------------
just return the next char if it's not \
-------------------------------------------------------------------------- */
/* --- error check for end-of-string --- */
*ptoken = '\000'; /* init in case of error */
if ( expression == NULL ) return(NULL); /* nothing to scan */
if ( *expression == '\000' ) return(NULL); /* nothing to scan */
/* --- always returning first character (either \ or some other char) --- */
*ptoken++ = *expression++; /* here's first character */
/* --- if first char isn't \, then just return it to caller --- */
if ( !isthischar(*(expression-1),ESCAPE) ) /* not a \, so return char */
{ *ptoken = '\000'; /* add a null terminator */
goto end_of_job; } /* ptr past returned char */
if ( *expression == '\000' ) /* \ is very last char */
{ *chartoken = '\000'; /* flush bad trailing \ */
return(NULL); } /* and signal end-of-job */
/* -------------------------------------------------------------------------
we have an escape sequence, so return all alpha chars following \
-------------------------------------------------------------------------- */
/* --- accumulate chars until first non-alpha char found --- */
for ( ; isalpha(*expression); esclen++ ) /* till first non-alpha... */
{ if ( esclen < maxesclen-3 ) /* more room in chartoken */
*ptoken++ = *expression; /*copy alpha char, bump ptr*/
expression++; } /* bump expression ptr */
/* --- if we have a prefix, append next texchar, e.g., \big( --- */
*ptoken = '\000'; /* set null for compare */
for ( iprefix=0; prefixes[iprefix] != NULL; iprefix++ ) /* run thru list */
if ( strcmp(chartoken,prefixes[iprefix]) == 0 ) /* have an exact match */
{ char nextchar[256]; int nextlen=0; /* texchar after prefix */
skipwhite(expression); /* skip space after prefix*/
expression = texchar(expression,nextchar); /* get nextchar */
if ( (nextlen = strlen(nextchar)) > 0 ) /* #chars in nextchar */
{ strcpy(ptoken,nextchar); /* append nextchar */
ptoken += strlen(nextchar); /* point to null terminator*/
esclen += strlen(nextchar); } /* and bump escape length */
break; } /* stop checking prefixes */
/* --- every \ must be followed by at least one char, e.g., \[ --- */
if ( esclen < 1 ) /* \ followed by non-alpha */
*ptoken++ = *expression++; /*copy non-alpha, bump ptrs*/
else { /* normal alpha \sequence */
/* --- respect spaces in text mode, except first space after \escape --- */
if ( istextmode ) /* in \rm or \it text mode */
if ( isthischar(*expression,WHITEDELIM) ) /* delim follows \sequence */
expression++; } /* so flush delim */
*ptoken = '\000'; /* null-terminate token */
/* --- back to caller --- */
end_of_job:
if ( msgfp!=NULL && msglevel>=999 )
{ fprintf(msgfp,"texchar> returning token = \"%s\"\n",chartoken);
fflush(msgfp); }
return ( expression ); /*ptr to 1st non-alpha char*/
} /* --- end-of-function texchar() --- */
/* ==========================================================================
* Function: texsubexpr (expression,subexpr,maxsubsz,
* left,right,isescape,isdelim)
* Purpose: scans expression, returning everything between a balanced
* left{...right} subexpression if the first non-whitespace
* char of expression is an (escaped or unescaped) left{,
* or just the next texchar() otherwise,
* and a pointer to the first expression char past that.
* --------------------------------------------------------------------------
* Arguments: expression (I) char * to first char of null-terminated
* string containing valid LaTeX expression
* to be scanned
* subexpr (O) char * to null-terminated string returning
* either everything between a balanced {...}
* subexpression if the first char is {,
* or the next texchar() otherwise.
* maxsubsz (I) int containing max #bytes returned
* in subexpr buffer (0 means unlimited)
* left (I) char * specifying allowable left delimiters
* that begin subexpression, e.g., "{[(<"
* right (I) char * specifying matching right delimiters
* in the same order as left, e.g., "}])>"
* isescape (I) int controlling whether escaped and/or
* unescaped left,right are matched;
* see isbrace() comments below for details.
* isdelim (I) int containing true (non-zero) to return
* the leading left and trailing right delims
* (if any were found) along with subexpr,
* or containing false=0 to return subexpr
* without its delimiters
* --------------------------------------------------------------------------
* Returns: ( char * ) ptr to the first char of expression
* past returned subexpr (see Notes),
* or NULL for any parsing error.
* --------------------------------------------------------------------------
* Notes: o If subexpr is of the form left{...right},
* the outer {}'s are returned as part of subexpr
* if isdelim is true; if isdelim is false the {}'s aren't
* returned. In either case the returned pointer is
* *always* bumped past the closing right}, even if
* that closing right} isn't returned in subexpr.
* o If subexpr is not of the form left{...right},
* the returned pointer is on the character immediately
* following the last character returned in subexpr
* o \. acts as LaTeX \right. and matches any \left(
* And it also acts as a LaTeX \left. and matches any \right)
* ======================================================================= */
/* --- entry point --- */
char *texsubexpr ( char *expression, char *subexpr, int maxsubsz,
char *left, char *right, int isescape, int isdelim )
{
/* -------------------------------------------------------------------------
Allocations and Declarations
-------------------------------------------------------------------------- */
char *texchar(); /*next char (or \sequence) from expression*/
char *leftptr, leftdelim[256] = "(\000", /* left( found in expression */
rightdelim[256] = ")\000"; /* and matching right) */
char *origexpression=expression, *origsubexpr=subexpr; /*original inputs*/
char *strtexchr(), *texleft(); /* check for \left, and get it */
int gotescape = 0, /* true if leading char of expression is \ */
prevescape = 0; /* while parsing, true if preceding char \ */
int isbrace(); /* check for left,right braces */
int isanyright = 1; /* true matches any right with left, (...] */
int isleftdot = 0; /* true if left brace is a \. */
int nestlevel = 1; /* current # of nested braces */
int subsz=0 /*, maxsubsz=8192*/; /* #chars in returned subexpr[] buffer*/
/* -------------------------------------------------------------------------
skip leading whitespace and just return the next char if it's not {
-------------------------------------------------------------------------- */
/* --- skip leading whitespace and error check for end-of-string --- */
*subexpr = '\000'; /* init in case of error */
if ( expression == NULL ) return(NULL); /*can't dereference null ptr*/
skipwhite(expression); /* leading whitespace gone */
if ( *expression == '\000' ) return(NULL); /* nothing left to scan */
/* --- set maxsubsz --- */
if ( maxsubsz < 1 ) maxsubsz = 8192; /* input 0 means unlimited */
/* --- check for escape --- */
if ( isthischar(*expression,ESCAPE) ) /* expression is escaped */
gotescape = 1; /* so set flag accordingly */
/* --- check for \left...\right --- */
if ( gotescape ) /* begins with \ */
if ( memcmp(expression+1,"left",4) ) /* and followed by left */
if ( strchr(left,'l') != NULL ) /* caller wants \left's */
if ( strtexchr(expression,"\\left") == expression ) /*expression=\left...*/
{ char *pright = texleft(expression,subexpr,maxsubsz, /* find ...\right*/
(isdelim?NULL:leftdelim),rightdelim);
if ( isdelim ) strcat(subexpr,rightdelim); /* caller wants delims */
return ( pright ); /*back to caller past \right*/
} /* --- end-of-if(expression=="\\left") --- */
/* --- if first char isn't left{ or script, just return it to caller --- */
if ( !isbrace(expression,left,isescape) ) /* not a left{ */
if ( !isthischar(*expression,SCRIPTS) ) /* and not a script */
return ( texchar(expression,subexpr) ); /* next char to caller */
else /* --- kludge for super/subscripts to accommodate texscripts() --- */
{ *subexpr++ = *expression; /* signal script */
*subexpr = '\000'; /* null-terminate subexpr */
return ( expression ); } /* leave script in stream */
/* --- extract left and find matching right delimiter --- */
*leftdelim = *(expression+gotescape); /* the left( in expression */
if ( (gotescape && *leftdelim == '.') /* we have a left \. */
|| (gotescape && isanyright) ) /*or are matching any right*/
{ isleftdot = 1; /* so just set flag */
*leftdelim = '\000'; } /* and reset leftdelim */
else /* find matching \right */
if ( (leftptr=strchr(left,*leftdelim)) != NULL ) /* ptr to that left( */
*rightdelim = right[(int)(leftptr-left)]; /* get the matching right) */
else /* can't happen -- pgm bug */
return ( NULL ); /*just signal eoj to caller*/
/* -------------------------------------------------------------------------
accumulate chars between balanced {}'s, i.e., till nestlevel returns to 0
-------------------------------------------------------------------------- */
/* --- first initialize by bumping past left{ or \{ --- */
if ( isdelim ) *subexpr++ = *expression++; /*caller wants { in subexpr*/
else expression++; /* always bump past left{ */
if ( gotescape ) /*need to bump another char*/
if ( isdelim ) *subexpr++ = *expression++; /* caller wants char, too */
else expression++; /* else just bump past it */
/* --- set maximum size for numerical arguments --- */
if ( 0 ) /* check turned on or off? */
if ( !isescape && !isdelim ) /*looking for numerical arg*/
maxsubsz = 96; /* set max arg size */
/* --- search for matching right} --- */
while ( 1 ) /*until balanced right} */
{
/* --- error check for end-of-string --- */
if ( *expression == '\000' ) /* premature end-of-string */
{ if ( 0 && (!isescape && !isdelim) ) /*looking for numerical arg,*/
{ expression = origexpression; /* so end-of-string is error*/
subexpr = origsubexpr; } /* so reset all ptrs */
if ( isdelim ) /* generate fake right */
if ( gotescape ) /* need escaped right */
{ *subexpr++ = '\\'; /* set escape char */
*subexpr++ = '.'; } /* and fake \right. */
else /* escape not wanted */
*subexpr++ = *rightdelim; /* so fake actual right */
*subexpr = '\000'; /* null-terminate subexpr */
return ( expression ); } /* back with final token */
/* --- check preceding char for escape --- */
if ( isthischar(*(expression-1),ESCAPE) ) /* previous char was \ */
prevescape = 1-prevescape; /* so flip escape flag */
else prevescape = 0; /* or turn flag off */
/* --- check for { and } (un/escaped as per leading left) --- */
if ( gotescape == prevescape ) /* escaped iff leading is */
{ /* --- check for (closing) right delim and see if we're done --- */
if ( isthischar(*expression,rightdelim) /* found a right} */
|| (isleftdot && isthischar(*expression,right)) /*\left. matches all*/
|| (prevescape && isthischar(*expression,".")) ) /*or found \right. */
if ( --nestlevel < 1 ) /*\right balances 1st \left*/
{ if ( isdelim ) /*caller wants } in subexpr*/
*subexpr++ = *expression; /* so end subexpr with } */
else /*check for \ before right}*/
if ( prevescape ) /* have unwanted \ */
*(subexpr-1) = '\000'; /* so replace it with null */
*subexpr = '\000'; /* null-terminate subexpr */
return ( expression+1 ); } /* back with char after } */
/* --- check for (another) left{ --- */
if ( isthischar(*expression,leftdelim) /* found another left{ */
|| (isleftdot && isthischar(*expression,left)) ) /* any left{ */
nestlevel++;
} /* --- end-of-if(gotescape==prevescape) --- */
/* --- not done, so copy char to subexpr and continue with next char --- */
if ( ++subsz < maxsubsz-5 ) /* more room in subexpr */
*subexpr++ = *expression; /* so copy char and bump ptr*/
expression++; /* bump expression ptr */
} /* --- end-of-while(1) --- */
} /* --- end-of-function texsubexpr() --- */
/* ==========================================================================
* Function: texleft (expression,subexpr,maxsubsz,ldelim,rdelim)
* Purpose: scans expression, starting after opening \left,
* and returning ptr after matching closing \right.
* Everything between is returned in subexpr, if given.
* Likewise, if given, ldelim returns delimiter after \left
* and rdelim returns delimiter after \right.
* If ldelim is given, the returned subexpr doesn't include it.
* If rdelim is given, the returned pointer is after that delim.
* --------------------------------------------------------------------------
* Arguments: expression (I) char * to first char of null-terminated
* string immediately following opening \left
* subexpr (O) char * to null-terminated string returning
* either everything between balanced
* \left ... \right. If leftdelim given,
* subexpr does _not_ contain that delimiter.
* maxsubsz (I) int containing max #bytes returned
* in subexpr buffer (0 means unlimited)
* ldelim (O) char * returning delimiter following
* opening \left
* rdelim (O) char * returning delimiter following
* closing \right
* --------------------------------------------------------------------------
* Returns: ( char * ) ptr to the first char of expression
* past closing \right, or past closing
* right delimiter if rdelim!=NULL,
* or NULL for any error.
* --------------------------------------------------------------------------
* Notes: o
* ======================================================================= */
/* --- entry point --- */
char *texleft ( char *expression, char *subexpr, int maxsubsz,
char *ldelim, char *rdelim )
{
/* -------------------------------------------------------------------------
Allocations and Declarations
-------------------------------------------------------------------------- */
char *texchar(), /* get delims after \left,\right */
*strtexchr(), *pright=expression; /* locate matching \right */
static char left[16]="\\left", right[16]="\\right"; /* tex delimiters */
int sublen = 0; /* #chars between \left...\right */
/* -------------------------------------------------------------------------
initialization
-------------------------------------------------------------------------- */
/* --- init output --- */
if ( subexpr != NULL ) *subexpr = '\000'; /* init subexpr, if given */
if ( ldelim != NULL ) *ldelim = '\000'; /* init ldelim, if given */
if ( rdelim != NULL ) *rdelim = '\000'; /* init rdelim, if given */
/* --- check args --- */
if ( expression == NULL ) goto end_of_job; /* no input supplied */
if ( *expression == '\000' ) goto end_of_job; /* nothing after \left */
/* --- determine left delimiter --- */
if ( ldelim != NULL ) /* caller wants left delim */
{ skipwhite(expression); /* interpret \left ( as \left( */
expression = texchar(expression,ldelim); } /*delim from expression*/
/* -------------------------------------------------------------------------
locate \right balancing opening \left
-------------------------------------------------------------------------- */
/* --- first \right following \left --- */
if ( (pright=strtexchr(expression,right)) /* look for \right after \left */
!= NULL ) { /* found it */
/* --- find matching \right by pushing past any nested \left's --- */
char *pleft = expression; /* start after first \left( */
while ( 1 ) { /*break when matching \right found*/
/* -- locate next nested \left if there is one --- */
if ( (pleft=strtexchr(pleft,left)) /* find next \left */
== NULL ) break; /*no more, so matching \right found*/
pleft += strlen(left); /* push ptr past \left token */
if ( pleft >= pright ) break; /* not nested if \left after \right*/
/* --- have nested \left, so push forward to next \right --- */
if ( (pright=strtexchr(pright+strlen(right),right)) /* find next \right */
== NULL ) break; /* ran out of \right's */
} /* --- end-of-while(1) --- */
} /* --- end-of-if(pright!=NULL) --- */
/* --- set subexpression length, push pright past \right --- */
if ( pright != (char *)NULL ) /* found matching \right */
{ sublen = (int)(pright-expression); /* #chars between \left...\right */
pright += strlen(right); } /* so push pright past \right */
/* -------------------------------------------------------------------------
get rightdelim and subexpr between \left...\right
-------------------------------------------------------------------------- */
/* --- get delimiter following \right --- */
if ( rdelim != NULL ) /* caller wants right delim */
if ( pright == (char *)NULL ) /* assume \right. at end of exprssn*/
{ strcpy(rdelim,"."); /* set default \right. */
sublen = strlen(expression); /* use entire remaining expression */
pright = expression + sublen; } /* and push pright to end-of-string*/
else /* have explicit matching \right */
{ skipwhite(pright); /* interpret \right ) as \right) */
pright = texchar(pright,rdelim); /* pull delim from expression */
if ( *rdelim == '\000' ) strcpy(rdelim,"."); } /* or set \right. */
/* --- get subexpression between \left...\right --- */
if ( sublen > 0 ) /* have subexpr */
if ( subexpr != NULL ) { /* and caller wants it */
if ( maxsubsz > 0 ) sublen = min2(sublen,maxsubsz-1); /* max buffer size */
memcpy(subexpr,expression,sublen); /* stuff between \left...\right */
subexpr[sublen] = '\000'; } /* null-terminate subexpr */
end_of_job:
if ( msglevel>=99 && msgfp!=NULL )
{ fprintf(msgfp,"texleft> ldelim=%s, rdelim=%s, subexpr=%.128s\n",
(ldelim==NULL?"none":ldelim),(rdelim==NULL?"none":rdelim),
(subexpr==NULL?"none":subexpr)); fflush(msgfp); }
return ( pright );
} /* --- end-of-function texleft --- */
/* ==========================================================================
* Function: texscripts ( expression, subscript, superscript, which )
* Purpose: scans expression, returning subscript and/or superscript
* if expression is of the form _x^y or ^{x}_{y},
* or any (valid LaTeX) permutation of the above,
* and a pointer to the first expression char past "scripts"
* --------------------------------------------------------------------------
* Arguments: expression (I) char * to first char of null-terminated
* string containing valid LaTeX expression
* to be scanned
* subscript (O) char * to null-terminated string returning
* subscript (without _), if found, or "\000"
* superscript (O) char * to null-terminated string returning
* superscript (without ^), if found, or "\000"
* which (I) int containing 1 for subscript only,
* 2 for superscript only, >=3 for either/both
* --------------------------------------------------------------------------
* Returns: ( char * ) ptr to the first char of expression
* past returned "scripts" (unchanged
* except for skipped whitespace if
* neither subscript nor superscript found),
* or NULL for any parsing error.
* --------------------------------------------------------------------------
* Notes: o an input expression like ^a^b_c will return superscript="b",
* i.e., totally ignoring all but the last "script" encountered
* ======================================================================= */
/* --- entry point --- */
char *texscripts ( char *expression, char *subscript,
char *superscript, int which )
{
/* -------------------------------------------------------------------------
Allocations and Declarations
-------------------------------------------------------------------------- */
char *texsubexpr(); /* next subexpression from expression */
int gotsub=0, gotsup=0; /* check that we don't eat, e.g., x_1_2 */
/* -------------------------------------------------------------------------
init "scripts"
-------------------------------------------------------------------------- */
if ( subscript != NULL ) *subscript = '\000'; /*init in case no subscript*/
if ( superscript!=NULL ) *superscript = '\000'; /*init in case no super*/
/* -------------------------------------------------------------------------
get subscript and/or superscript from expression
-------------------------------------------------------------------------- */
while ( expression != NULL ) {
skipwhite(expression); /* leading whitespace gone */
if ( *expression == '\000' ) return(expression); /* nothing left to scan */
if ( isthischar(*expression,SUBSCRIPT) /* found _ */
&& (which==1 || which>2 ) ) /* and caller wants it */
{ if ( gotsub /* found 2nd subscript */
|| subscript == NULL ) break; /* or no subscript buffer */
gotsub = 1; /* set subscript flag */
expression = texsubexpr(expression+1,subscript,0,"{","}",0,0); }
else /* no _, check for ^ */
if ( isthischar(*expression,SUPERSCRIPT) /* found ^ */
&& which>=2 ) /* and caller wants it */
{ if ( gotsup /* found 2nd superscript */
|| superscript == NULL ) break; /* or no superscript buffer*/
gotsup = 1; /* set superscript flag */
expression = texsubexpr(expression+1,superscript,0,"{","}",0,0); }
else /* neither _ nor ^ */
return ( expression ); /*return ptr past "scripts"*/
} /* --- end-of-while(expression!=NULL) --- */
return ( expression );
} /* --- end-of-function texscripts() --- */
/* ==========================================================================
* Function: isbrace ( expression, braces, isescape )
* Purpose: checks leading char(s) of expression for a brace,
* either escaped or unescaped depending on isescape,
* except that { and } are always matched, if they're
* in braces, regardless of isescape.
* --------------------------------------------------------------------------
* Arguments: expression (I) char * to first char of null-terminated
* string containing a valid LaTeX expression
* whose leading char(s) are checked for braces
* that begin subexpression, e.g., "{[(<"
* braces (I) char * specifying matching brace delimiters
* to be checked for, e.g., "{[(<" or "}])>"
* isescape (I) int containing 0 to match only unescaped
* braces, e.g., (...) or {...}, etc,
* or containing 1 to match only escaped
* braces, e.g., \(...\) or \[...\], etc,
* or containing 2 to match either.
* But note: if {,} are in braces
* then they're *always* matched whether
* escaped or not, regardless of isescape.
* --------------------------------------------------------------------------
* Returns: ( int ) 1 if the leading char(s) of expression
* is a brace, or 0 if not.
* --------------------------------------------------------------------------
* Notes: o
* ======================================================================= */
/* --- entry point --- */
int isbrace ( char *expression, char *braces, int isescape )
{
/* -------------------------------------------------------------------------
Allocations and Declarations
-------------------------------------------------------------------------- */
int gotescape = 0, /* true if leading char is an escape */
gotbrace = 0; /*true if first non-escape char is a brace*/
/* -------------------------------------------------------------------------
check for brace
-------------------------------------------------------------------------- */
/* --- first check for end-of-string --- */
if ( *expression == '\000' ) return(0); /* nothing to check */
/* --- check leading char for escape --- */
if ( isthischar(*expression,ESCAPE) ) /* expression is escaped */
{ gotescape = 1; /* so set flag accordingly */
expression++; } /* and bump past escape */
/* --- check (maybe next char) for brace --- */
if ( isthischar(*expression,braces) ) /* expression is braced */
gotbrace = 1; /* so set flag accordingly */
if ( gotescape && *expression == '.' ) /* \. matches any brace */
gotbrace = 1; /* set flag */
/* --- check for TeX brace { or } --- */
if ( gotbrace && isthischar(*expression,"{}") ) /*expression has TeX brace*/
if ( isescape ) isescape = 2; /* reset escape flag */
/* -------------------------------------------------------------------------
back to caller
-------------------------------------------------------------------------- */
if ( gotbrace && /* found a brace */
( isescape==2 || /* escape irrelevant */
gotescape==isescape ) /* un/escaped as requested */
) return ( 1 ); return ( 0 ); /* return 1,0 accordingly */
} /* --- end-of-function isbrace() --- */
/* ==========================================================================
* Function: preamble ( expression, size, subexpr )
* Purpose: parses $-terminated preamble, if present, at beginning
* of expression, re-setting size if necessary, and
* returning any other parameters besides size in subexpr.
* --------------------------------------------------------------------------
* Arguments: expression (I) char * to first char of null-terminated
* string containing LaTeX expression possibly
* preceded by $-terminated preamble
* size (I/O) int * containing 0-4 default font size,
* and returning size modified by first
* preamble parameter (or unchanged)
* subexpr(O) char * returning any remaining preamble
* parameters past size
* --------------------------------------------------------------------------
* Returns: ( char * ) ptr to first char past preamble in expression
* or NULL for any parsing error.
* --------------------------------------------------------------------------
* Notes: o size can be any number >=0. If preceded by + or -, it's
* interpreted as an increment to input size; otherwise
* it's interpreted as the size.
* o if subexpr is passed as NULL ptr, then returned expression
* ptr will have "flushed" and preamble parameters after size
* ======================================================================= */
/* --- entry point --- */
char *preamble ( char *expression, int *size, char *subexpr )
{
/* -------------------------------------------------------------------------
Allocations and Declarations
-------------------------------------------------------------------------- */
char pretext[512], *prep=expression, /*pream from expression, ptr into it*/
*dollar, *comma; /* preamble delimiters */
int prelen = 0, /* preamble length */
sizevalue = 0, /* value of size parameter */
isfontsize = 0, /*true if leading fontsize present*/
isdelta = 0; /*true to increment passed size arg*/
/* -------------------------------------------------------------------------
initialization
-------------------------------------------------------------------------- */
if ( subexpr != NULL ) /* caller passed us an address */
*subexpr = '\000'; /* so init assuming no preamble */
if ( expression == NULL ) goto end_of_job; /* no input */
if ( *expression == '\000' ) goto end_of_job; /* input is an empty string */
/* -------------------------------------------------------------------------
process preamble if present
-------------------------------------------------------------------------- */
/*process_preamble:*/
if ( (dollar=strchr(expression,'$')) /* $ signals preceding preamble */
!= NULL ) /* found embedded $ */
if ( (prelen = (int)(dollar-expression)) /*#chars in expression preceding $*/
> 0 ) { /* must have preamble preceding $ */
if ( prelen < 65 ) { /* too long for a prefix */
memcpy(pretext,expression,prelen); /* local copy of preamble */
pretext[prelen] = '\000'; /* null-terminated */
if ( strchr(pretext,*(ESCAPE))==NULL /*shouldn't be an escape in preamble*/
&& strchr(pretext,'{') == NULL ) { /*shouldn't be a left{ in preamble*/
/* --- skip any leading whitespace --- */
prep = pretext; /* start at beginning of preamble */
skipwhite(prep); /* skip any leading white space */
/* --- check for embedded , or leading +/- (either signalling size) --- */
if ( isthischar(*prep,"+-") ) /* have leading + or - */
isdelta = 1; /* so use size value as increment */
comma = strchr(pretext,','); /* , signals leading size param */
/* --- process leading size parameter if present --- */
if ( comma != NULL /* size param explicitly signalled */
|| isdelta || isdigit(*prep) ) { /* or inferred implicitly */
/* --- parse size parameter and reset size accordingly --- */
if( comma != NULL ) *comma = '\000';/*, becomes null, terminating size*/
sizevalue = atoi(prep); /* convert size string to integer */
if ( size != NULL ) /* caller passed address for size */
*size = (isdelta? *size+sizevalue : sizevalue); /* so reset size */
/* --- finally, set flag and shift size parameter out of preamble --- */
isfontsize = 1; /*set flag showing font size present*/
if ( comma != NULL ) strcpy(pretext,comma+1);/*leading size param gone*/
} /* --- end-of-if(comma!=NULL||etc) --- */
/* --- copy any preamble params following size to caller's subexpr --- */
if ( comma != NULL || !isfontsize ) /*preamb contains params past size*/
if ( subexpr != NULL ) /* caller passed us an address */
strcpy(subexpr,pretext); /*so return extra params to caller*/
/* --- finally, set prep to shift preamble out of expression --- */
prep = expression + prelen+1; /* set prep past $ in expression */
} /* --- end-of-if(strchr(pretext,*ESCAPE)==NULL) --- */
} /* --- end-of-if(prelen<65) --- */
} /* --- end-of-if(prelen>0) --- */
else { /* $ is first char of expression */
int ndollars = 0; /* number of $...$ pairs removed */
prep = expression; /* start at beginning of expression*/
while ( *prep == '$' ) { /* remove all matching $...$'s */
int explen = strlen(prep)-1; /* index of last char in expression*/
if ( explen < 2 ) break; /* no $...$'s left to remove */
if ( prep[explen] != '$' ) break; /* unmatched $ */
prep[explen] = '\000'; /* remove trailing $ */
prep++; /* and remove matching leading $ */
ndollars++; /* count another pair removed */
} /* --- end-of-while(*prep=='$') --- */
ispreambledollars = ndollars; /* set flag to fix \displaystyle */
if ( ndollars == 1 ) /* user submitted $...$ expression */
isdisplaystyle = 0; /* so set \textstyle */
if ( ndollars > 1 ) /* user submitted $$...$$ */
isdisplaystyle = 2; /* so set \displaystyle */
/*goto process_preamble;*/ /*check for preamble after leading $*/
} /* --- end-of-if/else(prelen>0) --- */
/* -------------------------------------------------------------------------
back to caller
-------------------------------------------------------------------------- */
end_of_job:
return ( prep ); /*expression, or ptr past preamble*/
} /* --- end-of-function preamble() --- */
/* ==========================================================================
* Function: mimeprep ( expression )
* Purpose: preprocessor for mimeTeX input, e.g.,
* (a) removes comments,
* (b) converts \left( to \( and \right) to \),
* (c) xlates &html; special chars to equivalent latex
* Should only be called once (after unescape_url())
* --------------------------------------------------------------------------
* Arguments: expression (I/O) char * to first char of null-terminated
* string containing mimeTeX/LaTeX expression,
* and returning preprocessed string
* --------------------------------------------------------------------------
* Returns: ( char * ) ptr to input expression,
* or NULL for any parsing error.
* --------------------------------------------------------------------------
* Notes: o
* ======================================================================= */
/* --- entry point --- */
char *mimeprep ( char *expression )
{
/* -------------------------------------------------------------------------
Allocations and Declarations
-------------------------------------------------------------------------- */
char *expptr=expression, /* ptr within expression */
*tokptr=NULL, /*ptr to token found in expression*/
*texsubexpr(), argval[8192]; /*parse for macro args after token*/
char *strchange(); /* change leading chars of string */
char *findbraces(); /*find left { and right } for \atop*/
int idelim=0, /* left- or right-index */
isymbol=0; /*symbols[],rightcomment[],etc index*/
int xlateleft = 0; /* true to xlate \left and \right */
/* ---
* comments
* -------- */
char *leftptr=NULL; /* find leftcomment in expression */
static char *leftcomment = "%%", /* open comment */
*rightcomment[] = {"\n", "%%", NULL}; /* close comments */
/* ---
* special long (more than 1-char) \left and \right delimiters
* ----------------------------------------------------------- */
static char *leftfrom[] = /* xlate any \left suffix... */
{ "\\|", /* \left\| */
"\\{", /* \left\{ */
"\\langle", /* \left\langle */
NULL } ; /* --- end-of-leftfrom[] --- */
static char *leftto[] = /* ...to this instead */
{ "=", /* = */
"{", /* { */
"<", /* < */
NULL } ; /* --- end-of-leftto[] --- */
static char *rightfrom[] = /* xlate any \right suffix... */
{ "\\|", /* \right\| */
"\\}", /* \right\} */
"\\rangle", /* \right\rangle */
NULL } ; /* --- end-of-rightfrom[] --- */
static char *rightto[] = /* ...to this instead */
{ "=", /* = */
"}", /* } */
">", /* > */
NULL } ; /* --- end-of-rightto[] --- */
/* ---
* { \atop }-like commands
* ----------------------- */
char *atopsym=NULL; /* atopcommands[isymbol] */
static char *atopcommands[] = /* list of {a+b\command c+d}'s */
{ "\\over", /* plain tex for \frac */
"\\choose", /* binomial coefficient */
#ifndef NOATOP /*noatop preserves old mimeTeX rule*/
"\\atop",
#endif
NULL } ; /* --- end-of-atopcommands[] --- */
static char *atopdelims[] = /* delims for atopcommands[] */
{ NULL, NULL, /* \\over has no delims */
"\\left(", "\\right)", /* \\choose has ( ) delims*/
#ifndef NOATOP /*noatop preserves old mimeTeX rule*/
NULL, NULL, /* \\atop has no delims */
#endif
NULL, NULL } ; /* --- end-of-atopdelims[] --- */
/* ---
* html special/escape chars converted to latex equivalents
* -------------------------------------------------------- */
char *htmlsym=NULL; /* symbols[isymbol].html */
static struct { char *html; char *args; char *latex; } symbols[] =
{ /* ---------------------------------------
user-supplied newcommands
--------------------------------------- */
#ifdef NEWCOMMANDS /* -DNEWCOMMANDS=\"filename.h\" */
#include NEWCOMMANDS
#endif
/* ------------------------------------------
LaTeX Macro #args,default template...
------------------------------------------ */
{ "\\lvec", "2n", "{#2_1,\\cdots,#2_{#1}}" },
{ "\\grave", "1", "{\\stackrel{\\Huge\\gravesym}{#1}}" }, /* \grave */
{ "\\acute", "1", "{\\stackrel{\\Huge\\acutesym}{#1}}" }, /* \acute */
{ "\\check", "1", "{\\stackrel{\\Huge\\checksym}{#1}}" }, /* \check */
{ "\\breve", "1", "{\\stackrel{\\Huge\\brevesym}{#1}}" }, /* \breve */
{ "\\overset", NULL, "\\stackrel" }, /* just an alias */
{ "\\underset", "2", "\\relstack{#2}{#1}" }, /* reverse args */
/* ---------------------------------------
html char termchar LaTeX equivalent...
--------------------------------------- */
{ "&quot", ";", "\"" }, /* &quot; is first, &#034; */
{ "&amp", ";", "&" },
{ "&lt", ";", "<" },
{ "&gt", ";", ">" },
{ "&nbsp", ";", "~" },
{ "&iexcl", ";", "{\\raisebox{-2}{\\rotatebox{180}{!}}}" },
{ "&brvbar", ";", "|" },
{ "&plusmn", ";", "\\pm" },
{ "&sup2", ";", "{{}^2}" },
{ "&sup3", ";", "{{}^3}" },
{ "&micro", ";", "\\mu" },
{ "&sup1", ";", "{{}^1}" },
{ "&frac14", ";", "{\\frac14}" },
{ "&frac12", ";", "{\\frac12}" },
{ "&frac34", ";", "{\\frac34}" },
{ "&iquest", ";", "{\\raisebox{-2}{\\rotatebox{180}{?}}}" },
{ "&Acirc", ";", "{\\rm~\\hat~A}" },
{ "&Atilde", ";", "{\\rm~\\tilde~A}" },
{ "&Auml", ";", "{\\rm~\\ddot~A}" },
{ "&Aring", ";", "{\\rm~A\\limits^{-1$o}}" },
{ "&atilde", ";", "{\\rm~\\tilde~a}" },
{ "&yuml", ";", "{\\rm~\\ddot~y}" }, /* &yuml; is last, &#255; */
/* ---------------------------------------
html tag termchar LaTeX equivalent...
--------------------------------------- */
{ "<br>", NULL, "\\\\" },
{ "<br/>", NULL, "\\\\" },
{ "<Br>", NULL, "\\\\" },
{ "<Br/>", NULL, "\\\\" },
{ "<BR>", NULL, "\\\\" },
{ "<BR/>", NULL, "\\\\" },
/* ---------------------------------------
LaTeX termchar mimeTeX equivalent...
--------------------------------------- */
{ "\\AA", NULL, "{\\rm~A\\limits^{-1$o}}" },
{ "\\aa", NULL, "{\\rm~a\\limits^{-1$o}}" },
{ "\\bmod", NULL, "{\\hspace2{\\rm~mod}\\hspace2}" },
{ "\\vdots", NULL, "{\\raisebox3{\\rotatebox{90}{\\ldots}}}" },
{ "\\dots", NULL, "{\\cdots}" },
{ "\\cdots", NULL, "{\\raisebox3{\\ldots}}" },
{ "\\ldots", NULL, "{\\fs4.\\hspace1.\\hspace1.}" },
{ "\\ddots", NULL, "{\\fs4\\raisebox8.\\hspace1\\raisebox4.\\hspace1.}"},
{ "\\notin", NULL, "{\\not\\in}" },
{ "\\neq", NULL, "{\\not=}" },
{ "\\ne", NULL, "{\\not=}" },
{ "\\hbar", NULL, "{\\compose~h{{\\fs{-1}-\\atop\\vspace3}}}" },
{ "\\angle", NULL, "{\\compose{\\hspace{3}\\lt}{\\circle(10,15;-80,80)}}"},
{ "\\textcelsius", NULL, "{\\textdegree C}"},
{ "\\textdegree", NULL, "{\\Large^{^{\\tiny\\mathbf o}}}"},
{ "\\cr", NULL, "\\\\" },
{ "\\iiint", NULL, "{\\int\\int\\int}\\limits" },
{ "\\iint", NULL, "{\\int\\int}\\limits" },
{ "\\Bigiint", NULL, "{\\Bigint\\Bigint}\\limits" },
{ "\\bigsqcap",NULL, "{\\fs{+4}\\sqcap}" },
{ "!`", NULL, "{\\raisebox{-2}{\\rotatebox{180}{!}}}" },
{ "?`", NULL, "{\\raisebox{-2}{\\rotatebox{180}{?}}}" },
{ "^\'", "embed","\'" }, /* avoid ^^ when re-xlating \' below */
{ "\'\'\'\'","embed","^{\\fs{-1}\\prime\\prime\\prime\\prime}" },
{ "\'\'\'", "embed","^{\\fs{-1}\\prime\\prime\\prime}" },
{ "\'\'", "embed","^{\\fs{-1}\\prime\\prime}" },
{ "\'", "embed","^{\\fs{-1}\\prime}" },
{ "\\rightleftharpoons",NULL,"{\\rightharpoonup\\atop\\leftharpoondown}" },
{ "\\therefore",NULL,"{\\Huge\\raisebox{-4}{.\\atop.\\,.}}" },
{ "\\LaTeX", NULL, "{\\rm~L\\raisebox{3}{\\fs{-1}A}\\TeX}" },
{ "\\TeX", NULL, "{\\rm~T\\raisebox{-3}{E}X}" },
{ "\\cyan", NULL, "{\\reverse\\red\\reversebg}" },
{ "\\magenta",NULL, "{\\reverse\\green\\reversebg}" },
{ "\\yellow",NULL, "{\\reverse\\blue\\reversebg}" },
{ "\\cancel",NULL, "\\Not" },
{ "\\hhline",NULL, "\\Hline" },
{ "\\Hline", NULL, "\\hline\\,\\\\\\hline" },
/* ---------------------------------------------------------
"Algebra Syntax" termchar mimeTeX/LaTeX equivalent...
------------------------------------------------------------ */
{ "sqrt", "1", "{\\sqrt{#1}}" },
{ "sin", "1", "{\\sin{#1}}" },
{ "cos", "1", "{\\cos{#1}}" },
{ "asin", "1", "{\\sin^{-1}{#1}}" },
{ "acos", "1", "{\\cos^{-1}{#1}}" },
{ "exp", "1", "{{\\rm~e}^{#1}}" },
{ "det", "1", "{\\left|{#1}\\right|}" },
/* ---------------------------------------
LaTeX Constant termchar value...
--------------------------------------- */
{ "\\thinspace", NULL, "2" },
{ "\\thinmathspace", NULL, "2" },
{ "\\textwidth", NULL, "400" },
{ NULL, NULL, NULL }
} ; /* --- end-of-symbols[] --- */
/* -------------------------------------------------------------------------
first remove comments
-------------------------------------------------------------------------- */
expptr = expression; /* start search at beginning */
while ( (leftptr=strstr(expptr,leftcomment)) != NULL ) /*found leftcomment*/
{
char *rightsym=NULL; /* rightcomment[isymbol] */
expptr = leftptr+strlen(leftcomment); /* start rightcomment search here */
/* --- check for any closing rightcomment, in given precedent order --- */
if ( *expptr != '\000' ) /*have chars after this leftcomment*/
for(isymbol=0; (rightsym=rightcomment[isymbol]) != NULL; isymbol++)
if ( (tokptr=strstr(expptr,rightsym)) != NULL ) /*found rightcomment*/
{ tokptr += strlen(rightsym); /* first char after rightcomment */
if ( *tokptr == '\000' ) /*nothing after this rightcomment*/
{ *leftptr = '\000'; /*so terminate expr at leftcomment*/
break; } /* and stop looking for comments */
*leftptr = '~'; /* replace entire comment by ~ */
strcpy(leftptr+1,tokptr); /* and squeeze out comment */
goto next_comment; } /* stop looking for rightcomment */
/* --- no rightcomment after opening leftcomment --- */
*leftptr = '\000'; /* so terminate expression */
/* --- resume search past squeezed-out comment --- */
next_comment:
if ( *leftptr == '\000' ) break; /* reached end of expression */
expptr = leftptr+1; /*resume search after this comment*/
} /* --- end-of-while(leftptr!=NULL) --- */
/* -------------------------------------------------------------------------
convert \left( to \( and \right) to \), etc.
-------------------------------------------------------------------------- */
if ( xlateleft ) /* \left...\right xlation wanted */
for ( idelim=0; idelim<2; idelim++ ) /* 0 for \left and 1 for \right */
{
char *lrstr = (idelim==0?"\\left":"\\right"); /* \left on 1st pass */
int lrlen = (idelim==0?5:6); /* strlen() of \left or \right */
char *braces = (idelim==0?LEFTBRACES ".":RIGHTBRACES "."), /*([{<or)]}>*/
**lrfrom= (idelim==0?leftfrom:rightfrom), /* long braces like \| */
**lrto = (idelim==0?leftto:rightto), /* xlated to 1-char like = */
*lrsym = NULL; /* lrfrom[isymbol] */
expptr = expression; /* start search at beginning */
while ( (tokptr=strstr(expptr,lrstr)) != NULL ) /* found \left or \right */
{
if ( isthischar(*(tokptr+lrlen),braces) ) /* followed by a 1-char brace*/
{ strcpy(tokptr+1,tokptr+lrlen); /* so squeeze out "left" or "right"*/
expptr = tokptr+2; } /* and resume search past brace */
else /* may be a "long" brace like \| */
{
expptr = tokptr+lrlen; /*init to resume search past\left\rt*/
for(isymbol=0; (lrsym=lrfrom[isymbol]) != NULL; isymbol++)
{ int symlen = strlen(lrsym); /* #chars in delim, e.g., 2 for \| */
if ( memcmp(tokptr+lrlen,lrsym,symlen) == 0 ) /* found long delim*/
{ strcpy(tokptr+1,tokptr+lrlen+symlen-1); /* squeeze out delim */
*(tokptr+1) = *(lrto[isymbol]); /* last char now 1-char delim*/
expptr = tokptr+2 - lrlen; /* resume search past 1-char delim*/
break; } /* no need to check more lrsym's */
} /* --- end-of-for(isymbol) --- */
} /* --- end-of-if/else(isthischar()) --- */
} /* --- end-of-while(tokptr!=NULL) --- */
} /* --- end-of-for(idelim) --- */
/* -------------------------------------------------------------------------
run thru table, converting all occurrences of each macro to its expansion
-------------------------------------------------------------------------- */
for(isymbol=0; (htmlsym=symbols[isymbol].html) != NULL; isymbol++)
{
int htmllen = strlen(htmlsym); /* length of escape, _without_ ; */
int isalgebra = isalpha((int)(*htmlsym)); /* leading char alphabetic */
int isembedded = 0; /* true to xlate even if embedded */
char *aleft="{([<|", *aright="})]>|"; /*left,right delims for alg syntax*/
char *args = symbols[isymbol].args, /* number {}-args, optional []-arg */
*htmlterm = args, /*if *args nonumeric, then html term*/
*latexsym = symbols[isymbol].latex; /*latex replacement for htmlsym*/
char abuff[8192]; int iarg,nargs=0; /* macro expansion params */
if ( args != NULL ) /*we have args (or htmlterm) param*/
if ( *args != '\000' ) /* and it's not an empty string */
if ( strchr("0123456789",*args) != NULL ) /* is 1st char #args=0-9 ? */
{ htmlterm = NULL; /* if so, then we have no htmlterm */
*abuff = *args; abuff[1] = '\000'; /* #args char in ascii buffer */
nargs = atoi(abuff); } /* interpret #args to numeric */
else if ( strncmp(args,"embed",5) == 0 ) /* xlate even if embedded */
{ htmlterm = NULL; /* if so, then we have no htmlterm */
isembedded = 1 ; } /* turn on embedded flag */
expptr = expression; /* re-start search at beginning */
while ( (tokptr=strstr(expptr,htmlsym)) != NULL ) /* found another sym */
{ char termchar = *(tokptr+htmllen), /* char terminating html sequence */
prevchar = (tokptr==expptr?' ':*(tokptr-1)); /*char preceding html*/
int escapelen = htmllen; /* total length of escape sequence */
*abuff = '\000'; /* default to empty string */
if ( latexsym != NULL ) /* table has .latex xlation */
if ( *latexsym != '\000' ) /* and it's not an empty string */
strcpy(abuff,latexsym); /* so get local copy */
if ( htmlterm != NULL ) /* sequence may have terminator */
escapelen += (isthischar(termchar,htmlterm)?1:0); /*add terminator*/
if ( !isembedded ) /* don't xlate embedded sequence */
if ( isalpha((int)termchar) ) /*we just have prefix of longer sym*/
{ expptr = tokptr+htmllen; /* just resume search after prefix */
continue; } /* but don't replace it */
if ( isembedded ) /* for embedded sequence */
if ( isthischar(prevchar,ESCAPE) ) /* don't xlate escaped char */
{ expptr = tokptr+htmllen; /*just resume search after literal*/
continue; } /* but don't replace it */
if ( !isthischar(*htmlsym,ESCAPE) /* our symbol isn't escaped */
&& isalpha(*htmlsym) /* and our symbol starts with alpha*/
&& !isthischar(*htmlsym,"&") ) /* and not an &html; special char */
if ( tokptr != expression ) /* then if we're past beginning */
if ( isthischar(*(tokptr-1),ESCAPE) /*and if inline symbol escaped*/
|| (isalpha(*(tokptr-1))) ) /* or if suffix of longer string */
{ expptr = tokptr+escapelen; /*just resume search after literal*/
continue; } /* but don't replace it */
if ( nargs > 0 ) /*substitute #1,#2,... in latexsym*/
{
char *arg1ptr = tokptr+escapelen;/* nargs begin after macro literal */
char *optarg = args+1; /* ptr 1 char past #args digit 0-9 */
expptr = arg1ptr; /* ptr to beginning of next arg */
for ( iarg=1; iarg<=nargs; iarg++ ) /* one #`iarg` arg at a time */
{
char argsignal[32] = "#1", /* #1...#9 signals arg replacement */
*argsigptr = NULL; /* ptr to argsignal in abuff[] */
/* --- get argument value --- */
*argval = '\000'; /* init arg as empty string */
skipwhite(expptr); /* and skip leading white space */
if ( iarg==1 && *optarg!='\000' /* check for optional [arg] */
&& !isalgebra ) /* but not in "algebra syntax" */
{ strcpy(argval,optarg); /* init with default value */
if ( *expptr == '[' ) /* but user gave us [argval] */
expptr = texsubexpr(expptr,argval,0,"[","]",0,0); } /*so get it*/
else /* not optional, so get {argval} */
if ( *expptr != '\000' ) /* check that some argval provided */
if ( !isalgebra ) /* only { } delims for latex macro */
expptr = texsubexpr(expptr,argval,0,"{","}",0,0); /*get {argval}*/
else /*any delim for algebra syntax macro*/
{ expptr = texsubexpr(expptr,argval,0,aleft,aright,0,1);
if ( isthischar(*argval,aleft) ) /* have delim-enclosed arg */
if ( *argval != '{' ) /* and it's not { }-enclosed */
{ strchange(0,argval,"\\left"); /* insert opening \left, */
strchange(0,argval+strlen(argval)-1,"\\right"); } /*\right*/
} /* --- end-of-if/else(!isalgebra) --- */
/* --- replace #`iarg` in macro with argval --- */
sprintf(argsignal,"#%d",iarg); /* #1...#9 signals argument */
while ( (argsigptr=strstr(argval,argsignal)) != NULL ) /* #1...#9 */
strcpy(argsigptr,argsigptr+strlen(argsignal)); /*can't be in argval*/
while ( (argsigptr=strstr(abuff,argsignal)) != NULL ) /* #1...#9 */
strchange(strlen(argsignal),argsigptr,argval); /*replaced by argval*/
} /* --- end-of-for(iarg) --- */
escapelen += ((int)(expptr-arg1ptr)); /* add in length of all args */
} /* --- end-of-if(nargs>0) --- */
strchange(escapelen,tokptr,abuff); /*replace macro or html symbol*/
expptr = tokptr + strlen(abuff); /*resume search after macro / html*/
} /* --- end-of-while(tokptr!=NULL) --- */
} /* --- end-of-for(isymbol) --- */
/* -------------------------------------------------------------------------
run thru table, converting all {a+b\atop c+d} to \atop{a+b}{c+d}
-------------------------------------------------------------------------- */
for(isymbol=0; (atopsym=atopcommands[isymbol]) != NULL; isymbol++)
{
int atoplen = strlen(atopsym); /* #chars in \atop */
expptr = expression; /* re-start search at beginning */
while ( (tokptr=strstr(expptr,atopsym)) != NULL ) /* found another atop */
{ char *leftbrace=NULL, *rightbrace=NULL; /*ptr to opening {, closing }*/
char termchar = *(tokptr+atoplen); /* \atop followed by terminator */
if ( msgfp!=NULL && msglevel>=999 )
{ fprintf(msgfp,"mimeprep> offset=%d rhs=\"%s\"\n",
(int)(tokptr-expression),tokptr);
fflush(msgfp); }
if ( isalpha((int)termchar) ) /*we just have prefix of longer sym*/
{ expptr = tokptr+atoplen; /* just resume search after prefix */
continue; } /* but don't process it */
leftbrace = findbraces(expression,tokptr); /* find left { */
rightbrace = findbraces(NULL,tokptr+atoplen-1); /* find right } */
if ( leftbrace==NULL || rightbrace==NULL )
{ expptr += atoplen; continue; } /* skip command if didn't find */
else /* we have bracketed { \atop } */
{
int leftlen = (int)(tokptr-leftbrace) - 1, /* #chars in left arg */
rightlen = (int)(rightbrace-tokptr) - atoplen, /* and in right*/
totlen = (int)(rightbrace-leftbrace) + 1; /*tot in { \atop }*/
char *open=atopdelims[2*isymbol], *close=atopdelims[2*isymbol+1];
char arg[8192], command[8192]; /* left/right args, new \atop{}{} */
*command = '\000'; /* start with null string */
if (open!=NULL) strcat(command,open); /* add open delim if needed */
strcat(command,atopsym); /* add command with \atop */
arg[0] = '{'; /* arg starts with { */
memcpy(arg+1,leftbrace+1,leftlen); /* extract left-hand arg */
arg[leftlen+1] = '\000'; /* and null terminate it */
strcat(command,arg); /* concatanate {left-arg to \atop */
strcat(command,"}{"); /* close left-arg, open right-arg */
memcpy(arg,tokptr+atoplen,rightlen); /* right-hand arg */
arg[rightlen] = '}'; /* add closing } */
arg[rightlen+1] = '\000'; /* and null terminate it */
if ( isthischar(*arg,WHITEMATH) ) /* 1st char was mandatory space */
strcpy(arg,arg+1); /* so squeeze it out */
strcat(command,arg); /* concatanate right-arg} */
if (close!=NULL) strcat(command,close); /* add close delim if needed*/
strchange(totlen-2,leftbrace+1,command); /* {\atop} --> {\atop{}{}} */
expptr = leftbrace+strlen(command); /*resume search past \atop{}{}*/
}
} /* --- end-of-while(tokptr!=NULL) --- */
} /* --- end-of-for(isymbol) --- */
/* -------------------------------------------------------------------------
back to caller with preprocessed expression
-------------------------------------------------------------------------- */
if ( msgfp!=NULL && msglevel>=99 ) /* display preprocessed expression */
{ fprintf(msgfp,"mimeprep> expression=\"\"%s\"\"\n",expression);
fflush(msgfp); }
return ( expression );
} /* --- end-of-function mimeprep() --- */
/* ==========================================================================
* Function: strchange ( int nfirst, char *from, char *to )
* Purpose: Changes the nfirst leading chars of `from` to `to`.
* For example, to change char x[99]="12345678" to "123ABC5678"
* call strchange(1,x+3,"ABC")
* --------------------------------------------------------------------------
* Arguments: nfirst (I) int containing #leading chars of `from`
* that will be replace by `to`
* from (I/O) char * to null-terminated string whose nfirst
* leading chars will be replaced by `to`
* to (I) char * to null-terminated string that will
* replace the nfirst leading chars of `from`
* --------------------------------------------------------------------------
* Returns: ( char * ) ptr to first char of input `from`
* or NULL for any error.
* --------------------------------------------------------------------------
* Notes: o If strlen(to)>nfirst, from must have memory past its null
* (i.e., we don't do a realloc)
* ======================================================================= */
/* --- entry point --- */
char *strchange ( int nfirst, char *from, char *to )
{
/* -------------------------------------------------------------------------
Allocations and Declarations
-------------------------------------------------------------------------- */
int tolen = (to==NULL?0:strlen(to)), /* #chars in replacement string */
nshift = abs(tolen-nfirst); /*need to shift from left or right*/
/* -------------------------------------------------------------------------
shift from left or right to accommodate replacement of its nfirst chars by to
-------------------------------------------------------------------------- */
if ( tolen < nfirst ) /* shift left is easy */
strcpy(from,from+nshift); /* because memory doesn't overlap */
if ( tolen > nfirst ) /* need more room at start of from */
{ char *pfrom = from+strlen(from); /* ptr to null terminating from */
for ( ; pfrom>=from; pfrom-- ) /* shift all chars including null */
*(pfrom+nshift) = *pfrom; } /* shift chars nshift places right */
/* -------------------------------------------------------------------------
from has exactly the right number of free leading chars, so just put to there
-------------------------------------------------------------------------- */
if ( tolen != 0 ) /* make sure to not empty or null */
memcpy(from,to,tolen); /* chars moved into place */
return ( from ); /* changed string back to caller */
} /* --- end-of-function strchange() --- */
/* ==========================================================================
* Function: strreplace (char *string, char *from, char *to, int nreplace)
* Purpose: Changes the first nreplace occurrences of 'from' to 'to'
* in string, or all occurrences if nreplace=0.
* --------------------------------------------------------------------------
* Arguments: string (I/0) char * to null-terminated string in which
* occurrence of 'from' will be replaced by 'to'
* from (I) char * to null-terminated string
* to be replaced by 'to'
* to (I) char * to null-terminated string that will
* replace 'from'
* nreplace (I) int containing (maximum) number of
* replacements, or 0 to replace all.
* --------------------------------------------------------------------------
* Returns: ( int ) number of replacements performed,
* or 0 for no replacements or -1 for any error.
* --------------------------------------------------------------------------
* Notes: o
* ======================================================================= */
/* --- entry point --- */
int strreplace ( char *string, char *from, char *to, int nreplace )
{
/* -------------------------------------------------------------------------
Allocations and Declarations
-------------------------------------------------------------------------- */
int fromlen = (from==NULL?0:strlen(from)), /* #chars to be replaced */
tolen = (to==NULL?0:strlen(to)); /* #chars in replacement string */
char *pfrom = (char *)NULL, /*ptr to 1st char of from in string*/
*pstring = string, /*ptr past previously replaced from*/
*strchange(); /* change 'from' to 'to' */
int nreps = 0; /* #replacements returned to caller*/
/* -------------------------------------------------------------------------
repace occurrences of 'from' in string to 'to'
-------------------------------------------------------------------------- */
if ( string == (char *)NULL /* no input string */
|| (fromlen<1 && nreplace<=0) ) /* replacing empty string forever */
nreps = (-1); /* so signal error */
else /* args okay */
while (nreplace<1 || nreps<nreplace) /* up to #replacements requested */
{
if ( fromlen > 0 ) /* have 'from' string */
pfrom = strstr(pstring,from); /*ptr to 1st char of from in string*/
else pfrom = pstring; /*or empty from at start of string*/
if ( pfrom == (char *)NULL ) break; /*no more from's, so back to caller*/
if ( strchange(fromlen,pfrom,to) /* leading 'from' changed to 'to' */
== (char *)NULL ) { nreps=(-1); break; } /* signal error to caller */
nreps++; /* count another replacement */
pstring = pfrom+tolen; /* pick up search after 'to' */
if ( *pstring == '\000' ) break; /* but quit at end of string */
} /* --- end-of-while() --- */
return ( nreps ); /* #replacements back to caller */
} /* --- end-of-function strreplace() --- */
/* ==========================================================================
* Function: strtexchr (char *string, char *texchr )
* Purpose: Find first texchr in string, but texchr must be followed
* by non-alpha
* --------------------------------------------------------------------------
* Arguments: string (I) char * to null-terminated string in which
* firstoccurrence of delim will be found
* texchr (I) char * to null-terminated string that
* will be searched for
* --------------------------------------------------------------------------
* Returns: ( char * ) ptr to first char of texchr in string
* or NULL if not found or for any error.
* --------------------------------------------------------------------------
* Notes: o texchr should contain its leading \, e.g., "\\left"
* ======================================================================= */
/* --- entry point --- */
char *strtexchr ( char *string, char *texchr )
{
/* -------------------------------------------------------------------------
Allocations and Declarations
-------------------------------------------------------------------------- */
char delim, *ptexchr=(char *)NULL; /* ptr returned to caller*/
char *pstring = string; /* start or continue up search here*/
int texchrlen = (texchr==NULL?0:strlen(texchr)); /* #chars in texchr */
/* -------------------------------------------------------------------------
locate texchr in string
-------------------------------------------------------------------------- */
if ( string != (char *)NULL /* check that we got input string */
&& texchrlen > 0 ) /* and a texchr to search for */
while ( (ptexchr=strstr(pstring,texchr)) /* look for texchr in string */
!= (char *)NULL ) /* found it */
if ( (delim = ptexchr[texchrlen]) /* char immediately after texchr */
== '\000' ) break; /* texchr at very end of string */
else /* if there are chars after texchr */
if ( isalpha(delim) /*texchr is prefix of longer symbol*/
|| 0 ) /* other tests to be determined */
pstring = ptexchr + texchrlen; /* continue search after texchr */
else /* passed all tests */
break; /*so return ptr to texchr to caller*/
return ( ptexchr ); /* ptr to texchar back to caller */
} /* --- end-of-function strtexchr() --- */
/* ==========================================================================
* Function: findbraces ( char *expression, char *command )
* Purpose: If expression!=NULL, finds opening left { preceding command;
* if expression==NULL, finds closing right } after command.
* For example, to parse out {a+b\over c+d} call findbraces()
* twice.
* --------------------------------------------------------------------------
* Arguments: expression (I) NULL to find closing right } after command,
* or char * to null-terminated string to find
* left opening { preceding command.
* command (I) char * to null-terminated string whose
* first character is usually the \ of \command
* --------------------------------------------------------------------------
* Returns: ( char * ) ptr to either opening { or closing },
* or NULL for any error.
* --------------------------------------------------------------------------
* Notes: o
* ======================================================================= */
/* --- entry point --- */
char *findbraces ( char *expression, char *command )
{
/* -------------------------------------------------------------------------
Allocations and Declarations
-------------------------------------------------------------------------- */
int isopen = (expression==NULL?0:1); /* true to find left opening { */
char *left="{", *right="}", /* delims bracketing {x\command y} */
*delim = (isopen?left:right), /* delim we want, { if isopen */
*match = (isopen?right:left), /* matching delim, } if isopen */
*brace = NULL; /* ptr to delim returned to caller */
int inc = (isopen?-1:+1); /* pointer increment */
int level = 1; /* nesting level, for {{}\command} */
char *ptr = command; /* start search here */
int setbrace = 1; /* true to set {}'s if none found */
/* -------------------------------------------------------------------------
search for left opening { before command, or right closing } after command
-------------------------------------------------------------------------- */
while ( 1 ) /* search for brace, or until end */
{
/* --- next char to check for delim --- */
ptr += inc; /* bump ptr left or right */
/* --- check for beginning or end of expression --- */
if ( isopen ) /* going left, check for beginning */
{ if ( ptr < expression ) break; } /* went before start of string */
else { if ( *ptr == '\000' ) break; } /* went past end of string */
/* --- don't check this char if it's escaped --- */
if ( !isopen || ptr>expression ) /* very first char can't be escaped*/
if ( isthischar(*(ptr-1),ESCAPE) ) /* escape char precedes current */
continue; /* so don't check this char */
/* --- check for delim --- */
if ( isthischar(*ptr,delim) ) /* found delim */
if ( --level == 0 ) /* and it's not "internally" nested*/
{ brace = ptr; /* set ptr to brace */
goto end_of_job; } /* and return it to caller */
/* --- check for matching delim --- */
if ( isthischar(*ptr,match) ) /* found matching delim */
level++; /* so bump nesting level */
} /* --- end-of-while(1) --- */
end_of_job:
if ( brace == (char *)NULL ) /* open{ or close} not found */
if ( setbrace ) /* want to force one at start/end? */
brace = ptr; /* { before expressn, } after cmmnd*/
return ( brace ); /*back to caller with delim or NULL*/
} /* --- end-of-function findbraces() --- */
#endif /* PART2 */
/* ---
* PART3
* ------ */
#if !defined(PARTS) || defined(PART3)
/* ==========================================================================
* Function: rasterize ( expression, size )
* Purpose: returns subraster corresponding to (a valid LaTeX) expression
* at font size
* --------------------------------------------------------------------------
* Arguments: expression (I) char * to first char of null-terminated
* string containing valid LaTeX expression
* to be rasterized
* size (I) int containing 0-4 default font size
* --------------------------------------------------------------------------
* Returns: ( subraster * ) ptr to subraster corresponding to expression,
* or NULL for any parsing error.
* --------------------------------------------------------------------------
* Notes: o This is mimeTeX's "main" reusable entry point. Easy to use:
* just call it with a LaTeX expression, and get back a bitmap
* of that expression. Then do what you want with the bitmap.
* ======================================================================= */
/* --- entry point --- */
subraster *rasterize ( char *expression, int size )
{
/* -------------------------------------------------------------------------
Allocations and Declarations
-------------------------------------------------------------------------- */
char *preamble(), pretext[256]; /* process preamble, if present */
char chartoken[8192], *texsubexpr(), /*get subexpression from expression*/
*subexpr = chartoken; /* token may be parenthesized expr */
int isbrace(); /* check subexpr for braces */
mathchardef *symdef, *get_symdef(); /*get mathchardef struct for symbol*/
int natoms=0; /* #atoms/tokens processed so far */
int type_raster(); /* display debugging output */
subraster *rasterize(), /* recurse */
*rastparen(), /* handle parenthesized subexpr's */
*rastlimits(); /* handle sub/superscripted expr's */
subraster *rastcat(), /* concatanate atom subrasters */
*subrastcpy(), /* copy final result if a charaster*/
*new_subraster(); /* new subraster for isstring mode */
subraster *get_charsubraster(), /* character subraster */
*sp=NULL, *prevsp=NULL, /* raster for current, prev char */
*expraster = (subraster *)NULL; /* raster returned to caller */
int delete_subraster(); /* free everything before returning*/
/*int pixsz = 1;*/ /*default #bits per pixel, 1=bitmap*/
/* --- global values saved/restored at each recursive iteration --- */
int wasstring = isstring, /* initial isstring mode flag */
wasdisplaystyle = isdisplaystyle, /*initial displaystyle mode flag*/
oldfontnum = fontnum, /* initial font family */
oldfontsize = fontsize, /* initial fontsize */
olddisplaysize = displaysize, /* initial \displaystyle size */
oldshrinkfactor = shrinkfactor, /* initial shrinkfactor */
oldsmashmargin = smashmargin, /* initial smashmargin */
oldissmashdelta = issmashdelta, /* initial issmashdelta */
*oldworkingparam = workingparam; /* initial working parameter */
subraster *oldworkingbox = workingbox, /* initial working box */
*oldleftexpression = leftexpression; /*left half rasterized so far*/
double oldunitlength = unitlength; /* initial unitlength */
mathchardef *oldleftsymdef = leftsymdef; /* init oldleftsymdef */
/* -------------------------------------------------------------------------
initialization
-------------------------------------------------------------------------- */
recurlevel++; /* wind up one more recursion level*/
leftexpression = NULL; /* no leading left half yet */
isreplaceleft = 0; /* reset replaceleft flag */
/* shrinkfactor = shrinkfactors[max2(0,min2(size,LARGESTSIZE))];*/ /*set sf*/
shrinkfactor = shrinkfactors[max2(0,min2(size,16))]; /* have 17 sf's */
if ( msgfp!=NULL && msglevel >= 29 ) /*display expression for debugging*/
{ fprintf(msgfp,
"rasterize> recursion level=%d, size=%d,\n\texpression=\"%s\"\n",
recurlevel,size,(expression==NULL?"null":expression)); fflush(msgfp); }
if ( expression == NULL ) goto end_of_job; /* nothing given to do */
/* -------------------------------------------------------------------------
preocess optional $-terminated preamble preceding expression
-------------------------------------------------------------------------- */
expression = preamble(expression,&size,pretext); /* size may be modified */
if ( *expression == '\000' ) goto end_of_job; /* nothing left to do */
fontsize = size; /* start at requested size */
if ( isdisplaystyle == 1 ) /* displaystyle enabled but not set*/
if ( !ispreambledollars ) /* style fixed by $$...$$'s */
isdisplaystyle = (fontsize>=displaysize? 2:1); /*force at large fontsize*/
/* -------------------------------------------------------------------------
build up raster one character (or subexpression) at a time
-------------------------------------------------------------------------- */
while ( 1 )
{
/* --- get next character/token or subexpression --- */
expression = texsubexpr(expression,chartoken,0,LEFTBRACES,RIGHTBRACES,1,1);
subexpr = chartoken; /* "local" copy of chartoken ptr */
leftsymdef = NULL; /* no character identified yet */
sp = NULL; /* no subraster yet */
size = fontsize; /* in case reset by \tiny, etc */
/* --- debugging output --- */
if ( msgfp!=NULL && msglevel >= 999 ) /* display chartoken for debugging */
{ fprintf(msgfp,"rasterize> recursion level=%d, atom#%d = \"%s\"\n",
recurlevel,natoms+1,chartoken); fflush(msgfp); }
if ( expression == NULL /* no more tokens */
&& *subexpr == '\000' ) break; /* and this token empty */
if ( *subexpr == '\000' ) break; /* enough if just this token empty */
/* --- check for parenthesized subexpression --- */
if ( isbrace(subexpr,LEFTBRACES,1) ) /* got parenthesized subexpression */
{ if ( (sp=rastparen(&subexpr,size,prevsp)) /* rasterize subexpression */
== NULL ) continue; } /* flush it if failed to rasterize */
else /* --- single-character atomic token --- */
if ( !isthischar(*subexpr,SCRIPTS) ) /* scripts handled below */
{
/* --- first look up mathchardef for atomic token in table --- */
if ( (leftsymdef=symdef=get_symdef(chartoken)) /*mathchardef for token*/
== NULL ) /* lookup failed */
{ char literal[512] = "[?]"; /*display for unrecognized literal*/
int oldfontnum = fontnum; /* error display in default mode */
if ( msgfp!=NULL && msglevel >= 29 ) /* display unrecognized symbol */
{ fprintf(msgfp,"rasterize> get_symdef() failed for \"%s\"\n",
chartoken); fflush(msgfp); }
sp = (subraster *)NULL; /* init to signal failure */
if ( warninglevel < 1 ) continue; /* warnings not wanted */
fontnum = 0; /* reset from \mathbb, etc */
if ( isthischar(*chartoken,ESCAPE) ) /* we got unrecognized \escape */
{ /* --- so display literal {\rm~[\backslash~chartoken?]} --- */
strcpy(literal,"{\\rm~[\\backslash~"); /* init token */
strcat(literal,chartoken+1); /* add chars following leading \ */
strcat(literal,"?]}"); } /* add closing brace */
sp = rasterize(literal,size-1); /* rasterize literal token */
fontnum = oldfontnum; /* reset font family */
if ( sp == (subraster *)NULL ) continue; } /*flush if rasterize fails*/
else /* --- check if we have special handler to process this token --- */
if ( symdef->handler != NULL ) /* have a handler for this token */
{ int arg1=symdef->charnum, arg2=symdef->family, arg3=symdef->class;
if ( (sp = (subraster *) /* returned void* is subraster* */
(*(symdef->handler))(&expression,size,prevsp,arg1,arg2,arg3))== NULL )
continue; } /* flush token if handler failed */
else /* --- no handler, so just get subraster for this character --- */
if ( !isstring ) /* rasterizing */
{ if ( (sp=get_charsubraster(symdef,size)) /* get subraster */
== NULL ) continue; } /* flush token if failed */
else /* constructing ascii string */
{ char *symbol = symdef->symbol; /* symbol for ascii string */
int symlen = (symbol!=NULL?strlen(symbol):0); /*#chars in symbol*/
if ( symlen < 1 ) continue; /* no symbol for ascii string */
if ( (sp=new_subraster(symlen+1,1,8)) /* subraster for symbol */
== NULL ) continue; /* flush token if malloc failed */
sp->type = ASCIISTRING; /* set subraster type */
sp->symdef = symdef; /* and set symbol definition */
sp->baseline = 1; /* default (should be unused) */
strcpy((char *)((sp->image)->pixmap),symbol); /* copy symbol */
/*((char *)((sp->image)->pixmap))[symlen] = '\000';*/ } /*null*/
} /* --- end-of-if/else ... if/else --- */
/* --- handle any super/subscripts following symbol or subexpression --- */
sp = rastlimits(&expression,size,sp);
/* --- debugging output --- */
if ( msgfp!=NULL && msglevel >= 999 ) /* display raster for debugging */
{ fprintf(msgfp,"rasterize> recursion level=%d, atom#%d%s\n",
recurlevel,natoms+1,(sp==NULL?" = null":"..."));
if(sp!=NULL) type_raster(sp->image,msgfp); /* display raster */
fflush(msgfp); } /* flush msgfp buffer */
/* --- accumulate atom or parenthesized subexpression --- */
if ( natoms < 1 /* nothing previous to concat */
|| expraster == NULL /* or previous was complete error */
|| isreplaceleft ) /* or we're replacing previous */
{ if ( 1 && expraster!=NULL ) /* probably replacing left */
delete_subraster(expraster); /* so first free original left */
expraster = subrastcpy(sp); /* copy static CHARASTER or left */
isreplaceleft = 0; } /* reset replacement flag */
else /*we've already built up atoms so...*/
if ( sp != NULL ) /* ...if we have a new component */
expraster = rastcat(expraster,sp,1); /* concat new one, free previous */
delete_subraster(prevsp); /* free prev (if not a CHARASTER) */
prevsp = sp; /* current becomes previous */
leftexpression = expraster; /* left half rasterized so far */
/* --- bump count --- */
natoms++; /* bump #atoms count */
} /* --- end-of-while(expression!=NULL) --- */
/* -------------------------------------------------------------------------
back to caller with rasterized expression
-------------------------------------------------------------------------- */
end_of_job:
delete_subraster(prevsp); /* free last (if not a CHARASTER) */
/* --- debugging output --- */
if ( msgfp!=NULL && msglevel >= 999 ) /* display raster for debugging */
{ fprintf(msgfp,"rasterize> Final recursion level=%d, atom#%d...\n",
recurlevel,natoms);
if ( expraster != (subraster *)NULL ) /* i.e., if natoms>0 */
type_raster(expraster->image,msgfp); /* display completed raster */
fflush(msgfp); } /* flush msgfp buffer */
/* --- set final raster buffer --- */
if ( 1 && expraster != (subraster *)NULL ) /* have an expression */
{ expraster->type = IMAGERASTER; /* set type to constructed image */
if ( istextmode ) /* but in text mode */
expraster->type = blanksignal; /* set type to avoid smash */
expraster->size = fontsize; } /* set original input font size */
/* --- restore flags/values to original saved values --- */
isstring = wasstring; /* string mode reset */
isdisplaystyle = wasdisplaystyle; /* displaystyle mode reset */
fontnum = oldfontnum; /* font family reset */
fontsize = oldfontsize; /* fontsize reset */
displaysize = olddisplaysize; /* \displaystyle size reset */
shrinkfactor = oldshrinkfactor; /* shrinkfactor reset */
smashmargin = oldsmashmargin; /* smashmargin reset */
issmashdelta = oldissmashdelta; /* issmashdelta reset */
workingparam = oldworkingparam; /* working parameter reset */
workingbox = oldworkingbox; /* working box reset */
leftexpression = oldleftexpression; /* leftexpression reset */
leftsymdef = oldleftsymdef; /* leftsymdef reset */
unitlength = oldunitlength; /* unitlength reset */
recurlevel--; /* unwind one recursion level */
/* --- return final subraster to caller --- */
return ( expraster );
} /* --- end-of-function rasterize() --- */
/* ==========================================================================
* Function: rastparen ( subexpr, size, basesp )
* Purpose: parentheses handler, returns a subraster corresponding to
* parenthesized subexpression at font size
* --------------------------------------------------------------------------
* Arguments: subexpr (I) char ** to first char of null-terminated
* string beginning with a LEFTBRACES
* to be rasterized
* size (I) int containing 0-5 default font size
* basesp (I) subraster * to character (or subexpression)
* immediately preceding leading left{
* (unused, but passed for consistency)
* --------------------------------------------------------------------------
* Returns: ( subraster * ) ptr to subraster corresponding to subexpr,
* or NULL for any parsing error
* --------------------------------------------------------------------------
* Notes: o This "handler" isn't in the mathchardef symbol table,
* but is called directly from rasterize(), as necessary.
* o Though subexpr is returned unchanged, it's passed as char **
* for consistency with other handlers. Ditto, basesp is unused
* but passed for consistency
* ======================================================================= */
/* --- entry point --- */
subraster *rastparen ( char **subexpr, int size, subraster *basesp )
{
/* -------------------------------------------------------------------------
Allocations and Declarations
-------------------------------------------------------------------------- */
char *expression = *subexpr; /* dereference subexpr to get char* */
int explen = strlen(expression); /* total #chars, including parens */
int isescape = 0, /* true if parens \escaped */
isrightdot = 0, /* true if right paren is \right. */
isleftdot = 0; /* true if left paren is \left. */
char left[16], right[16]; /* parens enclosing expresion */
char noparens[8192]; /* get subexpr without parens */
subraster *rasterize(), *sp=NULL; /* rasterize what's between ()'s */
int isheight = 1; /*true=full height, false=baseline*/
int height, /* height of rasterized noparens[] */
baseline; /* and its baseline */
int family = /*CMSYEX*/ CMEX10; /* family for paren chars */
subraster *get_delim(), *lp=NULL, *rp=NULL; /* left and right paren chars */
subraster *rastcat(); /* concatanate subrasters */
int delete_subraster(); /*in case of error after allocation*/
/* -------------------------------------------------------------------------
rasterize "interior" of expression, i.e., without enclosing parens
-------------------------------------------------------------------------- */
/* --- first see if enclosing parens are \escaped --- */
if ( isthischar(*expression,ESCAPE) ) /* expression begins with \escape */
isescape = 1; /* so set flag accordingly */
/* --- get expression *without* enclosing parens --- */
strcpy(noparens,expression); /* get local copy of expression */
noparens[explen-(1+isescape)] = '\000'; /* null-terminate before right} */
strcpy(noparens,noparens+(1+isescape)); /* and then squeeze out left{ */
/* --- rasterize it --- */
if ( (sp = rasterize(noparens,size)) /*rasterize "interior" of expression*/
== NULL ) goto end_of_job; /* quit if failed */
/* --- no need to add parentheses for unescaped { --- */
if ( !isescape && isthischar(*expression,"{") ) /* don't add parentheses */
goto end_of_job; /* just return sp to caller */
/* -------------------------------------------------------------------------
obtain paren characters to enclose noparens[] raster with
-------------------------------------------------------------------------- */
/* --- first get left and right parens from expression --- */
memset(left,0,16); memset(right,0,16); /* init parens with nulls */
left[0] = *(expression+isescape); /* left{ is 1st or 2nd char */
right[0] = *(expression+explen-1); /* right} is always last char */
isleftdot = (isescape && isthischar(*left,".")); /* true if \left. */
isrightdot = (isescape && isthischar(*right,".")); /* true if \right. */
/* --- need height of noparens[] raster as minimum parens height --- */
height = (sp->image)->height; /* height of noparens[] raster */
baseline = sp->baseline; /* baseline of noparens[] raster */
if ( !isheight ) height = baseline+1; /* parens only enclose baseline up */
/* --- get best-fit parentheses characters --- */
if ( !isleftdot ) /* if not \left. */
lp = get_delim(left,height+1,family); /* get left paren char */
if ( !isrightdot ) /* and if not \right. */
rp = get_delim(right,height+1,family); /* get right paren char */
if ( (lp==NULL && !isleftdot) /* check that we got left( */
|| (rp==NULL && !isrightdot) ) /* and right) if needed */
{ delete_subraster(sp); /* if failed, free subraster */
if ( lp != NULL ) free ((void *)lp);/*free left-paren subraster envelope*/
if ( rp != NULL ) free ((void *)rp);/*and right-paren subraster envelope*/
sp = (subraster *)NULL; /* signal error to caller */
goto end_of_job; } /* and quit */
/* -------------------------------------------------------------------------
set paren baselines to center on noparens[] raster, and concat components
-------------------------------------------------------------------------- */
/* --- set baselines to center paren chars on raster --- */
if ( lp != NULL ) /* ignore for \left. */
lp->baseline = baseline + ((lp->image)->height - height)/2;
if ( rp != NULL ) /* ignore for \right. */
rp->baseline = baseline + ((rp->image)->height - height)/2;
/* --- concat lp||sp||rp to obtain final result --- */
if ( lp != NULL ) /* ignore \left. */
sp = rastcat(lp,sp,3); /* concat lp||sp and free sp,lp */
if ( sp != NULL ) /* succeeded or ignored \left. */
if ( rp != NULL ) /* ignore \right. */
sp = rastcat(sp,rp,3); /* concat sp||rp and free sp,rp */
/* --- back to caller --- */
end_of_job:
return ( sp );
} /* --- end-of-function rastparen() --- */
/* ==========================================================================
* Function: rastlimits ( expression, size, basesp )
* Purpose: \limits, \nolimts, _ and ^ handler,
* dispatches call to rastscripts() or to rastdispmath()
* as necessary, to handle sub/superscripts following symbol
* --------------------------------------------------------------------------
* Arguments: expression (I) char ** to first char of null-terminated
* LaTeX expression (unused/unchanged)
* size (I) int containing base font size (not used,
* just stored in subraster)
* basesp (I) subraster * to current character (or
* subexpression) immediately preceding script
* indicator
* --------------------------------------------------------------------------
* Returns: ( subraster * ) ptr to subraster returned by rastscripts()
* or rastdispmath(), or NULL for any error
* --------------------------------------------------------------------------
* Notes: o
* ======================================================================= */
/* --- entry point --- */
subraster *rastlimits ( char **expression, int size, subraster *basesp )
{
/* -------------------------------------------------------------------------
Allocations and Declarations
-------------------------------------------------------------------------- */
subraster *rastscripts(), *rastdispmath(), /*one of these will do the work*/
*rastcat(), /* may need to concat scripts */
*scriptsp = basesp; /* and this will become the result */
int isdisplay = (-1); /* set 1 for displaystyle, else 0 */
int oldsmashmargin = smashmargin; /* save original smashmargin */
int type_raster(); /* display debugging output */
/* --- to check for \limits or \nolimits preceding scripts --- */
char *texchar(), *exprptr=*expression, limtoken[255]; /*check for \limits*/
int toklen=0; /* strlen(limtoken) */
mathchardef *tokdef, *get_symdef(); /* mathchardef struct for limtoken */
int class=(leftsymdef==NULL?NOVALUE:leftsymdef->class); /*base sym class*/
/* -------------------------------------------------------------------------
determine whether or not to use displaymath
-------------------------------------------------------------------------- */
scriptlevel++; /* first, increment subscript level*/
*limtoken = '\000'; /* no token yet */
if ( msgfp!=NULL && msglevel>=999 )
{ fprintf(msgfp,"rastlimits> scriptlevel#%d exprptr=%.48s\n",
scriptlevel,(exprptr==NULL?"null":exprptr)); fflush(msgfp); }
if ( isstring ) goto end_of_job; /* no scripts for ascii string */
/* --- check for \limits or \nolimits --- */
skipwhite(exprptr); /* skip white space before \limits */
if ( exprptr != NULL ) /* expression ptr supplied */
if ( *exprptr != '\000' ) /* something in expression */
exprptr = texchar(exprptr,limtoken); /* retrieve next token */
if ( *limtoken != '\000' ) /* have token */
if ( (toklen=strlen(limtoken)) >= 3 ) /* which may be \[no]limits */
if ( memcmp("\\limits",limtoken,toklen) == 0 /* may be \limits */
|| memcmp("\\nolimits",limtoken,toklen) == 0 ) /* or may be \nolimits */
if ( (tokdef= get_symdef(limtoken)) /* look up token to be sure */
!= NULL ) /* found token in table */
if ( strcmp("\\limits",tokdef->symbol) == 0 ) /* found \limits */
isdisplay = 1; /* so explicitly set displaymath */
else /* wasn't \limits */
if ( strcmp("\\nolimits",tokdef->symbol) == 0 ) /* found \nolimits */
isdisplay = 0; /* so explicitly reset displaymath */
/* --- see if we found \[no]limits --- */
if ( isdisplay != (-1) ) /* explicit directive found */
*expression = exprptr; /* so bump expression past it */
else /* noexplicit directive */
{ isdisplay = 0; /* init displaymath flag off */
if ( isdisplaystyle ) /* we're in displaystyle math mode */
if ( isdisplaystyle >= 5 ) /* and mode irrevocably forced true */
{ if ( class!=OPENING && class!=CLOSING ) /*don't force ('s and )'s*/
isdisplay = 1; } /* set flag if mode forced true */
else
if ( isdisplaystyle >= 2 ) /*or mode forced conditionally true*/
{ if ( class!=VARIABLE && class!=ORDINARY /*don't force characters*/
&& class!=OPENING && class!=CLOSING /*don't force ('s and )'s*/
&& class!=BINARYOP /* don't force binary operators */
&& class!=NOVALUE ) /* finally, don't force "images" */
isdisplay = 1; } /* set flag if mode forced true */
else /* determine mode from base symbol */
if ( class == DISPOPER ) /* it's a displaystyle operator */
isdisplay = 1; } /* so set flag */
/* -------------------------------------------------------------------------
dispatch call to create sub/superscripts
-------------------------------------------------------------------------- */
if ( isdisplay ) /* scripts above/below base symbol */
scriptsp = rastdispmath(expression,size,basesp); /* everything all done */
else /* scripts alongside base symbol */
if ( (scriptsp=rastscripts(expression,size,basesp)) == NULL ) /*no scripts*/
scriptsp = basesp; /* so just return unscripted symbol*/
else /* symbols followed by scripts */
if ( basesp != NULL ) /* have base symbol */
{ smashmargin = 0; /* don't smash script */
/*scriptsp = rastcat(basesp,scriptsp,2);*//*concat scripts to base sym*/
scriptsp = rastcat(basesp,scriptsp,3); /*concat scripts to base sym*/
scriptsp->type = IMAGERASTER; /* flip type of composite object */
scriptsp->size = size; } /* and set font size */
end_of_job:
smashmargin = oldsmashmargin; /* reset original smashmargin */
if ( msgfp!=NULL && msglevel>=99 )
{ fprintf(msgfp,"rastlimits> scriptlevel#%d returning %s\n",
scriptlevel,(scriptsp==NULL?"null":"..."));
if ( scriptsp != NULL ) /* have a constructed raster */
type_raster(scriptsp->image,msgfp); /*display constructed raster*/
fflush(msgfp); }
scriptlevel--; /*lastly, decrement subscript level*/
return ( scriptsp );
} /* --- end-of-function rastlimits() --- */
/* ==========================================================================
* Function: rastscripts ( expression, size, basesp )
* Purpose: super/subscript handler, returns subraster for the leading
* scripts in expression, whose base symbol is at font size
* --------------------------------------------------------------------------
* Arguments: expression (I/O) char ** to first char of null-terminated
* string beginning with a super/subscript,
* and returning ptr immediately following
* last script character processed.
* size (I) int containing 0-4 default font size
* basesp (I) subraster * to character (or subexpression)
* immediately preceding leading script
* (scripts will be placed relative to base)
* --------------------------------------------------------------------------
* Returns: ( subraster * ) ptr to subraster corresponding to scripts,
* or NULL for any parsing error
* --------------------------------------------------------------------------
* Notes: o This "handler" isn't in the mathchardef symbol table,
* but is called directly from rasterize(), as necessary.
* ======================================================================= */
/* --- entry point --- */
subraster *rastscripts ( char **expression, int size, subraster *basesp )
{
/* -------------------------------------------------------------------------
Allocations and Declarations
-------------------------------------------------------------------------- */
char *texscripts(), /* parse expression for scripts */
subscript[512], supscript[512]; /* scripts parsed from expression */
subraster *rasterize(), *subsp=NULL, *supsp=NULL; /* rasterize scripts */
subraster *new_subraster(), *sp=NULL, /* super- over subscript subraster */
*rastack(); /*sets scripts in displaymath mode*/
raster *rp=NULL; /* image raster embedded in sp */
int height=0, width=0, baseline=0, /* height,width,baseline of sp */
subht=0, subwidth=0, subln=0, /* height,width,baseline of sub */
supht=0, supwidth=0, supln=0, /* height,width,baseline of sup */
baseht=0, baseln=0; /* height,baseline of base */
int bdescend=0, sdescend=0; /* descender of base, subscript */
int issub=0, issup=0, isboth=0, /* true if we have sub,sup,both */
isbase=0; /* true if we have base symbol */
int szval = min2(max2(size,0),LARGESTSIZE), /* 0...LARGESTSIZE */
vbetween = 2, /* vertical space between scripts */
vabove = szval+1, /*sup's top/bot above base's top/bot*/
vbelow = szval+1, /*sub's top/bot below base's top/bot*/
vbottom = szval+1; /*sup's bot above (sub's below) bsln*/
/*int istweak = 1;*/ /* true to tweak script positioning */
int rastput(); /*put scripts in constructed raster*/
int delete_subraster(); /* free work areas */
int pixsz = 1; /*default #bits per pixel, 1=bitmap*/
/* -------------------------------------------------------------------------
Obtain subscript and/or superscript expressions, and rasterize them/it
-------------------------------------------------------------------------- */
/* --- parse for sub,superscript(s), and bump expression past it(them) --- */
if ( expression == NULL ) goto end_of_job; /* no *ptr given */
if ( *expression == NULL ) goto end_of_job; /* no expression given */
if ( *(*expression) == '\000' ) goto end_of_job; /* nothing in expression */
*expression = texscripts(*expression,subscript,supscript,3);
/* --- rasterize scripts --- */
if ( *subscript != '\000' ) /* have a subscript */
subsp = rasterize(subscript,size-1); /* so rasterize it at size-1 */
if ( *supscript != '\000' ) /* have a superscript */
supsp = rasterize(supscript,size-1); /* so rasterize it at size-1 */
/* --- set flags for convenience --- */
issub = (subsp != (subraster *)NULL); /* true if we have subscript */
issup = (supsp != (subraster *)NULL); /* true if we have superscript */
isboth = (issub && issup); /* true if we have both */
if (!issub && !issup) goto end_of_job; /* quit if we have neither */
/* -------------------------------------------------------------------------
get height, width, baseline of scripts, and height, baseline of base symbol
-------------------------------------------------------------------------- */
/* --- get height and width of components --- */
if ( issub ) /* we have a subscript */
{ subht = (subsp->image)->height; /* so get its height */
subwidth = (subsp->image)->width; /* and width */
subln = subsp->baseline; } /* and baseline */
if ( issup ) /* we have a superscript */
{ supht = (supsp->image)->height; /* so get its height */
supwidth = (supsp->image)->width; /* and width */
supln = supsp->baseline; } /* and baseline */
/* --- get height and baseline of base, and descender of base and sub --- */
if ( basesp == (subraster *)NULL ) /* no base symbol for scripts */
basesp = leftexpression; /* try using left side thus far */
if ( basesp != (subraster *)NULL ) /* we have base symbol for scripts */
{ baseht = (basesp->image)->height; /* height of base symbol */
baseln = basesp->baseline; /* and its baseline */
bdescend = baseht-(baseln+1); /* and base symbol descender */
sdescend = bdescend + vbelow; /*sub must descend by at least this*/
if ( baseht > 0 ) isbase = 1; } /* set flag */
/* -------------------------------------------------------------------------
determine width of constructed raster
-------------------------------------------------------------------------- */
width = max2(subwidth,supwidth); /*widest component is overall width*/
/* -------------------------------------------------------------------------
determine height and baseline of constructed raster
-------------------------------------------------------------------------- */
/* --- both super/subscript --- */
if ( isboth ) /*we have subscript and superscript*/
{ height = max2(subht+vbetween+supht, /* script heights + space bewteen */
vbelow+baseht+vabove); /*sub below base bot, sup above top*/
baseline = baseln + (height-baseht)/2; } /*center scripts on base symbol*/
/* --- superscript only --- */
if ( !issub ) /* we only have a superscript */
{ height = max3(baseln+1+vabove, /* sup's top above base symbol top */
supht+vbottom, /* sup's bot above baseln */
supht+vabove-bdescend); /* sup's bot above base symbol bot */
baseline = height-1; } /*sup's baseline at bottom of raster*/
/* --- subscript only --- */
if ( !issup ) /* we only have a subscript */
if ( subht > sdescend ) /*sub can descend below base bot...*/
{ height = subht; /* ...without extra space on top */
baseline = height-(sdescend+1); /* sub's bot below base symbol bot */
baseline = min2(baseline,max2(baseln-vbelow,0)); }/*top below base top*/
else /* sub's top will be below baseln */
{ height = sdescend+1; /* sub's bot below base symbol bot */
baseline = 0; } /* sub's baseline at top of raster */
/* -------------------------------------------------------------------------
construct raster with superscript over subscript
-------------------------------------------------------------------------- */
/* --- allocate subraster containing constructed raster --- */
if ( (sp=new_subraster(width,height,pixsz)) /*allocate subraster and raster*/
== NULL ) /* and if we fail to allocate */
goto end_of_job; /* quit */
/* --- initialize subraster parameters --- */
sp->type = IMAGERASTER; /* set type as constructed image */
sp->size = size; /* set given size */
sp->baseline = baseline; /* composite scripts baseline */
rp = sp->image; /* raster embedded in subraster */
/* --- place super/subscripts in new raster --- */
if ( issup ) /* we have a superscript */
rastput(rp,supsp->image,0,0,1); /* it goes in upper-left corner */
if ( issub ) /* we have a subscript */
rastput(rp,subsp->image,height-subht,0,1); /*in lower-left corner*/
/* -------------------------------------------------------------------------
free unneeded component subrasters and return final result to caller
-------------------------------------------------------------------------- */
end_of_job:
if ( issub ) delete_subraster(subsp); /* free unneeded subscript */
if ( issup ) delete_subraster(supsp); /* and superscript */
return ( sp );
} /* --- end-of-function rastscripts() --- */
/* ==========================================================================
* Function: rastdispmath ( expression, size, sp )
* Purpose: displaymath handler, returns sp along with
* its immediately following super/subscripts
* --------------------------------------------------------------------------
* Arguments: expression (I/O) char ** to first char of null-terminated
* string immediately following sp to be
* rasterized along with its super/subscripts,
* and returning ptr immediately following last
* character processed.
* size (I) int containing 0-4 default font size
* sp (I) subraster * to display math operator
* to which super/subscripts will be added
* --------------------------------------------------------------------------
* Returns: ( subraster * ) ptr to subraster corresponding to sp
* plus its scripts, or NULL for any error
* --------------------------------------------------------------------------
* Notes: o sp returned unchanged if no super/subscript(s) follow it.
* ======================================================================= */
/* --- entry point --- */
subraster *rastdispmath ( char **expression, int size, subraster *sp )
{
/* -------------------------------------------------------------------------
Allocations and Declarations
-------------------------------------------------------------------------- */
char *texscripts(), /* parse expression for scripts */
subscript[512], supscript[512]; /* scripts parsed from expression */
int issub=0, issup=0; /* true if we have sub,sup */
subraster *rasterize(), *subsp=NULL, *supsp=NULL, /* rasterize scripts */
*rastack(), /* stack operator with scripts */
*new_subraster(); /* for dummy base sp, if needed */
int vspace = 1; /* vertical space between scripts */
/* -------------------------------------------------------------------------
Obtain subscript and/or superscript expressions, and rasterize them/it
-------------------------------------------------------------------------- */
/* --- parse for sub,superscript(s), and bump expression past it(them) --- */
if ( expression == NULL ) goto end_of_job; /* no *ptr given */
if ( *expression == NULL ) goto end_of_job; /* no expression given */
if ( *(*expression) == '\000' ) goto end_of_job; /* nothing in expression */
*expression = texscripts(*expression,subscript,supscript,3);
/* --- rasterize scripts --- */
if ( *subscript != '\000' ) /* have a subscript */
subsp = rasterize(subscript,size-1); /* so rasterize it at size-1 */
if ( *supscript != '\000' ) /* have a superscript */
supsp = rasterize(supscript,size-1); /* so rasterize it at size-1 */
/* --- set flags for convenience --- */
issub = (subsp != (subraster *)NULL); /* true if we have subscript */
issup = (supsp != (subraster *)NULL); /* true if we have superscript */
if (!issub && !issup) goto end_of_job; /*return operator alone if neither*/
/* -------------------------------------------------------------------------
stack operator and its script(s)
-------------------------------------------------------------------------- */
/* --- stack superscript atop operator --- */
if ( issup ) /* we have a superscript */
if ( sp == NULL ) /* but no base expression */
sp = supsp; /* so just use superscript */
else /* have base and superscript */
if ( (sp=rastack(sp,supsp,1,vspace,1,3)) /* stack supsp atop base sp */
== NULL ) goto end_of_job; /* and quit if failed */
/* --- stack operator+superscript atop subscript --- */
if ( issub ) /* we have a subscript */
if ( sp == NULL ) /* but no base expression */
sp = subsp; /* so just use subscript */
else /* have base and subscript */
if ( (sp=rastack(subsp,sp,2,vspace,1,3)) /* stack sp atop base subsp */
== NULL ) goto end_of_job; /* and quit if failed */
sp->type = IMAGERASTER; /* flip type of composite object */
sp->size = size; /* and set font size */
/* -------------------------------------------------------------------------
free unneeded component subrasters and return final result to caller
-------------------------------------------------------------------------- */
end_of_job:
return ( sp );
} /* --- end-of-function rastdispmath() --- */
/* ==========================================================================
* Function: rastleft ( expression, size, basesp, ildelim, arg2, arg3 )
* Purpose: \left...\right handler, returns a subraster corresponding to
* delimited subexpression at font size
* --------------------------------------------------------------------------
* Arguments: expression (I) char ** to first char of null-terminated
* string beginning with a \left
* to be rasterized
* size (I) int containing 0-5 default font size
* basesp (I) subraster * to character (or subexpression)
* immediately preceding leading left{
* (unused, but passed for consistency)
* ildelim (I) int containing ldelims[] index of
* left delimiter
* arg2 (I) int unused
* arg3 (I) int unused
* --------------------------------------------------------------------------
* Returns: ( subraster * ) ptr to subraster corresponding to subexpr,
* or NULL for any parsing error
* --------------------------------------------------------------------------
* Notes: o
* ======================================================================= */
/* --- entry point --- */
subraster *rastleft ( char **expression, int size, subraster *basesp,
int ildelim, int arg2, int arg3 )
{
/* -------------------------------------------------------------------------
Allocations and Declarations
-------------------------------------------------------------------------- */
subraster *rasterize(), *sp=NULL; /*rasterize between \left...\right*/
subraster *get_delim(), *lp=NULL, *rp=NULL; /* left and right delim chars */
subraster *rastlimits(); /*handle sub/super scripts on lp,rp*/
subraster *rastcat(); /* concat lp||sp||rp subrasters */
int family=CMSYEX, /* get_delim() family */
height=0, rheight=0, /* subexpr, right delim height */
margin=(size+1), /* delim height margin over subexpr*/
opmargin=(5); /* extra margin for \int,\sum,\etc */
char /* *texleft(),*/ subexpr[8192]; /* chars between \left...\right */
char *texchar(), /* get delims after \left,\right */
ldelim[256]=".", rdelim[256]="."; /* delims following \left,\right */
char *strtexchr(), *pleft, *pright; /*locate \right matching our \left*/
int isleftdot=0, isrightdot=0; /* true if \left. or \right. */
int sublen=0; /* strlen(subexpr) */
int idelim=0; /* 1=left,2=right */
/* int gotldelim = 0; */ /* true if ildelim given by caller */
int delete_subraster(); /* free subraster if rastleft fails*/
int wasdisplaystyle = isdisplaystyle; /* save current displaystyle */
int istextleft=0, istextright=0; /* true for non-displaystyle delims*/
/* --- recognized delimiters --- */
static char left[16]="\\left", right[16]="\\right"; /* tex delimiters */
static char *ldelims[] = {
"unused", ".", /* 1 for \left., \right. */
"(", ")", /* 2,3 for \left(, \right) */
"\\{","\\}", /* 4,5 for \left\{, \right\} */
"[", "]", /* 6,7 for \left[, \right] */
"<", ">", /* 8,9 for \left<, \right> */
"|", "\\|", /* 10,11 for \left,\right |,\|*/
NULL };
/* --- recognized operator delimiters --- */
static char *opdelims[] = { /* operator delims from cmex10 */
"int", "sum", "prod",
"cup", "cap", "dot",
"plus", "times", "wedge",
"vee",
NULL }; /* --- end-of-opdelims[] --- */
/* --- delimiter xlation --- */
static char *xfrom[] = /* xlate any delim suffix... */
{ "\\|", /* \| */
"\\{", /* \{ */
"\\}", /* \} */
"\\lbrace", /* \lbrace */
"\\rbrace", /* \rbrace */
"\\langle", /* \langle */
"\\rangle", /* \rangle */
NULL } ; /* --- end-of-xfrom[] --- */
static char *xto[] = /* ...to this instead */
{ "=", /* \| to = */
"{", /* \{ to { */
"}", /* \} to } */
"{", /* \lbrace to { */
"}", /* \rbrace to } */
"<", /* \langle to < */
">", /* \rangle to > */
NULL } ; /* --- end-of-xto[] --- */
/* --- non-displaystyle delimiters --- */
static char *textdelims[] = /* these delims _aren't_ display */
{ "|", "=",
"(", ")",
"[", "]",
"<", ">",
"{", "}",
"dbl", /* \lbrackdbl and \rbrackdbl */
NULL } ; /* --- end-of-textdelims[] --- */
/* -------------------------------------------------------------------------
initialization
-------------------------------------------------------------------------- */
/* --- check args --- */
if ( *(*expression) == '\000' ) goto end_of_job; /* nothing after \left */
/* --- determine left delimiter, and set default \right. delimiter --- */
if ( ildelim!=NOVALUE && ildelim>=1 ) /* called with explicit left delim */
{ strcpy(ldelim,ldelims[ildelim]); /* so just get a local copy */
/* gotldelim = 1; */ } /* and set flag that we got it */
else /* trapped \left without delim */
{ skipwhite(*expression); /* interpret \left ( as \left( */
if ( *(*expression) == '\000' ) /* end-of-string after \left */
goto end_of_job; /* so return NULL */
*expression = texchar(*expression,ldelim); /*pull delim from expression*/
if ( *expression == NULL /* probably invalid end-of-string */
|| *ldelim == '\000' ) goto end_of_job; } /* no delimiter */
strcpy(rdelim,"."); /* init default \right. delim */
/* -------------------------------------------------------------------------
locate \right balancing our opening \left
-------------------------------------------------------------------------- */
/* --- first \right following \left --- */
if ( (pright=strtexchr(*expression,right)) /* look for \right after \left */
!= NULL ) { /* found it */
/* --- find matching \right by pushing past any nested \left's --- */
pleft = *expression; /* start after first \left( */
while ( 1 ) { /*break when matching \right found*/
/* -- locate next nested \left if there is one --- */
if ( (pleft=strtexchr(pleft,left)) /* find next \left */
== NULL ) break; /*no more, so matching \right found*/
pleft += strlen(left); /* push ptr past \left token */
if ( pleft >= pright ) break; /* not nested if \left after \right*/
/* --- have nested \left, so push forward to next \right --- */
if ( (pright=strtexchr(pright+strlen(right),right)) /* find next \right */
== NULL ) break; /* ran out of \right's */
} /* --- end-of-while(1) --- */
} /* --- end-of-if(pright!=NULL) --- */
/* -------------------------------------------------------------------------
push past \left(_a^b sub/superscripts, if present
-------------------------------------------------------------------------- */
pleft = *expression; /*reset pleft after opening \left( */
if ( (lp=rastlimits(expression,size,lp)) /*dummy call push expression past b*/
!= NULL ) /* found actual _a^b scripts, too */
{ delete_subraster(lp); /* but we don't need them */
lp = NULL; } /* reset pointer, too */
/* -------------------------------------------------------------------------
get \right delimiter and subexpression between \left...\right, xlate delims
-------------------------------------------------------------------------- */
/* --- get delimiter following \right --- */
if ( pright == (char *)NULL ) { /* assume \right. at end of exprssn*/
strcpy(rdelim,"."); /* set default \right. */
sublen = strlen(*expression); /* use entire remaining expression */
memcpy(subexpr,*expression,sublen); /* copy all remaining chars */
*expression += sublen; } /* and push expression to its null */
else { /* have explicit matching \right */
sublen = (int)(pright-(*expression)); /* #chars between \left...\right */
memcpy(subexpr,*expression,sublen); /* copy chars preceding \right */
*expression = pright+strlen(right); /* push expression past \right */
skipwhite(*expression); /* interpret \right ) as \right) */
*expression = texchar(*expression,rdelim); /*pull delim from expression*/
if ( *rdelim == '\000' ) strcpy(rdelim,"."); } /* \right. if no rdelim */
/* --- get subexpression between \left...\right --- */
if ( sublen < 1 ) goto end_of_job; /* nothing between delimiters */
subexpr[sublen] = '\000'; /* and null-terminate it */
/* --- adjust margin for expressions containing \middle's --- */
if ( strtexchr(subexpr,"\\middle") != NULL ) /* have enclosed \middle's */
margin = 1; /* so don't "overwhelm" them */
/* --- check for operator delimiter --- */
for ( idelim=0; opdelims[idelim]!=NULL; idelim++ )
if ( strstr(ldelim,opdelims[idelim]) != NULL ) /* found operator */
{ margin += opmargin; /* extra height for operator */
if ( *ldelim == '\\' ) /* have leading escape */
strcpy(ldelim,ldelim+1); /* squeeze it out */
break; } /* no need to check rest of table */
/* --- xlate delimiters and check for textstyle --- */
for ( idelim=1; idelim<=2; idelim++ ) { /* 1=left, 2=right */
char *lrdelim = (idelim==1? ldelim:rdelim); /* ldelim or rdelim */
int ix; char *xdelim; /* xfrom[] and xto[] index, delim */
for( ix=0; (xdelim=xfrom[ix]) != NULL; ix++ )
if ( strcmp(lrdelim,xdelim) == 0 ) /* found delim to xlate */
{ strcpy(lrdelim,xto[ix]); /* replace with corresponding xto[]*/
break; } /* no need to check further */
for( ix=0; (xdelim=textdelims[ix]) != NULL; ix++ )
if ( strstr(lrdelim,xdelim) != 0 ) /* found textstyle delim */
{ if ( idelim == 1 ) /* if it's the \left one */
istextleft = 1; /* set left textstyle flag */
else istextright = 1; /* else set right textstyle flag */
break; } /* no need to check further */
} /* --- end-of-for(idelim) --- */
/* --- debugging --- */
if ( msgfp!=NULL && msglevel>=99 )
fprintf(msgfp,"rastleft> left=\"%s\" right=\"%s\" subexpr=\"%s\"\n",
ldelim,rdelim,subexpr);
/* -------------------------------------------------------------------------
rasterize subexpression
-------------------------------------------------------------------------- */
/* --- rasterize subexpression --- */
if ( (sp = rasterize(subexpr,size)) /* rasterize chars between delims */
== NULL ) goto end_of_job; /* quit if failed */
height = (sp->image)->height; /* height of subexpr raster */
rheight = height+margin; /*default rheight as subexpr height*/
/* -------------------------------------------------------------------------
rasterize delimiters, reset baselines, and add sub/superscripts if present
-------------------------------------------------------------------------- */
/* --- check for dot delimiter --- */
isleftdot = (strchr(ldelim,'.')!=NULL); /* true if \left. */
isrightdot = (strchr(rdelim,'.')!=NULL); /* true if \right. */
/* --- get rasters for best-fit delim characters, add sub/superscripts --- */
isdisplaystyle = (istextleft?0:9); /* force \displaystyle */
if ( !isleftdot ) /* if not \left. */
{ /* --- first get requested \left delimiter --- */
lp = get_delim(ldelim,rheight,family); /* get \left delim char */
/* --- reset lp delim baseline to center delim on subexpr raster --- */
if ( lp != NULL ) /* if get_delim() succeeded */
{ int lheight = (lp->image)->height; /* actual height of left delim */
lp->baseline = sp->baseline + (lheight - height)/2;
if ( lheight > rheight ) /* got bigger delim than requested */
rheight = lheight-1; } /* make sure right delim matches */
/* --- then add on any sub/superscripts attached to \left( --- */
lp = rastlimits(&pleft,size,lp); } /*\left(_a^b and push pleft past b*/
isdisplaystyle = (istextright?0:9); /* force \displaystyle */
if ( !isrightdot ) /* and if not \right. */
{ /* --- first get requested \right delimiter --- */
rp = get_delim(rdelim,rheight,family); /* get \right delim char */
/* --- reset rp delim baseline to center delim on subexpr raster --- */
if ( rp != NULL ) /* if get_delim() succeeded */
rp->baseline = sp->baseline + ((rp->image)->height - height)/2;
/* --- then add on any sub/superscripts attached to \right) --- */
rp = rastlimits(expression,size,rp); } /*\right)_c^d, expression past d*/
isdisplaystyle = wasdisplaystyle; /* original \displystyle default */
/* --- check that we got delimiters --- */
if ( 0 )
if ( (lp==NULL && !isleftdot) /* check that we got left( */
|| (rp==NULL && !isrightdot) ) /* and right) if needed */
{ if ( lp != NULL ) free ((void *)lp); /* free \left-delim subraster */
if ( rp != NULL ) free ((void *)rp); /* and \right-delim subraster */
if (0) { delete_subraster(sp); /* if failed, free subraster */
sp = (subraster *)NULL; } /* signal error to caller */
goto end_of_job; } /* and quit */
/* -------------------------------------------------------------------------
concat lp || sp || rp components
-------------------------------------------------------------------------- */
/* --- concat lp||sp||rp to obtain final result --- */
if ( lp != NULL ) /* ignore \left. */
sp = rastcat(lp,sp,3); /* concat lp||sp and free sp,lp */
if ( sp != NULL ) /* succeeded or ignored \left. */
if ( rp != NULL ) /* ignore \right. */
sp = rastcat(sp,rp,3); /* concat sp||rp and free sp,rp */
/* --- back to caller --- */
end_of_job:
return ( sp );
} /* --- end-of-function rastleft() --- */
/* ==========================================================================
* Function: rastright ( expression, size, basesp, ildelim, arg2, arg3 )
* Purpose: ...\right handler, intercepts an unexpected/unbalanced \right
* --------------------------------------------------------------------------
* Arguments: expression (I) char ** to first char of null-terminated
* string beginning with a \right
* to be rasterized
* size (I) int containing 0-5 default font size
* basesp (I) subraster * to character (or subexpression)
* immediately preceding leading left{
* (unused, but passed for consistency)
* ildelim (I) int containing rdelims[] index of
* right delimiter
* arg2 (I) int unused
* arg3 (I) int unused
* --------------------------------------------------------------------------
* Returns: ( subraster * ) ptr to subraster corresponding to subexpr,
* or NULL for any parsing error
* --------------------------------------------------------------------------
* Notes: o
* ======================================================================= */
/* --- entry point --- */
subraster *rastright ( char **expression, int size, subraster *basesp,
int ildelim, int arg2, int arg3 )
{
/* -------------------------------------------------------------------------
Allocations and Declarations
-------------------------------------------------------------------------- */
subraster /* *rasterize(),*/ *sp=NULL; /*rasterize \right subexpr's*/
if ( sp != NULL ) /* returning entire expression */
{
isreplaceleft = 1; /* set flag to replace left half*/
}
return ( sp );
} /* --- end-of-function rastright() --- */
/* ==========================================================================
* Function: rastmiddle ( expression, size, basesp, arg1, arg2, arg3 )
* Purpose: \middle handler, returns subraster corresponding to
* entire expression with \middle delimiter(s) sized to fit.
* --------------------------------------------------------------------------
* Arguments: expression (I/O) char ** to first char of null-terminated
* string immediately following \middle to be
* rasterized, and returning ptr immediately
* to terminating null.
* size (I) int containing 0-5 default font size
* basesp (I) subraster * to character (or subexpression)
* immediately preceding \middle
* (unused, but passed for consistency)
* arg1 (I) int unused
* arg2 (I) int unused
* arg3 (I) int unused
* --------------------------------------------------------------------------
* Returns: ( subraster * ) ptr to subraster corresponding to expression,
* or NULL for any parsing error
* (expression ptr unchanged if error occurs)
* --------------------------------------------------------------------------
* Notes: o
* ======================================================================= */
/* --- entry point --- */
subraster *rastmiddle ( char **expression, int size, subraster *basesp,
int arg1, int arg2, int arg3 )
{
/* -------------------------------------------------------------------------
Allocations and Declarations
-------------------------------------------------------------------------- */
subraster *rasterize(), *sp=NULL, *subsp[32]; /*rasterize \middle subexpr's*/
char *exprptr = *expression, /* local copy of ptr to expression */
*texchar(), delim[32][132], /* delimiters following \middle's */
*strtexchr(), /* locate \middle's */
subexpr[8193], *subptr=NULL; /* subexpression between \middle's */
int height=0, habove=0, hbelow=0; /* height, above & below baseline */
int idelim, ndelims=0, /* \middle count (max 32) */
family = CMSYEX; /* delims from CMSY10 or CMEX10 */
subraster *subrastcpy(), /* copy subraster */
*rastcat(), /* concatanate subraster */
*get_delim(); /* get rasterized delimiter */
int delete_subraster(); /* free work area subsp[]'s at eoj */
/* -------------------------------------------------------------------------
initialization
-------------------------------------------------------------------------- */
subsp[0] = leftexpression; /* expressn preceding 1st \middle */
subsp[1] = NULL; /* set first null */
/* -------------------------------------------------------------------------
accumulate subrasters between consecutive \middle\delim...\middle\delim...'s
-------------------------------------------------------------------------- */
while ( ndelims < 30 ) /* max of 31 \middle's */
{
/* --- maintain max height above,below baseline --- */
if ( subsp[ndelims] != NULL ) /*exprssn preceding current \middle*/
{ int baseline = (subsp[ndelims])->baseline; /* #rows above baseline */
height = ((subsp[ndelims])->image)->height; /* tot #rows (height) */
habove = max2(habove,baseline); /* max #rows above baseline */
hbelow = max2(hbelow,height-baseline); } /* max #rows below baseline */
/* --- get delimter after \middle --- */
skipwhite(exprptr); /*skip space betwn \middle & \delim*/
exprptr = texchar(exprptr,delim[ndelims]); /* \delim after \middle */
if ( *(delim[ndelims]) == '\000' ) /* \middle at end-of-expression */
break; /* ignore it and consider job done */
ndelims++; /* count another \middle\delim */
/* --- get subexpression between \delim and next \middle --- */
subsp[ndelims] = NULL; /* no subexpresion yet */
if ( *exprptr == '\000' ) /* end-of-expression after \delim */
break; /* so we have all subexpressions */
if ( (subptr = strtexchr(exprptr,"\\middle")) /* find next \middle */
== NULL ) /* no more \middle's */
{ strncpy(subexpr,exprptr,8192); /* get entire remaining expression */
subexpr[8192] = '\000'; /* make sure it's null-terminated */
exprptr += strlen(exprptr); } /* push exprptr to terminating '\0'*/
else /* have another \middle */
{ int sublen = (int)(subptr-exprptr); /* #chars between \delim...\middle*/
memcpy(subexpr,exprptr,min2(sublen,8192)); /* get subexpression */
subexpr[min2(sublen,8192)] = '\000'; /* and null-terminate it */
exprptr += (sublen+strlen("\\middle")); } /* push exprptr past \middle*/
/* --- rasterize subexpression --- */
subsp[ndelims] = rasterize(subexpr,size); /* rasterize subexpresion */
} /* --- end-of-while(1) --- */
/* -------------------------------------------------------------------------
construct \middle\delim's and concatanate them between subexpressions
-------------------------------------------------------------------------- */
if ( ndelims < 1 /* no delims */
|| (height=habove+hbelow) < 1 ) /* or no subexpressions? */
goto end_of_job; /* just flush \middle directive */
for ( idelim=0; idelim<=ndelims; idelim++ )
{
/* --- first add on subexpression preceding delim --- */
if ( subsp[idelim] != NULL ) /* have subexpr preceding delim */
if ( sp == NULL ) /* this is first piece */
{ sp = subsp[idelim]; /* so just use it */
if ( idelim == 0 ) sp = subrastcpy(sp); } /* or copy leftexpression */
else sp = rastcat(sp,subsp[idelim],(idelim>0?3:1)); /* or concat it */
/* --- now construct delimiter --- */
if ( *(delim[idelim]) != '\000' ) /* have delimter */
{ subraster *delimsp = get_delim(delim[idelim],height,family);
if ( delimsp != NULL ) /* rasterized delim */
{ delimsp->baseline = habove; /* set baseline */
if ( sp == NULL ) /* this is first piece */
sp = delimsp; /* so just use it */
else sp = rastcat(sp,delimsp,3); } } /*or concat to existing pieces*/
} /* --- end-of-for(idelim) --- */
/* --- back to caller --- */
end_of_job:
if ( 0 ) /* now handled above */
for ( idelim=1; idelim<=ndelims; idelim++ ) /* free subsp[]'s (not 0) */
if ( subsp[idelim] != NULL ) /* have allocated subraster */
delete_subraster(subsp[idelim]); /* so free it */
if ( sp != NULL ) /* returning entire expression */
{ int newht = (sp->image)->height; /* height of returned subraster */
sp->baseline = min2(newht-1,newht/2+5); /* guess new baseline */
isreplaceleft = 1; /* set flag to replace left half*/
*expression += strlen(*expression); } /* and push to terminating null*/
return ( sp );
} /* --- end-of-function rastmiddle() --- */
/* ==========================================================================
* Function: rastflags ( expression, size, basesp, flag, value, arg3 )
* Purpose: sets an internal flag, e.g., for \rm, or sets an internal
* value, e.g., for \unitlength=<value>, and returns NULL
* so nothing is displayed
* --------------------------------------------------------------------------
* Arguments: expression (I) char ** to first char of null-terminated
* LaTeX expression (unused/unchanged)
* size (I) int containing base font size (not used,
* just stored in subraster)
* basesp (I) subraster * to character (or subexpression)
* immediately preceding "flags" directive
* (unused but passed for consistency)
* flag (I) int containing #define'd symbol specifying
* internal flag to be set
* value (I) int containing new value of flag
* arg3 (I) int unused
* --------------------------------------------------------------------------
* Returns: ( subraster * ) NULL so nothing is displayed
* --------------------------------------------------------------------------
* Notes: o
* ======================================================================= */
/* --- entry point --- */
subraster *rastflags ( char **expression, int size, subraster *basesp,
int flag, int value, int arg3 )
{
/* -------------------------------------------------------------------------
Allocations and Declarations
-------------------------------------------------------------------------- */
char *texsubexpr(), /* parse expression for... */
valuearg[1024]="NOVALUE"; /* value from expression, if needed */
int argvalue=NOVALUE, /* atoi(valuearg) */
isdelta=0, /* true if + or - precedes valuearg */
valuelen=0; /* strlen(valuearg) */
double strtod(); /*convert ascii {valuearg} to double*/
static int displaystylelevel = (-99); /* \displaystyle set at recurlevel */
/* -------------------------------------------------------------------------
set flag or value
-------------------------------------------------------------------------- */
switch ( flag )
{
default: break; /* unrecognized flag */
case ISFONTFAM:
if ( isthischar((*(*expression)),WHITEMATH) ) /* \rm followed by white */
(*expression)++; /* skip leading ~ after \rm */
fontnum = value; /* set font family */
break;
case ISSTRING: isstring=value; break; /* set string/image mode */
case ISDISPLAYSTYLE: /* set \displaystyle mode */
displaystylelevel = recurlevel; /* \displaystyle set at recurlevel */
isdisplaystyle=value; break;
case ISOPAQUE: istransparent=value; break; /* set transparent/opaque */
case ISREVERSE: /* reverse video */
if ( value==1 || value==NOVALUE )
{ fgred=255-fgred; fggreen=255-fggreen; fgblue=255-fgblue; }
if ( value==2 || value==NOVALUE )
{ bgred=255-bgred; bggreen=255-bggreen; bgblue=255-bgblue; }
if ( value==2 || value==NOVALUE )
isblackonwhite = !isblackonwhite;
break;
case ISSUPER: /* set supersampling/lowpass flag */
#ifndef SSFONTS /* don't have ss fonts loaded */
value = 0; /* so force lowpass */
#endif
isss = issupersampling = value;
fonttable = (issupersampling?ssfonttable:aafonttable); /* set fonts */
break;
case ISFONTSIZE: /* set fontsize */
case ISDISPLAYSIZE: /* set displaysize */
case ISSHRINK: /* set shrinkfactor */
case ISAAALGORITHM: /* set anti-aliasing algorithm */
case ISWEIGHT: /* set font weight */
case ISCENTERWT: /* set lowpass center pixel weight */
case ISADJACENTWT: /* set lowpass adjacent weight */
case ISCORNERWT: /* set lowpass corner weight */
case ISCOLOR: /* set red(1),green(2),blue(3) */
case ISSMASH: /* set (minimum) "smash" margin */
if ( value != NOVALUE ) /* passed a fixed value to be set */
argvalue = value; /* set given fixed value */
else /* get value from expression */
{ *expression = texsubexpr(*expression,valuearg,1023,"{","}",0,0);
if ( *valuearg != '\000' ) /* guard against empty string */
if ( !isalpha(*valuearg) ) /* and against alpha string args */
if ( !isthischar(*valuearg,"?") ) /*leading ? is query for value*/
{ isdelta = isthischar(*valuearg,"+-"); /* leading + or - */
if ( memcmp(valuearg,"--",2) == 0 ) /* leading -- signals...*/
{ isdelta=0; strcpy(valuearg,valuearg+1); } /* ...not delta */
argvalue = atoi(valuearg); } } /* convert to int */
switch ( flag )
{
default: break;
case ISCOLOR: /* set color */
slower(valuearg); /* convert arg to lower case */
if ( argvalue==1 || strstr(valuearg,"red") )
{ fggreen = fgblue = (isblackonwhite?0:255);
fgred = (isblackonwhite?255:0); }
if ( argvalue==2 || strstr(valuearg,"green") )
{ fgred = fgblue = (isblackonwhite?0:255);
fggreen = (isblackonwhite?255:0); }
if ( argvalue==3 || strstr(valuearg,"blue") )
{ fgred = fggreen = (isblackonwhite?0:255);
fgblue = (isblackonwhite?255:0); }
if ( argvalue==0 || strstr(valuearg,"black") )
fgred = fggreen = fgblue = (isblackonwhite?0:255);
if ( argvalue==7 || strstr(valuearg,"white") )
fgred = fggreen = fgblue = (isblackonwhite?255:0);
break;
case ISFONTSIZE: /* set fontsize */
if ( argvalue != NOVALUE ) /* got a value */
{ int largestsize = (issupersampling?16:LARGESTSIZE);
fontsize = (isdelta? fontsize+argvalue : argvalue);
fontsize = max2(0,min2(fontsize,largestsize));
shrinkfactor = shrinkfactors[fontsize];
if ( isdisplaystyle == 1 /* displaystyle enabled but not set*/
|| (1 && isdisplaystyle==2) /* displaystyle enabled and set */
|| (0 && isdisplaystyle==0) )/*\textstyle disabled displaystyle*/
if ( displaystylelevel != recurlevel ) /*respect \displaystyle*/
if ( !ispreambledollars ) /* respect $$...$$'s */
if ( fontsize >= displaysize )
isdisplaystyle = 2; /* forced */
else isdisplaystyle = 1;
/*displaystylelevel = (-99);*/ } /* reset \displaystyle level */
else /* embed font size in expression */
{ sprintf(valuearg,"%d",fontsize); /* convert size */
valuelen = strlen(valuearg); /* ought to be 1 */
if ( *expression != '\000' ) /* ill-formed expression */
{ *expression = (char *)(*expression-valuelen); /*back up buff*/
memcpy(*expression,valuearg,valuelen); } } /*and put in size*/
break;
case ISDISPLAYSIZE: /* set displaysize */
if ( argvalue != NOVALUE ) /* got a value */
displaysize = (isdelta? displaysize+argvalue : argvalue);
break;
case ISSMASH: /* set (minimum) "smash" margin */
if ( argvalue != NOVALUE ) /* got a value */
{ smashmargin = argvalue; /* set value */
if ( arg3 != NOVALUE ) isdelta=arg3; /* hard-coded isdelta */
issmashdelta = (isdelta?1:0); } /* and set delta flag */
smashmargin = max2((isdelta?-5:0),min2(smashmargin,32)); /*sanity*/
break;
case ISSHRINK: /* set shrinkfactor */
if ( argvalue != NOVALUE ) /* got a value */
shrinkfactor = (isdelta? shrinkfactor+argvalue : argvalue);
shrinkfactor = max2(1,min2(shrinkfactor,27)); /* sanity check */
break;
case ISAAALGORITHM: /* set anti-aliasing algorithm */
if ( argvalue != NOVALUE ) /* got a value */
aaalgorithm = argvalue; /* set algorithm number */
aaalgorithm = max2(0,min2(aaalgorithm,3)); /* bounds check */
break;
case ISWEIGHT: /* set font weight number */
value = (argvalue==NOVALUE? NOVALUE : /* don't have a value */
(isdelta? weightnum+argvalue : argvalue));
if ( value>=0 && value<maxaaparams ) /* in range */
{ weightnum = value; /* reset weightnum index */
minadjacent = aaparams[weightnum].minadjacent;
maxadjacent = aaparams[weightnum].maxadjacent;
cornerwt = aaparams[weightnum].cornerwt;
adjacentwt = aaparams[weightnum].adjacentwt;
centerwt = aaparams[weightnum].centerwt;
fgalias = aaparams[weightnum].fgalias;
fgonly = aaparams[weightnum].fgonly;
bgalias = aaparams[weightnum].bgalias;
bgonly = aaparams[weightnum].bgonly; }
break;
case ISCENTERWT: /* set lowpass center pixel weight */
if ( argvalue != NOVALUE ) /* got a value */
centerwt = argvalue; /* set lowpass center weight */
break;
case ISADJACENTWT: /* set lowpass adjacent weight */
if ( argvalue != NOVALUE ) /* got a value */
adjacentwt = argvalue; /* set lowpass adjacent weight */
break;
case ISCORNERWT: /* set lowpass corner weight */
if ( argvalue != NOVALUE ) /* got a value */
cornerwt = argvalue; /* set lowpass corner weight */
break;
} /* --- end-of-switch() --- */
break;
case PNMPARAMS: /*set fgalias,fgonly,bgalias,bgonly*/
*expression = texsubexpr(*expression,valuearg,1023,"{","}",0,0);
valuelen = strlen(valuearg); /* ought to be 1-4 */
if ( valuelen>0 && isthischar(toupper(valuearg[0]),"TY1") ) fgalias=1;
if ( valuelen>0 && isthischar(toupper(valuearg[0]),"FN0") ) fgalias=0;
if ( valuelen>1 && isthischar(toupper(valuearg[1]),"TY1") ) fgonly =1;
if ( valuelen>1 && isthischar(toupper(valuearg[1]),"FN0") ) fgonly =0;
if ( valuelen>2 && isthischar(toupper(valuearg[2]),"TY1") ) bgalias=1;
if ( valuelen>2 && isthischar(toupper(valuearg[2]),"FN0") ) bgalias=0;
if ( valuelen>3 && isthischar(toupper(valuearg[3]),"TY1") ) bgonly =1;
if ( valuelen>3 && isthischar(toupper(valuearg[3]),"FN0") ) bgonly =0;
break;
case UNITLENGTH:
if ( value != NOVALUE ) /* passed a fixed value to be set */
unitlength = (double)(value); /* set given fixed value */
else /* get value from expression */
{ *expression = texsubexpr(*expression,valuearg,1023,"{","}",0,0);
if ( *valuearg != '\000' ) /* guard against empty string */
unitlength = strtod(valuearg,NULL); } /* convert to double */
break;
} /* --- end-of-switch(flag) --- */
return ( NULL ); /*just set value, nothing to display*/
} /* --- end-of-function rastflags() --- */
/* ==========================================================================
* Function: rastspace(expression, size, basesp, width, isfill, isheight)
* Purpose: returns a blank/space subraster width wide,
* with baseline and height corresponding to basep
* --------------------------------------------------------------------------
* Arguments: expression (I) char ** to first char of null-terminated
* LaTeX expression (unused/unchanged)
* size (I) int containing base font size (not used,
* just stored in subraster)
* basesp (I) subraster * to character (or subexpression)
* immediately preceding space, whose baseline
* and height params are transferred to space
* width (I) int containing #bits/pixels for space width
* isfill (I) int containing true to \hfill complete
* expression out to width
* isheight (I) int containing true (but not NOVALUE)
* to treat width arg as height
* --------------------------------------------------------------------------
* Returns: ( subraster * ) ptr to empty/blank subraster
* or NULL for any error
* --------------------------------------------------------------------------
* Notes: o
* ======================================================================= */
/* --- entry point --- */
subraster *rastspace ( char **expression, int size, subraster *basesp,
int width, int isfill, int isheight )
{
/* -------------------------------------------------------------------------
Allocations and Declarations
-------------------------------------------------------------------------- */
subraster *new_subraster(), *spacesp=NULL; /* subraster for space */
int baseht=1, baseln=0; /* height,baseline of base symbol */
int pixsz = 1; /*default #bits per pixel, 1=bitmap*/
char *texsubexpr(), widtharg[256]; /* parse for optional {width} */
subraster *rasterize(), *rightsp=NULL; /*rasterize right half of expression*/
subraster *rastcat(); /* cat rightsp after \hfill */
/* -------------------------------------------------------------------------
initialization
-------------------------------------------------------------------------- */
if ( isfill == NOVALUE ) isfill=0; /* novalue means false */
if ( isheight == NOVALUE ) isheight=0; /* novalue means false */
/* -------------------------------------------------------------------------
determine width if not given (e.g., \hspace{width}, \hfill{width})
-------------------------------------------------------------------------- */
if ( width <= 0 ) /* width specified in expression */
{ int widthval; /* test {width} before using it */
width = 1; /* set default width */
*expression = texsubexpr(*expression,widtharg,255,"{","}",0,0);
widthval = /* convert {width} to integer */
(int)((unitlength*strtod(widtharg,NULL))+0.5);
if ( widthval>=2 && widthval<=600 ) /* sanity check */
width = widthval; } /* replace deafault width */
/* -------------------------------------------------------------------------
see if width is "absolute" or fill width
-------------------------------------------------------------------------- */
if ( isfill /* called as \hfill{} */
&& !isheight ) /* parameter conflict */
{ if ( leftexpression != NULL ) /* if we have left half */
width -= (leftexpression->image)->width; /*reduce left width from total*/
if ( (rightsp=rasterize(*expression,size)) /* rasterize right half */
!= NULL ) /* succeeded */
width -= (rightsp->image)->width; } /* reduce right width from total */
/* -------------------------------------------------------------------------
construct blank subraster, and return it to caller
-------------------------------------------------------------------------- */
/* --- get parameters from base symbol --- */
if ( basesp != (subraster *)NULL ) /* we have base symbol for space */
{ baseht = (basesp->image)->height; /* height of base symbol */
baseln = basesp->baseline; } /* and its baseline */
/* --- flip params for height --- */
if ( isheight ) /* width is actually height */
{ baseht = width; /* use given width as height */
width = 1; } /* and set default width */
/* --- generate and init space subraster --- */
if ( width > 0 ) /*make sure we have positive width*/
if ( (spacesp=new_subraster(width,baseht,pixsz)) /*generate space subraster*/
!= NULL ) /* and if we succeed... */
{ /* --- ...re-init subraster parameters --- */
spacesp->size = size; /*propagate base font size forward*/
spacesp->baseline = baseln; } /* ditto baseline */
/* -------------------------------------------------------------------------
concat right half if \hfill-ing
-------------------------------------------------------------------------- */
if ( rightsp != NULL ) /* we have a right half after fill */
{ spacesp = (spacesp==NULL? rightsp: /* no space, so just use right half*/
rastcat(spacesp,rightsp,3)); /* or cat right half after space */
spacesp->type = blanksignal; /* need to propagate blanks */
*expression += strlen((*expression)); } /* push expression to its null */
return ( spacesp );
} /* --- end-of-function rastspace() --- */
/* ==========================================================================
* Function: rastnewline ( expression, size, basesp, arg1, arg2, arg3 )
* Purpose: \\ handler, returns subraster corresponding to
* left-hand expression preceding \\ above right-hand expression
* --------------------------------------------------------------------------
* Arguments: expression (I/O) char ** to first char of null-terminated
* string immediately following \\ to be
* rasterized, and returning ptr immediately
* to terminating null.
* size (I) int containing 0-5 default font size
* basesp (I) subraster * to character (or subexpression)
* immediately preceding \\
* (unused, but passed for consistency)
* arg1 (I) int unused
* arg2 (I) int unused
* arg3 (I) int unused
* --------------------------------------------------------------------------
* Returns: ( subraster * ) ptr to subraster corresponding to expression,
* or NULL for any parsing error
* (expression ptr unchanged if error occurs)
* --------------------------------------------------------------------------
* Notes: o
* ======================================================================= */
/* --- entry point --- */
subraster *rastnewline ( char **expression, int size, subraster *basesp,
int arg1, int arg2, int arg3 )
{
/* -------------------------------------------------------------------------
Allocations and Declarations
-------------------------------------------------------------------------- */
subraster *rastack(), *newlsp=NULL; /* subraster for both lines */
subraster *rasterize(), *rightsp=NULL; /*rasterize right half of expression*/
char *texsubexpr(), spacexpr[129]/*, *xptr=spacexpr*/; /*for \\[vspace]*/
double strtod(); /* convert ascii param to double */
int vspace = size+2; /* #pixels between lines */
/* -------------------------------------------------------------------------
obtain optional [vspace] argument immediately following \\ command
-------------------------------------------------------------------------- */
/* --- check if [vspace] given --- */
if ( *(*expression) == '[' ) /*have [vspace] if leading char is [*/
{
/* ---parse [vspace] and bump expression past it, interpret as double--- */
*expression = texsubexpr(*expression,spacexpr,127,"[","]",0,0);
if ( *spacexpr == '\000' ) goto end_of_job; /* couldn't get [vspace] */
vspace = iround(unitlength*strtod(spacexpr,NULL)); /* vspace in pixels */
} /* --- end-of-if(*(*expression)=='[') --- */
if ( leftexpression == NULL ) goto end_of_job; /* nothing preceding \\ */
/* -------------------------------------------------------------------------
rasterize right half of expression and stack left half above it
-------------------------------------------------------------------------- */
/* --- rasterize right half --- */
if ( (rightsp=rasterize(*expression,size)) /* rasterize right half */
== NULL ) goto end_of_job; /* quit if failed */
/* --- stack left half above it --- */
/*newlsp = rastack(rightsp,leftexpression,1,vspace,0,3);*//*right under left*/
newlsp = rastack(rightsp,leftexpression,1,vspace,0,1); /*right under left*/
/* --- back to caller --- */
end_of_job:
if ( newlsp != NULL ) /* returning entire expression */
{ int newht = (newlsp->image)->height; /* height of returned subraster */
newlsp->baseline = min2(newht-1,newht/2+5); /* guess new baseline */
isreplaceleft = 1; /* so set flag to replace left half*/
*expression += strlen(*expression); } /* and push to terminating null*/
return ( newlsp ); /* 1st line over 2nd, or null=error*/
} /* --- end-of-function rastnewline() --- */
/* ==========================================================================
* Function: rastarrow ( expression, size, basesp, drctn, isBig, arg3 )
* Purpose: returns left/right arrow subraster (e.g., for \longrightarrow)
* --------------------------------------------------------------------------
* Arguments: expression (I) char ** to first char of null-terminated
* LaTeX expression (unused/unchanged)
* size (I) int containing base font size (not used,
* just stored in subraster)
* basesp (I) subraster * to character (or subexpression)
* immediately preceding space, whose baseline
* and height params are transferred to space
* drctn (I) int containing +1 for right, -1 for left,
* or 0 for leftright
* isBig (I) int containing 0 for ---> or 1 for ===>
* arg3 (I) int unused
* --------------------------------------------------------------------------
* Returns: ( subraster * ) ptr to left/right arrow subraster
* or NULL for any error
* --------------------------------------------------------------------------
* Notes: o An optional argument [width] may *immediately* follow
* the \longxxx to explicitly set the arrow's width in pixels.
* For example, \longrightarrow calculates a default width
* (as usual in LaTeX), whereas \longrightarrow[50] explicitly
* draws a 50-pixel long arrow. This can be used, e.g.,
* to draw commutative diagrams in conjunction with
* \array (and maybe with \stackrel and/or \relstack, too).
* o In case you really want to render, say, [f]---->[g], just
* use an intervening space, i.e., [f]\longrightarrow~[g].
* In text mode use two spaces {\rm~[f]\longrightarrow~~[g]}.
* ======================================================================= */
/* --- entry point --- */
subraster *rastarrow ( char **expression, int size, subraster *basesp,
int drctn, int isBig, int arg3 )
{
/* -------------------------------------------------------------------------
Allocations and Declarations
-------------------------------------------------------------------------- */
subraster *arrow_subraster(), *arrowsp=NULL; /* subraster for arrow */
char *texsubexpr(), widtharg[256]; /* parse for optional [width] */
char *texscripts(), sub[1024],super[1024]; /* and _^limits after [width]*/
subraster *rasterize(), *subsp=NULL,*supsp=NULL; /*rasterize limits*/
subraster *new_subraster(), *rastack(), *spacesp=NULL; /*space below arrow*/
int delete_subraster(); /*free work areas in case of error*/
double strtod(); /* convert ascii [width] to value */
int width = 10 + 8*size, height; /* width, height for \longxxxarrow */
int islimits = 1; /*true to handle limits internally*/
int limsize = size-1; /* font size for limits */
int vspace = 1; /* #empty rows below arrow */
int pixsz = 1; /*default #bits per pixel, 1=bitmap*/
/* -------------------------------------------------------------------------
construct longleft/rightarrow subraster, with limits, and return it to caller
-------------------------------------------------------------------------- */
/* --- check for optional width arg and replace default width --- */
if ( *(*expression) == '[' ) /*check for []-enclosed optional arg*/
{ int widthval; /* test [width] before using it */
*expression = texsubexpr(*expression,widtharg,255,"[","]",0,0);
widthval = /* convert [width] to integer */
(int)((unitlength*strtod(widtharg,NULL))+0.5);
if ( widthval>=2 && widthval<=600 ) /* sanity check */
width = widthval; } /* replace deafault width */
/* --- now parse for limits, and bump expression past it(them) --- */
if ( islimits ) /* handling limits internally */
{ *expression = texscripts(*expression,sub,super,3); /* parse for limits */
if ( *sub != '\000' ) /*have a subscript following arrow*/
subsp = rasterize(sub,limsize); /* so try to rasterize subscript */
if ( *super != '\000' ) /*have superscript following arrow*/
supsp = rasterize(super,limsize); } /*so try to rasterize superscript*/
/* --- set height based on width --- */
height = min2(17,max2(9,(width+2)/6)); /* height based on width */
height = 1 + (height/2)*2; /* always force odd height */
/* --- generate arrow subraster --- */
if ( (arrowsp=arrow_subraster(width,height,pixsz,drctn,isBig)) /*build arrow*/
== NULL ) goto end_of_job; /* and quit if we failed */
/* --- add space below arrow --- */
if ( vspace > 0 ) /* if we have space below arrow */
if ( (spacesp=new_subraster(width,vspace,pixsz)) /*allocate required space*/
!= NULL ) /* and if we succeeded */
if ( (arrowsp = rastack(spacesp,arrowsp,2,0,1,3)) /* space below arrow */
== NULL ) goto end_of_job; /* and quit if we failed */
/* --- init arrow subraster parameters --- */
arrowsp->size = size; /*propagate base font size forward*/
arrowsp->baseline = height+vspace-1; /* set baseline at bottom of arrow */
/* --- add limits above/below arrow, as necessary --- */
if ( subsp != NULL ) /* stack subscript below arrow */
if ( (arrowsp = rastack(subsp,arrowsp,2,0,1,3)) /* subscript below arrow */
== NULL ) goto end_of_job; /* quit if failed */
if ( supsp != NULL ) /* stack superscript above arrow */
if ( (arrowsp = rastack(arrowsp,supsp,1,vspace,1,3)) /*supsc above arrow*/
== NULL ) goto end_of_job; /* quit if failed */
/* --- return arrow (or NULL) to caller --- */
end_of_job:
return ( arrowsp );
} /* --- end-of-function rastarrow() --- */
/* ==========================================================================
* Function: rastuparrow ( expression, size, basesp, drctn, isBig, arg3 )
* Purpose: returns an up/down arrow subraster (e.g., for \longuparrow)
* --------------------------------------------------------------------------
* Arguments: expression (I) char ** to first char of null-terminated
* LaTeX expression (unused/unchanged)
* size (I) int containing base font size (not used,
* just stored in subraster)
* basesp (I) subraster * to character (or subexpression)
* immediately preceding space, whose baseline
* and height params are transferred to space
* drctn (I) int containing +1 for up, -1 for down,
* or 0 for updown
* isBig (I) int containing 0 for ---> or 1 for ===>
* arg3 (I) int unused
* --------------------------------------------------------------------------
* Returns: ( subraster * ) ptr to up/down arrow subraster
* or NULL for any error
* --------------------------------------------------------------------------
* Notes: o An optional argument [height] may *immediately* follow
* the \longxxx to explicitly set the arrow's height in pixels.
* For example, \longuparrow calculates a default height
* (as usual in LaTeX), whereas \longuparrow[25] explicitly
* draws a 25-pixel high arrow. This can be used, e.g.,
* to draw commutative diagrams in conjunction with
* \array (and maybe with \stackrel and/or \relstack, too).
* o In case you really want to render, say, [f]---->[g], just
* use an intervening space, i.e., [f]\longuparrow~[g].
* In text use two spaces {\rm~[f]\longuparrow~~[g]}.
* ======================================================================= */
/* --- entry point --- */
subraster *rastuparrow ( char **expression, int size, subraster *basesp,
int drctn, int isBig, int arg3 )
{
/* -------------------------------------------------------------------------
Allocations and Declarations
-------------------------------------------------------------------------- */
subraster *uparrow_subraster(), *arrowsp=NULL; /* subraster for arrow */
char *texsubexpr(), heightarg[256]; /* parse for optional [height] */
char *texscripts(), sub[1024],super[1024]; /* and _^limits after [width]*/
subraster *rasterize(), *subsp=NULL,*supsp=NULL; /*rasterize limits*/
subraster *rastcat(); /* cat superscript left, sub right */
double strtod(); /* convert ascii [height] to value */
int height = 8 + 2*size, width; /* height, width for \longxxxarrow */
int islimits = 1; /*true to handle limits internally*/
int limsize = size-1; /* font size for limits */
int pixsz = 1; /*default #bits per pixel, 1=bitmap*/
/* -------------------------------------------------------------------------
construct blank subraster, and return it to caller
-------------------------------------------------------------------------- */
/* --- check for optional height arg and replace default height --- */
if ( *(*expression) == '[' ) /*check for []-enclosed optional arg*/
{ int heightval; /* test height before using it */
*expression = texsubexpr(*expression,heightarg,255,"[","]",0,0);
heightval = /* convert [height] to integer */
(int)((unitlength*strtod(heightarg,NULL))+0.5);
if ( heightval>=2 && heightval<=600 ) /* sanity check */
height = heightval; } /* replace deafault height */
/* --- now parse for limits, and bump expression past it(them) --- */
if ( islimits ) /* handling limits internally */
{ *expression = texscripts(*expression,sub,super,3); /* parse for limits */
if ( *sub != '\000' ) /*have a subscript following arrow*/
subsp = rasterize(sub,limsize); /* so try to rasterize subscript */
if ( *super != '\000' ) /*have superscript following arrow*/
supsp = rasterize(super,limsize); } /*so try to rasterize superscript*/
/* --- set width based on height --- */
width = min2(17,max2(9,(height+2)/4)); /* width based on height */
width = 1 + (width/2)*2; /* always force odd width */
/* --- generate arrow subraster --- */
if ( (arrowsp=uparrow_subraster(width,height,pixsz,drctn,isBig)) /*build arr*/
== NULL ) goto end_of_job; /* and quit if we failed */
/* --- init arrow subraster parameters --- */
arrowsp->size = size; /*propagate base font size forward*/
arrowsp->baseline = height-1; /* set baseline at bottom of arrow */
/* --- add limits above/below arrow, as necessary --- */
if ( supsp != NULL ) /* cat superscript to left of arrow*/
{ int supht = (supsp->image)->height, /* superscript height */
deltab = (1+abs(height-supht))/2; /* baseline difference to center */
supsp->baseline = supht-1; /* force script baseline to bottom */
if ( supht <= height ) /* arrow usually taller than script*/
arrowsp->baseline -= deltab; /* so bottom of script goes here */
else supsp->baseline -= deltab; /* else bottom of arrow goes here */
if ( (arrowsp = rastcat(supsp,arrowsp,3)) /* superscript left of arrow */
== NULL ) goto end_of_job; } /* quit if failed */
if ( subsp != NULL ) /* cat subscript to right of arrow */
{ int subht = (subsp->image)->height, /* subscript height */
deltab = (1+abs(height-subht))/2; /* baseline difference to center */
arrowsp->baseline = height-1; /* reset arrow baseline to bottom */
subsp->baseline = subht-1; /* force script baseline to bottom */
if ( subht <= height ) /* arrow usually taller than script*/
arrowsp->baseline -= deltab; /* so bottom of script goes here */
else subsp->baseline -= deltab; /* else bottom of arrow goes here */
if ( (arrowsp = rastcat(arrowsp,subsp,3)) /* subscript right of arrow */
== NULL ) goto end_of_job; } /* quit if failed */
/* --- return arrow (or NULL) to caller --- */
end_of_job:
arrowsp->baseline = height-1; /* reset arrow baseline to bottom */
return ( arrowsp );
} /* --- end-of-function rastuparrow() --- */
/* ==========================================================================
* Function: rastoverlay (expression, size, basesp, overlay, offset2, arg3)
* Purpose: overlays one raster on another
* --------------------------------------------------------------------------
* Arguments: expression (I/O) char ** to first char of null-terminated
* string immediately following overlay \cmd to
* be rasterized, and returning ptr immediately
* following last character processed.
* size (I) int containing 0-5 default font size
* basesp (I) subraster * to character (or subexpression)
* immediately preceding overlay \cmd
* (unused, but passed for consistency)
* overlay (I) int containing 1 to overlay / (e.g., \not)
* or NOVALUE to pick up 2nd arg from expression
* offset2 (I) int containing #pixels to horizontally offset
* overlay relative to underlying symbol,
* positive(right) or negative or 0,
* or NOVALUE to pick up optional [offset] arg
* arg3 (I) int unused
* --------------------------------------------------------------------------
* Returns: ( subraster * ) ptr to subraster corresponding to composite,
* or NULL for any parsing error
* --------------------------------------------------------------------------
* Notes: o
* ======================================================================= */
/* --- entry point --- */
subraster *rastoverlay ( char **expression, int size, subraster *basesp,
int overlay, int offset2, int arg3 )
{
/* -------------------------------------------------------------------------
Allocations and Declarations
-------------------------------------------------------------------------- */
char *texsubexpr(), /*parse expression for base,overlay*/
expr1[512], expr2[512]; /* base, overlay */
subraster *rasterize(), *sp1=NULL, *sp2=NULL, /*rasterize 1=base, 2=overlay*/
*new_subraster(); /*explicitly alloc sp2 if necessary*/
subraster *rastcompose(), *overlaysp=NULL; /*subraster for composite overlay*/
int line_raster(); /* draw diagonal for \Not */
/* -------------------------------------------------------------------------
Obtain base, and maybe overlay, and rasterize them
-------------------------------------------------------------------------- */
/* --- check for optional offset2 arg --- */
if ( offset2 == NOVALUE ) /* only if not explicitly specified*/
if ( *(*expression) == '[' ) /*check for []-enclosed optional arg*/
{ int offsetval; /* test before using it */
*expression = texsubexpr(*expression,expr2,511,"[","]",0,0);
offsetval = (int)(strtod(expr2,NULL)+0.5); /* convert [offset2] to int */
if ( abs(offsetval) <= 25 ) /* sanity check */
offset2 = offsetval; } /* replace deafault */
if ( offset2 == NOVALUE ) offset2 = 0; /* novalue means no offset */
/* --- parse for base, bump expression past it, and rasterize it --- */
*expression = texsubexpr(*expression,expr1,511,"{","}",0,0);
if ( *expr1 == '\000' ) goto end_of_job; /* nothing to overlay, so quit */
if ( (sp1=rasterize(expr1,size)) /* rasterize base expression */
== NULL ) goto end_of_job; /* quit if failed to rasterize */
overlaysp = sp1; /*in case we return with no overlay*/
/* --- get overlay expression, and rasterize it --- */
if ( overlay == NOVALUE ) /* get overlay from input stream */
{ *expression = texsubexpr(*expression,expr2,511,"{","}",0,0);
if ( *expr2 != '\000' ) /* have an overlay */
sp2 = rasterize(expr2,size); } /* so rasterize overlay expression */
else /* specific overlay */
switch ( overlay )
{
default: break;
case 1: /* e.g., \not overlays slash */
sp2 = rasterize("/",size+1); /* rasterize overlay expression */
offset2 = max2(1,size-3); /* push / right a bit */
offset2 = 0;
break;
case 2: /* e.g., \Not draws diagonal */
sp2 = NULL; /* no overlay required */
if ( overlaysp != NULL ) /* check that we have raster */
{ raster *rp = overlaysp->image; /* raster to be \Not-ed */
int width=rp->width, height=rp->height; /* raster dimensions */
if ( 0 ) /* diagonal within bounding box */
line_raster(rp,0,width-1,height-1,0,1); /* just draw diagonal */
else /* construct "wide" diagonal */
{ int margin=3; /* desired extra margin width */
sp2 = new_subraster(width+margin,height+margin,1); /*alloc it*/
if ( sp2 != NULL ) /* allocated successfully */
line_raster(sp2->image,0,width+margin-1,height+margin-1,0,1);}}
break;
case 3: /* e.g., \sout for strikeout */
sp2 = NULL; /* no overlay required */
if ( overlaysp != NULL ) /* check that we have raster */
{ raster *rp = overlaysp->image; /* raster to be \Not-ed */
int width=rp->width, height=rp->height; /* raster dimensions */
int baseline = overlaysp->baseline; /* we'll ignore descenders */
int midrow = max2(0,min2(height-1,offset2+((baseline+1)/2)));
if ( 1 ) /* strikeout within bounding box */
line_raster(rp,midrow,0,midrow,width-1,1); } /*draw strikeout*/
break;
} /* --- end-of-switch(overlay) --- */
if ( sp2 == NULL ) goto end_of_job; /*return sp1 if failed to rasterize*/
/* -------------------------------------------------------------------------
construct composite overlay
-------------------------------------------------------------------------- */
overlaysp = rastcompose(sp1,sp2,offset2,0,3);
end_of_job:
return ( overlaysp );
} /* --- end-of-function rastoverlay() --- */
/* ==========================================================================
* Function: rastfrac ( expression, size, basesp, isfrac, arg2, arg3 )
* Purpose: \frac,\atop handler, returns a subraster corresponding to
* expression (immediately following \frac,\atop) at font size
* --------------------------------------------------------------------------
* Arguments: expression (I/O) char ** to first char of null-terminated
* string immediately following \frac to be
* rasterized, and returning ptr immediately
* following last character processed.
* size (I) int containing 0-5 default font size
* basesp (I) subraster * to character (or subexpression)
* immediately preceding \frac
* (unused, but passed for consistency)
* isfrac (I) int containing true to draw horizontal line
* between numerator and denominator,
* or false not to draw it (for \atop).
* arg2 (I) int unused
* arg3 (I) int unused
* --------------------------------------------------------------------------
* Returns: ( subraster * ) ptr to subraster corresponding to fraction,
* or NULL for any parsing error
* --------------------------------------------------------------------------
* Notes: o
* ======================================================================= */
/* --- entry point --- */
subraster *rastfrac ( char **expression, int size, subraster *basesp,
int isfrac, int arg2, int arg3 )
{
/* -------------------------------------------------------------------------
Allocations and Declarations
-------------------------------------------------------------------------- */
char *texsubexpr(), /*parse expression for numer,denom*/
numer[8192], denom[8192]; /*numer,denom parsed from expression*/
subraster *rasterize(), *numsp=NULL, *densp=NULL; /*rasterize numer, denom*/
subraster *rastack(), *fracsp=NULL; /* subraster for numer/denom */
subraster *new_subraster()/*, *spacesp=NULL*/; /* space for num or den */
int width=0, /* width of constructed raster */
numheight=0; /* height of numerator */
int baseht=0, baseln=0; /* height,baseline of base symbol */
/*int istweak = 1;*/ /*true to tweak baseline alignment*/
int rule_raster(), /* draw horizontal line for frac */
lineheight = 1; /* thickness of fraction line */
int vspace = (size>2?2:1); /*vertical space between components*/
int delete_subraster(); /*free work areas in case of error*/
int type_raster(); /* display debugging output */
/* -------------------------------------------------------------------------
Obtain numerator and denominator, and rasterize them
-------------------------------------------------------------------------- */
/* --- parse for numerator,denominator and bump expression past them --- */
*expression = texsubexpr(*expression,numer,0,"{","}",0,0);
*expression = texsubexpr(*expression,denom,0,"{","}",0,0);
if ( *numer=='\000' && *denom=='\000' ) /* missing both components of frac */
goto end_of_job; /* nothing to do, so quit */
/* --- rasterize numerator, denominator --- */
if ( *numer != '\000' ) /* have a numerator */
if ( (numsp = rasterize(numer,size-1)) /* so rasterize numer at size-1 */
== NULL ) goto end_of_job; /* and quit if failed */
if ( *denom != '\000' ) /* have a denominator */
if ( (densp = rasterize(denom,size-1)) /* so rasterize denom at size-1 */
== NULL ) /* failed */
{ if ( numsp != NULL ) /* already rasterized numerator */
delete_subraster(numsp); /* so free now-unneeded numerator */
goto end_of_job; } /* and quit */
/* --- if one componenet missing, use a blank space for it --- */
if ( numsp == NULL ) /* no numerator given */
numsp = rasterize("[?]",size-1); /* missing numerator */
if ( densp == NULL ) /* no denominator given */
densp = rasterize("[?]",size-1); /* missing denominator */
/* --- check that we got both components --- */
if ( numsp==NULL || densp==NULL ) /* some problem */
{ delete_subraster(numsp); /*delete numerator (if it existed)*/
delete_subraster(densp); /*delete denominator (if it existed)*/
goto end_of_job; } /* and quit */
/* --- get height of numerator (to determine where line belongs) --- */
numheight = (numsp->image)->height; /* get numerator's height */
/* -------------------------------------------------------------------------
construct raster with numerator stacked over denominator
-------------------------------------------------------------------------- */
/* --- construct raster with numer/denom --- */
if ( (fracsp = rastack(densp,numsp,0,2*vspace+lineheight,1,3))/*numer/denom*/
== NULL ) /* failed to construct numer/denom */
{ delete_subraster(numsp); /* so free now-unneeded numerator */
delete_subraster(densp); /* and now-unneeded denominator */
goto end_of_job; } /* and then quit */
/* --- determine width of constructed raster --- */
width = (fracsp->image)->width; /*just get width of embedded image*/
/* --- initialize subraster parameters --- */
fracsp->size = size; /* propagate font size forward */
fracsp->baseline = (numheight+vspace+lineheight)+(size+2);/*default baseline*/
if ( basesp != (subraster *)NULL ) /* we have base symbol for frac */
{ baseht = (basesp->image)->height; /* height of base symbol */
baseln = basesp->baseline; /* and its baseline */
} /* --- end-of-if(basesp!=NULL) --- */
/* -------------------------------------------------------------------------
draw horizontal line between numerator and denominator
-------------------------------------------------------------------------- */
if ( isfrac ) /*line for \frac, but not for \atop*/
rule_raster(fracsp->image,numheight+vspace,0,width,lineheight,0);
/* -------------------------------------------------------------------------
return final result to caller
-------------------------------------------------------------------------- */
end_of_job:
if ( msgfp!=NULL && msglevel>=99 )
{ fprintf(msgfp,"rastfrac> returning %s\n",(fracsp==NULL?"null":"..."));
if ( fracsp != NULL ) /* have a constructed raster */
type_raster(fracsp->image,msgfp); } /* display constructed raster */
return ( fracsp );
} /* --- end-of-function rastfrac() --- */
/* ==========================================================================
* Function: rastackrel ( expression, size, basesp, base, arg2, arg3 )
* Purpose: \stackrel handler, returns a subraster corresponding to
* stacked relation
* --------------------------------------------------------------------------
* Arguments: expression (I/O) char ** to first char of null-terminated
* string immediately following \stackrel to be
* rasterized, and returning ptr immediately
* following last character processed.
* size (I) int containing 0-4 default font size
* basesp (I) subraster * to character (or subexpression)
* immediately preceding \stackrel
* (unused, but passed for consistency)
* base (I) int containing 1 if upper/first subexpression
* is base relation, or 2 if lower/second is
* arg2 (I) int unused
* arg3 (I) int unused
* --------------------------------------------------------------------------
* Returns: ( subraster * ) ptr to subraster corresponding to stacked
* relation, or NULL for any parsing error
* --------------------------------------------------------------------------
* Notes: o
* ======================================================================= */
/* --- entry point --- */
subraster *rastackrel ( char **expression, int size, subraster *basesp,
int base, int arg2, int arg3 )
{
/* -------------------------------------------------------------------------
Allocations and Declarations
-------------------------------------------------------------------------- */
char *texsubexpr(), /*parse expression for numer,denom*/
upper[8192], lower[8192]; /*upper,lower parsed from expression*/
subraster *rasterize(), *upsp=NULL, *lowsp=NULL; /* rasterize upper, lower */
subraster *rastack(), *relsp=NULL; /* subraster for upper/lower */
int upsize = (base==1? size:size-1), /* font size for upper component */
lowsize = (base==2? size:size-1); /* font size for lower component */
int vspace = 1; /*vertical space between components*/
int delete_subraster(); /*free work areas in case of error*/
/* -------------------------------------------------------------------------
Obtain numerator and denominator, and rasterize them
-------------------------------------------------------------------------- */
/* --- parse for numerator,denominator and bump expression past them --- */
*expression = texsubexpr(*expression,upper,0,"{","}",0,0);
*expression = texsubexpr(*expression,lower,0,"{","}",0,0);
if ( *upper=='\000' || *lower=='\000' ) /* missing either component */
goto end_of_job; /* nothing to do, so quit */
/* --- rasterize upper, lower --- */
if ( *upper != '\000' ) /* have upper component */
if ( (upsp = rasterize(upper,upsize)) /* so rasterize upper component */
== NULL ) goto end_of_job; /* and quit if failed */
if ( *lower != '\000' ) /* have lower component */
if ( (lowsp = rasterize(lower,lowsize)) /* so rasterize lower component */
== NULL ) /* failed */
{ if ( upsp != NULL ) /* already rasterized upper */
delete_subraster(upsp); /* so free now-unneeded upper */
goto end_of_job; } /* and quit */
/* -------------------------------------------------------------------------
construct stacked relation raster
-------------------------------------------------------------------------- */
/* --- construct stacked relation --- */
if ( (relsp = rastack(lowsp,upsp,3-base,vspace,1,3)) /* stacked relation */
== NULL ) goto end_of_job; /* quit if failed */
/* --- initialize subraster parameters --- */
relsp->size = size; /* propagate font size forward */
/* -------------------------------------------------------------------------
return final result to caller
-------------------------------------------------------------------------- */
end_of_job:
return ( relsp );
} /* --- end-of-function rastackrel() --- */
/* ==========================================================================
* Function: rastmathfunc ( expression, size, basesp, base, arg2, arg3 )
* Purpose: \log, \lim, etc handler, returns a subraster corresponding
* to math functions
* --------------------------------------------------------------------------
* Arguments: expression (I/O) char ** to first char of null-terminated
* string immediately following \mathfunc to be
* rasterized, and returning ptr immediately
* following last character processed.
* size (I) int containing 0-4 default font size
* basesp (I) subraster * to character (or subexpression)
* immediately preceding \mathfunc
* (unused, but passed for consistency)
* mathfunc (I) int containing 1=arccos, 2=arcsin, etc.
* islimits (I) int containing 1 if function may have
* limits underneath, e.g., \lim_{n\to\infty}
* arg3 (I) int unused
* --------------------------------------------------------------------------
* Returns: ( subraster * ) ptr to subraster corresponding to mathfunc,
* or NULL for any parsing error
* --------------------------------------------------------------------------
* Notes: o
* ======================================================================= */
/* --- entry point --- */
subraster *rastmathfunc ( char **expression, int size, subraster *basesp,
int mathfunc, int islimits, int arg3 )
{
/* -------------------------------------------------------------------------
Allocations and Declarations
-------------------------------------------------------------------------- */
char *texscripts(), /* parse expression for _limits */
func[4096], limits[8192]; /* func as {\rm func}, limits */
char *texsubexpr(), /* parse expression for arg */
funcarg[2048]; /* optional func arg */
subraster *rasterize(), *funcsp=NULL, *limsp=NULL; /*rasterize func,limits*/
subraster *rastack(), *mathfuncsp=NULL; /* subraster for mathfunc/limits */
int limsize = size-1; /* font size for limits */
int vspace = 1; /*vertical space between components*/
int delete_subraster(); /*free work areas in case of error*/
/* --- table of function names by mathfunc number --- */
static int numnames = 34; /* number of names in table */
static char *funcnames[] = {
"error", /* 0 index is illegal/error bucket*/
"arccos", "arcsin", "arctan", /* 1 - 3 */
"arg", "cos", "cosh", /* 4 - 6 */
"cot", "coth", "csc", /* 7 - 9 */
"deg", "det", "dim", /* 10 - 12 */
"exp", "gcd", "hom", /* 13 - 15 */
"inf", "ker", "lg", /* 16 - 18 */
"lim", "liminf", "limsup", /* 19 - 21 */
"ln", "log", "max", /* 22 - 24 */
"min", "Pr", "sec", /* 25 - 27 */
"sin", "sinh", "sup", /* 28 - 30 */
"tan", "tanh", /* 31 - 32 */
/* --- extra mimetex funcnames --- */
"tr", /* 33 */
"pmod" /* 34 */
} ;
/* -------------------------------------------------------------------------
set up and rasterize function name in \rm
-------------------------------------------------------------------------- */
if ( mathfunc<0 || mathfunc>numnames ) mathfunc=0; /* check index bounds */
switch ( mathfunc ) /* check for special processing */
{
default: /* no special processing */
strcpy(func,"{\\rm~"); /* init string with {\rm~ */
strcat(func,funcnames[mathfunc]); /* concat function name */
strcat(func,"}"); /* and add terminating } */
break;
case 34: /* \pmod{x} --> (mod x) */
/* --- parse for \pmod{arg} argument --- */
*expression = texsubexpr(*expression,funcarg,2047,"{","}",0,0);
strcpy(func,"{\\({\\rm~mod}"); /* init with {\left({\rm~mod} */
strcat(func,"\\hspace2"); /* concat space */
strcat(func,funcarg); /* and \pmodargument */
strcat(func,"\\)}"); /* and add terminating \right)} */
break;
} /* --- end-of-switch(mathfunc) --- */
if ( (funcsp = rasterize(func,size)) /* rasterize function name */
== NULL ) goto end_of_job; /* and quit if failed */
mathfuncsp = funcsp; /* just return funcsp if no limits */
if ( !islimits ) goto end_of_job; /* treat any subscript normally */
/* -------------------------------------------------------------------------
Obtain limits, if permitted and if provided, and rasterize them
-------------------------------------------------------------------------- */
/* --- parse for subscript limits, and bump expression past it(them) --- */
*expression = texscripts(*expression,limits,limits,1);
if ( *limits=='\000') goto end_of_job; /* no limits, nothing to do, quit */
/* --- rasterize limits --- */
if ( (limsp = rasterize(limits,limsize)) /* rasterize limits */
== NULL ) goto end_of_job; /* and quit if failed */
/* -------------------------------------------------------------------------
construct func atop limits
-------------------------------------------------------------------------- */
/* --- construct func atop limits --- */
if ( (mathfuncsp = rastack(limsp,funcsp,2,vspace,1,3)) /* func atop limits */
== NULL ) goto end_of_job; /* quit if failed */
/* --- initialize subraster parameters --- */
mathfuncsp->size = size; /* propagate font size forward */
/* -------------------------------------------------------------------------
return final result to caller
-------------------------------------------------------------------------- */
end_of_job:
return ( mathfuncsp );
} /* --- end-of-function rastmathfunc() --- */
/* ==========================================================================
* Function: rastsqrt ( expression, size, basesp, arg1, arg2, arg3 )
* Purpose: \sqrt handler, returns a subraster corresponding to
* expression (immediately following \sqrt) at font size
* --------------------------------------------------------------------------
* Arguments: expression (I/O) char ** to first char of null-terminated
* string immediately following \sqrt to be
* rasterized, and returning ptr immediately
* following last character processed.
* size (I) int containing 0-4 default font size
* basesp (I) subraster * to character (or subexpression)
* immediately preceding \accent
* (unused, but passed for consistency)
* arg1 (I) int unused
* arg2 (I) int unused
* arg3 (I) int unused
* --------------------------------------------------------------------------
* Returns: ( subraster * ) ptr to subraster corresponding to expression,
* or NULL for any parsing error
* (expression ptr unchanged if error occurs)
* --------------------------------------------------------------------------
* Notes: o
* ======================================================================= */
/* --- entry point --- */
subraster *rastsqrt ( char **expression, int size, subraster *basesp,
int arg1, int arg2, int arg3 )
{
/* -------------------------------------------------------------------------
Allocations and Declarations
-------------------------------------------------------------------------- */
char *texsubexpr(), subexpr[8192], /* parse subexpr to be sqrt-ed */
rootarg[8192]; /* optional \sqrt[rootarg]{...} */
subraster *rasterize(), *subsp=NULL; /* rasterize subexpr */
subraster *accent_subraster(), *sqrtsp=NULL, /* subraster with the sqrt */
*new_subraster(), *rootsp=NULL; /* optionally preceded by [rootarg]*/
int sqrtheight=0, sqrtwidth=0, surdwidth=0, /* height,width of sqrt */
rootheight=0, rootwidth=0, /* height,width of rootarg raster */
subheight=0, subwidth=0, pixsz=0; /* height,width,pixsz of subexpr */
int rastput(); /* put subexpr in constructed sqrt */
int overspace = 2; /*space between subexpr and overbar*/
int delete_subraster(); /* free work areas */
/* -------------------------------------------------------------------------
Obtain subexpression to be sqrt-ed, and rasterize it
-------------------------------------------------------------------------- */
/* --- first check for optional \sqrt[rootarg]{...} --- */
if ( *(*expression) == '[' ) /*check for []-enclosed optional arg*/
{ *expression = texsubexpr(*expression,rootarg,0,"[","]",0,0);
if ( *rootarg != '\000' ) /* got rootarg */
if ( (rootsp=rasterize(rootarg,size-1)) /*rasterize it at smaller size*/
!= NULL ) /* rasterized successfully */
{ rootheight = (rootsp->image)->height; /* get height of rootarg */
rootwidth = (rootsp->image)->width; } /* and its width */
} /* --- end-of-if(**expression=='[') --- */
/* --- parse for subexpr to be sqrt-ed, and bump expression past it --- */
*expression = texsubexpr(*expression,subexpr,0,"{","}",0,0);
if ( *subexpr == '\000' ) /* couldn't get subexpression */
goto end_of_job; /* nothing to do, so quit */
/* --- rasterize subexpression to be accented --- */
if ( (subsp = rasterize(subexpr,size)) /*rasterize subexpr at original size*/
== NULL ) goto end_of_job; /* quit if failed */
/* -------------------------------------------------------------------------
determine height and width of sqrt raster to be constructed
-------------------------------------------------------------------------- */
/* --- first get height and width of subexpr --- */
subheight = (subsp->image)->height; /* height of subexpr */
subwidth = (subsp->image)->width; /* and its width */
pixsz = (subsp->image)->pixsz; /* pixsz remains constant */
/* --- determine height and width of sqrt to contain subexpr --- */
sqrtheight = subheight + overspace; /* subexpr + blank line + overbar */
surdwidth = SQRTWIDTH(sqrtheight); /* width of surd */
sqrtwidth = subwidth + surdwidth + 1; /* total width */
/* -------------------------------------------------------------------------
construct sqrt (with room to move in subexpr) and embed subexpr in it
-------------------------------------------------------------------------- */
/* --- construct sqrt --- */
if ( (sqrtsp=accent_subraster(SQRTACCENT,sqrtwidth,sqrtheight,pixsz))
== NULL ) goto end_of_job; /* quit if failed to build sqrt */
/* --- embed subexpr in sqrt at lower-right corner--- */
rastput(sqrtsp->image,subsp->image,overspace,sqrtwidth-subwidth,1);
sqrtsp->baseline = subsp->baseline + overspace; /* adjust baseline */
/* --- "embed" rootarg at upper-left --- */
if ( rootsp != NULL ) /*have optional \sqrt[rootarg]{...}*/
{
/* --- allocate full raster to contain sqrtsp and rootsp --- */
int fullwidth = sqrtwidth +rootwidth - min2(rootwidth,max2(0,surdwidth-4)),
fullheight= sqrtheight+rootheight- min2(rootheight,3+size);
subraster *fullsp = new_subraster(fullwidth,fullheight,pixsz);
if ( fullsp != NULL ) /* allocated successfully */
{ /* --- embed sqrtsp exactly at lower-right corner --- */
rastput(fullsp->image,sqrtsp->image, /* exactly at lower-right corner*/
fullheight-sqrtheight,fullwidth-sqrtwidth,1);
/* --- embed rootsp near upper-left, nestled above leading surd --- */
rastput(fullsp->image,rootsp->image,
0,max2(0,surdwidth-rootwidth-2-size),0);
/* --- replace sqrtsp with fullsp --- */
delete_subraster(sqrtsp); /* free original sqrtsp */
sqrtsp = fullsp; /* and repoint it to fullsp instead*/
sqrtsp->baseline = fullheight - (subheight - subsp->baseline); }
} /* --- end-of-if(rootsp!=NULL) --- */
/* --- initialize subraster parameters --- */
sqrtsp->size = size; /* propagate font size forward */
/* -------------------------------------------------------------------------
free unneeded component subrasters and return final result to caller
-------------------------------------------------------------------------- */
end_of_job:
if ( subsp != NULL ) delete_subraster(subsp); /* free unneeded subexpr */
return ( sqrtsp );
} /* --- end-of-function rastsqrt() --- */
/* ==========================================================================
* Function: rastaccent (expression,size,basesp,accent,isabove,isscript)
* Purpose: \hat, \vec, \etc handler, returns a subraster corresponding
* to expression (immediately following \accent) at font size
* --------------------------------------------------------------------------
* Arguments: expression (I/O) char ** to first char of null-terminated
* string immediately following \accent to be
* rasterized, and returning ptr immediately
* following last character processed.
* size (I) int containing 0-4 default font size
* basesp (I) subraster * to character (or subexpression)
* immediately preceding \accent
* (unused, but passed for consistency)
* accent (I) int containing HATACCENT or VECACCENT, etc,
* between numerator and denominator,
* or false not to draw it (for \over).
* isabove (I) int containing true if accent is above
* expression to be accented, or false
* if accent is below (e.g., underbrace)
* isscript (I) int containing true if sub/superscripts
* allowed (for under/overbrace), or 0 if not.
* --------------------------------------------------------------------------
* Returns: ( subraster * ) ptr to subraster corresponding to expression,
* or NULL for any parsing error
* (expression ptr unchanged if error occurs)
* --------------------------------------------------------------------------
* Notes: o Also handles \overbrace{}^{} and \underbrace{}_{} by way
* of isabove and isscript args.
* ======================================================================= */
/* --- entry point --- */
subraster *rastaccent ( char **expression, int size, subraster *basesp,
int accent, int isabove, int isscript )
{
/* -------------------------------------------------------------------------
Allocations and Declarations
-------------------------------------------------------------------------- */
char *texsubexpr(), subexpr[8192]; /* parse subexpr to be accented */
char *texscripts(), *script=NULL, /* \under,overbrace allow scripts */
subscript[512], supscript[512]; /* scripts parsed from expression */
subraster *rasterize(), *subsp=NULL, *scrsp=NULL; /*rasterize subexpr,script*/
subraster *rastack(), *accsubsp=NULL; /* stack accent, subexpr, script */
subraster *accent_subraster(), *accsp=NULL; /*raster for the accent itself*/
int accheight=0, accwidth=0, /* height, width of accent */
subheight=0, subwidth=0, pixsz=0; /* height,width,pixsz of subexpr */
int delete_subraster(); /*free work areas in case of error*/
int vspace = 0; /*vertical space between accent,sub*/
/* -------------------------------------------------------------------------
Obtain subexpression to be accented, and rasterize it
-------------------------------------------------------------------------- */
/* --- parse for subexpr to be accented, and bump expression past it --- */
*expression = texsubexpr(*expression,subexpr,0,"{","}",0,0);
if ( *subexpr=='\000' ) /* couldn't get subexpression */
goto end_of_job; /* nothing to do, so quit */
/* --- rasterize subexpression to be accented --- */
if ( (subsp = rasterize(subexpr,size)) /*rasterize subexpr at original size*/
== NULL ) goto end_of_job; /* quit if failed */
/* -------------------------------------------------------------------------
determine desired accent width and height
-------------------------------------------------------------------------- */
/* --- first get height and width of subexpr --- */
subheight = (subsp->image)->height; /* height of subexpr */
subwidth = (subsp->image)->width; /* and its width is overall width */
pixsz = (subsp->image)->pixsz; /* original pixsz remains constant */
/* --- determine desired width, height of accent --- */
accwidth = subwidth; /* same width as subexpr */
accheight = 4; /* default for bars */
switch ( accent )
{ default: break; /* default okay */
case DOTACCENT: case DDOTACCENT:
accheight = (size<4? 3:4); /* default for dots */
break;
case VECACCENT:
vspace = 1; /* set 1-pixel vertical space */
case HATACCENT:
accheight = 7; /* default */
if ( subwidth < 10 ) accheight = 5; /* unless small width */
else if ( subwidth > 25 ) accheight = 9; /* or large */
break;
} /* --- end-of-switch(accent) --- */
accheight = min2(accheight,subheight); /*never higher than accented subexpr*/
/* -------------------------------------------------------------------------
construct accent, and construct subraster with accent over (or under) subexpr
-------------------------------------------------------------------------- */
/* --- first construct accent --- */
if ( (accsp = accent_subraster(accent,accwidth,accheight,pixsz)) /* accent */
== NULL ) goto end_of_job; /* quit if failed to build accent */
/* --- now stack accent above (or below) subexpr, and free both args --- */
accsubsp = (isabove? rastack(subsp,accsp,1,vspace,1,3)/*accent above subexpr*/
: rastack(accsp,subsp,2,vspace,1,3)); /*accent below subexpr*/
if ( accsubsp == NULL ) /* failed to stack accent */
{ delete_subraster(subsp); /* free unneeded subsp */
delete_subraster(accsp); /* and unneeded accsp */
goto end_of_job; } /* and quit */
/* -------------------------------------------------------------------------
look for super/subscript (annotation for over/underbrace)
-------------------------------------------------------------------------- */
/* --- first check whether accent permits accompanying annotations --- */
if ( !isscript ) goto end_of_job; /* no annotations for this accent */
/* --- now get scripts if there actually are any --- */
*expression = texscripts(*expression,subscript,supscript,(isabove?2:1));
script = (isabove? supscript : subscript); /*select above^ or below_ script*/
if ( *script == '\000' ) goto end_of_job; /* no accompanying script */
/* --- rasterize script annotation at size-2 --- */
if ( (scrsp = rasterize(script,size-2)) /* rasterize script at size-2 */
== NULL ) goto end_of_job; /* quit if failed */
/* --- stack annotation above (or below) accent, and free both args --- */
accsubsp = (isabove? rastack(accsubsp,scrsp,1,0,1,3) /* accent above base */
: rastack(scrsp,accsubsp,2,0,1,3)); /* accent below base */
/* -------------------------------------------------------------------------
return final result to caller
-------------------------------------------------------------------------- */
end_of_job:
if ( accsubsp != NULL ) /* initialize subraster parameters */
accsubsp->size = size; /* propagate font size forward */
return ( accsubsp );
} /* --- end-of-function rastaccent() --- */
/* ==========================================================================
* Function: rastfont (expression,size,basesp,ifontnum,arg2,arg3)
* Purpose: \cal{}, \scr{}, \etc handler, returns subraster corresponding
* to char(s) within {}'s rendered at size
* --------------------------------------------------------------------------
* Arguments: expression (I/O) char ** to first char of null-terminated
* string immediately following \font to be
* rasterized, and returning ptr immediately
* following last character processed.
* size (I) int containing 0-5 default font size
* basesp (I) subraster * to character (or subexpression)
* immediately preceding \accent
* (unused, but passed for consistency)
* ifontnum (I) int containing 1 for \cal{}, 2 for \scr{}
* arg2 (I) int unused
* arg3 (I) int unused
* --------------------------------------------------------------------------
* Returns: ( subraster * ) ptr to subraster corresponding to chars
* between {}'s, or NULL for any parsing error
* --------------------------------------------------------------------------
* Notes: o
* ======================================================================= */
/* --- entry point --- */
subraster *rastfont ( char **expression, int size, subraster *basesp,
int ifontnum, int arg2, int arg3 )
{
/* -------------------------------------------------------------------------
Allocations and Declarations
-------------------------------------------------------------------------- */
char *texsubexpr(), fontchars[8192], /*parse chars to be rendered in font*/
subexpr[8192]; /* turn \cal{AB} into \calA\calB */
char *pfchars=fontchars, fchar='\0'; /* run thru fontchars one at a time*/
char *name = NULL; /* fontinfo[ifontnum].name */
int family = 0, /* fontinfo[ifontnum].family */
istext = 0, /* fontinfo[ifontnum].istext */
class = 0; /* fontinfo[ifontnum].class */
subraster *rasterize(), *fontsp=NULL, /* rasterize chars in font */
*rastflags(); /* or just set flag to switch font */
int oldsmashmargin = smashmargin; /* turn off smash in text mode */
#if 0
/* --- fonts recognized by rastfont --- */
static int nfonts = 6; /* legal font #'s are 1...nfonts */
static struct {char *name; int class;}
fonts[] =
{ /* --- name class 1=upper,2=alpha,3=alnum,4=lower,5=digit,9=all --- */
{ "\\math", 0 },
{ "\\mathcal", 1 }, /*(1) calligraphic, uppercase */
{ "\\mathscr", 1 }, /*(2) rsfs/script, uppercase */
{ "\\textrm", -1 }, /*(3) \rm,\text{abc} --> {\rm~abc} */
{ "\\textit", -1 }, /*(4) \it,\textit{abc}-->{\it~abc} */
{ "\\mathbb", -1 }, /*(5) \bb,\mathbb{abc}-->{\bb~abc} */
{ "\\mathbf", -1 }, /*(6) \bf,\mathbf{abc}-->{\bf~abc} */
{ NULL, 0 }
} ; /* --- end-of-fonts[] --- */
#endif
/* -------------------------------------------------------------------------
first get font name and class to determine type of conversion desired
-------------------------------------------------------------------------- */
if (ifontnum<=0 || ifontnum>nfontinfo) ifontnum=0; /*math if out-of-bounds*/
name = fontinfo[ifontnum].name; /* font name */
family = fontinfo[ifontnum].family; /* font family */
istext = fontinfo[ifontnum].istext; /*true in text mode (respect space)*/
class = fontinfo[ifontnum].class; /* font class */
if ( istext ) /* text (respect blanks) */
smashmargin = 0; /* don't smash internal blanks */
/* -------------------------------------------------------------------------
now convert \font{abc} --> {\font~abc}, or convert ABC to \calA\calB\calC
-------------------------------------------------------------------------- */
if ( 1 || class<0 ) /* not character-by-character */
{
/* ---
if \font not immediately followed by { then it has no arg, so just set flag
------------------------------------------------------------------------ */
if ( *(*expression) != '{' ) /* no \font arg, so just set flag */
{
if ( msgfp!=NULL && msglevel>=99 )
fprintf(msgfp,"rastfont> \\%s rastflags() for font#%d\n",name,ifontnum);
fontsp = rastflags(expression,size,basesp,ISFONTFAM,ifontnum,arg3);
goto end_of_job;
} /* --- end-of-if(*(*expression)!='{') --- */
/* ---
convert \font{abc} --> {\font~abc}
---------------------------------- */
/* --- parse for {fontchars} arg, and bump expression past it --- */
*expression = texsubexpr(*expression,fontchars,0,"{","}",0,0);
if ( msgfp!=NULL && msglevel>=99 )
fprintf(msgfp,"rastfont> \\%s fontchars=\"%s\"\n",name,fontchars);
/* --- convert all fontchars at the same time --- */
strcpy(subexpr,"{"); /* start off with opening { */
strcat(subexpr,name); /* followed by font name */
strcat(subexpr,"~"); /* followed by whitespace */
strcat(subexpr,fontchars); /* followed by all the chars */
strcat(subexpr,"}"); /* terminate with closing } */
} /* --- end-of-if(class<0) --- */
else /* character-by-character */
{
/* ---
convert ABC to \calA\calB\calC
------------------------------ */
int isprevchar=0; /* true if prev char converted */
/* --- parse for {fontchars} arg, and bump expression past it --- */
*expression = texsubexpr(*expression,fontchars,0,"{","}",0,0);
if ( msgfp!=NULL && msglevel>=99 )
fprintf(msgfp,"rastfont> \\%s fontchars=\"%s\"\n",name,fontchars);
/* --- convert fontchars one at a time --- */
strcpy(subexpr,"{\\rm~"); /* start off with opening {\rm */
strcpy(subexpr,"{"); /* nope, just start off with { */
for ( pfchars=fontchars; (fchar= *pfchars)!='\000'; pfchars++ )
{
if ( isthischar(fchar,WHITEMATH) ) /* some whitespace */
{ if ( 0 || istext ) /* and we're in a text mode font */
strcat(subexpr,"\\;"); } /* so respect whitespace */
else /* char to be displayed in font */
{ int exprlen = 0; /* #chars in subexpr before fchar */
int isinclass = 0; /* set true if fchar in font class */
/* --- class: 1=upper, 2=alpha, 3=alnum, 4=lower, 5=digit, 9=all --- */
switch ( class ) /* check if fchar is in font class */
{ default: break; /* no chars in unrecognized class */
case 1: if ( isupper((int)fchar) ) isinclass=1; break;
case 2: if ( isalpha((int)fchar) ) isinclass=1; break;
case 3: if ( isalnum((int)fchar) ) isinclass=1; break;
case 4: if ( islower((int)fchar) ) isinclass=1; break;
case 5: if ( isdigit((int)fchar) ) isinclass=1; break;
case 9: isinclass=1; break; }
if ( isinclass ) /* convert current char to \font */
{ strcat(subexpr,name); /* by prefixing it with font name */
isprevchar = 1; } /* and set flag to signal separator*/
else /* current char not in \font */
{ if ( isprevchar ) /* extra separator only after \font*/
if ( isalpha(fchar) ) /* separator only before alpha */
strcat(subexpr,"~"); /* need separator after \font */
isprevchar = 0; } /* reset flag for next char */
exprlen = strlen(subexpr); /* #chars so far */
subexpr[exprlen] = fchar; /*fchar immediately after \fontname*/
subexpr[exprlen+1] = '\000'; } /* replace terminating '\0' */
} /* --- end-of-for(pfchars) --- */
strcat(subexpr,"}"); /* add closing } */
} /* --- end-of-if/else(class<0) --- */
/* -------------------------------------------------------------------------
rasterize subexpression containing chars to be rendered at font
-------------------------------------------------------------------------- */
if ( msgfp!=NULL && msglevel>=99 )
fprintf(msgfp,"rastfont> subexpr=\"%s\"\n",subexpr);
if ( (fontsp = rasterize(subexpr,size)) /* rasterize chars in font */
== NULL ) goto end_of_job; /* and quit if failed */
/* -------------------------------------------------------------------------
back to caller with chars rendered in font
-------------------------------------------------------------------------- */
end_of_job:
smashmargin = oldsmashmargin; /* restore smash */
if ( istext && fontsp!=NULL ) /* raster contains text mode font */
fontsp->type = blanksignal; /* signal nosmash */
return ( fontsp ); /* chars rendered in font */
} /* --- end-of-function rastfont() --- */
/* ==========================================================================
* Function: rastbegin ( expression, size, basesp, arg1, arg2, arg3 )
* Purpose: \begin{}...\end{} handler, returns a subraster corresponding
* to array expression within environment, i.e., rewrites
* \begin{}...\end{} as mimeTeX equivalent, and rasterizes that.
* --------------------------------------------------------------------------
* Arguments: expression (I/O) char ** to first char of null-terminated
* string immediately following \begin to be
* rasterized, and returning ptr immediately
* following last character processed.
* size (I) int containing 0-4 default font size
* basesp (I) subraster * to character (or subexpression)
* immediately preceding \begin
* (unused, but passed for consistency)
* arg1 (I) int unused
* arg2 (I) int unused
* arg3 (I) int unused
* --------------------------------------------------------------------------
* Returns: ( subraster * ) ptr to subraster corresponding to array
* expression, or NULL for any parsing error
* --------------------------------------------------------------------------
* Notes: o
* ======================================================================= */
/* --- entry point --- */
subraster *rastbegin ( char **expression, int size, subraster *basesp,
int arg1, int arg2, int arg3 )
{
/* -------------------------------------------------------------------------
Allocations and Declarations
-------------------------------------------------------------------------- */
char *texsubexpr(), subexpr[8210], /* \begin{} environment paramaters */
*exprptr=NULL,*begptr=NULL,*endptr=NULL,*braceptr=NULL; /* ptrs */
char *begtoken="\\begin{", *endtoken="\\end{"; /*tokens we're looking for*/
int strreplace(); /* replace substring in string */
char *strchange(); /*\begin...\end --> {\begin...\end}*/
char *delims = (char *)NULL; /* mdelims[ienviron] */
subraster *rasterize(), *sp=NULL; /* rasterize environment */
int ienviron = 0; /* environs[] index */
int nbegins = 0; /* #\begins nested beneath this one*/
int envlen=0, sublen=0; /* #chars in environ, subexpr */
static int blevel = 0; /* \begin...\end nesting level */
static char *mdelims[] = { NULL, NULL, NULL, NULL,
"()","[]","{}","||","==", /* for pbBvVmatrix */
NULL, NULL, NULL, NULL, NULL, NULL, NULL, NULL, NULL, NULL, NULL,
NULL, NULL, NULL, NULL, NULL, NULL, NULL, NULL, NULL, NULL, NULL };
static char *environs[] = { /* types of environments we process*/
"eqnarray", /* 0 eqnarray environment */
"array", /* 1 array environment */
"matrix", /* 2 array environment */
"tabular", /* 3 array environment */
"pmatrix", /* 4 ( ) */
"bmatrix", /* 5 [ ] */
"Bmatrix", /* 6 { } */
"vmatrix", /* 7 | | */
"Vmatrix", /* 8 || || */
"gather", /* 9 gather environment */
"align", /* 10 align environment */
"verbatim", /* 11 verbatim environment */
"picture", /* 12 picture environment */
NULL }; /* trailer */
/* -------------------------------------------------------------------------
determine type of environment we're beginning
-------------------------------------------------------------------------- */
/* --- first bump nesting level --- */
blevel++; /* count \begin...\begin...'s */
/* --- \begin must be followed by {type_of_environment} --- */
exprptr = texsubexpr(*expression,subexpr,0,"{","}",0,0);
if ( *subexpr == '\000' ) goto end_of_job; /* no environment given */
while ( (delims=strchr(subexpr,'*')) != NULL ) /* have environment* */
strcpy(delims,delims+1); /* treat it as environment */
/* --- look up environment in our table --- */
for ( ienviron=0; ;ienviron++ ) /* search table till NULL */
if ( environs[ienviron] == NULL ) /* found NULL before match */
goto end_of_job; /* so quit */
else /* see if we have an exact match */
if ( memcmp(environs[ienviron],subexpr,strlen(subexpr)) == 0 ) /*match*/
break; /* leave loop with ienviron index */
/* --- accumulate any additional params for this environment --- */
*subexpr = '\000'; /* reset subexpr to empty string */
delims = mdelims[ienviron]; /* mdelims[] string for ienviron */
if ( delims != NULL ) /* add appropriate opening delim */
{ strcpy(subexpr,"\\"); /* start with \ for (,[,{,|,= */
strcat(subexpr,delims); /* then add opening delim */
subexpr[2] = '\000'; } /* remove extraneous closing delim */
switch ( ienviron )
{
default: goto end_of_job; /* environ not implemented yet */
case 0: /* \begin{eqnarray} */
strcpy(subexpr,"\\array{rcl$"); /* set default rcl for eqnarray */
break;
case 1: case 2: case 3: /* \begin{array} followed by {lcr} */
strcpy(subexpr,"\\array{"); /*start with mimeTeX \array{ command*/
skipwhite(exprptr); /* bump to next non-white char */
if ( *exprptr == '{' ) /* assume we have {lcr} argument */
{ exprptr = texsubexpr(exprptr,subexpr+7,0,"{","}",0,0); /*add on lcr*/
if ( *(subexpr+7) == '\000' ) goto end_of_job; /* quit if no lcr */
strcat(subexpr,"$"); } /* add terminating $ to lcr */
break;
case 4: case 5: case 6: /* \begin{pmatrix} or b,B,v,Vmatrix */
case 7: case 8:
strcat(subexpr,"\\array{"); /*start with mimeTeX \array{ command*/
break;
case 9: /* gather */
strcat(subexpr,"\\array{c$"); /* center equations */
break;
case 10: /* align */
strcat(subexpr,"\\array{rclrclrclrclrclrcl$"); /* a&=b & c&=d & etc */
break;
case 11: /* verbatim */
strcat(subexpr,"{\\rm "); /* {\rm ...} */
/*strcat(subexpr,"\\\\{\\rm ");*/ /* \\{\rm } doesn't work in context */
break;
case 12: /* picture */
strcat(subexpr,"\\picture"); /* picture environment */
skipwhite(exprptr); /* bump to next non-white char */
if ( *exprptr == '(' ) /*assume we have (width,height) arg*/
{ exprptr = texsubexpr(exprptr,subexpr+8,0,"(",")",0,1); /*add on arg*/
if ( *(subexpr+8) == '\000' ) goto end_of_job; } /* quit if no arg */
strcat(subexpr,"{"); /* opening { after (width,height) */
break;
} /* --- end-of-switch(ienviron) --- */
/* -------------------------------------------------------------------------
locate matching \end{...}
-------------------------------------------------------------------------- */
/* --- first \end following \begin --- */
if ( (endptr=strstr(exprptr,endtoken)) /* find 1st \end following \begin */
== NULL ) goto end_of_job; /* and quit if no \end found */
/* --- find matching endptr by pushing past any nested \begin's --- */
begptr = exprptr; /* start after first \begin{...} */
while ( 1 ) /*break when we find matching \end*/
{
/* --- first, set ptr to closing } terminating current \end{...} --- */
if ( (braceptr=strchr(endptr+1,'}')) /* find 1st } following \end{ */
== NULL ) goto end_of_job; /* and quit if no } found */
/* -- locate next nested \begin --- */
if ( (begptr=strstr(begptr,begtoken)) /* find next \begin{...} */
== NULL ) break; /*no more, so we have matching \end*/
begptr += strlen(begtoken); /* push ptr past token */
if ( begptr >= endptr ) break; /* past endptr, so not nested */
/* --- have nested \begin, so push forward to next \end --- */
nbegins++; /* count another nested \begin */
if ( (endptr=strstr(endptr+strlen(endtoken),endtoken)) /* find next \end */
== NULL ) goto end_of_job; /* and quit if none found */
} /* --- end-of-while(1) --- */
/* --- push expression past closing } of \end{} --- */
*expression = braceptr+1; /* resume processing after } */
/* -------------------------------------------------------------------------
add on everything (i.e., the ...'s) between \begin{}[{}] ... \end{}
-------------------------------------------------------------------------- */
/* --- add on everything, completing subexpr for \begin{}...\end{} --- */
sublen = strlen(subexpr); /* #chars in "preamble" */
envlen = (int)(endptr-exprptr); /* #chars between \begin{}{}...\end */
memcpy(subexpr+sublen,exprptr,envlen); /*concatanate environ after subexpr*/
subexpr[sublen+envlen] = '\000'; /* and null-terminate */
if ( 2 > 1 ) /* always... */
strcat(subexpr,"}"); /* ...followed by terminating } */
/* --- add terminating \right), etc, if necessary --- */
if ( delims != (char *)NULL ) /* need closing delim */
{ strcat(subexpr,"\\"); /* start with \ for ),],},|,= */
strcat(subexpr,delims+1); } /* add appropriate closing delim */
/* -------------------------------------------------------------------------
change nested \begin...\end to {\begin...\end} so \array{} can handle them
-------------------------------------------------------------------------- */
if ( nbegins > 0 ) /* have nested begins */
if ( blevel < 2 ) /* only need to do this once */
{
begptr = subexpr; /* start at beginning of subexpr */
while( (begptr=strstr(begptr,begtoken)) != NULL ) /* have \begin{...} */
{ strchange(0,begptr,"{"); /* \begin --> {\begin */
begptr += strlen(begtoken); } /* continue past {\begin */
endptr = subexpr; /* start at beginning of subexpr */
while( (endptr=strstr(endptr,endtoken)) != NULL ) /* have \end{...} */
if ( (braceptr=strchr(endptr+1,'}')) /* find 1st } following \end{ */
== NULL ) goto end_of_job; /* and quit if no } found */
else /* found terminating } */
{ strchange(0,braceptr,"}"); /* \end{...} --> \end{...}} */
endptr = braceptr+1; } /* continue past \end{...} */
} /* --- end-of-if(nbegins>0) --- */
/* -------------------------------------------------------------------------
post process as necessary
-------------------------------------------------------------------------- */
switch ( ienviron )
{
default: break; /* no post-processing required */
case 10: /* align */
strreplace(subexpr,"&=","#*@*#=",0); /* tag all &='s */
strreplace(subexpr,"&<","#*@*#<",0); /* tag all &<'s */
strreplace(subexpr,"&\\lt","#*@*#<",0); /* tag all &\lt's */
strreplace(subexpr,"&\\leq","#*@*#\\leq",0); /* tag all &\leq's */
strreplace(subexpr,"&>","#*@*#>",0); /* tag all &>'s */
strreplace(subexpr,"&\\gt","#*@*#>",0); /* tag all &\gt's */
strreplace(subexpr,"&\\geq","#*@*#\\geq",0); /* tag all &\geq's */
if ( nbegins < 1 ) /* don't modify nested arrays */
strreplace(subexpr,"&","\\hspace{10}&\\hspace{10}",0); /* add space */
strreplace(subexpr,"#*@*#=","& = &",0); /*restore and xlate tagged &='s*/
strreplace(subexpr,"#*@*#<","& \\lt &",0); /*restore, xlate tagged &<'s*/
strreplace(subexpr,"#*@*#\\leq","& \\leq &",0); /*xlate tagged &\leq's*/
strreplace(subexpr,"#*@*#>","& \\gt &",0); /*restore, xlate tagged &>'s*/
strreplace(subexpr,"#*@*#\\geq","& \\geq &",0); /*xlate tagged &\geq's*/
break;
case 11: /* verbatim */
strreplace(subexpr,"\n","\\\\",0); /* xlate \n newline to latex \\ */
/*strcat(subexpr,"\\\\");*/ /* add final latex \\ newline */
break;
case 12: /* picture */
strreplace(subexpr,"\\put "," ",0); /*remove \put's (not really needed)*/
strreplace(subexpr,"\\put(","(",0); /*remove \put's (not really needed)*/
strreplace(subexpr,"\\oval","\\circle",0); /* actually an ellipse */
break;
} /* --- end-of-switch(ienviron) --- */
/* -------------------------------------------------------------------------
return rasterized mimeTeX equivalent of \begin{}...\end{} environment
-------------------------------------------------------------------------- */
/* --- debugging output --- */
if ( msgfp!=NULL && msglevel>=99 )
fprintf(msgfp,"rastbegin> subexpr=%s\n",subexpr);
/* --- rasterize mimeTeX equivalent of \begin{}...\end{} environment --- */
sp = rasterize(subexpr,size); /* rasterize subexpr */
end_of_job:
blevel--; /* decrement \begin nesting level */
return ( sp ); /* back to caller with sp or NULL */
} /* --- end-of-function rastbegin() --- */
/* ==========================================================================
* Function: rastarray ( expression, size, basesp, arg1, arg2, arg3 )
* Purpose: \array handler, returns a subraster corresponding to array
* expression (immediately following \array) at font size
* --------------------------------------------------------------------------
* Arguments: expression (I/O) char ** to first char of null-terminated
* string immediately following \array to be
* rasterized, and returning ptr immediately
* following last character processed.
* size (I) int containing 0-4 default font size
* basesp (I) subraster * to character (or subexpression)
* immediately preceding \array
* (unused, but passed for consistency)
* arg1 (I) int unused
* arg2 (I) int unused
* arg3 (I) int unused
* --------------------------------------------------------------------------
* Returns: ( subraster * ) ptr to subraster corresponding to array
* expression, or NULL for any parsing error
* --------------------------------------------------------------------------
* Notes: o Summary of syntax...
* \array{3,lcrBC$a&b&c\\d&e&f\\etc}
* o The 3,lcrBC$ part is an optional "preamble". The lcr means
* what you think, i.e., "horizontal" left,center,right
* justification down corresponding column. The new BC means
* "vertical" baseline,center justification across corresponding
* row. The leading 3 specifies the font size 0-4 to be used.
* You may also specify +1,-1,+2,-2, etc, which is used as an
* increment to the current font size, e.g., -1,lcr$ uses
* one font size smaller than current. Without a leading
* + or -, the font size is "absolute".
* o The preamble can also be just lcrBC$ without a leading
* size-part, or just 3$ without a trailing lcrBC-part.
* The default size is whatever is current, and the
* default justification is c(entered) and B(aseline).
* ======================================================================= */
/* --- entry point --- */
subraster *rastarray ( char **expression, int size, subraster *basesp,
int arg1, int arg2, int arg3 )
{
/* -------------------------------------------------------------------------
Allocations and Declarations
-------------------------------------------------------------------------- */
char *texsubexpr(), subexpr[8210], *exprptr, /* parse array subexpr */
subtok[4096], *subptr=subtok, /* & or \\ inside { }'s not a delim*/
token[4096], *tokptr=token, /* token from subexpr to rasterize */
*preamble(), *preptr=token; /*process optional size,lcr preamble*/
char *coldelim="&", *rowdelim="\\"; /* need escaped rowdelim */
int maxarraysz = 64; /* max #rows, cols */
int justify[65]={0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0, /* -1,0,+1 = l,c,r */
0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,
0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0},
hline[65]={0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0, /* hline above row? */
0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,
0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0},
vline[65]={0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0, /*vline left of col?*/
0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,
0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0},
colwidth[65]={0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0, /*widest tokn in col*/
0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,
0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0},
rowheight[65]={0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0, /* "highest" in row */
0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,
0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0},
fixcolsize[65]={0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0, /*1=fixed col width*/
0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,
0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0},
fixrowsize[65]={0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0, /*1=fixed row height*/
0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,
0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0},
rowbaseln[65]={0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0, /* baseline for row */
0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,
0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0},
rowcenter[65]={0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0, /*true = vcenter row*/
0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,
0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0};
static int /* --- propagate global values across arrays --- */
gjustify[65]={0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0, /* -1,0,+1 = l,c,r */
0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,
0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0},
gcolwidth[65]={0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0, /*widest tokn in col*/
0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,
0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0},
growheight[65]={0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0, /* "highest" in row */
0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,
0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0},
gfixcolsize[65]={0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0, /*1=fixed col width*/
0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,
0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0},
gfixrowsize[65]={0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0, /*1=fixed row height*/
0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,
0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0},
growcenter[65]={0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0, /*true = vcenter row*/
0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,
0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0};
int rowglobal=0, colglobal=0, /* true to set global values */
rowpropagate=0, colpropagate=0; /* true if propagating values */
int irow,nrows=0, icol,ncols[65], /*#rows in array, #cols in each row*/
maxcols=0; /* max# cols in any single row */
int itoken, ntokens=0, /* index, total #tokens in array */
subtoklen=0, /* strlen of {...} subtoken */
istokwhite=1, /* true if token all whitespace */
nnonwhite=0; /* #non-white tokens */
int isescape=0,wasescape=0, /* current,prev chars escape? */
ischarescaped=0, /* is current char escaped? */
nescapes=0; /* #consecutive escapes */
subraster *rasterize(), *toksp[1025], /* rasterize tokens */
*new_subraster(), *arraysp=NULL; /* subraster for entire array */
raster *arrayrp=NULL; /* raster for entire array */
int delete_subraster(); /* free toksp[] workspace at eoj */
int rowspace=2, colspace=4, /* blank space between rows, cols */
hspace=1, vspace=1; /*space to accommodate hline,vline*/
int width=0, height=0, /* width,height of array */
leftcol=0, toprow=0; /*upper-left corner for cell in it*/
int rastput(); /* embed tokens/cells in array */
int rule_raster(); /* draw hlines and vlines in array */
char *hlchar="\\hline", *hdchar="\\hdash"; /* token signals hline */
char *texchar(), hltoken[1025]; /* extract \hline from token */
int ishonly=0, hltoklen, minhltoklen=3; /*flag, token must be \hl or \hd*/
int isnewrow=1; /* true for new row */
int pixsz = 1; /*default #bits per pixel, 1=bitmap*/
/* -------------------------------------------------------------------------
Macros to determine extra raster space required for vline/hline
-------------------------------------------------------------------------- */
#define vlinespace(icol) \
( vline[icol] == 0? 0 : /* no vline so no space needed */ \
( icol<1 || icol>=maxcols? vspace+(colspace+1)/2 : vspace ) )
#define hlinespace(irow) \
( hline[irow] == 0? 0 : /* no hline so no space needed */ \
( irow<1 || irow>=nrows? hspace+(rowspace+1)/2 : hspace ) )
/* -------------------------------------------------------------------------
Obtain array subexpression
-------------------------------------------------------------------------- */
/* --- parse for array subexpression, and bump expression past it --- */
subexpr[1] = *subexpr = ' '; /* set two leading blanks */
*expression = texsubexpr(*expression,subexpr+2,0,"{","}",0,0);
if ( msglevel>=29 && msgfp!=NULL ) /* debugging, display array */
fprintf(msgfp,"rastarray> %.256s\n",subexpr+2);
if ( *(subexpr+2)=='\000' ) /* couldn't get subexpression */
goto end_of_job; /* nothing to do, so quit */
/* -------------------------------------------------------------------------
process optional size,lcr preamble if present
-------------------------------------------------------------------------- */
/* --- reset size, get lcr's, and push exprptr past preamble --- */
exprptr = preamble(subexpr+2,&size,preptr); /* reset size and get lcr's */
/* --- init with global values --- */
for(icol=0; icol<=maxarraysz; icol++) { /* propagate global values... */
justify[icol] = gjustify[icol]; /* -1,0,+1 = l,c,r */
colwidth[icol] = gcolwidth[icol]; /* column width */
rowheight[icol] = growheight[icol]; /* row height */
fixcolsize[icol] = gfixcolsize[icol]; /* 1=fixed col width */
fixrowsize[icol] = gfixrowsize[icol]; /* 1=fixed row height */
rowcenter[icol] = growcenter[icol]; } /* true = vcenter row */
/* --- process lcr's, etc in preamble --- */
itoken = 0; /* debugging flag */
if ( msglevel>=29 && msgfp!=NULL ) /* debugging, display preamble */
if ( *preptr != '\000' ) /* if we have one */
fprintf(msgfp,"rastarray> preamble= \"%.256s\"\nrastarray> preamble: ",
preptr);
irow = icol = 0; /* init lcr counts */
while ( *preptr != '\000' ) /* check preamble text for lcr */
{
char prepchar = *preptr; /* current preamble character */
int prepcase = (islower(prepchar)?1:(isupper(prepchar)?2:0)); /*1,2,or 0*/
if ( irow<maxarraysz && icol<maxarraysz )
switch ( /*tolower*/(prepchar) )
{ default: break; /* just flush unrecognized chars */
case 'l': justify[icol] = (-1); /*left-justify this column*/
if (colglobal) gjustify[irow] = justify[irow]; break;
case 'c': justify[icol] = (0); /* center this column */
if (colglobal) gjustify[irow] = justify[irow]; break;
case 'r': justify[icol] = (+1); /* right-justify this col */
if (colglobal) gjustify[irow] = justify[irow]; break;
case '|': vline[icol] += 1; break; /* solid vline left of col */
case '.': vline[icol] = (-1); break; /*dashed vline left of col */
case 'b': prepchar='B'; prepcase=2; /* alias for B */
case 'B': break; /* baseline-justify row */
case 'v': prepchar='C'; prepcase=2; /* alias for C */
case 'C': rowcenter[irow] = 1; /* vertically center row */
if (rowglobal) growcenter[irow] = rowcenter[irow]; break;
case 'g': colglobal=1; prepcase=0; break; /* set global col values */
case 'G': rowglobal=1; prepcase=0; break; /* set global row values */
case '#': colglobal=rowglobal=1; break; } /* set global col,row vals */
if ( msglevel>=29 && msgfp!=NULL ) /* debugging */
fprintf(msgfp," %c[%d]",prepchar,
(prepcase==1?icol+1:(prepcase==2?irow+1:0)));
preptr++; /* check next char for lcr */
itoken++; /* #lcr's processed (debugging only)*/
/* --- check for number or +number specifying colwidth or rowheight --- */
if ( prepcase != 0 ) /* only check upper,lowercase */
{
int ispropagate = (*preptr=='+'?1:0); /* leading + propagates width/ht */
if ( ispropagate ) /* set row or col propagation */
if ( prepcase == 1 ) colpropagate = 1; /* propagating col values */
else if ( prepcase == 2 ) rowpropagate = 1; /* propagating row values */
if ( !colpropagate && prepcase == 1 )
{ colwidth[icol] = 0; /* reset colwidth */
fixcolsize[icol] = 0; } /* reset width flag */
if ( !rowpropagate && prepcase == 2 )
{ rowheight[irow] = 0; /* reset row height */
fixrowsize[irow] = 0; } /* reset height flag */
if ( ispropagate ) preptr++; /* bump past leading + */
if ( isdigit(*preptr) ) /* digit follows character */
{ char *endptr = NULL; /* preptr set to 1st char after num*/
int size = (int)(strtol(preptr,&endptr,10)); /* interpret number */
char *whchars="?wh"; /* debugging width/height labels */
preptr = endptr; /* skip over all digits */
if ( size==0 || (size>=3&&size<=500) ) { /* sanity check */
int index; /* icol,irow...maxarraysz index */
if ( prepcase == 1 ) /* lowercase signifies colwidth */
for(index=icol; index<=maxarraysz; index++) { /*propagate col size*/
colwidth[index] = size; /* set colwidth to fixed size */
fixcolsize[index] = (size>0?1:0); /* set fixed width flag */
justify[index] = justify[icol]; /* and propagate justification */
if ( colglobal ) { /* set global values */
gcolwidth[index] = colwidth[index]; /* set global col width */
gfixcolsize[index] = fixcolsize[index]; /*set global width flag*/
gjustify[index] = justify[icol]; } /* set global col justify */
if ( !ispropagate ) break; } /* don't propagate */
else /* uppercase signifies rowheight */
for(index=irow; index<=maxarraysz; index++) { /*propagate row size*/
rowheight[index] = size; /* set rowheight to size */
fixrowsize[index] = (size>0?1:0); /* set fixed height flag */
rowcenter[index] = rowcenter[irow]; /* and propagate row center */
if ( rowglobal ) { /* set global values */
growheight[index] = rowheight[index]; /* set global row height */
gfixrowsize[index] = fixrowsize[index]; /*set global height flag*/
growcenter[index] = rowcenter[irow]; } /*set global row center*/
if ( !ispropagate ) break; } /* don't propagate */
} /* --- end-of-if(size>=3&&size<=500) --- */
if ( msglevel>=29 && msgfp!=NULL ) /* debugging */
fprintf(msgfp,":%c=%d/fix#%d",whchars[prepcase],
(prepcase==1?colwidth[icol]:rowheight[irow]),
(prepcase==1?fixcolsize[icol]:fixrowsize[irow]));
} /* --- end-of-if(isdigit()) --- */
} /* --- end-of-if(prepcase!=0) --- */
if ( prepcase == 1 ) icol++; /* bump col if lowercase lcr */
else if ( prepcase == 2 ) irow++; /* bump row if uppercase BC */
} /* --- end-of-while(*preptr!='\000') --- */
if ( msglevel>=29 && msgfp!=NULL ) /* debugging, emit final newline */
if ( itoken > 0 ) /* if we have preamble */
fprintf(msgfp,"\n");
/* -------------------------------------------------------------------------
tokenize and rasterize components a & b \\ c & d \\ etc of subexpr
-------------------------------------------------------------------------- */
/* --- rasterize tokens one at a time, and maintain row,col counts --- */
ncols[nrows] = 0; /* no tokens/cols in top row yet */
while ( 1 ) /* scan chars till end */
{
/* --- local control flags --- */
int iseox = (*exprptr == '\000'), /* null signals end-of-expression */
iseor = iseox, /* \\ or eox signals end-of-row */
iseoc = iseor; /* & or eor signals end-of-col */
/* --- check for escapes --- */
isescape = isthischar(*exprptr,ESCAPE); /* is current char escape? */
wasescape= (!isnewrow&&isthischar(*(exprptr-1),ESCAPE)); /*prev char esc?*/
nescapes = (wasescape?nescapes+1:0); /* # preceding consecutive escapes */
ischarescaped = (nescapes%2==0?0:1); /* is current char escaped? */
/* -----------------------------------------------------------------------
check for {...} subexpression starting from where we are now
------------------------------------------------------------------------ */
if ( *exprptr == '{' /* start of {...} subexpression */
&& !ischarescaped ) /* if not escaped \{ */
{
subptr = texsubexpr(exprptr,subtok,4095,"{","}",1,1); /*entire subexpr*/
subtoklen = strlen(subtok); /* #chars in {...} */
memcpy(tokptr,exprptr,subtoklen); /* copy {...} to accumulated token */
tokptr += subtoklen; /* bump tokptr to end of token */
exprptr += subtoklen; /* and bump exprptr past {...} */
istokwhite = 0; /* signal non-empty token */
continue; /* continue with char after {...} */
} /* --- end-of-if(*exprptr=='{') --- */
/* -----------------------------------------------------------------------
check for end-of-row(\\) and/or end-of-col(&)
------------------------------------------------------------------------ */
/* --- check for (escaped) end-of-row delimiter --- */
if ( isescape && !ischarescaped ) /* current char is escaped */
if ( isthischar(*(exprptr+1),rowdelim) /* next char is rowdelim */
|| *(exprptr+1) == '\000' ) /* or a pathological null */
{ iseor = 1; /* so set end-of-row flag */
wasescape=isescape=nescapes = 0; } /* reset flags for new row */
/* --- check for end-of-col delimiter --- */
if (iseor /* end-of-row signals end-of-col */
|| (!ischarescaped&&isthischar(*exprptr,coldelim))) /*or unescaped coldel*/
iseoc = 1; /* so set end-of-col flag */
/* -----------------------------------------------------------------------
rasterize completed token
------------------------------------------------------------------------ */
if ( iseoc ) /* we have a completed token */
{
*tokptr = '\000'; /* first, null-terminate token */
/* --- check first token in row for \hline or \hdash --- */
ishonly = 0; /*init for token not only an \hline*/
if ( ncols[nrows] == 0 ) /*\hline must be first token in row*/
{
tokptr=token; skipwhite(tokptr); /* skip whitespace after // */
tokptr = texchar(tokptr,hltoken); /* extract first char from token */
hltoklen = strlen(hltoken); /* length of first char */
if ( hltoklen >= minhltoklen ) /*token must be at least \hl or \hd*/
if ( memcmp(hlchar,hltoken,hltoklen) == 0 ) /* we have an \hline */
hline[nrows] += 1; /* bump \hline count for row */
else if ( memcmp(hdchar,hltoken,hltoklen) == 0 ) /*we have an \hdash*/
hline[nrows] = (-1); /* set \hdash flag for row */
if ( hline[nrows] != 0 ) /* \hline or \hdash prefixes token */
{ skipwhite(tokptr); /* flush whitespace after \hline */
if ( *tokptr == '\000' /* end-of-expression after \hline */
|| isthischar(*tokptr,coldelim) ) /* or unescaped coldelim */
{ istokwhite = 1; /* so token contains \hline only */
if ( iseox ) ishonly = 1; } /* ignore entire row at eox */
else /* token contains more than \hline */
strcpy(token,tokptr); } /* so flush \hline from token */
} /* --- end-of-if(ncols[nrows]==0) --- */
/* --- rasterize completed token --- */
toksp[ntokens] = (istokwhite? NULL : /* don't rasterize empty token */
rasterize(token,size)); /* rasterize non-empty token */
if ( toksp[ntokens] != NULL ) /* have a rasterized token */
nnonwhite++; /* bump rasterized token count */
/* --- maintain colwidth[], rowheight[] max, and rowbaseln[] --- */
if ( toksp[ntokens] != NULL ) /* we have a rasterized token */
{
/* --- update max token "height" in current row, and baseline --- */
int twidth = ((toksp[ntokens])->image)->width, /* width of token */
theight = ((toksp[ntokens])->image)->height, /* height of token */
tbaseln = (toksp[ntokens])->baseline, /* baseline of token */
rheight = rowheight[nrows], /* current max height for row */
rbaseln = rowbaseln[nrows]; /* current baseline for max height */
if ( 0 || fixrowsize[nrows]==0 ) /* rowheight not fixed */
rowheight[nrows] = /*max2( rheight,*/( /* current (max) rowheight */
max2(rbaseln+1,tbaseln+1) /* max height above baseline */
+ max2(rheight-rbaseln-1,theight-tbaseln-1) ); /* plus max below */
rowbaseln[nrows] = max2(rbaseln,tbaseln); /*max space above baseline*/
/* --- update max token width in current column --- */
icol = ncols[nrows]; /* current column index */
if ( 0 || fixcolsize[icol]==0 ) /* colwidth not fixed */
colwidth[icol] = max2(colwidth[icol],twidth); /*widest token in col*/
} /* --- end-of-if(toksp[]!=NULL) --- */
/* --- bump counters --- */
if ( !ishonly ) /* don't count only an \hline */
{ ntokens++; /* bump total token count */
ncols[nrows] += 1; } /* and bump #cols in current row */
/* --- get ready for next token --- */
tokptr = token; /* reset ptr for next token */
istokwhite = 1; /* next token starts all white */
} /* --- end-of-if(iseoc) --- */
/* -----------------------------------------------------------------------
bump row as necessary
------------------------------------------------------------------------ */
if ( iseor ) /* we have a completed row */
{
maxcols = max2(maxcols,ncols[nrows]); /* max# cols in array */
if ( ncols[nrows]>0 || hline[nrows]==0 ) /*ignore row with only \hline*/
nrows++; /* bump row count */
ncols[nrows] = 0; /* no cols in this row yet */
if ( !iseox ) /* don't have a null yet */
{ exprptr++; /* bump past extra \ in \\ delim */
iseox = (*exprptr == '\000'); } /* recheck for pathological \null */
isnewrow = 1; /* signal start of new row */
} /* --- end-of-if(iseor) --- */
else
isnewrow = 0; /* no longer first col of new row */
/* -----------------------------------------------------------------------
quit when done, or accumulate char in token and proceed to next char
------------------------------------------------------------------------ */
/* --- quit when done --- */
if ( iseox ) break; /* null terminator signalled done */
/* --- accumulate chars in token --- */
if ( !iseoc ) /* don't accumulate delimiters */
{ *tokptr++ = *exprptr; /* accumulate non-delim char */
if ( !isthischar(*exprptr,WHITESPACE) ) /* this token isn't empty */
istokwhite = 0; } /* so reset flag to rasterize it */
/* --- ready for next char --- */
exprptr++; /* bump ptr */
} /* --- end-of-while(*exprptr!='\000') --- */
/* --- make sure we got something to do --- */
if ( nnonwhite < 1 ) /* completely empty array */
goto end_of_job; /* NULL back to caller */
/* -------------------------------------------------------------------------
determine dimensions of array raster and allocate it
-------------------------------------------------------------------------- */
/* --- adjust colspace --- */
colspace = 2 + 2*size; /* temp kludge */
/* --- reset propagated sizes at boundaries of array --- */
colwidth[maxcols] = rowheight[nrows] = 0; /* reset explicit 0's at edges */
/* --- determine width of array raster --- */
width = colspace*(maxcols-1); /* empty space between cols */
if ( msglevel>=29 && msgfp!=NULL ) /* debugging */
fprintf(msgfp,"rastarray> %d cols, widths: ",maxcols);
for ( icol=0; icol<=maxcols; icol++ ) /* and for each col */
{ width += colwidth[icol]; /*width of this col (0 for maxcols)*/
width += vlinespace(icol); /*plus space for vline, if present*/
if ( msglevel>=29 && msgfp!=NULL ) /* debugging */
fprintf(msgfp," %d=%2d+%d",icol+1,colwidth[icol],(vlinespace(icol))); }
/* --- determine height of array raster --- */
height = rowspace*(nrows-1); /* empty space between rows */
if ( msglevel>=29 && msgfp!=NULL ) /* debugging */
fprintf(msgfp,"\nrastarray> %d rows, heights: ",nrows);
for ( irow=0; irow<=nrows; irow++ ) /* and for each row */
{ height += rowheight[irow]; /*height of this row (0 for nrows)*/
height += hlinespace(irow); /*plus space for hline, if present*/
if ( msglevel>=29 && msgfp!=NULL ) /* debugging */
fprintf(msgfp," %d=%2d+%d",irow+1,rowheight[irow],(hlinespace(irow))); }
/* --- allocate subraster and raster for array --- */
if ( msglevel>=29 && msgfp!=NULL ) /* debugging */
fprintf(msgfp,"\nrastarray> tot width=%d(colspc=%d) height=%d(rowspc=%d)\n",
width,colspace, height,rowspace);
if ( (arraysp=new_subraster(width,height,pixsz)) /* allocate new subraster */
== NULL ) goto end_of_job; /* quit if failed */
/* --- initialize subraster parameters --- */
arraysp->type = IMAGERASTER; /* image */
arraysp->symdef = NULL; /* not applicable for image */
arraysp->baseline=min2(height/2+5,height-1); /*is a little above center good?*/
arraysp->size = size; /* size (probably unneeded) */
arrayrp = arraysp->image; /* raster embedded in subraster */
/* -------------------------------------------------------------------------
embed tokens/cells in array
-------------------------------------------------------------------------- */
itoken = 0; /* start with first token */
toprow = 0; /* start at top row of array */
for ( irow=0; irow<=nrows; irow++ ) /*tokens were accumulated row-wise*/
{
/* --- initialization for row --- */
int baseline = rowbaseln[irow]; /* baseline for this row */
if ( hline[irow] != 0 ) /* need hline above this row */
{ int hrow = (irow<1? 0 : toprow - rowspace/2); /* row for hline */
if ( irow >= nrows ) hrow = height-1; /* row for bottom hline */
rule_raster(arrayrp,hrow,0,width,1,(hline[irow]<0?1:0)); } /* hline */
if ( irow >= nrows ) break; /*just needed \hline for irow=nrows*/
toprow += hlinespace(irow); /* space for hline above irow */
leftcol = 0; /* start at leftmost column */
for ( icol=0; icol<ncols[irow]; icol++ ) /* go through cells in this row */
{
subraster *tsp = toksp[itoken]; /* token that belongs in this cell */
/* --- first adjust leftcol for vline to left of icol, if present ---- */
leftcol += vlinespace(icol); /* space for vline to left of col */
/* --- now rasterize cell ---- */
if ( tsp != NULL ) /* have a rasterized cell token */
{
/* --- local parameters --- */
int cwidth = colwidth[icol], /* total column width */
twidth = (tsp->image)->width, /* token width */
theight= (tsp->image)->height, /* token height */
tokencol = 0, /*H offset (init for left justify)*/
tokenrow = baseline - tsp->baseline;/*V offset (init for baseline)*/
/* --- adjust leftcol for vline to left of icol, if present ---- */
/*leftcol += vlinespace(icol);*/ /* space for vline to left of col */
/* --- reset justification (if not left-justified) --- */
if ( justify[icol] == 0 ) /* but user wants it centered */
tokencol = (cwidth-twidth+1)/2; /* so split margin left/right */
else if ( justify[icol] == 1 ) /* or user wants right-justify */
tokencol = cwidth-twidth; /* so put entire margin at left */
/* --- reset vertical centering (if not baseline-aligned) --- */
if ( rowcenter[irow] ) /* center cells in row vertically */
tokenrow = (rowheight[irow]-theight)/2; /* center row */
/* --- embed token raster at appropriate place in array raster --- */
rastput(arrayrp,tsp->image, /* overlay cell token in array */
toprow+ tokenrow, /*with aligned baseline or centered*/
leftcol+tokencol, 1); /* and justified as requested */
} /* --- end-of-if(tsp!=NULL) --- */
itoken++; /* bump index for next cell */
leftcol += colwidth[icol] + colspace /*move leftcol right for next col*/
/* + vlinespace(icol) */ ; /*don't add space for vline to left of col*/
} /* --- end-of-for(icol) --- */
toprow += rowheight[irow] + rowspace; /* move toprow down for next row */
} /* --- end-of-for(irow) --- */
/* -------------------------------------------------------------------------
draw vlines as necessary
-------------------------------------------------------------------------- */
leftcol = 0; /* start at leftmost column */
for ( icol=0; icol<=maxcols; icol++ ) /* check each col for a vline */
{
if ( vline[icol] != 0 ) /* need vline to left of this col */
{ int vcol = (icol<1? 0 : leftcol - colspace/2); /* column for vline */
if ( icol >= maxcols ) vcol = width-1; /*column for right edge vline*/
rule_raster(arrayrp,0,vcol,1,height,(vline[icol]<0?2:0)); } /* vline */
leftcol += vlinespace(icol); /* space for vline to left of col */
if ( icol < maxcols ) /* don't address past end of array */
leftcol += colwidth[icol] + colspace; /*move leftcol right for next col*/
} /* --- end-of-for(icol) --- */
/* -------------------------------------------------------------------------
free workspace and return final result to caller
-------------------------------------------------------------------------- */
end_of_job:
/* --- free workspace --- */
if ( ntokens > 0 ) /* if we have workspace to free */
while ( --ntokens >= 0 ) /* free each token subraster */
if ( toksp[ntokens] != NULL ) /* if we rasterized this cell */
delete_subraster(toksp[ntokens]); /* then free it */
/* --- return final result to caller --- */
return ( arraysp );
} /* --- end-of-function rastarray() --- */
/* ==========================================================================
* Function: rastpicture ( expression, size, basesp, arg1, arg2, arg3 )
* Purpose: \picture handler, returns subraster corresponding to picture
* expression (immediately following \picture) at font size
* --------------------------------------------------------------------------
* Arguments: expression (I/O) char ** to first char of null-terminated
* string immediately following \picture to be
* rasterized, and returning ptr immediately
* following last character processed.
* size (I) int containing 0-4 default font size
* basesp (I) subraster * to character (or subexpression)
* immediately preceding \picture
* (unused, but passed for consistency)
* arg1 (I) int unused
* arg2 (I) int unused
* arg3 (I) int unused
* --------------------------------------------------------------------------
* Returns: ( subraster * ) ptr to subraster corresponding to picture
* expression, or NULL for any parsing error
* --------------------------------------------------------------------------
* Notes: o Summary of syntax...
* \picture(width,height){(x,y){pic_elem}~(x,y){pic_elem}~etc}
* o
* ======================================================================= */
/* --- entry point --- */
subraster *rastpicture ( char **expression, int size, subraster *basesp,
int arg1, int arg2, int arg3 )
{
/* -------------------------------------------------------------------------
Allocations and Declarations
-------------------------------------------------------------------------- */
char *texsubexpr(), picexpr[2049], *picptr=picexpr, /* picture {expre} */
putexpr[256], *putptr,*multptr, /*[multi]put (x,y[;xinc,yinc;num])*/
pream[64], *preptr, /* optional put preamble */
picelem[1025]; /* picture element following put */
subraster *rasterize(), *picelemsp=NULL, /* rasterize picture elements */
*new_subraster(), *picturesp=NULL, /* subraster for entire picture */
*oldworkingbox = workingbox; /* save working box on entry */
raster *picturerp=NULL; /* raster for entire picture */
int delete_subraster(); /* free picelemsp[] workspace */
int pixsz = 1; /* pixels are one bit each */
double strtod(), /* convert ascii params to doubles */
x=0.0,y=0.0, /* x,y-coords for put,multiput*/
xinc=0.0,yinc=0.0; /* x,y-incrementss for multiput*/
int width=0, height=0, /* #pixels width,height of picture */
ewidth=0, eheight=0, /* pic element width,height */
ix=0,xpos=0, iy=0,ypos=0, /* mimeTeX x,y pixel coords */
num=1, inum; /* number reps, index of element */
int iscenter=0; /* center or lowerleft put position*/
int *oldworkingparam = workingparam, /* save working param on entry */
origin = 0; /* x,yinc ++=00 +-=01 -+=10 --=11 */
int rastput(); /* embed elements in picture */
int type_raster(); /* display debugging output */
/* -------------------------------------------------------------------------
First obtain (width,height) arguments immediately following \picture command
-------------------------------------------------------------------------- */
/* --- parse for (width,height) arguments, and bump expression past it --- */
*expression = texsubexpr(*expression,putexpr,254,"(",")",0,0);
if ( *putexpr == '\000' ) goto end_of_job; /* couldn't get (width,height) */
/* --- now interpret width,height returned in putexpr --- */
if ( (putptr=strchr(putexpr,',')) != NULL ) /* look for ',' in width,height*/
*putptr = '\000'; /* found it, so replace ',' by '\0'*/
width=height = iround(unitlength*strtod(putexpr,NULL)); /*width pixels*/
if ( putptr != NULL ) /* 2nd arg, if present, is height */
height = iround(unitlength*strtod(putptr+1,NULL)); /*in pixels*/
/* -------------------------------------------------------------------------
Then obtain entire picture {...} subexpression following (width,height)
-------------------------------------------------------------------------- */
/* --- parse for picture subexpression, and bump expression past it --- */
*expression = texsubexpr(*expression,picexpr,2047,"{","}",0,0);
if ( *picexpr == '\000' ) goto end_of_job; /* couldn't get {pic_elements} */
/* -------------------------------------------------------------------------
allocate subraster and raster for complete picture
-------------------------------------------------------------------------- */
/* --- sanity check on width,height args --- */
if ( width < 2 || width > 600
|| height < 2 || height > 600 ) goto end_of_job;
/* --- allocate and initialize subraster for constructed picture --- */
if ( (picturesp=new_subraster(width,height,pixsz)) /*allocate new subraster*/
== NULL ) goto end_of_job; /* quit if failed */
workingbox = picturesp; /* set workingbox to our picture */
/* --- initialize picture subraster parameters --- */
picturesp->type = IMAGERASTER; /* image */
picturesp->symdef = NULL; /* not applicable for image */
picturesp->baseline = height/2 + 2; /* is a little above center good? */
picturesp->size = size; /* size (probably unneeded) */
picturerp = picturesp->image; /* raster embedded in subraster */
if ( msgfp!=NULL && msglevel>=29 ) /* debugging */
fprintf(msgfp,"picture> width,height=%d,%d\n",width,height);
/* -------------------------------------------------------------------------
parse out each picture element, rasterize it, and place it in picture
-------------------------------------------------------------------------- */
while ( *picptr != '\000' ) /* until we run out of pic_elems */
{
/* -----------------------------------------------------------------------
first obtain leading \[multi]put(x,y[;xinc,yinc;num]) args for pic_elem
------------------------------------------------------------------------ */
/* --- init default values in case not explicitly supplied in args --- */
x=y=0.0; xinc=yinc=0.0; num=1; /* init default values */
iscenter = origin = 0; /* center, origin */
/* --- get (pream$x,y;xinc,yinc;num ) args and bump picptr past it --- */
while ( *picptr != '\000' ) /* skip invalid chars preceding ( */
if ( *picptr == '(' ) break; /* found opening ( */
else picptr++; /* else skip invalid char */
picptr = texsubexpr(picptr,putexpr,254,"(",")",0,0);
if ( *putexpr == '\000' ) goto end_of_job; /* couldn't get (x,y) */
/* --- first look for $-terminated or for any non-digit preamble --- */
*pream = '\000'; /* init preamble as empty string */
if ( (putptr=strchr(putexpr,'$')) != NULL ) /*check for $ pream terminator*/
{ *putptr++ = '\000'; /* replace $ by '\0', bump past $ */
strcpy(pream,putexpr); } /* copy leading preamble from put */
else /* look for any non-digit preamble */
{ for ( preptr=pream,putptr=putexpr; ; putptr++ )
if ( *putptr == '\000' /* end-of-putdata signalled */
|| !isalpha((int)(*putptr)) ) break; /* or found non-alpha char */
else *preptr++ = *putptr; /* copy alpha char to preamble */
*preptr = '\000'; } /* null-terminate preamble */
/* --- interpret preamble --- */
for ( preptr=pream; ; preptr++ ) /* examine each preamble char */
if ( *preptr == '\000' ) break; /* end-of-preamble signalled */
else switch ( tolower(*preptr) ) /* check lowercase preamble char */
{
default: break; /* unrecognized flag */
case 'c': iscenter=1; break; /* center pic_elem at x,y coords */
} /* --- end-of-switch --- */
/* --- interpret x,y;xinc,yinc;num following preamble --- */
if ( *putptr != '\000' ) /*check for put data after preamble*/
{
/* --- first squeeze preamble out of put expression --- */
if ( *pream != '\000' ) strcpy(putexpr,putptr); /* squeeze out preamble */
/* --- interpret x,y --- */
if ( (multptr=strchr(putexpr,';')) != NULL ) /*semicolon signals multiput*/
*multptr = '\000'; /* replace semicolon by '\0' */
if ( (putptr=strchr(putexpr,',')) != NULL ) /* comma separates x,y */
*putptr = '\000'; /* replace comma by '\0' */
if ( *putexpr != '\000' ) /* leading , may be placeholder */
x = unitlength*strtod(putexpr,NULL); /* x coord in pixels*/
if ( putptr != NULL ) /* 2nd arg, if present, is y coord */
y = unitlength*strtod(putptr+1,NULL); /* in pixels */
/* --- interpret xinc,yinc,num if we have a multiput --- */
if ( multptr != NULL ) /* found ';' signalling multiput */
{
if ( (preptr=strchr(multptr+1,';')) != NULL ) /* ';' preceding num arg*/
*preptr = '\000'; /* replace ';' by '\0' */
if ( (putptr=strchr(multptr+1,',')) != NULL ) /* ',' between xinc,yinc*/
*putptr = '\000'; /* replace ',' by '\0' */
if ( *(multptr+1) != '\000' ) /* leading , may be placeholder */
xinc = unitlength*strtod(multptr+1,NULL); /* xinc in pixels */
if ( putptr != NULL ) /* 2nd arg, if present, is yinc */
yinc = unitlength*strtod(putptr+1,NULL); /* in user pixels */
num = (preptr==NULL? 999 : atoi(preptr+1)); /*explicit num val or 999*/
} /* --- end-of-if(multptr!=NULL) --- */
} /* --- end-of-if(*preptr!='\000') --- */
if ( msgfp!=NULL && msglevel>=29 ) /* debugging */
fprintf(msgfp,
"picture> pream;x,y;xinc,yinc;num=\"%s\";%.2f,%.2f;%.2f,%.2f;%d\n",
pream,x,y,xinc,yinc,num);
/* -----------------------------------------------------------------------
now obtain {...} picture element following [multi]put, and rasterize it
------------------------------------------------------------------------ */
/* --- parse for {...} picture element and bump picptr past it --- */
picptr = texsubexpr(picptr,picelem,1023,"{","}",0,0);
if ( *picelem == '\000' ) goto end_of_job; /* couldn't get {pic_elem} */
if ( msgfp!=NULL && msglevel>=29 ) /* debugging */
fprintf(msgfp, "picture> picelem=\"%.50s\"\n",picelem);
/* --- rasterize picture element --- */
origin = 0; /* init origin as working param */
workingparam = &origin; /* and point working param to it */
picelemsp = rasterize(picelem,size); /* rasterize picture element */
if ( picelemsp == NULL ) continue; /* failed to rasterize, skip elem */
ewidth = (picelemsp->image)->width; /* width of element, in pixels */
eheight = (picelemsp->image)->height; /* height of element, in pixels */
if ( origin == 55 ) iscenter = 1; /* origin set to (.5,.5) for center*/
if ( msgfp!=NULL && msglevel>=29 ) /* debugging */
{ fprintf(msgfp, "picture> ewidth,eheight,origin,num=%d,%d,%d,%d\n",
ewidth,eheight,origin,num);
if ( msglevel >= 999 ) type_raster(picelemsp->image,msgfp); }
/* -----------------------------------------------------------------------
embed element in picture (once, or multiple times if requested)
------------------------------------------------------------------------ */
for ( inum=0; inum<num; inum++ ) /* once, or for num repetitions */
{
/* --- set x,y-coords for this iteration --- */
ix = iround(x); iy = iround(y); /* round x,y to nearest integer */
if ( iscenter ) /* place center of element at x,y */
{ xpos = ix - ewidth/2; /* x picture coord to center elem */
ypos = height - iy - eheight/2; } /* y pixel coord to center elem */
else /* default places lower-left at x,y*/
{ xpos = ix; /* set x pixel coord for left */
if ( origin==10 || origin==11 ) /* x,yinc's are -+ or -- */
xpos = ix - ewidth; /* so set for right instead */
ypos = height - iy - eheight; /* set y pixel coord for lower */
if ( origin==1 || origin==11 ) /* x,yinc's are +- or -- */
ypos = height - iy; } /* so set for upper instead */
if ( msgfp!=NULL && msglevel>=29 ) /* debugging */
fprintf(msgfp,
"picture> inum,x,y,ix,iy,xpos,ypos=%d,%.2f,%.2f,%d,%d,%d,%d\n",
inum,x,y,ix,iy,xpos,ypos);
/* --- embed token raster at xpos,ypos, and quit if out-of-bounds --- */
if ( !rastput(picturerp,picelemsp->image,ypos,xpos,0) ) break;
/* --- apply increment --- */
if ( xinc==0. && yinc==0. ) break; /* quit if both increments zero */
x += xinc; y += yinc; /* increment coords for next iter */
} /* --- end-of-for(inum) --- */
/* --- free picture element subraster after embedding it in picture --- */
delete_subraster(picelemsp); /* done with subraster, so free it */
} /* --- end-of-while(*picptr!=0) --- */
/* -------------------------------------------------------------------------
return picture constructed from pic_elements to caller
-------------------------------------------------------------------------- */
end_of_job:
workingbox = oldworkingbox; /* restore original working box */
workingparam = oldworkingparam; /* restore original working param */
return ( picturesp ); /* return our picture to caller */
} /* --- end-of-function rastpicture() --- */
/* ==========================================================================
* Function: rastline ( expression, size, basesp, arg1, arg2, arg3 )
* Purpose: \line handler, returns subraster corresponding to line
* parameters (xinc,yinc){xlen}
* --------------------------------------------------------------------------
* Arguments: expression (I/O) char ** to first char of null-terminated
* string immediately following \line to be
* rasterized, and returning ptr immediately
* following last character processed.
* size (I) int containing 0-4 default font size
* basesp (I) subraster * to character (or subexpression)
* immediately preceding \line
* (unused, but passed for consistency)
* arg1 (I) int unused
* arg2 (I) int unused
* arg3 (I) int unused
* --------------------------------------------------------------------------
* Returns: ( subraster * ) ptr to subraster corresponding to line
* requested, or NULL for any parsing error
* --------------------------------------------------------------------------
* Notes: o Summary of syntax...
* \line(xinc,yinc){xlen}
* o if {xlen} not given, then it's assumed xlen = |xinc|
* ======================================================================= */
/* --- entry point --- */
subraster *rastline ( char **expression, int size, subraster *basesp,
int arg1, int arg2, int arg3 )
{
/* -------------------------------------------------------------------------
Allocations and Declarations
-------------------------------------------------------------------------- */
char *texsubexpr(),linexpr[257], *xptr=linexpr; /*line(xinc,yinc){xlen}*/
subraster *new_subraster(), *linesp=NULL; /* subraster for line */
/*char *origexpression = *expression;*/ /*original expression after \line*/
int pixsz = 1; /* pixels are one bit each */
int thickness = 1; /* line thickness */
double strtod(), /* convert ascii params to doubles */
xinc=0.0, yinc=0.0, /* x,y-increments for line, */
xlen=0.0, ylen=0.0; /* x,y lengths for line */
int width=0, height=0, /* #pixels width,height of line */
rwidth=0, rheight=0; /*alloc width,height plus thickness*/
int istop=0, isright=0, /* origin at bot-left if x,yinc>=0 */
origin = 0; /* x,yinc: ++=00 +-=01 -+=10 --=11 */
int line_raster(); /* draw line in linesp->image */
/* -------------------------------------------------------------------------
obtain (xinc,yinc) arguments immediately following \line command
-------------------------------------------------------------------------- */
/* --- parse for (xinc,yinc) arguments, and bump expression past it --- */
*expression = texsubexpr(*expression,linexpr,253,"(",")",0,0);
if ( *linexpr == '\000' ) goto end_of_job; /* couldn't get (xinc,yinc) */
/* --- now interpret xinc,yinc;thickness returned in linexpr --- */
if ( (xptr=strchr(linexpr,';')) != NULL ) /* look for ';' after xinc,yinc */
{ *xptr = '\000'; /* terminate linexpr at ; */
thickness = (int)strtol(xptr+1,NULL,10); } /* get int thickness */
if ( (xptr=strchr(linexpr,',')) != NULL ) /* look for ',' in xinc,yinc */
*xptr = '\000'; /* found it, so replace ',' by '\0'*/
if ( *linexpr != '\000' ) /* check against missing 1st arg */
xinc = xlen = strtod(linexpr,NULL); /* xinc in user units */
if ( xptr != NULL ) /* 2nd arg, if present, is yinc */
yinc = ylen = strtod(xptr+1,NULL); /* in user units */
/* -------------------------------------------------------------------------
obtain optional {xlen} following (xinc,yinc), and calculate ylen
-------------------------------------------------------------------------- */
/* --- check if {xlen} given --- */
if ( *(*expression) == '{' ) /*have {xlen} if leading char is { */
{
/* --- parse {xlen} and bump expression past it, interpret as double --- */
*expression = texsubexpr(*expression,linexpr,253,"{","}",0,0);
if ( *linexpr == '\000' ) goto end_of_job; /* couldn't get {xlen} */
xlen = strtod(linexpr,NULL); /* xlen in user units */
/* --- set other values accordingly --- */
if ( xlen < 0.0 ) xinc = -xinc; /* if xlen negative, flip xinc sign*/
if ( xinc != 0.0 ) ylen = xlen*yinc/xinc; /* set ylen from xlen and slope*/
else xlen = 0.0; /* can't have xlen if xinc=0 */
} /* --- end-of-if(*(*expression)=='{') --- */
/* -------------------------------------------------------------------------
calculate width,height, etc, based on xlen,ylen, etc
-------------------------------------------------------------------------- */
/* --- force lengths positive --- */
xlen = absval(xlen); /* force xlen positive */
ylen = absval(ylen); /* force ylen positive */
/* --- calculate corresponding lengths in pixels --- */
width = max2(1,iround(unitlength*xlen)); /*scale by unitlength and round,*/
height = max2(1,iround(unitlength*ylen)); /* and must be at least 1 pixel */
rwidth = width + (ylen<0.001?0:max2(0,thickness-1));
rheight = height + (xlen<0.001?0:max2(0,thickness-1));
/* --- set origin corner, x,yinc's: ++=0=(0,0) +-=1=(0,1) -+=10=(1,0) --- */
if ( xinc < 0.0 ) isright = 1; /*negative xinc, so corner is (1,?)*/
if ( yinc < 0.0 ) istop = 1; /*negative yinc, so corner is (?,1)*/
origin = isright*10 + istop; /* interpret 0=(0,0), 11=(1,1), etc*/
if ( msgfp!=NULL && msglevel>=29 ) /* debugging */
fprintf(msgfp,"rastline> width,height,origin;x,yinc=%d,%d,%d;%g,%g\n",
width,height,origin,xinc,yinc);
/* -------------------------------------------------------------------------
allocate subraster and raster for complete picture
-------------------------------------------------------------------------- */
/* --- sanity check on width,height,thickness args --- */
if ( width < 1 || width > 600
|| height < 1 || height > 600
|| thickness<1||thickness>25 ) goto end_of_job;
/* --- allocate and initialize subraster for constructed line --- */
if ( (linesp=new_subraster(rwidth,rheight,pixsz)) /* alloc new subraster */
== NULL ) goto end_of_job; /* quit if failed */
/* --- initialize line subraster parameters --- */
linesp->type = IMAGERASTER; /* image */
linesp->symdef = NULL; /* not applicable for image */
linesp->baseline = height/2 + 2 /* is a little above center good? */
+ (rheight-height)/2; /* account for line thickness too */
linesp->size = size; /* size (probably unneeded) */
/* -------------------------------------------------------------------------
draw the line
-------------------------------------------------------------------------- */
line_raster ( linesp->image, /* embedded raster image */
(istop? 0 : height-1), /* row0, from bottom or top */
(isright? width-1 : 0), /* col0, from left or right */
(istop? height-1 : 0), /* row1, to top or bottom */
(isright? 0 : width-1), /* col1, to right or left */
thickness ); /* line thickness (usually 1 pixel)*/
/* -------------------------------------------------------------------------
return constructed line to caller
-------------------------------------------------------------------------- */
end_of_job:
if ( workingparam != NULL ) /* caller wants origin */
*workingparam = origin; /* return origin corner to caller */
return ( linesp ); /* return line to caller */
} /* --- end-of-function rastline() --- */
/* ==========================================================================
* Function: rastcircle ( expression, size, basesp, arg1, arg2, arg3 )
* Purpose: \circle handler, returns subraster corresponding to ellipse
* parameters (xdiam[,ydiam])
* --------------------------------------------------------------------------
* Arguments: expression (I/O) char ** to first char of null-terminated
* string immediately following \circle to be
* rasterized, and returning ptr immediately
* following last character processed.
* size (I) int containing 0-4 default font size
* basesp (I) subraster * to character (or subexpression)
* immediately preceding \circle
* (unused, but passed for consistency)
* arg1 (I) int unused
* arg2 (I) int unused
* arg3 (I) int unused
* --------------------------------------------------------------------------
* Returns: ( subraster * ) ptr to subraster corresponding to ellipse
* requested, or NULL for any parsing error
* --------------------------------------------------------------------------
* Notes: o Summary of syntax...
* \circle(xdiam[,ydiam])
* o
* ======================================================================= */
/* --- entry point --- */
subraster *rastcircle ( char **expression, int size, subraster *basesp,
int arg1, int arg2, int arg3 )
{
/* -------------------------------------------------------------------------
Allocations and Declarations
-------------------------------------------------------------------------- */
char *texsubexpr(), circexpr[512],*xptr=circexpr; /*circle(xdiam[,ydiam])*/
char *qptr=NULL, quads[256]="1234"; /* default to draw all quadrants */
double theta0=0.0, theta1=0.0; /* ;theta0,theta1 instead of ;quads*/
subraster *new_subraster(), *circsp=NULL; /* subraster for ellipse */
int pixsz = 1; /* pixels are one bit each */
double strtod(), /* convert ascii params to doubles */
xdiam=0.0, ydiam=0.0; /* x,y major/minor axes/diameters */
int width=0, height=0; /* #pixels width,height of ellipse */
int thickness = 1; /* drawn lines are one pixel thick */
int origin = 55; /* force origin centered */
int circle_raster(), /* draw ellipse in circsp->image */
circle_recurse(); /* for theta0,theta1 args */
/* -------------------------------------------------------------------------
obtain (xdiam[,ydiam]) arguments immediately following \circle command
-------------------------------------------------------------------------- */
/* --- parse for (xdiam[,ydiam]) args, and bump expression past it --- */
*expression = texsubexpr(*expression,circexpr,511,"(",")",0,0);
if ( *circexpr == '\000' ) goto end_of_job; /* couldn't get (xdiam[,ydiam])*/
/* --- now interpret xdiam[,ydiam] returned in circexpr --- */
if ( (qptr=strchr(circexpr,';')) != NULL ) /* semicolon signals quads data */
{ *qptr = '\000'; /* replace semicolon by '\0' */
strcpy(quads,qptr+1); /* save user-requested quads */
if ( (qptr=strchr(quads,',')) != NULL ) /* have theta0,theta1 instead */
{ *qptr = '\000'; /* replace , with null */
theta0 = strtod(quads,NULL); /* theta0 precedes , */
theta1 = strtod(qptr+1,NULL); /* theta1 follows , */
qptr = NULL; } /* signal thetas instead of quads */
else
qptr = quads; } /* set qptr arg for circle_raster()*/
else /* no ;quads at all */
qptr = quads; /* default to all 4 quadrants */
if ( (xptr=strchr(circexpr,',')) != NULL ) /* look for ',' in xdiam[,ydiam]*/
*xptr = '\000'; /* found it, so replace ',' by '\0'*/
xdiam = ydiam = strtod(circexpr,NULL); /* xdiam=ydiam in user units */
if ( xptr != NULL ) /* 2nd arg, if present, is ydiam */
ydiam = strtod(xptr+1,NULL); /* in user units */
/* -------------------------------------------------------------------------
calculate width,height, etc
-------------------------------------------------------------------------- */
/* --- calculate width,height in pixels --- */
width = max2(1,iround(unitlength*xdiam)); /*scale by unitlength and round,*/
height = max2(1,iround(unitlength*ydiam)); /* and must be at least 1 pixel */
if ( msgfp!=NULL && msglevel>=29 ) /* debugging */
fprintf(msgfp,"rastcircle> width,height;quads=%d,%d,%s\n",
width,height,(qptr==NULL?"default":qptr));
/* -------------------------------------------------------------------------
allocate subraster and raster for complete picture
-------------------------------------------------------------------------- */
/* --- sanity check on width,height args --- */
if ( width < 1 || width > 600
|| height < 1 || height > 600 ) goto end_of_job;
/* --- allocate and initialize subraster for constructed ellipse --- */
if ( (circsp=new_subraster(width,height,pixsz)) /* allocate new subraster */
== NULL ) goto end_of_job; /* quit if failed */
/* --- initialize ellipse subraster parameters --- */
circsp->type = IMAGERASTER; /* image */
circsp->symdef = NULL; /* not applicable for image */
circsp->baseline = height/2 + 2; /* is a little above center good? */
circsp->size = size; /* size (probably unneeded) */
/* -------------------------------------------------------------------------
draw the ellipse
-------------------------------------------------------------------------- */
if ( qptr != NULL ) /* have quads */
circle_raster ( circsp->image, /* embedded raster image */
0, 0, /* row0,col0 are upper-left corner */
height-1, width-1, /* row1,col1 are lower-right */
thickness, /* line thickness is 1 pixel */
qptr ); /* "1234" quadrants to be drawn */
else /* have theta0,theta1 */
circle_recurse ( circsp->image, /* embedded raster image */
0, 0, /* row0,col0 are upper-left corner */
height-1, width-1, /* row1,col1 are lower-right */
thickness, /* line thickness is 1 pixel */
theta0,theta1 ); /* theta0,theta1 arc to be drawn */
/* -------------------------------------------------------------------------
return constructed ellipse to caller
-------------------------------------------------------------------------- */
end_of_job:
if ( workingparam != NULL ) /* caller wants origin */
*workingparam = origin; /* return center origin to caller */
return ( circsp ); /* return ellipse to caller */
} /* --- end-of-function rastcircle() --- */
/* ==========================================================================
* Function: rastbezier ( expression, size, basesp, arg1, arg2, arg3 )
* Purpose: \bezier handler, returns subraster corresponding to bezier
* parameters (col0,row0)(col1,row1)(colt,rowt)
* --------------------------------------------------------------------------
* Arguments: expression (I/O) char ** to first char of null-terminated
* string immediately following \bezier to be
* rasterized, and returning ptr immediately
* following last character processed.
* size (I) int containing 0-5 default font size
* basesp (I) subraster * to character (or subexpression)
* immediately preceding \bezier
* (unused, but passed for consistency)
* arg1 (I) int unused
* arg2 (I) int unused
* arg3 (I) int unused
* --------------------------------------------------------------------------
* Returns: ( subraster * ) ptr to subraster corresponding to bezier
* requested, or NULL for any parsing error
* --------------------------------------------------------------------------
* Notes: o Summary of syntax...
* \bezier(col1,row1)(colt,rowt)
* o col0=0,row0=0 assumed, i.e., given by
* \picture(){~(col0,row0){\bezier(col1,row1)(colt,rowt)}~}
* ======================================================================= */
/* --- entry point --- */
subraster *rastbezier ( char **expression, int size, subraster *basesp,
int arg1, int arg2, int arg3 )
{
/* -------------------------------------------------------------------------
Allocations and Declarations
-------------------------------------------------------------------------- */
subraster *new_subraster(), *bezsp=NULL; /* subraster for bezier */
char *texsubexpr(), bezexpr[129],*xptr=bezexpr; /*\bezier(r,c)(r,c)(r,c)*/
double strtod(); /* convert ascii params to doubles */
double r0=0.0,c0=0.0, r1=0.0,c1=0.0, rt=0.0,ct=0.0, /* bezier points */
rmid=0.0, cmid=0.0, /* coords at parameterized midpoint*/
rmin=0.0, cmin=0.0, /* minimum r,c */
rmax=0.0, cmax=0.0, /* maximum r,c */
rdelta=0.0, cdelta=0.0, /* rmax-rmin, cmax-cmin */
r=0.0, c=0.0; /* some point */
int iarg=0; /* 0=r0,c0 1=r1,c1 2=rt,ct */
int width=0, height=0; /* dimensions of bezier raster */
int pixsz = 1; /* pixels are one bit each */
/*int thickness = 1;*/ /* drawn lines are one pixel thick */
int origin = 0; /*c's,r's reset to lower-left origin*/
int bezier_raster(); /* draw bezier in bezsp->image */
/* -------------------------------------------------------------------------
obtain (c1,r1)(ct,rt) args immediately following \bezier command
-------------------------------------------------------------------------- */
for ( iarg=1; iarg<=2; iarg++ ) /* 0=c0,r0 1=c1,r1 2=ct,rt */
{
/* --- parse for (r,c) args, and bump expression past them all --- */
*expression = texsubexpr(*expression,bezexpr,127,"(",")",0,0);
if ( *bezexpr == '\000' ) goto end_of_job; /* couldn't get (r,c)*/
/* --- now interpret (r,c) returned in bezexpr --- */
c = r = 0.0; /* init x-coord=col, y-coord=row */
if ( (xptr=strchr(bezexpr,',')) != NULL ) /* comma separates row,col */
{ *xptr = '\000'; /* found it, so replace ',' by '\0'*/
r = unitlength*strtod(xptr+1,NULL); } /* row=y-coord in pixels */
c = unitlength*strtod(bezexpr,NULL); /* col=x-coord in pixels */
/* --- store r,c --- */
switch ( iarg )
{ case 0: r0=r; c0=c; break;
case 1: r1=r; c1=c; break;
case 2: rt=r; ct=c; break; }
} /* --- end-of-for(iarg) --- */
/* --- determine midpoint and maximum,minimum points --- */
rmid = 0.5*(rt + 0.5*(r0+r1)); /* y-coord at middle of bezier */
cmid = 0.5*(ct + 0.5*(c0+c1)); /* x-coord at middle of bezier */
rmin = min3(r0,r1,rmid); /* lowest row */
cmin = min3(c0,c1,cmid); /* leftmost col */
rmax = max3(r0,r1,rmid); /* highest row */
cmax = max3(c0,c1,cmid); /* rightmost col */
rdelta = rmax-rmin; /* height */
cdelta = cmax-cmin; /* width */
/* --- rescale coords so we start at 0,0 --- */
r0 -= rmin; c0 -= cmin; /* rescale r0,c0 */
r1 -= rmin; c1 -= cmin; /* rescale r1,c1 */
rt -= rmin; ct -= cmin; /* rescale rt,ct */
/* --- flip rows so 0,0 becomes lower-left corner instead of upper-left--- */
r0 = rdelta - r0 + 1; /* map 0-->height-1, height-1-->0 */
r1 = rdelta - r1 + 1;
rt = rdelta - rt + 1;
/* --- determine width,height of raster needed for bezier --- */
width = (int)(cdelta + 0.9999) + 1; /* round width up */
height = (int)(rdelta + 0.9999) + 1; /* round height up */
if ( msgfp!=NULL && msglevel>=29 ) /* debugging */
fprintf(msgfp,"rastbezier> width,height,origin=%d,%d,%d; c0,r0=%g,%g; "
"c1,r1=%g,%g\n rmin,mid,max=%g,%g,%g; cmin,mid,max=%g,%g,%g\n",
width,height,origin, c0,r0, c1,r1, rmin,rmid,rmax, cmin,cmid,cmax);
/* -------------------------------------------------------------------------
allocate raster
-------------------------------------------------------------------------- */
/* --- sanity check on width,height args --- */
if ( width < 1 || width > 600
|| height < 1 || height > 600 ) goto end_of_job;
/* --- allocate and initialize subraster for constructed bezier --- */
if ( (bezsp=new_subraster(width,height,pixsz)) /* allocate new subraster */
== NULL ) goto end_of_job; /* quit if failed */
/* --- initialize bezier subraster parameters --- */
bezsp->type = IMAGERASTER; /* image */
bezsp->symdef = NULL; /* not applicable for image */
bezsp->baseline = height/2 + 2; /* is a little above center good? */
bezsp->size = size; /* size (probably unneeded) */
/* -------------------------------------------------------------------------
draw the bezier
-------------------------------------------------------------------------- */
bezier_raster ( bezsp->image, /* embedded raster image */
r0, c0, /* row0,col0 are lower-left corner */
r1, c1, /* row1,col1 are upper-right */
rt, ct ); /* bezier tangent point */
/* -------------------------------------------------------------------------
return constructed bezier to caller
-------------------------------------------------------------------------- */
end_of_job:
if ( workingparam != NULL ) /* caller wants origin */
*workingparam = origin; /* return center origin to caller */
return ( bezsp ); /* return bezier to caller */
} /* --- end-of-function rastbezier() --- */
/* ==========================================================================
* Function: rastraise ( expression, size, basesp, arg1, arg2, arg3 )
* Purpose: \raisebox{lift}{subexpression} handler, returns subraster
* containing subexpression with its baseline "lifted" by lift
* pixels, scaled by \unitlength, or "lowered" if lift arg
* negative
* --------------------------------------------------------------------------
* Arguments: expression (I/O) char ** to first char of null-terminated
* string immediately following \raisebox to be
* rasterized, and returning ptr immediately
* following last character processed.
* size (I) int containing 0-5 default font size
* basesp (I) subraster * to character (or subexpression)
* immediately preceding \rotatebox
* (unused, but passed for consistency)
* arg1 (I) int unused
* arg2 (I) int unused
* arg3 (I) int unused
* --------------------------------------------------------------------------
* Returns: ( subraster * ) ptr to subraster corresponding to \raisebox
* requested, or NULL for any parsing error
* --------------------------------------------------------------------------
* Notes: o Summary of syntax...
* \raisebox{lift}{subexpression}
* o
* ======================================================================= */
/* --- entry point --- */
subraster *rastraise ( char **expression, int size, subraster *basesp,
int arg1, int arg2, int arg3 )
{
/* -------------------------------------------------------------------------
Allocations and Declarations
-------------------------------------------------------------------------- */
char *texsubexpr(), subexpr[8192], *liftexpr=subexpr; /* args */
subraster *rasterize(), *raisesp=NULL; /* rasterize subexpr to be raised */
int lift=0; /* amount to raise/lower baseline */
/* -------------------------------------------------------------------------
obtain {lift} argument immediately following \raisebox command
-------------------------------------------------------------------------- */
/* --- parse for {lift} arg, and bump expression past it --- */
*expression = texsubexpr(*expression,liftexpr,0,"{","}",0,0);
if ( *liftexpr == '\000' ) goto end_of_job; /* couldn't get {lift} */
lift = (int)((unitlength*strtod(liftexpr,NULL))+0.0); /*{lift} to integer*/
if ( abs(lift) > 200 ) lift=0; /* sanity check */
/* -------------------------------------------------------------------------
obtain {subexpr} argument after {lift}, and rasterize it
-------------------------------------------------------------------------- */
/* --- parse for {subexpr} arg, and bump expression past it --- */
*expression = texsubexpr(*expression,subexpr,0,"{","}",0,0);
/* --- rasterize subexpression to be raised/lowered --- */
if ( (raisesp = rasterize(subexpr,size)) /* rasterize subexpression */
== NULL ) goto end_of_job; /* and quit if failed */
/* -------------------------------------------------------------------------
raise/lower baseline and return it to caller
-------------------------------------------------------------------------- */
/* --- raise/lower baseline --- */
raisesp->baseline += lift; /* new baseline (no height checks) */
/* --- return raised subexpr to caller --- */
end_of_job:
return ( raisesp ); /* return raised subexpr to caller */
} /* --- end-of-function rastraise() --- */
/* ==========================================================================
* Function: rastrotate ( expression, size, basesp, arg1, arg2, arg3 )
* Purpose: \rotatebox{degrees}{subexpression} handler, returns subraster
* containing subexpression rotated by degrees (counterclockwise
* if degrees positive)
* --------------------------------------------------------------------------
* Arguments: expression (I/O) char ** to first char of null-terminated
* string immediately following \rotatebox to be
* rasterized, and returning ptr immediately
* following last character processed.
* size (I) int containing 0-5 default font size
* basesp (I) subraster * to character (or subexpression)
* immediately preceding \rotatebox
* (unused, but passed for consistency)
* arg1 (I) int unused
* arg2 (I) int unused
* arg3 (I) int unused
* --------------------------------------------------------------------------
* Returns: ( subraster * ) ptr to subraster corresponding to \rotatebox
* requested, or NULL for any parsing error
* --------------------------------------------------------------------------
* Notes: o Summary of syntax...
* \rotatebox{degrees}{subexpression}
* o
* ======================================================================= */
/* --- entry point --- */
subraster *rastrotate ( char **expression, int size, subraster *basesp,
int arg1, int arg2, int arg3 )
{
/* -------------------------------------------------------------------------
Allocations and Declarations
-------------------------------------------------------------------------- */
char *texsubexpr(), subexpr[8192], *degexpr=subexpr; /* args */
subraster *rasterize(), *rotsp=NULL; /* subraster for rotated subexpr */
raster *rastrot(), *rotrp=NULL; /* rotate subraster->image 90 degs */
int delete_raster(); /* delete intermediate rasters */
int baseline=0; /* baseline of rasterized image */
double strtod(), /* convert ascii params to doubles */
degrees=0.0, ipart,fpart; /* degrees to be rotated */
int idegrees=0, isneg=0; /* positive ipart, isneg=1 if neg */
int n90=0, isn90=1; /* degrees is n90 multiples of 90 */
/* -------------------------------------------------------------------------
obtain {degrees} argument immediately following \rotatebox command
-------------------------------------------------------------------------- */
/* --- parse for {degrees} arg, and bump expression past it --- */
*expression = texsubexpr(*expression,degexpr,0,"{","}",0,0);
if ( *degexpr == '\000' ) goto end_of_job; /* couldn't get {degrees} */
degrees = strtod(degexpr,NULL); /* degrees to be rotated */
if ( degrees < 0.0 ) /* clockwise rotation desired */
{ degrees = -degrees; /* flip sign so degrees positive */
isneg = 1; } /* and set flag to indicate flip */
fpart = modf(degrees,&ipart); /* integer and fractional parts */
ipart = (double)(((int)degrees)%360); /* degrees mod 360 */
degrees = ipart + fpart; /* restore fractional part */
if ( isneg ) /* if clockwise rotation requested */
degrees = 360.0 - degrees; /* do equivalent counterclockwise */
idegrees = (int)(degrees+0.5); /* integer degrees */
n90 = idegrees/90; /* degrees is n90 multiples of 90 */
isn90 = (90*n90==idegrees); /*true if degrees is multiple of 90*/
isn90 = 1; /* forced true for time being */
/* -------------------------------------------------------------------------
obtain {subexpr} argument after {degrees}, and rasterize it
-------------------------------------------------------------------------- */
/* --- parse for {subexpr} arg, and bump expression past it --- */
*expression = texsubexpr(*expression,subexpr,0,"{","}",0,0);
/* --- rasterize subexpression to be rotated --- */
if ( (rotsp = rasterize(subexpr,size)) /* rasterize subexpression */
== NULL ) goto end_of_job; /* and quit if failed */
/* --- return unmodified image if no rotation requested --- */
if ( abs(idegrees) < 2 ) goto end_of_job; /* don't bother rotating image */
/* --- extract params for image to be rotated --- */
rotrp = rotsp->image; /* unrotated rasterized image */
baseline = rotsp->baseline; /* and baseline of that image */
/* -------------------------------------------------------------------------
rotate by multiples of 90 degrees
-------------------------------------------------------------------------- */
if ( isn90 ) /* rotation by multiples of 90 */
if ( n90 > 0 ) /* do nothing for 0 degrees */
{
n90 = 4-n90; /* rasrot() rotates clockwise */
while ( n90 > 0 ) /* still have remaining rotations */
{ raster *nextrp = rastrot(rotrp); /* rotate raster image */
if ( nextrp == NULL ) break; /* something's terribly wrong */
delete_raster(rotrp); /* free previous raster image */
rotrp = nextrp; /* and replace it with rotated one */
n90--; } /* decrement remaining count */
} /* --- end-of-if(isn90) --- */
/* -------------------------------------------------------------------------
requested rotation not multiple of 90 degrees
-------------------------------------------------------------------------- */
if ( !isn90 ) /* explicitly construct rotation */
{ ; } /* not yet implemented */
/* -------------------------------------------------------------------------
re-populate subraster envelope with rotated image
-------------------------------------------------------------------------- */
/* --- re-init various subraster parameters, embedding raster in it --- */
if ( rotrp != NULL ) /* rotated raster constructed okay */
{ rotsp->type = IMAGERASTER; /* signal constructed image */
rotsp->image = rotrp; /* raster we just constructed */
/* --- now try to guess pleasing baseline --- */
if ( idegrees > 2 ) /* leave unchanged if unrotated */
if ( strlen(subexpr) < 3 /* we rotated a short expression */
|| abs(idegrees-180) < 3 ) /* or just turned it upside-down */
baseline = rotrp->height - 1; /* so set with nothing descending */
else /* rotated a long expression */
baseline = (65*(rotrp->height-1))/100; /* roughly center long expr */
rotsp->baseline = baseline; } /* set baseline as calculated above*/
/* --- return rotated subexpr to caller --- */
end_of_job:
return ( rotsp ); /*return rotated subexpr to caller*/
} /* --- end-of-function rastrotate() --- */
/* ==========================================================================
* Function: rastfbox ( expression, size, basesp, arg1, arg2, arg3 )
* Purpose: \fbox{subexpression} handler, returns subraster
* containing subexpression with frame box drawn around it
* --------------------------------------------------------------------------
* Arguments: expression (I/O) char ** to first char of null-terminated
* string immediately following \fbox to be
* rasterized, and returning ptr immediately
* following last character processed.
* size (I) int containing 0-5 default font size
* basesp (I) subraster * to character (or subexpression)
* immediately preceding \fbox
* (unused, but passed for consistency)
* arg1 (I) int unused
* arg2 (I) int unused
* arg3 (I) int unused
* --------------------------------------------------------------------------
* Returns: ( subraster * ) ptr to subraster corresponding to \fbox
* requested, or NULL for any parsing error
* --------------------------------------------------------------------------
* Notes: o Summary of syntax...
* \fbox[width][height]{subexpression}
* o
* ======================================================================= */
/* --- entry point --- */
subraster *rastfbox ( char **expression, int size, subraster *basesp,
int arg1, int arg2, int arg3 )
{
/* -------------------------------------------------------------------------
Allocations and Declarations
-------------------------------------------------------------------------- */
char *texsubexpr(), subexpr[8192], widtharg[512]; /* args */
subraster *rasterize(), *framesp=NULL; /* rasterize subexpr to be framed */
raster *border_raster(), *bp=NULL; /* framed image raster */
double strtod(); /* interpret [width][height] */
int fwidth=6, fthick=1; /*extra frame width, line thickness*/
int width=(-1), height=(-1), /* optional [width][height] args */
iscompose = 0; /* set true if optional args given */
/* -------------------------------------------------------------------------
obtain optional [width][height] arguments immediately following \fbox
-------------------------------------------------------------------------- */
/* --- first check for optional \fbox[width] --- */
if ( *(*expression) == '[' ) /* check for []-enclosed width arg */
{ *expression = texsubexpr(*expression,widtharg,511,"[","]",0,0);
if ( *widtharg != '\000' ) /* got widtharg */
{ width = max2(1,iround(unitlength*strtod(widtharg,NULL)));
height = 1; fwidth = 2; iscompose = 1; }
} /* --- end-of-if(**expression=='[') --- */
if ( width > 0 ) /* found leading [width], so... */
if ( *(*expression) == '[' ) /* check for []-enclosed height arg */
{ *expression = texsubexpr(*expression,widtharg,511,"[","]",0,0);
if ( *widtharg != '\000' ) /* got widtharg */
{ height = max2(1,iround(unitlength*strtod(widtharg,NULL)));
fwidth = 0; } /* no extra border */
} /* --- end-of-if(**expression=='[') --- */
/* -------------------------------------------------------------------------
obtain {subexpr} argument
-------------------------------------------------------------------------- */
/* --- parse for {subexpr} arg, and bump expression past it --- */
*expression = texsubexpr(*expression,subexpr,0,"{","}",0,0);
/* --- rasterize subexpression to be framed --- */
if ( width<0 || height<0 ) /* no explicit dimensions given */
{ if ( (framesp = rasterize(subexpr,size)) /* rasterize subexpression */
== NULL ) goto end_of_job; } /* and quit if failed */
else
{ char composexpr[8192]; /* compose subexpr with empty box */
sprintf(composexpr,"\\compose{\\hspace{%d}\\vspace{%d}}{%s}",
width,height,subexpr);
if ( (framesp = rasterize(composexpr,size)) /* rasterize subexpression */
== NULL ) goto end_of_job; } /* and quit if failed */
/* -------------------------------------------------------------------------
draw frame, reset params, and return it to caller
-------------------------------------------------------------------------- */
/* --- draw border --- */
if ( (bp = border_raster(framesp->image,-fwidth,-fwidth,fthick,1))
== NULL ) goto end_of_job; /* draw border and quit if failed */
/* --- replace original image and raise baseline to accommodate frame --- */
framesp->image = bp; /* replace image with framed one */
if ( !iscompose ) /* simple border around subexpr */
framesp->baseline += fwidth; /* so just raise baseline */
else
framesp->baseline = (framesp->image)->height - 1; /* set at bottom */
/* --- return framed subexpr to caller --- */
end_of_job:
return ( framesp ); /* return framed subexpr to caller */
} /* --- end-of-function rastfbox() --- */
/* ==========================================================================
* Function: rastinput ( expression, size, basesp, arg1, arg2, arg3 )
* Purpose: \input{filename} handler, reads filename and returns
* subraster containing image of expression read from filename
* --------------------------------------------------------------------------
* Arguments: expression (I/O) char ** to first char of null-terminated
* string immediately following \input to be
* rasterized, and returning ptr immediately
* following last character processed.
* size (I) int containing 0-5 default font size
* basesp (I) subraster * to character (or subexpression)
* immediately preceding \input
* (unused, but passed for consistency)
* arg1 (I) int unused
* arg2 (I) int unused
* arg3 (I) int unused
* --------------------------------------------------------------------------
* Returns: ( subraster * ) ptr to subraster corresponding to expression
* in filename, or NULL for any parsing error
* --------------------------------------------------------------------------
* Notes: o Summary of syntax...
* \input{filename}
* o
* ======================================================================= */
/* --- entry point --- */
subraster *rastinput ( char **expression, int size, subraster *basesp,
int arg1, int arg2, int arg3 )
{
/* -------------------------------------------------------------------------
Allocations and Declarations
-------------------------------------------------------------------------- */
char *texsubexpr(), tag[512]="\000", filename[1024]="\000"; /* args */
subraster *rasterize(), *inputsp=NULL; /* rasterized input image */
int status, rastreadfile(); /* read input file */
int format=0, npts=0; /* don't reformat (numerical) input */
char subexpr[8192] = "\000", /* concatanated lines from input file */
*mimeprep(), /* preprocess inputted data */
*dbltoa(), *reformat=NULL; /* reformat numerical input */
/* -------------------------------------------------------------------------
obtain [tag]{filename} argument
-------------------------------------------------------------------------- */
/* --- parse for optional [tag] or [fmt] arg, bump expression past it --- */
if ( *(*expression) == '[' ) /* check for []-enclosed value */
{ char argfld[2048]; /* optional argument field */
*expression = texsubexpr(*expression,argfld,2047,"[","]",0,0);
if ( (reformat=strstr(argfld,"dtoa")) != NULL ) /*dtoa/dbltoa requested*/
{ format = 1; /* signal dtoa()/dbltoa() format */
if ( (reformat=strchr(reformat,'=')) != NULL ) /* have dtoa= */
npts = (int)strtol(reformat+1,NULL,0); } /* so set npts */
if ( format == 0 ) /* reformat not requested */
strcpy(tag,argfld); } /* so interpret arg as tag */
/* --- parse for {filename} arg, and bump expression past it --- */
*expression = texsubexpr(*expression,filename,1023,"{","}",0,0);
/* --- check for alternate filename:tag --- */
if ( *filename != '\000' /* got filename */
/*&& *tag == '\000'*/ ) /* but no [tag] */
{ char *delim = strchr(filename,':'); /* look for : in filename:tag */
if ( delim != (char *)NULL ) /* found it */
{ *delim = '\000'; /* null-terminate filename at : */
strcpy(tag,delim+1); } } /* and stuff after : is tag */
/* --------------------------------------------------------------------------
Read file and rasterize constructed subexpression
-------------------------------------------------------------------------- */
status = rastreadfile(filename,0,tag,subexpr); /* read file */
if ( *subexpr == '\000' ) goto end_of_job; /* quit if problem */
/* --- rasterize input subexpression --- */
mimeprep(subexpr); /* preprocess subexpression */
if ( format == 1 ) /* dtoa()/dbltoa() */
{ double d = strtod(subexpr,NULL); /* interpret subexpr as double */
if ( d != 0.0 ) /* conversion to double successful */
if ( (reformat=dbltoa(d,npts)) != NULL ) /* reformat successful */
strcpy(subexpr,reformat); } /*replace subexpr with reformatted*/
inputsp = rasterize(subexpr,size); /* rasterize subexpression */
/* --- return input image to caller --- */
end_of_job:
return ( inputsp ); /* return input image to caller */
} /* --- end-of-function rastinput() --- */
/* ==========================================================================
* Function: rastcounter ( expression, size, basesp, arg1, arg2, arg3 )
* Purpose: \counter[value]{filename} handler, returns subraster
* containing image of counter value read from filename
* (or optional [value]), and increments counter
* --------------------------------------------------------------------------
* Arguments: expression (I/O) char ** to first char of null-terminated
* string immediately following \counter to be
* rasterized, and returning ptr immediately
* following last character processed.
* size (I) int containing 0-5 default font size
* basesp (I) subraster * to character (or subexpression)
* immediately preceding \counter
* (unused, but passed for consistency)
* arg1 (I) int unused
* arg2 (I) int unused
* arg3 (I) int unused
* --------------------------------------------------------------------------
* Returns: ( subraster * ) ptr to subraster corresponding to \counter
* requested, or NULL for any parsing error
* --------------------------------------------------------------------------
* Notes: o Summary of syntax...
* \counter[value][logfile]{filename:tag}
* o :tag is optional
* ======================================================================= */
/* --- entry point --- */
subraster *rastcounter ( char **expression, int size, subraster *basesp,
int arg1, int arg2, int arg3 )
{
/* -------------------------------------------------------------------------
Allocations and Declarations
-------------------------------------------------------------------------- */
char *texsubexpr(), filename[1024]="\000", /* counter file */
logfile[1024]="\000", tag[512]="\000"; /*optional log file and tag*/
subraster *rasterize(), *countersp=NULL; /* rasterized counter image */
FILE /* *fp=NULL,*/ *logfp=NULL; /* counter and log file pointers */
int status=0,rastreadfile(),rastwritefile(), /*read,write counter file*/
isstrict = 1; /* true to only write to existing files */
char text[8192] = "1_", /* only line in counter file without tags */
*delim = NULL, /* delimiter in text */
utext[128] = "1_", /* default delimiter */
*udelim = utext+1; /* underscore delimiter */
char *rasteditfilename(), /* edit log file name */
*timestamp(), /* timestamp for logging */
*dbltoa(); /* double to comma-separated ascii */
int counter = 1, /* atoi(text) (after _ removed, if present) */
value = 1, /* optional [value] argument */
gotvalue = 0, /* set true if [value] supplied */
isdelta = 0, /* set true if [+value] or [-value] is delta*/
ordindex = (-1); /* ordinal[] index to append ordinal suffix */
/*--- ordinal suffixes based on units digit of counter ---*/
static char *ordinal[]={"th","st","nd","rd","th","th","th","th","th","th"};
static char *logvars[]={"REMOTE_ADDR","HTTP_REFERER",NULL}; /* log vars*/
static int commentvar = 1; /* logvars[commentvar] replaced by comment */
/* -------------------------------------------------------------------------
first obtain optional [value][logfile] args immediately following \counter
-------------------------------------------------------------------------- */
/* --- first check for optional \counter[value] --- */
if ( *(*expression) == '[' ) /* check for []-enclosed value */
{ *expression = texsubexpr(*expression,text,1023,"[","]",0,0);
if ( *text != '\000' ) /* got counter value (or logfile) */
if ( strlen(text) >= 1 ) /* and it's not an empty string */
if ( isthischar(*text,"+-0123456789") ) /* check for leading +-digit */
gotvalue = 1; /* signal we got optional value */
else /* not +-digit, so must be logfile */
strcpy(logfile,text); /* so just copy it */
} /* --- end-of-if(**expression=='[') --- */
/* --- next check for optional \counter[][logfile] --- */
if ( *(*expression) == '[' ) /* check for []-enclosed logfile */
{ *expression = texsubexpr(*expression,filename,1023,"[","]",0,0);
if ( *filename != '\000' ) /* got logfile (or counter value) */
if ( strlen(filename) >= 1 ) /* and it's not an empty string */
if ( !(isthischar(*text,"+-0123456789")) /* not a leading +-digit */
|| gotvalue ) /* or we already got counter value */
strcpy(logfile,filename); /* so just copy it */
else /* leading +-digit must be value */
{ strcpy(text,filename); /* copy value to text line */
gotvalue = 1; } /* and signal we got optional value*/
} /* --- end-of-if(**expression=='[') --- */
/* --- evaluate [value] if present --- */
if ( gotvalue ) { /*leading +-digit should be in text*/
if ( *text == '+' ) isdelta = (+1); /* signal adding */
if ( *text == '-' ) isdelta = (-1); /* signal subtracting */
value = (int)(strtod((isdelta==0?text:text+1),&udelim)+0.1); /*abs(value)*/
if ( isdelta == (-1) ) value = (-value); /* set negative value if needed */
counter = value; /* re-init counter */
} /* --- end-of-if(gotvalue) --- */
/* -------------------------------------------------------------------------
obtain counter {filename} argument
-------------------------------------------------------------------------- */
/* --- parse for {filename} arg, and bump expression past it --- */
*expression = texsubexpr(*expression,filename,1023,"{","}",0,0);
/* --- check for counter filename:tag --- */
if ( *filename != '\000' ) /* got filename */
if ( (delim=strchr(filename,':')) /* look for : in filename:tag */
!= (char *)NULL ) /* found it */
{ *delim = '\000'; /* null-terminate filename at : */
strcpy(tag,delim+1); } /* and stuff after : is tag */
/* --------------------------------------------------------------------------
Read and parse file, increment and rewrite counter (with optional underscore)
-------------------------------------------------------------------------- */
if ( strlen(filename) > 1 ) /* make sure we got {filename} arg */
{
/* --- read and interpret first (and only) line from counter file --- */
if ( !gotvalue || (isdelta!=0) ) /*if no [count] arg or if delta arg*/
if ( (status=rastreadfile(filename,1,tag,text)) > 0 ) /*try reading file*/
{ char *vdelim = NULL; /* underscore delim from file */
double fileval = strtod(text,&vdelim); /* value and delim from file */
counter = (int)(fileval<0.0?fileval-0.1:fileval+0.1); /* integerized */
counter += value; /* bump count by 1 or add/sub delta*/
if ( !gotvalue ) udelim=vdelim; } /* default to file's current delim */
/* --- check for ordinal suffix --- */
if ( udelim != (char *)NULL ) /* have some delim after value */
if ( *udelim == '_' ) /* underscore signals ordinal */
{ int abscount = (counter>=0?counter:(-counter)); /* abs(counter) */
ordindex = abscount%10; /* least significant digit */
if ( abscount >= 10 ) /* counter is 10 or greater */
if ( (abscount/10)%10 == 1 ) /* and the last two are 10-19 */
ordindex = 0; } /* use th for 11,12,13 rather than st,nd,rd */
/* --- rewrite counter file --- */
if ( status >= 0 ) /* file was read okay */
{ sprintf(text,"%d",counter); /*build image of incremented counter*/
if ( ordindex >= 0 ) strcat(text,"_"); /* tack on _ */
if ( *tag == '\000' ) strcat(text,"\n"); /* and newline */
status = rastwritefile(filename,tag,text,isstrict); } /*rewrite counter*/
} /* --- end-of-if(strlen(filename)>1) --- */
/* --------------------------------------------------------------------------
log counter request
-------------------------------------------------------------------------- */
if ( strlen(logfile) > 1 ) /* optional [logfile] given */
{
char comment[1024] = "\000", /* embedded comment, logfile:comment*/
*commptr = strchr(logfile,':'); /* check for : signalling comment */
int islogokay = 1; /* logfile must exist if isstrict */
if ( commptr != NULL ) /* have embedded comment */
{ strcpy(comment,commptr+1); /* comment follows : */
*commptr = '\000'; } /* null-terminate actual logfile */
strcpy(logfile,rasteditfilename(logfile)); /* edit log file name */
if ( *logfile == '\000' ) islogokay = 0; /* given an invalid file name */
else if ( isstrict ) { /*okay, but only write if it exists*/
if ( (logfp=fopen(logfile,"r")) == (FILE *)NULL ) /*doesn't already exist*/
islogokay = 0; /* so don't write log file */
else fclose(logfp); } /* close file opened for test read */
if ( islogokay ) /* okay to write logfile */
if ( (logfp = fopen(logfile,"a")) /* open logfile */
!= (FILE *)NULL ) { /* opened successfully for append */
int ilog=0; /* logvars[] index */
fprintf(logfp,"%s ",timestamp(TZDELTA,0)); /* first emit timestamp */
if (*tag=='\000') fprintf(logfp,"%s",filename); /* emit counter filename */
else fprintf(logfp,"<%s>",tag); /* or tag if we have one */
fprintf(logfp,"=%d",counter); /* emit counter value */
if ( status < 1 ) /* read or re-write failed */
fprintf(logfp,"(%s %d)","error status",status); /* emit error */
for ( ilog=0; logvars[ilog] != NULL; ilog++ ) /* log till end-of-table */
if ( ilog == commentvar /* replace with comment... */
&& commptr != NULL ) /* ...if available */
fprintf(logfp," %.256s",comment); /* log embedded comment */
else
{ char *logval = getenv(logvars[ilog]); /*getenv(variable) to be logged*/
fprintf(logfp," %.64s", /* log variable */
(logval!=NULL?logval:"<unknown>")); } /* emit value or <unknown> */
fprintf(logfp,"\n"); /* terminating newline */
fclose(logfp); /* close logfile */
} /* --- end-of-if(islogokay&&logfp!=NULL) --- */
} /* --- end-of-if(strlen(logfile)>1) --- */
/* --------------------------------------------------------------------------
construct counter expression and rasterize it
-------------------------------------------------------------------------- */
/* --- construct expression --- */
/*sprintf(text,"%d",counter);*/ /* start with counter */
strcpy(text,dbltoa(((double)counter),0)); /* comma-separated counter value */
if ( ordindex >= 0 ) /* need to tack on ordinal suffix */
{ strcat(text,"^{\\underline{\\rm~"); /* start with ^ and {\underline{\rm */
strcat(text,ordinal[ordindex]); /* then st,nd,rd, or th */
strcat(text,"}}"); } /* finish with }} */
/* --- rasterize it --- */
countersp = rasterize(text,size); /* rasterize counter subexpression */
/* --- return counter image to caller --- */
/*end_of_job:*/
return ( countersp ); /* return counter image to caller */
} /* --- end-of-function rastcounter() --- */
/* ==========================================================================
* Function: rasttoday ( expression, size, basesp, arg1, arg2, arg3 )
* Purpose: handle \today
* --------------------------------------------------------------------------
* Arguments: expression (I/O) char ** to first char of null-terminated
* string immediately following \today,
* and returning ptr immediately
* following last character processed.
* size (I) int containing 0-5 default font size
* basesp (I) subraster * to character (or subexpression)
* immediately preceding \today
* (unused, but passed for consistency)
* arg1 (I) int unused
* arg2 (I) int unused
* arg3 (I) int unused
* --------------------------------------------------------------------------
* Returns: ( subraster * ) subraster ptr to date stamp
* --------------------------------------------------------------------------
* Notes: o
* ======================================================================= */
/* --- entry point --- */
subraster *rasttoday ( char **expression, int size, subraster *basesp,
int arg1, int arg2, int arg3 )
{
/* -------------------------------------------------------------------------
Allocations and Declarations
-------------------------------------------------------------------------- */
char *texsubexpr(), optarg[2050]; /* optional [+/-tzdelta,ifmt] args */
char *timestamp(), *today=optarg; /* timestamp to be rasterized */
subraster *rasterize(), *todaysp=NULL; /* rasterize timestamp */
int ifmt=1, tzdelta=0; /* default timestamp() args */
/* -------------------------------------------------------------------------
Get optional args \today[+/-tzdelta,ifmt]
-------------------------------------------------------------------------- */
/* --- check for optional \today[+/-tzdelta,ifmt] --- */
if ( *(*expression) == '[' ) /* check for []-enclosed value */
{ *expression = texsubexpr(*expression,optarg,2047,"[","]",0,0);
if ( *optarg != '\000' ) /* got optional arg */
{ char *comma = strchr(optarg,','); /* comma between +/-tzdelta,ifmt */
int iarg, nargs=(comma==NULL?1:2); /* #optional args between []'s */
if ( comma != NULL ) *comma = '\000'; /* null-terminate first arg */
for ( iarg=1; iarg<=nargs; iarg++ ) /* process one or both args */
{ char *arg = (iarg==1?optarg:comma+1); /* choose 1st or 2nd arg */
if ( isthischar(*arg,"+-") ) /* leading +/- signals tzdelta */
tzdelta = atoi(arg); /* so interpret arg as tzdelta */
else ifmt = atoi(arg); } /* else interpret args as ifmt */
} /* --- end-of-if(*optarg!='\0') --- */
} /* --- end-of-if(**expression=='[') --- */
/* -------------------------------------------------------------------------
Get timestamp and rasterize it
-------------------------------------------------------------------------- */
strcpy(today,"\\text{"); /* rasterize timestamp as text */
strcat(today,timestamp(tzdelta,ifmt)); /* get timestamp */
strcat(today,"}"); /* terminate \text{} braces */
todaysp = rasterize(today,size); /* rasterize timestamp */
/* --- return timestamp raster to caller --- */
/*end_of_job:*/
return ( todaysp ); /* return timestamp to caller */
} /* --- end-of-function rasttoday() --- */
/* ==========================================================================
* Function: rastcalendar ( expression, size, basesp, arg1, arg2, arg3 )
* Purpose: handle \calendar
* --------------------------------------------------------------------------
* Arguments: expression (I/O) char ** to first char of null-terminated
* string immediately following \calendar
* and returning ptr immediately
* following last character processed.
* size (I) int containing 0-5 default font size
* basesp (I) subraster * to character (or subexpression)
* immediately preceding \calendar
* (unused, but passed for consistency)
* arg1 (I) int unused
* arg2 (I) int unused
* arg3 (I) int unused
* --------------------------------------------------------------------------
* Returns: ( subraster * ) subraster ptr to rendered one-month calendar
* --------------------------------------------------------------------------
* Notes: o
* ======================================================================= */
/* --- entry point --- */
subraster *rastcalendar ( char **expression, int size, subraster *basesp,
int arg1, int arg2, int arg3 )
{
/* -------------------------------------------------------------------------
Allocations and Declarations
-------------------------------------------------------------------------- */
char *texsubexpr(), optarg[2050]; /* optional [year,month] args */
char *calendar(), *calstr=NULL; /* calendar to be rasterized */
subraster *rasterize(), *calendarsp=NULL; /* rasterize calendar string */
int year=0,month=0,day=0, argval=0; /* default calendar() args */
/* -------------------------------------------------------------------------
Get optional args \today[+/-tzdelta,ifmt]
-------------------------------------------------------------------------- */
/* --- check for optional \calendar[year,month] --- */
if ( *(*expression) == '[' ) /* check for []-enclosed value */
{ *expression = texsubexpr(*expression,optarg,2047,"[","]",0,0);
if ( *optarg != '\000' ) /* got optional arg */
{ char *comma = strchr(optarg,','), /* comma between year,month */
*comma2 = NULL; /* second comma before day */
int iarg, nargs=(comma==NULL?1:2); /* #optional args between []'s */
if ( comma != NULL ) { *comma = '\000'; /*null-terminate first arg*/
if ( (comma2=strchr(comma+1,',')) != NULL ) /* have third arg */
{ *comma2 = '\000'; nargs++; } } /* null-term 2nd arg, bump count */
for ( iarg=1; iarg<=nargs; iarg++ ) /* process one or both args */
{ char *arg= (iarg==1?optarg:(iarg==2?comma+1:comma2+1)); /*get arg*/
argval = atoi(arg); /* interpret arg as integer */
if ( iarg < 3 ) /* first two args are month,year */
{if ( argval>1972 && argval<2100 ) year = argval; /* year value */
else if ( argval>=1 && argval<=12 ) month = argval;} /*or month*/
else /* only 3rd arg can be day */
if ( argval>=1 && argval<=31 ) day = argval; } /* day value */
} /* --- end-of-if(*optarg!='\0') --- */
} /* --- end-of-if(**expression=='[') --- */
/* -------------------------------------------------------------------------
Get calendar string and rasterize it
-------------------------------------------------------------------------- */
if ( msgfp!= NULL && msglevel>=9 )
fprintf(msgfp,"rastcalendar> year=%d, month=%d, day=%d\n",
year,month,day);
calstr = calendar(year,month,day); /* get calendar string */
calendarsp = rasterize(calstr,size); /* rasterize calendar string */
/* --- return calendar raster to caller --- */
/*end_of_job:*/
return ( calendarsp ); /* return calendar to caller */
} /* --- end-of-function rastcalendar() --- */
/* ==========================================================================
* Function: rastnoop ( expression, size, basesp, nargs, arg2, arg3 )
* Purpose: no op -- flush \escape without error
* --------------------------------------------------------------------------
* Arguments: expression (I/O) char ** to first char of null-terminated
* string immediately following \escape to be
* flushed, and returning ptr immediately
* following last character processed.
* size (I) int containing 0-5 default font size
* basesp (I) subraster * to character (or subexpression)
* immediately preceding \escape
* (unused, but passed for consistency)
* nargs (I) int containing number of {}-args after
* \escape to be flushed along with it
* arg2 (I) int unused
* arg3 (I) int unused
* --------------------------------------------------------------------------
* Returns: ( subraster * ) NULL subraster ptr
* --------------------------------------------------------------------------
* Notes: o
* ======================================================================= */
/* --- entry point --- */
subraster *rastnoop ( char **expression, int size, subraster *basesp,
int nargs, int arg2, int arg3 )
{
/* -------------------------------------------------------------------------
Allocations and Declarations
-------------------------------------------------------------------------- */
char *texsubexpr(), subexpr[8192]; /* flush dummy args eaten by \escape*/
subraster *rasterize(), *noopsp=NULL; /* rasterize subexpr */
/* --- flush accompanying args if necessary --- */
if ( nargs != NOVALUE /* not unspecified */
&& nargs > 0 ) /* and args to be flushed */
while ( --nargs >= 0 ) /* count down */
*expression = texsubexpr(*expression,subexpr,0,"{","}",0,0); /*flush arg*/
/* --- return null ptr to caller --- */
/*end_of_job:*/
return ( noopsp ); /* return NULL ptr to caller */
} /* --- end-of-function rastnoop() --- */
/* ==========================================================================
* Function: rastopenfile ( filename, mode )
* Purpose: Opens filename[.tex] in mode, returning FILE *
* --------------------------------------------------------------------------
* Arguments: filename (I/O) char * to null-terminated string containing
* name of file to open (preceded by path
* relative to mimetex executable)
* If fopen() fails, .tex appeneded,
* and returned if that fopen() succeeds
* mode (I) char * to null-terminated string containing
* fopen() mode
* --------------------------------------------------------------------------
* Returns: ( FILE * ) pointer to opened file, or NULL if error
* --------------------------------------------------------------------------
* Notes: o
* ======================================================================= */
/* --- entry point --- */
FILE *rastopenfile ( char *filename, char *mode )
{
/* -------------------------------------------------------------------------
Allocations and Declarations
-------------------------------------------------------------------------- */
FILE *fp = (FILE *)NULL /*,*fopen()*/; /*file pointer to opened filename*/
char texfile[2048] = "\000", /* local, edited copy of filename */
*rasteditfilename(), /* prepend pathprefix if necessary */
amode[128] = "r"; /* test open mode if arg mode=NULL */
int ismode = 0; /* true of mode!=NULL */
/* --------------------------------------------------------------------------
Check mode and open file
-------------------------------------------------------------------------- */
/* --- edit filename --- */
strcpy(texfile,rasteditfilename(filename)); /*edited copy of input filename*/
/* --- check mode --- */
if ( mode != (char *)NULL ) /* caller passed mode arg */
if ( *mode != '\000' ) /* and it's not an empty string */
{ ismode = 1; /* so flip mode flag true */
strcpy(amode,mode); /* and replace "r" with caller's */
compress(amode,' '); } /* remove embedded blanks */
/* --- open filename or filename.tex --- */
if ( strlen(texfile) > 1 ) /* make sure we got actual filename*/
if ( (fp = fopen(texfile,amode)) /* try opening given filename */
== NULL ) /* failed to open given filename */
{ strcpy(filename,texfile); /* signal possible filename error */
strcat(texfile,".tex"); /* but first try adding .tex */
if ( (fp = fopen(texfile,amode)) /* now try opening filename.tex */
!= NULL ) /* filename.tex succeeded */
strcpy(filename,texfile); } /* replace caller's filename */
/* --- close file if only opened to check name --- */
if ( !ismode && fp!=NULL ) /* no mode, so just checking */
fclose(fp); /* close file, fp signals success */
/* --- return fp or NULL to caller --- */
/*end_of_job:*/
if ( msglevel>=9 && msgfp!=NULL ) /* debuging */
{ fprintf(msgfp,"rastopenfile> returning fopen(%s,%s) = %s\n",
filename,amode,(fp==NULL?"NULL":"Okay")); fflush(msgfp); }
return ( fp ); /* return fp or NULL to caller */
} /* --- end-of-function rastopenfile() --- */
/* ==========================================================================
* Function: rasteditfilename ( filename )
* Purpose: edits filename to remove security problems,
* e.g., removes all ../'s and ..\'s.
* --------------------------------------------------------------------------
* Arguments: filename (I) char * to null-terminated string containing
* name of file to be edited
* --------------------------------------------------------------------------
* Returns: ( char * ) pointer to edited filename,
* or empty string "\000" if any problem
* --------------------------------------------------------------------------
* Notes: o
* ======================================================================= */
/* --- entry point --- */
char *rasteditfilename ( char *filename )
{
/* -------------------------------------------------------------------------
Allocations and Declarations
-------------------------------------------------------------------------- */
static char editname[2048]; /*edited filename returned to caller*/
char *strchange(); /* prepend pathprefix if necessary */
int strreplace(), /* remove ../'s and ..\'s */
isprefix = (*pathprefix=='\000'?0:1); /* true if paths have prefix */
/* --------------------------------------------------------------------------
edit filename
-------------------------------------------------------------------------- */
/* --- first check filename arg --- */
*editname = '\000'; /* init edited name as empty string*/
if ( filename == (char *)NULL ) goto end_of_job; /* no filename arg */
if ( *filename == '\000' ) goto end_of_job; /* filename is an empty string */
/* --- init edited filename --- */
strcpy(editname,filename); /* init edited name as input name */
compress(editname,' '); /* remove embedded blanks */
/* --- remove leading or embedded ....'s --- */
while ( strreplace(editname,"....",NULL,0) > 0 ) ; /* squeeze out ....'s */
/* --- remove leading / and \ and dots (and blanks) --- */
if ( *editname != '\000' ) /* still have chars in filename */
while ( isthischar(*editname," ./\\") ) /* absolute paths invalid */
strcpy(editname,editname+1); /* so flush leading / or \ (or ' ')*/
if ( *editname == '\000' ) goto end_of_job; /* no chars left in filename */
/* --- remove leading or embedded ../'s and ..\'s --- */
while ( strreplace(editname,"../",NULL,0) > 0 ) ; /* squeeze out ../'s */
while ( strreplace(editname,"..\\",NULL,0) > 0 ) ; /* and ..\'s */
while ( strreplace(editname,"../",NULL,0) > 0 ) ; /* and ../'s again */
/* --- prepend path prefix (if compiled with -DPATHPREFIX) --- */
if ( isprefix && *editname!='\000' ) /* filename is preceded by prefix */
strchange(0,editname,pathprefix); /* so prepend prefix */
end_of_job:
return ( editname ); /* back with edited filename */
} /* --- end-of-function rasteditfilename() --- */
/* ==========================================================================
* Function: rastreadfile ( filename, islock, tag, value )
* Purpose: Read filename, returning value as string
* between <tag>...</tag> or entire file if tag=NULL passed.
* --------------------------------------------------------------------------
* Arguments: filename (I) char * to null-terminated string containing
* name of file to read (preceded by path
* relative to mimetex executable)
* islock (I) int containing 1 to lock file while reading
* (hopefully done by opening in "r+" mode)
* tag (I) char * to null-terminated string containing
* html-like tagname. File contents between
* <tag> and </tag> will be returned, or
* entire file if tag=NULL passed.
* value (O) char * returning value between <tag>...</tag>
* or entire file if tag=NULL.
* --------------------------------------------------------------------------
* Returns: ( int ) 1=okay, 0=some error
* --------------------------------------------------------------------------
* Notes: o
* ======================================================================= */
/* --- entry point --- */
int rastreadfile ( char *filename, int islock, char *tag, char *value )
{
/* -------------------------------------------------------------------------
Allocations and Declarations
-------------------------------------------------------------------------- */
FILE *fp = (FILE *)NULL, *rastopenfile(); /* pointer to opened filename */
char texfile[2048] = "\000", /* local copy of input filename */
text[4096]; /* line from input file */
char *tagp, tag1[512], tag2[512]; /* left <tag> and right <tag/> */
int vallen=0, maxvallen=8000; /* #chars in value, max allowed */
int status = (-1); /* status returned, 1=okay */
int tagnum = 0; /* tag we're looking for */
/*int islock = 1;*/ /* true to lock file */
/* --------------------------------------------------------------------------
Open file
-------------------------------------------------------------------------- */
/* --- first check output arg --- */
if ( value == (char *)NULL ) goto end_of_job; /* no output buffer supplied */
*value = '\000'; /* init buffer with empty string */
/* --- open filename or filename.tex --- */
if ( filename != (char *)NULL ) /* make sure we got filename arg */
{ strcpy(texfile,filename); /* local copy of filename */
fp = rastopenfile(texfile,(islock?"r+":"r")); } /* try opening it */
/* --- check that file opened --- */
if ( fp == (FILE *)NULL ) /* failed to open file */
{ sprintf(value,"{\\normalsize\\rm[file %s?]}",texfile);
goto end_of_job; } /* return error message to caller */
status = 0; /* file opened successfully */
if ( islock ) rewind(fp); /* start at beginning of file */
/* --------------------------------------------------------------------------
construct <tag>'s
-------------------------------------------------------------------------- */
if ( tag != (char *)NULL ) /* caller passed tag arg */
if ( *tag != '\000' ) /* and it's not an empty string */
{ strcpy(tag1,"<"); strcpy(tag2,"</"); /* begin with < and </ */
strcat(tag1,tag); strcat(tag2,tag); /* followed by caller's tag */
strcat(tag1,">"); strcat(tag2,">"); /* ending both tags with > */
compress(tag1,' '); compress(tag2,' '); /* remove embedded blanks */
tagnum = 1; } /* signal that we have tag */
/* --------------------------------------------------------------------------
Read file, concatnate lines
-------------------------------------------------------------------------- */
while ( fgets(text,4090,fp) != (char *)NULL ) { /* read input till eof */
switch ( tagnum ) { /* look for left- or right-tag */
case 0: status = 1; break; /* no tag to look for */
case 1: /* looking for opening left <tag> */
if ( (tagp=strstr(text,tag1)) == NULL ) break; /*haven't found it yet*/
strcpy(text,tagp+strlen(tag1)); /* shift out preceding text */
tagnum = 2; /*now looking for closing right tag*/
case 2: /* looking for closing right </tag> */
if ( (tagp=strstr(text,tag2)) == NULL ) break; /*haven't found it yet*/
*tagp = '\000'; /* terminate line at tag */
tagnum = 3; /* done after this line */
status = 1; /* successfully read tag */
break;
} /* ---end-of-switch(tagnum) --- */
if ( tagnum != 1 ) { /* no tag or left tag already found*/
int textlen = strlen(text); /* #chars in current line */
if ( vallen+textlen > maxvallen ) break; /* quit before overflow */
strcat(value,text); /* concat line to end of value */
vallen += textlen; /* bump length */
if ( tagnum > 2 ) break; } /* found right tag, so we're done */
} /* --- end-of-while(fgets()!=NULL) --- */
if ( tagnum<1 || tagnum>2 ) status=1; /* okay if no tag or we found tag */
fclose ( fp ); /* close input file after reading */
/* --- return value and status to caller --- */
end_of_job:
return ( status ); /* return status to caller */
} /* --- end-of-function rastreadfile() --- */
/* ==========================================================================
* Function: rastwritefile ( filename, tag, value, isstrict )
* Purpose: Re/writes filename, replacing string between <tag>...</tag>
* with value, or writing entire file as value if tag=NULL.
* --------------------------------------------------------------------------
* Arguments: filename (I) char * to null-terminated string containing
* name of file to write (preceded by path
* relative to mimetex executable)
* tag (I) char * to null-terminated string containing
* html-like tagname. File contents between
* <tag> and </tag> will be replaced, or
* entire file written if tag=NULL passed.
* value (I) char * containing string replacing value
* between <tag>...</tag> or replacing entire
* file if tag=NULL.
* isstrict (I) int containing 1 to only rewrite existing
* files, or 0 to create new file if necessary.
* --------------------------------------------------------------------------
* Returns: ( int ) 1=okay, 0=some error
* --------------------------------------------------------------------------
* Notes: o
* ======================================================================= */
/* --- entry point --- */
int rastwritefile( char *filename, char *tag, char *value, int isstrict )
{
/* -------------------------------------------------------------------------
Allocations and Declarations
-------------------------------------------------------------------------- */
FILE *fp = (FILE *)NULL, *rastopenfile(); /* pointer to opened filename */
char texfile[2048] = "\000", /* local copy of input filename */
filebuff[16384] = "\000", /* entire contents of file */
tag1[512], tag2[512], /* left <tag> and right <tag/> */
*strchange(), /* put value between <tag>...</tag>*/
*timestamp(); /* log modification time */
int istag=0, rastreadfile(), /* read file if tag!=NULL */
/*isstrict = (seclevel>5? 1:0),*/ /*true only writes existing files*/
isnewfile = 0, /* true if writing new file */
status = 0; /* status returned, 1=okay */
int istimestamp = 0; /* true to update <timestamp> tag */
/* --------------------------------------------------------------------------
check args
-------------------------------------------------------------------------- */
/* --- check filename and value --- */
if ( filename == (char *)NULL /* quit if no filename arg supplied*/
|| value == (char *)NULL ) goto end_of_job; /* or no value arg supplied */
if ( strlen(filename) < 2 /* quit if unreasonable filename */
|| *value == '\000' ) goto end_of_job; /* or empty value string supplied */
/* --- establish filename[.tex] --- */
strcpy(texfile,filename); /* local copy of input filename */
if ( rastopenfile(texfile,NULL) /* unchanged or .tex appended */
== (FILE *)NULL ) /* can't open, so write new file */
{ if ( isstrict ) goto end_of_job; /* fail if new files not permitted */
isnewfile = 1; } /* signal we're writing new file */
/* --- check whether tag supplied by caller --- */
if ( tag != (char *)NULL ) /* caller passed tag argument */
if ( *tag != '\000' ) /* and it's not an empty string */
{ istag = 1; /* so flip tag flag true */
strcpy(tag1,"<"); strcpy(tag2,"</"); /* begin tags with < and </ */
strcat(tag1,tag); strcat(tag2,tag); /* followed by caller's tag */
strcat(tag1,">"); strcat(tag2,">"); /* ending both tags with > */
compress(tag1,' '); compress(tag2,' '); } /* remove embedded blanks */
/* --------------------------------------------------------------------------
read existing file if just rewriting a single tag
-------------------------------------------------------------------------- */
/* --- read original file if only replacing a tag within it --- */
*filebuff = '\000'; /* init as empty file */
if ( !isnewfile ) /* if file already exists */
if ( istag ) /* and just rewriting one tag */
if ( rastreadfile(texfile,1,NULL,filebuff) /* read entire existing file */
<= 0 ) goto end_of_job; /* signal error if failed to read */
/* --------------------------------------------------------------------------
construct new file data if needed (entire file replaced by value if no tag)
-------------------------------------------------------------------------- */
if ( istag ) /* only replacing tag in file */
{
/* --- find <tag> and </tag> in file --- */
int tlen1=strlen(tag1), tlen2=strlen(tag2), flen; /*tag,buff lengths*/
char *tagp1 = (isnewfile? NULL:strstr(filebuff,tag1)), /* <tag> in file*/
*tagp2 = (isnewfile? NULL:strstr(filebuff,tag2)); /*</tag> in file*/
/* --- if adding new <tag> just concatanate at end of file --- */
if ( tagp1 == (char *)NULL ) /* add new tag to file */
{
/* --- preprocess filebuff --- */
if ( tagp2 != (char *)NULL ) /* apparently have ...</tag> */
strcpy(filebuff,tagp2+tlen2); /* so get rid of leading ...</tag> */
if ( (flen = strlen(filebuff)) /* #chars currently in buffer */
> 0 ) /* we have non-empty buffer */
if (!isthischar(*(filebuff+flen-1),"\n\r")) /*no newline at end of file*/
if(0)strcat(filebuff,"\n"); /* so add one before new tag */
/* --- add new tag --- */
strcat(filebuff,tag1); /* add opening <tag> */
strcat(filebuff,value); /* then value */
strcat(filebuff,tag2); /* finally closing </tag> */
strcat(filebuff,"\n"); /* newline at end of file */
} /* --- end-of-if(tagp1==NULL) --- */
else /* found existing opening <tag> */
{
if ( tagp2 == NULL ) /* apparently have <tag>... */
{ *(tagp1+tlen1) = '\000'; /* so get rid of trailing ... */
strcat(filebuff,value); /* then concatanate value */
strcat(filebuff,tag2); } /* and finally closing </tag> */
else /* else have <tag>...<tag/> */
if ( (flen=((int)(tagp2-tagp1))-tlen1) /* len of .'s in <tag>...</tag> */
>= 0 ) /* usually <tag> precedes </tag> */
strchange(flen,tagp1+tlen1,value); /* change ...'s to value */
else /* weirdly, </tag> precedes <tag> */
{ char fbuff[2048]; /* field buff for <tag>value</tag> */
if ( (flen = ((int)(tagp1-tagp2))+tlen1) /* strlen(</tag>...<tag>) */
<= 0 ) goto end_of_job; /* must be internal error */
strcpy(fbuff,tag1); /* set opening <tag> */
strcat(fbuff,value); /* then value */
strcat(fbuff,tag2); /* finally closing </tag> */
strchange(flen,tagp2,fbuff); } /* replace original </tag>...<tag> */
} /* --- end-of-if/else(tagp1==NULL) --- */
} /* --- end-of-if(istag) --- */
/* --------------------------------------------------------------------------
rewrite file and return to caller
-------------------------------------------------------------------------- */
/* --- first open file for write --- */
if ( (fp=rastopenfile(texfile,"w")) /* open for write */
== (FILE *)NULL ) goto end_of_job; /* signal error if can't open */
/* --- rewrite and close file --- */
if ( fputs((istag?filebuff:value),fp) /* write filebuff or value */
!= EOF ) status = 1; /* signal success if succeeded */
fclose ( fp ); /* close output file after writing */
/* --- modify timestamp --- */
if ( status > 0 ) /*forget timestamp if write failed*/
if ( istimestamp ) /* if we're updating timestamp */
if ( istag ) /* only log time in tagged file */
if ( strstr(tag,"timestamp") == (char *)NULL ) /* but avoid recursion */
{ char fbuff[2048]; /* field buff <timestamp> value */
strcpy(fbuff,tag); /* tag modified */
strcat(fbuff," modified at "); /* spacer */
strcat(fbuff,timestamp(TZDELTA,0)); /* start with timestamp */
status = rastwritefile(filename,"timestamp",fbuff,1); }
/* --- return status to caller --- */
end_of_job:
return ( status ); /* return status to caller */
} /* --- end-of-function rastwritefile() --- */
/* ==========================================================================
* Function: calendar ( year, month, day )
* Purpose: returns null-terminated character string containing
* \begin{array}...\end{array} for the one-month calendar
* specified by year=1973...2099 and month=1...12.
* If either arg out-of-range, today's value is used.
* --------------------------------------------------------------------------
* Arguments: year (I) int containing 1973...2099 or 0 for current
* year
* month (I) int containing 1...12 or 0 for current month
* day (I) int containing day to emphasize or 0
* --------------------------------------------------------------------------
* Returns: ( char * ) char ptr to null-terminated buffer
* containing \begin{array}...\end{array}
* string that will render calendar for
* requested month, or NULL for any error.
* --------------------------------------------------------------------------
* Notes: o
* ======================================================================= */
/* --- entry point --- */
char *calendar( int year, int month, int day )
{
/* -------------------------------------------------------------------------
Allocations and Declarations
-------------------------------------------------------------------------- */
static char calbuff[4096]; /* calendar returned to caller */
time_t time_val = (time_t)(0); /* binary value returned by time() */
struct tm *tmstruct=(struct tm *)NULL, *localtime(); /* interpret time_val */
int yy=0, mm=0, dd=0; /* today (emphasize today's dd) */
int idd=1, iday=0, daynumber(); /* day-of-week for idd=1...31 */
char aval[64]; /* ascii day or 4-digit year */
/* --- calendar data --- */
static char *monthnames[] = { "?", "January", "February", "March", "April",
"May", "June", "July", "August", "September", "October",
"November", "December", "?" } ;
static int modays[] =
{ 0, 31, 28, 31, 30, 31, 30, 31, 31, 30, 31, 30, 31, 0 };
/* -------------------------------------------------------------------------
initialization
-------------------------------------------------------------------------- */
/* --- get current date/time --- */
time((time_t *)(&time_val)); /* get date and time */
tmstruct = localtime((time_t *)(&time_val)); /* interpret time_val */
yy = 1900 + (int)(tmstruct->tm_year); /* current four-digit year */
mm = 1 + (int)(tmstruct->tm_mon); /* current month, 1-12 */
dd = (int)(tmstruct->tm_mday); /* current day, 1-31 */
/* --- check args --- */
if ( year<1973 || year>2099 ) year = yy; /* current year if out-of-bounds */
if ( month<1 || month>12 ) month = mm; /* current month if out-of-bounds */
if ( month==mm && year==yy && day==0 ) /* current month and default day */
day = dd; /* emphasize current day */
modays[2] = (year%4==0?29:28); /* Feb has 29 days in leap years */
/* --- initialize calendar string --- */
strcpy(calbuff,"{\\begin{gather}"); /* center `month year` above cal */
strcat(calbuff,"\\small\\text{"); /* month set in roman */
strcat(calbuff,monthnames[month]); /* insert month name */
strcat(calbuff," }"); /* add a space */
sprintf(aval,"%d",year); /* convert year to ascii */
strcat(calbuff,aval); /* add year */
strcat(calbuff,"\\\\"); /* end top row */
strcat(calbuff, /* now begin calendar arrayr */
"\\begin{array}{|c|c|c|c|c|c|c|CCCCCC} \\hline"
"\\tiny\\text{Sun} & \\tiny\\text{Mon} & \\tiny\\text{Tue} &"
"\\tiny\\text{Wed} & \\tiny\\text{Thu} & \\tiny\\text{Fri} &"
"\\tiny\\text{Sat} \\\\ \\hline " );
/* -------------------------------------------------------------------------
generate calendar
-------------------------------------------------------------------------- */
for ( idd=1; idd<=modays[month]; idd++ ) /* run through days of month */
{
/* --- get day-of-week for this day --- */
iday = 1 + (daynumber(year,month,idd)%7); /* 1=Monday...7=Sunday */
if ( iday == 7 ) iday = 0; /* now 0=Sunday...6=Saturday */
/* --- may need empty cells at beginning of month --- */
if ( idd == 1 ) /* first day of month */
if ( iday > 0 ) /* need to skip cells */
{ strcpy(aval,"\\ &\\ &\\ &\\ &\\ &\\ &\\ &\\ &\\ &\\"); /*cells to skip*/
aval[3*iday] = '\000'; /*skip cells preceding 1st of month*/
strcat(calbuff,aval); } /* add skip string to buffer */
/* --- add idd to current cell --- */
sprintf(aval,"%d",idd); /* convert idd to ascii */
if ( idd == day /* emphasize today's date */
/*&& month==mm && year==yy*/ ) /* only if this month's calendar */
{ strcat(calbuff,"{\\fs{-1}\\left\\langle "); /*emphasize, 1 size smaller*/
strcat(calbuff,aval); /* put in idd */
strcat(calbuff,"\\right\\rangle}"); } /* finish emphasis */
else /* not today's date */
strcat(calbuff,aval); /* so just put in idd */
/* --- terminate cell --- */
if ( idd < modays[month] ) /* not yet end-of-month */
if ( iday < 6 ) /* still have days left in week */
strcat(calbuff,"&"); /* new cell in same week */
else /* reached end-of-week */
strcat(calbuff,"\\\\ \\hline"); /* so start new week */
} /* --- end-of-for(idd) --- */
strcat(calbuff,"\\\\ \\hline"); /* final underline at end-of-month */
/* --- return calendar to caller --- */
strcat(calbuff,"\\end{array}\\end{gather}}"); /* terminate array */
return ( calbuff ); /* back to caller with calendar */
} /* --- end-of-function calendar() --- */
/* ==========================================================================
* Function: timestamp ( tzdelta, ifmt )
* Purpose: returns null-terminated character string containing
* current date:time stamp as ccyy-mm-dd:hh:mm:ss{am,pm}
* --------------------------------------------------------------------------
* Arguments: tzdelta (I) integer, positive or negative, containing
* containing number of hours to be added or
* subtracted from system time (to accommodate
* your desired time zone).
* ifmt (I) integer containing 0 for default format
* --------------------------------------------------------------------------
* Returns: ( char * ) ptr to null-terminated buffer
* containing current date:time stamp
* --------------------------------------------------------------------------
* Notes: o
* ======================================================================= */
/* --- entry point --- */
char *timestamp( int tzdelta, int ifmt )
{
/* -------------------------------------------------------------------------
Allocations and Declarations
-------------------------------------------------------------------------- */
static char timebuff[256]; /* date:time buffer back to caller */
/*long time_val = 0L;*/ /* binary value returned by time() */
time_t time_val = (time_t)(0); /* binary value returned by time() */
struct tm *tmstruct=(struct tm *)NULL, *localtime(); /* interpret time_val */
int year=0, hour=0,ispm=1, /* adjust year, and set am/pm hour */
month=0, day=0; /* adjust day and month for delta */
int tzadjust(); /* time zone adjustment function */
int daynumber(); /* #days since Jan 1, 1973 */
static char *daynames[] = { "Monday", "Tuesday", "Wednesday",
"Thursday", "Friday", "Saturday", "Sunday" } ;
static char *monthnames[] = { "?", "January", "February", "March", "April",
"May", "June", "July", "August", "September", "October",
"November", "December", "?" } ;
/* -------------------------------------------------------------------------
get current date:time, adjust values, and and format stamp
-------------------------------------------------------------------------- */
/* --- first init returned timebuff in case of any error --- */
*timebuff = '\000';
/* --- get current date:time --- */
time((time_t *)(&time_val)); /* get date and time */
tmstruct = localtime((time_t *)(&time_val)); /* interpret time_val */
/* --- extract fields --- */
year = (int)(tmstruct->tm_year); /* local copy of year, 0=1900 */
month = (int)(tmstruct->tm_mon) + 1; /* local copy of month, 1-12 */
day = (int)(tmstruct->tm_mday); /* local copy of day, 1-31 */
hour = (int)(tmstruct->tm_hour); /* local copy of hour, 0-23 */
/* --- adjust year --- */
year += 1900; /* set century in year */
/* --- adjust for timezone --- */
tzadjust(tzdelta,&year,&month,&day,&hour);
/* --- check params --- */
if ( hour<0 || hour>23
|| day<1 || day>31
|| month<1 || month>12
|| year<1973 ) goto end_of_job;
/* --- adjust hour for am/pm --- */
switch ( ifmt )
{
default:
case 0:
if ( hour < 12 ) /* am check */
{ ispm=0; /* reset pm flag */
if ( hour == 0 ) hour = 12; } /* set 00hrs = 12am */
if ( hour > 12 ) hour -= 12; /* pm check sets 13hrs to 1pm, etc */
break;
} /* --- end-of-switch(ifmt) --- */
/* --- format date:time stamp --- */
switch ( ifmt )
{
default:
case 0: /* --- 2005-03-05:11:49:59am --- */
sprintf(timebuff,"%04d-%02d-%02d:%02d:%02d:%02d%s", year,month,day,
hour,(int)(tmstruct->tm_min),(int)(tmstruct->tm_sec),((ispm)?"pm":"am"));
break;
case 1: /* --- Saturday, March 5, 2005 --- */
sprintf(timebuff,"%s, %s %d, %d",
daynames[daynumber(year,month,day)%7],monthnames[month],day,year);
break;
case 2: /* --- Saturday, March 5, 2005, 11:49:59am --- */
sprintf(timebuff,"%s, %s %d, %d, %d:%02d:%02d%s",
daynames[daynumber(year,month,day)%7],monthnames[month],day,year,
hour,(int)(tmstruct->tm_min),(int)(tmstruct->tm_sec),((ispm)?"pm":"am"));
break;
case 3: /* --- 11:49:59am --- */
sprintf(timebuff,"%d:%02d:%02d%s",
hour,(int)(tmstruct->tm_min),(int)(tmstruct->tm_sec),((ispm)?"pm":"am"));
break;
} /* --- end-of-switch(ifmt) --- */
end_of_job:
return ( timebuff ); /* return stamp to caller */
} /* --- end-of-function timestamp() --- */
/* ==========================================================================
* Function: tzadjust ( tzdelta, year, month, day, hour )
* Purpose: Adjusts hour, and day,month,year if necessary,
* by delta increment to accommodate your time zone.
* --------------------------------------------------------------------------
* Arguments: tzdelta (I) integer, positive or negative, containing
* containing number of hours to be added or
* subtracted from given time (to accommodate
* your desired time zone).
* year (I) addr of int containing 4-digit year
* month (I) addr of int containing month 1=Jan - 12=Dec.
* day (I) addr of int containing day 1-31 for Jan.
* hour (I) addr of int containing hour 0-23
* Returns: ( int ) 1 for success, or 0 for error
* --------------------------------------------------------------------------
* Notes: o
* ======================================================================= */
/* --- entry point --- */
int tzadjust ( int tzdelta, int *year, int *month, int *day, int *hour )
{
/* --------------------------------------------------------------------------
Allocations and Declarations
-------------------------------------------------------------------------- */
int yy = *year, mm = *month, dd = *day, hh = *hour; /*dereference args*/
/* --- calendar data --- */
static int modays[] =
{ 0, 31, 28, 31, 30, 31, 30, 31, 31, 30, 31, 30, 31, 0 };
/* --------------------------------------------------------------------------
check args
-------------------------------------------------------------------------- */
if ( mm<1 || mm>12 ) return(-1); /* bad month */
if ( dd<1 || dd>modays[mm] ) return(-1); /* bad day */
if ( hh<0 || hh>23 ) return(-1); /* bad hour */
if ( tzdelta>23 || tzdelta<(-23) ) return(-1); /* bad tzdelta */
/* --------------------------------------------------------------------------
make adjustments
-------------------------------------------------------------------------- */
/* --- adjust hour --- */
hh += tzdelta; /* apply caller's delta */
/* --- adjust for feb 29 --- */
modays[2] = (yy%4==0?29:28); /* Feb has 29 days in leap years */
/* --- adjust day --- */
if ( hh < 0 ) /* went to preceding day */
{ dd--; hh += 24; }
if ( hh > 23 ) /* went to next day */
{ dd++; hh -= 24; }
/* --- adjust month --- */
if ( dd < 1 ) /* went to preceding month */
{ mm--; dd = modays[mm]; }
if ( dd > modays[mm] ) /* went to next month */
{ mm++; dd = 1; }
/* --- adjust year --- */
if ( mm < 1 ) /* went to preceding year */
{ yy--; mm = 12; dd = modays[mm]; }
if ( mm > 12 ) /* went to next year */
{ yy++; mm = 1; dd = 1; }
/* --- back to caller --- */
*year=yy; *month=mm; *day=dd; *hour=hh; /* reset adjusted args */
return ( 1 );
} /* --- end-of-function tzadjust() --- */
/* ==========================================================================
* Function: daynumber ( year, month, day )
* Purpose: Returns number of actual calendar days from Jan 1, 1973
* to the given date (e.g., bvdaynumber(1974,1,1)=365).
* --------------------------------------------------------------------------
* Arguments: year (I) int containing year -- may be either 1995 or
* 95, or may be either 2010 or 110 for those
* years.
* month (I) int containing month, 1=Jan thru 12=Dec.
* day (I) int containing day of month, 1-31 for Jan, etc.
* Returns: ( int ) Number of days from Jan 1, 1973 to given date,
* or -1 for error (e.g., year<1973).
* --------------------------------------------------------------------------
* Notes: o
* ======================================================================= */
/* --- entry point --- */
int daynumber ( int year, int month, int day )
{
/* --------------------------------------------------------------------------
Allocations and Declarations
-------------------------------------------------------------------------- */
/* --- returned value (note: returned as a default "int") --- */
int ndays; /* #days since jan 1, year0 */
/* --- initial conditions --- */
static int year0 = 73, /* jan 1 was a monday, 72 was a leap */
days4yrs = 1461, /* #days in 4 yrs = 365*4 + 1 */
days1yr = 365;
/* --- table of accumulated days per month (last index not used) --- */
static int modays[] =
{ 0, 31, 59, 90, 120, 151, 181, 212, 243, 273, 304, 334, 365 };
/* --- variables for #days since day0 --- */
int nyears, nfouryrs; /*#years, #4-yr periods since year0*/
/* --------------------------------------------------------------------------
Check input
-------------------------------------------------------------------------- */
if ( month < 1 || month > 12 ) /*month used as index, so must be ok*/
return ( -1 ); /* otherwise, forget it */
if ( year >= 1900 ) year -= 1900; /*use two-digit years (3 after 2000)*/
/* --------------------------------------------------------------------------
Find #days since jan 1, 1973
-------------------------------------------------------------------------- */
/* --- figure #complete 4-year periods and #remaining yrs till current --- */
nyears = year - year0; /* #years since year0 */
if ( nyears < 0 ) return ( -1 ); /* we're not working backwards */
nfouryrs = nyears/4; /* #complete four-year periods */
nyears -= (4*nfouryrs); /* remainder excluding current year*/
/* --- #days from jan 1, year0 till jan 1, this year --- */
ndays = (days4yrs*nfouryrs) /* #days in 4-yr periods */
+ (days1yr*nyears); /* +remaining days */
/*if ( year > 100 ) ndays--;*/ /* subtract leap year for 2000AD */
/* --- add #days within current year --- */
ndays += (modays[month-1] + (day-1));
/* --- may need an extra day if current year is a leap year --- */
if ( nyears == 3 ) /*three preceding yrs so this is 4th*/
{ if ( month > 2 ) /* past feb so need an extra day */
/*if ( year != 100 )*/ /* unless it's 2000AD */
ndays++; } /* so add it in */
return ( (int)(ndays) ); /* #days back to caller */
} /* --- end-of-function daynumber() --- */
/* ==========================================================================
* Function: dbltoa ( dblval, npts )
* Purpose: Converts double to ascii, in financial format
* (e.g., comma-separated and negatives enclosed in ()'s).
* -------------------------------------------------------------------------
* Arguments: dblval (I) double containing value to be converted.
* npts (I) int containing #places after decimal point
* to be displayed in returned string.
* Returns: ( char * ) null-terminated string containing
* double converted to financial format.
* -------------------------------------------------------------------------
* Notes: o
* ======================================================================= */
/* --- entry point --- */
char *dbltoa ( double dblval, int npts )
/* double dblval;
int npts; */
{
/* -------------------------------------------------------------------------
Allocations and Declarations
------------------------------------------------------------------------- */
static char finval[128]; /* buffer returned to caller */
static char digittbl[32]="0123456789*"; /* table of ascii decimal digits */
char *finptr = finval; /* ptr to next char being converted*/
double floor(); /* integer which is glb(double) */
double dbldigit; /* to shift out digits from dblval */
int digit; /* one digit from dblval */
int isneg = 0; /* reset true if dblval negative */
int ifrac = 0; /* npts fractional digits of dblval*/
char digits[64]; int ndigits=0; /* all the digits [0]=least signif */
/* -------------------------------------------------------------------------
Check sign
------------------------------------------------------------------------- */
if ( dblval < 0.0 ) /* got a negative value to convert */
{ isneg=1; dblval=(-dblval); } /* set flag and make it positive */
/* -------------------------------------------------------------------------
Get fractional part of dblval if required
------------------------------------------------------------------------- */
if ( npts > 0 )
{ int ipts = npts; /* loop index */
dbldigit = dblval-floor(dblval); /* fractional part as double */
digit = 1; /* check if rounded frac > 1 */
while ( --ipts >= 0 ) /* count down */
{ dbldigit *= 10.0; /* shift left one digit at a time */
digit *= 10; } /* and keep max up-to-date */
ifrac = (int)(dbldigit + 0.5); /* store fractional part as integer*/
if ( ifrac >= digit ) /* round to next whole number */
{ dblval++; ifrac=0; } /* bump val, reset frac to zero */
} /* --- end-of-if(npts>0) --- */
else dblval += 0.5; /* no frac, round to nearest whole */
/* -------------------------------------------------------------------------
Get whole digits
------------------------------------------------------------------------- */
dblval = floor(dblval); /* get rid of fractional part */
while ( dblval > 0.0 ) /* still have data digits remaining*/
{ dbldigit = floor(dblval/10.0); /* shift out next digit */
digit = (int)(dblval - 10.0*dbldigit + 0.01); /* least signif digit */
if ( digit<0 || digit>9 ) digit=10; /* index check */
digits[ndigits++] = digittbl[digit]; /* store ascii digit */
dblval = dbldigit; } /* ready for next digit */
if ( ndigits < 1 ) digits[ndigits++] = '0'; /* store a single '0' for 0.0 */
/* -------------------------------------------------------------------------
Format whole part from digits[] array
------------------------------------------------------------------------- */
if ( isneg ) *finptr++ = '('; /* leading paren for negative value*/
for ( digit=ndigits-1; digit>=0; digit-- ) /* start with most significant */
{ *finptr++ = digits[digit]; /* store digit */
if ( digit>0 && digit%3==0 ) /* need a comma */
*finptr++ = ','; } /* put in separating comma */
/* -------------------------------------------------------------------------
Format fractional part using ifrac
------------------------------------------------------------------------- */
if ( npts > 0 )
{ *finptr++ = '.'; /* start with decimal point */
sprintf(finptr,"%0*d",npts,ifrac); /* convert to string */
finptr += npts; } /* bump ptr past fractional digits */
/* -------------------------------------------------------------------------
End-of-Job
------------------------------------------------------------------------- */
if ( isneg ) *finptr++ = ')'; /*trailing paren for negative value*/
*finptr = '\000'; /* null-terminate converted double */
return ( finval ); /* converted double back to caller */
} /* --- end-of-function dbltoa() --- */
/* ==========================================================================
* Function: aalowpass ( rp, bytemap, grayscale )
* Purpose: calculates a lowpass anti-aliased bytemap
* for rp->bitmap, with each byte 0...grayscale-1
* --------------------------------------------------------------------------
* Arguments: rp (I) raster * to raster whose bitmap
* is to be anti-aliased
* bytemap (O) intbyte * to bytemap, calculated
* by applying lowpass filter to rp->bitmap,
* and returned (as you'd expect) in 1-to-1
* addressing correspondence with rp->bitmap
* grayscale (I) int containing number of grayscales
* to be calculated, 0...grayscale-1
* (should typically be given as 256)
* --------------------------------------------------------------------------
* Returns: ( int ) 1=success, 0=any error
* --------------------------------------------------------------------------
* Notes: o If the center point of the box being averaged is black,
* then the entire "average" is forced black (grayscale-1)
* regardless of the surrounding points. This is my attempt
* to avoid a "washed-out" appearance of thin (one-pixel-wide)
* lines, which would otherwise turn from black to a gray shade.
* o Also, while the weights for neighbor points are fixed,
* you may adjust the center point weight on the compile line.
* A higher weight sharpens the resulting anti-aliased image;
* lower weights blur it out more (but keep the "center" black
* as per the preceding note).
* ======================================================================= */
/* --- entry point --- */
int aalowpass (raster *rp, intbyte *bytemap, int grayscale)
{
/* -------------------------------------------------------------------------
Allocations and Declarations
-------------------------------------------------------------------------- */
int status = 1; /* 1=success, 0=failure to caller */
pixbyte *bitmap= (rp==NULL?NULL:rp->pixmap); /*local rp->pixmap ptr*/
int irow=0, icol=0; /* rp->height, rp->width indexes */
int weights[9] = { 1,3,1, 3,0,3, 1,3,1 }; /* matrix of weights */
int adjindex[9]= { 0,1,2, 7,-1,3, 6,5,4 }; /*clockwise from upper-left*/
int totwts = 0; /* sum of all weights in matrix */
int isforceavg = 1, /*force avg black if center black?*/
isminmaxwts = 1, /*use wts or #pts for min/max test */
blackscale = 0; /*(grayscale+1)/4;*/ /*force black if wgted avg>bs */
/* -------------------------------------------------------------------------
Initialization
-------------------------------------------------------------------------- */
/* --- calculate total weights --- */
weights[4]= centerwt; /* weight for center point */
weights[1]= weights[3]= weights[5]= weights[7]= adjacentwt; /*adjacent pts*/
totwts = centerwt + 4*(1+adjacentwt); /* tot is center plus neighbors */
/* -------------------------------------------------------------------------
Calculate bytemap as 9-point weighted average over bitmap
-------------------------------------------------------------------------- */
for ( irow=0; irow<rp->height; irow++ )
for ( icol=0; icol<rp->width; icol++ )
{
int ipixel = icol + irow*(rp->width); /* center pixel index */
int jrow=0, jcol=0, /* box around ipixel */
bitval = 0, /* value of bit/pixel at jrow,jcol */
iscenter = 0, /* set true if center pixel black */
nadjacent=0, wadjacent=0, /* #adjacent black pixels, their wts*/
ngaps = 0, /* #gaps in 8 pixels around center */
iwt=(-1), sumwts=0; /* weights index, sum in-bound wts */
char adjmatrix[8]; /* adjacency "matrix" */
memset(adjmatrix,0,8); /* zero out adjacency matrix */
bytemap[ipixel] = 0; /* init pixel white */
/*--- for ipixel at irow,icol, get weighted average of adjacent pixels ---*/
for ( jrow=irow-1; jrow<=irow+1; jrow++ ) /* jrow = irow-1...irow+1 */
for ( jcol=icol-1; jcol<=icol+1; jcol++ ) /* jcol = icol-1...icol+1 */
{
int jpixel = jcol + jrow*(rp->width); /* averaging index */
iwt++; /*always bump weight index*/
if ( jrow<0 || jrow>=rp->height /* if row out pf bounds */
|| jcol<0 || jcol>=rp->width ) /* or col out of bounds */
continue; /* ignore this point */
bitval = (int)getlongbit(bitmap,jpixel); /* value of bit at jrow,jcol */
if ( bitval ) /* this is a black pixel */
{ if ( jrow==irow && jcol==icol ) /* and this is center point */
iscenter = 1; /* set flag for center point black */
else /* adjacent point black */
{ nadjacent++; /* bump adjacent black count */
adjmatrix[adjindex[iwt]] = 1; } /*set "bit" in adjacency matrix*/
wadjacent += weights[iwt]; } /* sum weights for black pixels */
sumwts += weights[iwt]; /* and sum weights for all pixels */
} /* --- end-of-for(jrow,jcol) --- */
/* --- count gaps --- */
ngaps = (adjmatrix[7]!=adjmatrix[0]?1:0); /* init count */
for ( iwt=0; iwt<7; iwt++ ) /* clockwise around adjacency */
if ( adjmatrix[iwt] != adjmatrix[iwt+1] ) ngaps++; /* black/white flip */
ngaps /= 2; /*each gap has 2 black/white flips*/
/* --- anti-alias pixel, but leave it black if it was already black --- */
if ( isforceavg && iscenter ) /* force avg if center point black */
bytemap[ipixel] = grayscale-1; /* so force grayscale-1=black */
else /* center point not black */
if ( ngaps <= 2 ) /*don't darken checkerboarded pixel*/
{ bytemap[ipixel] = /* 0=white ... grayscale-1=black */
((totwts/2 - 1) + (grayscale-1)*wadjacent)/totwts; /* not /sumwts; */
if ( blackscale > 0 /* blackscale kludge turned on */
&& bytemap[ipixel] > blackscale ) /* weighted avg > blackscale */
bytemap[ipixel] = grayscale-1; } /* so force it entirely black */
/*--- only anti-alias pixels whose adjacent pixels fall within bounds ---*/
if ( !iscenter ) /* apply min/maxadjacent test */
if ( isminmaxwts ) /* min/max refer to adjacent weights*/
{ if ( wadjacent < minadjacent /* wts of adjacent points too low */
|| wadjacent > maxadjacent ) /* or too high */
bytemap[ipixel] = 0; } /* so leave point white */
else /* min/max refer to #adjacent points*/
{ if ( nadjacent < minadjacent /* too few adjacent points black */
|| nadjacent > maxadjacent ) /* or too many */
bytemap[ipixel] = 0; } /* so leave point white */
} /* --- end-of-for(irow,icol) --- */
/* -------------------------------------------------------------------------
Back to caller with gray-scale anti-aliased bytemap
-------------------------------------------------------------------------- */
/*end_of_job:*/
return ( status );
} /* --- end-of-function aalowpass() --- */
/* ==========================================================================
* Function: aapnm ( rp, bytemap, grayscale )
* Purpose: calculates a lowpass anti-aliased bytemap
* for rp->bitmap, with each byte 0...grayscale-1,
* based on the pnmalias.c algorithm
* --------------------------------------------------------------------------
* Arguments: rp (I) raster * to raster whose bitmap
* is to be anti-aliased
* bytemap (O) intbyte * to bytemap, calculated
* by applying pnm-based filter to rp->bitmap,
* and returned (as you'd expect) in 1-to-1
* addressing correspondence with rp->bitmap
* grayscale (I) int containing number of grayscales
* to be calculated, 0...grayscale-1
* (should typically be given as 256)
* --------------------------------------------------------------------------
* Returns: ( int ) 1=success, 0=any error
* --------------------------------------------------------------------------
* Notes: o Based on the pnmalias.c algorithm in the netpbm package
* on sourceforge.
* ======================================================================= */
/* --- entry point --- */
int aapnm (raster *rp, intbyte *bytemap, int grayscale)
{
/* -------------------------------------------------------------------------
Allocations and Declarations
-------------------------------------------------------------------------- */
pixbyte *bitmap = rp->pixmap; /* local rp->pixmap ptr */
int width=rp->width, height=rp->height, /* width, height of raster */
icol = 0, irow = 0, /* width, height indexes */
imap = (-1); /* pixel index = icol + irow*width */
int bgbitval=0, fgbitval=1; /* background, foreground bitval */
#if 0
int totwts=12, wts[9]={1,1,1, 1,4,1, 1,1,1}; /* pnmalias default wts */
int totwts=16, wts[9]={1,2,1, 2,4,2, 1,2,1}; /* weights */
#endif
int totwts=18, wts[9]={1,2,1, 2,6,2, 1,2,1}; /* pnmalias default wts */
int isresetparams = 1, /* true to set antialiasing params */
isfgalias = 1, /* true to antialias fg bits */
isfgonly = 0, /* true to only antialias fg bits */
isbgalias = 0, /* true to antialias bg bits */
isbgonly = 0; /* true to only antialias bg bits */
/* -------------------------------------------------------------------------
Initialization
-------------------------------------------------------------------------- */
/* --- check for bold light --- */
if ( 0 )
{ if ( weightnum > 2 ) { isbgalias=1; } /* simulate bold */
if ( weightnum < 1 ) { isbgonly=1; isfgalias=0; } } /* simulate light */
/* --- reset wts[], etc, and calculate total weights --- */
if ( isresetparams ) /* wts[], etc taken from params */
{ int iwt=0; /* wts[iwt] index */
wts[4]= centerwt; /* weight for center point */
wts[1]=wts[3]=wts[5]=wts[7] = adjacentwt; /* and adjacent points */
wts[0]=wts[2]=wts[6]=wts[8] = cornerwt; /* and corner points */
for ( totwts=0,iwt=0; iwt<9; iwt++ ) totwts += wts[iwt]; /* sum wts */
isfgalias = fgalias; /* set isfgalias */
isfgonly = fgonly; /* set isfgonly */
isbgalias = bgalias; /* set isbgalias */
isbgonly = bgonly; } /* set isbgonly */
/* -------------------------------------------------------------------------
Calculate bytemap as 9-point weighted average over bitmap
-------------------------------------------------------------------------- */
for ( irow=0; irow<height; irow++ )
for ( icol=0; icol<width; icol++ )
{
/* --- local allocations and declarations --- */
int bitval=0, /* value of rp bit at irow,icol */
nnbitval=0, nebitval=0, eebitval=0, sebitval=0, /*adjacent vals*/
ssbitval=0, swbitval=0, wwbitval=0, nwbitval=0; /*compass pt names*/
int isbgedge=0, isfgedge=0; /*does pixel border a bg or fg edge*/
int aabyteval=0; /* antialiased (or unchanged) value*/
/* --- bump imap index and get center bit value --- */
imap++; /* imap = icol + irow*width */
bitval = getlongbit(bitmap,imap); /* value of rp input bit at imap */
aabyteval = (intbyte)(bitval==bgbitval?0:grayscale-1); /* default aa val */
bytemap[imap] = (intbyte)(aabyteval); /* init antialiased pixel */
/* --- check if we're antialiasing this pixel --- */
if ( (isbgonly && bitval==fgbitval) /* only antialias background bit */
|| (isfgonly && bitval==bgbitval) ) /* only antialias foreground bit */
continue; /* leave default and do next bit */
/* --- get surrounding bits --- */
if ( irow > 0 ) /* nn (north) bit available */
nnbitval = getlongbit(bitmap,imap-width); /* nn bit value */
if ( irow < height-1 ) /* ss (south) bit available */
ssbitval = getlongbit(bitmap,imap+width); /* ss bit value */
if ( icol > 0 ) /* ww (west) bit available */
{ wwbitval = getlongbit(bitmap,imap-1); /* ww bit value */
if ( irow > 0 ) /* nw bit available */
nwbitval = getlongbit(bitmap,imap-width-1); /* nw bit value */
if ( irow < height-1 ) /* sw bit available */
swbitval = getlongbit(bitmap,imap+width-1); } /* sw bit value */
if ( icol < width-1 ) /* ee (east) bit available */
{ eebitval = getlongbit(bitmap,imap+1); /* ee bit value */
if ( irow > 0 ) /* ne bit available */
nebitval = getlongbit(bitmap,imap-width+1); /* ne bit value */
if ( irow < height-1 ) /* se bit available */
sebitval = getlongbit(bitmap,imap+width+1); } /* se bit value */
/* --- check for edges --- */
isbgedge = /* current pixel borders a bg edge */
(nnbitval==bgbitval && eebitval==bgbitval) || /*upper-right edge*/
(eebitval==bgbitval && ssbitval==bgbitval) || /*lower-right edge*/
(ssbitval==bgbitval && wwbitval==bgbitval) || /*lower-left edge*/
(wwbitval==bgbitval && nnbitval==bgbitval) ; /*upper-left edge*/
isfgedge = /* current pixel borders an fg edge*/
(nnbitval==fgbitval && eebitval==fgbitval) || /*upper-right edge*/
(eebitval==fgbitval && ssbitval==fgbitval) || /*lower-right edge*/
(ssbitval==fgbitval && wwbitval==fgbitval) || /*lower-left edge*/
(wwbitval==fgbitval && nnbitval==fgbitval) ; /*upper-left edge*/
/* ---check top/bot left/right edges for corners (added by j.forkosh)--- */
if ( 1 ) { /* true to perform test */
int isbghorz=0, isfghorz=0, isbgvert=0, isfgvert=0; /* horz/vert edges */
isbghorz = /* top or bottom edge is all bg */
(nwbitval+nnbitval+nebitval == 3*bgbitval) || /* top edge bg */
(swbitval+ssbitval+sebitval == 3*bgbitval) ; /* bottom edge bg */
isfghorz = /* top or bottom edge is all fg */
(nwbitval+nnbitval+nebitval == 3*fgbitval) || /* top edge fg */
(swbitval+ssbitval+sebitval == 3*fgbitval) ; /* bottom edge fg */
isbgvert = /* left or right edge is all bg */
(nwbitval+wwbitval+swbitval == 3*bgbitval) || /* left edge bg */
(nebitval+eebitval+sebitval == 3*bgbitval) ; /* right edge bg */
isfgvert = /* left or right edge is all bg */
(nwbitval+wwbitval+swbitval == 3*fgbitval) || /* left edge fg */
(nebitval+eebitval+sebitval == 3*fgbitval) ; /* right edge fg */
if ( (isbghorz && isbgvert && (bitval==fgbitval)) /* we're at an...*/
|| (isfghorz && isfgvert && (bitval==bgbitval)) ) /*...inside corner */
continue; /* don't antialias */
} /* --- end-of-if(1) --- */
/* --- check #gaps for checkerboard (added by j.forkosh) --- */
if ( 0 ) { /* true to perform test */
int ngaps=0, mingaps=1,maxgaps=2; /* count #fg/bg flips (max=4 noop) */
if ( nwbitval!=nnbitval ) ngaps++; /* upper-left =? upper */
if ( nnbitval!=nebitval ) ngaps++; /* upper =? upper-right */
if ( nebitval!=eebitval ) ngaps++; /* upper-right =? right */
if ( eebitval!=sebitval ) ngaps++; /* right =? lower-right */
if ( sebitval!=ssbitval ) ngaps++; /* lower-right =? lower */
if ( ssbitval!=swbitval ) ngaps++; /* lower =? lower-left */
if ( swbitval!=wwbitval ) ngaps++; /* lower-left =? left */
if ( wwbitval!=nwbitval ) ngaps++; /* left =? upper-left */
if ( ngaps > 0 ) ngaps /= 2; /* each gap has 2 bg/fg flips */
if ( ngaps<mingaps || ngaps>maxgaps ) continue;
} /* --- end-of-if(1) --- */
/* --- antialias if necessary --- */
if ( (isbgalias && isbgedge) /* alias pixel surrounding bg */
|| (isfgalias && isfgedge) /* alias pixel surrounding fg */
|| (isbgedge && isfgedge) ) /* neighboring fg and bg pixel */
{
int aasumval = /* sum wts[]*bitmap[] */
wts[0]*nwbitval + wts[1]*nnbitval + wts[2]*nebitval +
wts[3]*wwbitval + wts[4]*bitval + wts[5]*eebitval +
wts[6]*swbitval + wts[7]*ssbitval + wts[8]*sebitval ;
double aawtval = ((double)aasumval)/((double)totwts); /* weighted val */
aabyteval= (int)(((double)(grayscale-1))*aawtval+0.5); /*0...grayscale-1*/
bytemap[imap] = (intbyte)(aabyteval); /* set antialiased pixel */
if ( msglevel>=99 && msgfp!=NULL ) fprintf(msgfp, /* debugging */
"aapnm> irow,icol,imap=%d,%d,%d aawtval=%.4f aabyteval=%d\n",
irow,icol,imap, aawtval,aabyteval);
} /* --- end-of-if(isedge) --- */
} /* --- end-of-for(irow,icol) --- */
/* -------------------------------------------------------------------------
Back to caller with gray-scale anti-aliased bytemap
-------------------------------------------------------------------------- */
/*end_of_job:*/
return ( 1 );
} /* --- end-of-function aapnm() --- */
/* ==========================================================================
* Function: aasupsamp ( rp, aa, sf, grayscale )
* Purpose: calculates a supersampled anti-aliased bytemap
* for rp->bitmap, with each byte 0...grayscale-1
* --------------------------------------------------------------------------
* Arguments: rp (I) raster * to raster whose bitmap
* is to be anti-aliased
* aa (O) address of raster * to supersampled bytemap,
* calculated by supersampling rp->bitmap
* sf (I) int containing supersampling shrinkfactor
* grayscale (I) int containing number of grayscales
* to be calculated, 0...grayscale-1
* (should typically be given as 256)
* --------------------------------------------------------------------------
* Returns: ( int ) 1=success, 0=any error
* --------------------------------------------------------------------------
* Notes: o If the center point of the box being averaged is black,
* then the entire "average" is forced black (grayscale-1)
* regardless of the surrounding points. This is my attempt
* to avoid a "washed-out" appearance of thin (one-pixel-wide)
* lines, which would otherwise turn from black to a gray shade.
* ======================================================================= */
/* --- entry point --- */
int aasupsamp (raster *rp, raster **aa, int sf, int grayscale)
{
/* -------------------------------------------------------------------------
Allocations and Declarations
-------------------------------------------------------------------------- */
int status = 0; /* 1=success, 0=failure to caller */
int rpheight=rp->height, rpwidth=rp->width, /*bitmap raster dimensions*/
heightrem=0, widthrem=0, /* rp+rem is a multiple of shrinkf */
aaheight=0, aawidth=0, /* supersampled dimensions */
aapixsz=8; /* output pixels are 8-bit bytes */
int maxaaval=(-9999), /* max grayscale val set in matrix */
isrescalemax=1; /* 1=rescale maxaaval to grayscale */
int irp=0,jrp=0, iaa=0,jaa=0, iwt=0,jwt=0; /*indexes, i=width j=height*/
raster *aap=NULL, *new_raster(); /* raster for supersampled image */
raster *aaweights(); /* get weight matrix applied to rp */
static raster *aawts = NULL; /* aaweights() resultant matrix */
static int prevshrink = NOVALUE, /* shrinkfactor from previous call */
sumwts = 0; /* sum of weights */
static int blackfrac = 40, /* force black if this many pts are */
/*grayfrac = 20,*/
maxwt = 10, /* max weight in weight matrix */
minwtfrac=10, maxwtfrac=70; /* force light pts white, dark black*/
int type_raster(), type_bytemap(); /* debugging display routines */
int delete_raster(); /* delete old rasters */
/* -------------------------------------------------------------------------
Initialization
-------------------------------------------------------------------------- */
/* --- check args --- */
if ( aa == NULL ) goto end_of_job; /* no ptr for return output arg */
*aa = NULL; /* init null ptr for error return */
if ( rp == NULL /* no ptr to input arg */
|| sf < 1 /* invalid shrink factor */
|| grayscale < 2 ) goto end_of_job; /* invalid grayscale */
/* --- get weight matrix (or use current one) --- */
if ( sf != prevshrink ) /* have new shrink factor */
{ if ( aawts != NULL ) /* have unneeded weight matrix */
delete_raster(aawts); /* so free it */
sumwts = 0; /* reinitialize sum of weights */
aawts = aaweights(sf,sf); /* get new weight matrix */
if ( aawts != NULL ) /* got weight matrix okay*/
for ( jwt=0; jwt<sf; jwt++ ) /* for each row */
for ( iwt=0; iwt<sf; iwt++ ) /* and each column */
{ int wt = (int)(getpixel(aawts,jwt,iwt)); /* weight */
if ( wt > maxwt ) /* don't overweight center pts */
{ wt = maxwt; /* scale it back */
setpixel(aawts,jwt,iwt,wt); } /* and replace it in matrix */
sumwts += wt; } /* add weight to sum */
prevshrink = sf; } /* save new shrink factor */
if ( msgfp!=NULL && msglevel>=999 )
{ fprintf(msgfp,"aasupsamp> sf=%d, sumwts=%d weights=...\n", sf,sumwts);
type_bytemap((intbyte *)aawts->pixmap,grayscale,
aawts->width,aawts->height,msgfp); }
/* --- calculate supersampled height,width and allocate output raster */
heightrem = rpheight%sf; /* remainder after division... */
widthrem = rpwidth%sf; /* ...by shrinkfactor */
aaheight = 1+(rpheight+sf-(heightrem+1))/sf; /* ss height */
aawidth = 1+(rpwidth+sf-(widthrem+1))/sf; /* ss width */
if ( msgfp!=NULL && msglevel>=999 )
{ fprintf(msgfp,"aasupsamp> rpwid,ht=%d,%d wd,htrem=%d,%d aawid,ht=%d,%d\n",
rpwidth,rpheight, widthrem,heightrem, aawidth,aaheight);
fprintf(msgfp,"aasupsamp> dump of original bitmap image...\n");
type_raster(rp,msgfp); } /* ascii image of rp raster */
if ( (aap = new_raster(aawidth,aaheight,aapixsz)) /* alloc output raster*/
== NULL ) goto end_of_job; /* quit if alloc fails */
/* -------------------------------------------------------------------------
Step through rp->bitmap, applying aawts to each "submatrix" of bitmap
-------------------------------------------------------------------------- */
for ( jaa=0,jrp=(-(heightrem+1)/2); jrp<rpheight; jrp+=sf ) /* height */
{
for ( iaa=0,irp=(-(widthrem+1)/2); irp<rpwidth; irp+=sf ) /* width */
{
int aaval=0; /* weighted rpvals */
int nrp=0, mrp=0; /* #rp bits set, #within matrix */
for ( jwt=0; jwt<sf; jwt++ )
for ( iwt=0; iwt<sf; iwt++ )
{
int i=irp+iwt, j=jrp+jwt; /* rp->pixmap point */
int rpval = 0; /* rp->pixmap value at i,j */
if ( i>=0 && i<rpwidth /* i within actual pixmap */
&& j>=0 && j<rpheight ) /* ditto j */
{ mrp++; /* count another bit within matrix */
rpval = (int)(getpixel(rp,j,i)); } /* get actual pixel value */
if ( rpval != 0 )
{ nrp++; /* count another bit set */
aaval += (int)(getpixel(aawts,jwt,iwt)); } /* sum weighted vals */
} /* --- end-of-for(iwt,jwt) --- */
if ( aaval > 0 ) /*normalize and rescale non-zero val*/
{ int aafrac = (100*aaval)/sumwts; /* weighted percent of black points */
/*if((100*nrp)/mrp >=blackfrac)*/ /* many black interior pts */
if( aafrac >= maxwtfrac ) /* high weight of sampledblack pts */
aaval = grayscale-1; /* so set supersampled pt black */
else if( aafrac <= minwtfrac ) /* low weight of sampledblack pts */
aaval = 0; /* so set supersampled pt white */
else /* rescale calculated weight */
aaval = ((sumwts/2 - 1) + (grayscale-1)*aaval)/sumwts; }
maxaaval = max2(maxaaval,aaval); /* largest aaval so far */
if ( msgfp!=NULL && msglevel>=999 )
fprintf(msgfp,"aasupsamp> jrp,irp=%d,%d jaa,iaa=%d,%d"
" mrp,nrp=%d,%d aaval=%d\n",
jrp,irp, jaa,iaa, mrp,nrp, aaval);
if ( jaa<aaheight && iaa<aawidth ) /* bounds check */
setpixel(aap,jaa,iaa,aaval); /*weighted val in supersamp raster*/
else if( msgfp!=NULL && msglevel>=9 ) /* emit error if out-of-bounds */
fprintf(msgfp,"aasupsamp> Error: aaheight,aawidth=%d,%d jaa,iaa=%d,%d\n",
aaheight,aawidth, jaa,iaa);
iaa++; /* bump aa col index */
} /* --- end-of-for(irp) --- */
jaa++; /* bump aa row index */
} /* --- end-of-for(jrp) --- */
/* --- rescale supersampled image so darkest points become black --- */
if ( isrescalemax ) /* flag set to rescale maxaaval */
{
double scalef = ((double)(grayscale-1))/((double)maxaaval);
for ( jaa=0; jaa<aaheight; jaa++ ) /* height */
for ( iaa=0; iaa<aawidth; iaa++ ) /* width */
{ int aafrac, aaval = getpixel(aap,jaa,iaa); /* un-rescaled value */
aaval = (int)(0.5+((double)aaval)*scalef); /*multiply by scale factor*/
aafrac = (100*aaval)/(grayscale-1); /* fraction of blackness */
if( aafrac >= blackfrac ) /* high weight of sampledblack pts */
aaval = grayscale-1; /* so set supersampled pt black */
else if( 0&&aafrac <= minwtfrac ) /* low weight of sampledblack pts */
aaval = 0; /* so set supersampled pt white */
setpixel(aap,jaa,iaa,aaval); } /* replace rescaled val in raster */
} /* --- end-of-if(isrescalemax) --- */
*aa = aap; /* return supersampled image*/
status = 1; /* set successful status */
if ( msgfp!=NULL && msglevel>=999 )
{ fprintf(msgfp,"aasupsamp> anti-aliased image...\n");
type_bytemap((intbyte *)aap->pixmap,grayscale,
aap->width,aap->height,msgfp); fflush(msgfp); }
/* -------------------------------------------------------------------------
Back to caller with gray-scale anti-aliased bytemap
-------------------------------------------------------------------------- */
end_of_job:
return ( status );
} /* --- end-of-function aasupsamp() --- */
/* ==========================================================================
* Function: aacolormap ( bytemap, nbytes, colors, colormap )
* Purpose: searches bytemap, returning a list of its discrete values
* in ascending order in colors[], and returning an "image"
* of bytemap (where vales are replaced by colors[]
* indexes) in colormap[].
* --------------------------------------------------------------------------
* Arguments: bytemap (I) intbyte * to bytemap containing
* grayscale values (usually 0=white
* through 255=black) for which colors[]
* and colormap[] will be constructed.
* nbytes (I) int containing #bytes in bytemap
* (usually just #rows * #cols)
* colors (O) intbyte * (to be interpreted as ints)
* returning a list of the discrete/different
* values in bytemap, in ascending value order
* colormap (O) intbyte * returning a bytemap "image",
* i.e., in one-to-one pixel correspondence
* with bytemap, but where the values have been
* replaced with corresponding colors[] indexes.
* --------------------------------------------------------------------------
* Returns: ( int ) #colors in colors[], or 0 for any error
* --------------------------------------------------------------------------
* Notes: o
* ======================================================================= */
/* --- entry point --- */
int aacolormap ( intbyte *bytemap, int nbytes,
intbyte *colors, intbyte *colormap )
{
/* -------------------------------------------------------------------------
Allocations and Declarations
-------------------------------------------------------------------------- */
int ncolors = 0, /* #different values in bytemap */
igray, grayscale = 256; /* bytemap contains intbyte's */
intbyte *bytevalues = NULL; /* 1's where bytemap contains value*/
int ibyte; /* bytemap/colormap index */
int isscale = 0; /* true to scale largest val to 255*/
int maxcolors = 0; /* maximum ncolors */
/* -------------------------------------------------------------------------
Accumulate colors[] from values occurring in bytemap
-------------------------------------------------------------------------- */
/* --- initialization --- */
if ( (bytevalues = (intbyte *)malloc(grayscale)) /*alloc bytevalues*/
== NULL ) goto end_of_job; /* signal error if malloc() failed */
memset(bytevalues,0,grayscale); /* zero out bytevalues */
/* --- now set 1's at offsets corresponding to values found in bytemap --- */
for ( ibyte=0; ibyte<nbytes; ibyte++ ) /* for each byte in bytemap */
bytevalues[(int)bytemap[ibyte]] = 1; /*use its value to index bytevalues*/
/* --- collect the 1's indexes in colors[] --- */
for ( igray=0; igray<grayscale; igray++ ) /* check all possible values */
if ( (int)bytevalues[igray] ) /*bytemap contains igray somewheres*/
{ colors[ncolors] = (intbyte)igray; /* so store igray in colors */
bytevalues[igray] = (intbyte)ncolors; /* save colors[] index */
if ( maxcolors>0 && ncolors>=maxcolors ) /* too many color indexes */
bytevalues[igray] = (intbyte)(maxcolors-1); /*so scale back to max*/
ncolors++; } /* and bump #colors */
/* --- rescale colors so largest, colors[ncolors-1], is black --- */
if ( isscale ) /* only rescale if requested */
if ( ncolors > 1 ) /* and if not a "blank" raster */
if ( colors[ncolors-1] > 0 ) /*and at least one pixel non-white*/
{
/* --- multiply each colors[] by factor that scales largest to 255 --- */
double scalefactor = ((double)(grayscale-1))/((double)colors[ncolors-1]);
for ( igray=1; igray<ncolors; igray++ ) /* re-scale each colors[] */
{ colors[igray] = min2(grayscale-1,(int)(scalefactor*colors[igray]+0.5));
if (igray>5) colors[igray] = min2(grayscale-1,colors[igray]+2*igray); }
} /* --- end-of-if(isscale) --- */
/* -------------------------------------------------------------------------
Construct colormap
-------------------------------------------------------------------------- */
for ( ibyte=0; ibyte<nbytes; ibyte++ ) /* for each byte in bytemap */
colormap[ibyte] = bytevalues[(int)bytemap[ibyte]]; /*index for this value*/
/* -------------------------------------------------------------------------
back to caller with #colors, or 0 for any error
-------------------------------------------------------------------------- */
end_of_job:
if ( bytevalues != NULL ) free(bytevalues); /* free working memory */
if ( maxcolors>0 && ncolors>maxcolors ) /* too many color indexes */
ncolors = maxcolors; /* return maximum to caller */
return ( ncolors ); /* back with #colors, or 0=error */
} /* --- end-of-function aacolormap() --- */
/* ==========================================================================
* Function: aaweights ( width, height )
* Builds "canonical" weight matrix, width x height, in a raster
* (see Notes below for discussion).
* --------------------------------------------------------------------------
* Arguments: width (I) int containing width (#cols) of returned
* raster/matrix of weights
* height (I) int containing height (#rows) of returned
* raster/matrix of weights
* --------------------------------------------------------------------------
* Returns: ( raster * ) ptr to raster containing width x height
* weight matrix, or NULL for any error
* --------------------------------------------------------------------------
* Notes: o For example, given width=7, height=5, builds the matrix
* 1 2 3 4 3 2 1
* 2 4 6 8 6 4 2
* 3 6 9 12 9 6 3
* 2 4 6 8 6 4 2
* 1 2 3 4 3 2 1
* If an even dimension given, the two center numbers stay
* the same, e.g., 123321 for the top row if width=6.
* o For an odd square n x n matrix, the sum of all n^2
* weights will be ((n+1)/2)^4.
* o The largest weight (in the allocated pixsz=8 raster) is 255,
* so the largest square matrix is 31 x 31. Any weight that
* tries to grow beyond 255 is held constant at 255.
* o A new_raster(), pixsz=8, is allocated for the caller.
* To avoid memory leaks, be sure to delete_raster() when done.
* ======================================================================= */
/* --- entry point --- */
raster *aaweights ( int width, int height )
{
/* -------------------------------------------------------------------------
Allocations and Declarations
-------------------------------------------------------------------------- */
raster *new_raster(), *weights=NULL; /* raster of weights returned */
int irow=0, icol=0, /* height, width indexes */
weight = 0; /*running weight, as per Notes above*/
/* -------------------------------------------------------------------------
Initialization
-------------------------------------------------------------------------- */
/* --- allocate raster for weights --- */
if ( (weights = new_raster(width,height,8)) /* allocate 8-bit byte raster */
== NULL ) goto end_of_job; /* return NULL error if failed */
/* -------------------------------------------------------------------------
Fill weight matrix, as per Notes above
-------------------------------------------------------------------------- */
for ( irow=0; irow<height; irow++ ) /* outer loop over rows */
for ( icol=0; icol<width; icol++ ) /* inner loop over cols */
{
int jrow = height-irow-1, /* backwards irow, height-1,...,0 */
jcol = width-icol-1; /* backwards icol, width-1,...,0 */
weight = min2(irow+1,jrow+1) * min2(icol+1,jcol+1); /* weight */
if ( aaalgorithm == 1 ) weight=1; /* force equal weights */
setpixel(weights,irow,icol,min2(255,weight)); /*store weight in matrix*/
} /* --- end-of-for(irow,icol) --- */
end_of_job:
return ( weights ); /* back with weights or NULL=error */
} /* --- end-of-function aaweights() --- */
/* ==========================================================================
* Function: aawtpixel ( image, ipixel, weights, rotate )
* Purpose: Applies matrix of weights to the pixels
* surrounding ipixel in image, rotated clockwise
* by rotate degrees (typically 0 or 30).
* --------------------------------------------------------------------------
* Arguments: image (I) raster * to bitmap (though it can be bytemap)
* containing image with pixels to be averaged.
* ipixel (I) int containing index (irow*width+icol) of
* center pixel of image for weighted average.
* weights (I) raster * to bytemap of relative weights
* (0-255), whose dimensions (usually odd width
* and odd height) determine the "subgrid" of
* image surrounding ipixel to be averaged.
* rotate (I) int containing degrees clockwise rotation
* (typically 0 or 30), i.e., imagine weights
* rotated clockwise and then averaging the
* image pixels "underneath" it now.
* --------------------------------------------------------------------------
* Returns: ( int ) 0-255 weighted average, or -1 for any error
* --------------------------------------------------------------------------
* Notes: o The rotation matrix used (when requested) is
* / x' \ / cos(theta) sin(theta)/a \ / x \
* | | = | | | |
* \ y' / \ -a*sin(theta) cos(theta) / \ y /
* where a=1 (current default) is the pixel (not screen)
* aspect ratio width:height, and theta is rotate (converted
* from degrees to radians). Then x=col,y=row are the integer
* pixel coords relative to the input center ipixel, and
* x',y' are rotated coords which aren't necessarily integer.
* The actual pixel used is the one nearest x',y'.
* ======================================================================= */
/* --- entry point --- */
int aawtpixel ( raster *image, int ipixel, raster *weights, int rotate )
{
/* -------------------------------------------------------------------------
Allocations and Declarations
-------------------------------------------------------------------------- */
int aaimgval = 0, /* weighted avg returned to caller */
totwts=0, sumwts=0; /* total of all wts, sum wts used */
int pixsz = image->pixsz, /* #bits per image pixel */
black1=1, black8=255, /* black for 1-bit, 8-bit pixels */
black = (pixsz==1? black1:black8), /* black value for our image */
scalefactor = (black1+black8-black), /* only scale 1-bit images */
iscenter = 0; /* set true if center pixel black */
/* --- grid dimensions and indexes --- */
int wtheight = weights->height, /* #rows in weight matrix */
wtwidth = weights->width, /* #cols in weight matrix */
imgheight = image->height, /* #rows in image */
imgwidth = image->width; /* #cols in image */
int wtrow, wtrow0 = wtheight/2, /* center row index for weights */
wtcol, wtcol0 = wtwidth/2, /* center col index for weights */
imgrow, imgrow0= ipixel/imgwidth, /* center row index for ipixel */
imgcol, imgcol0= ipixel-(imgrow0*imgwidth); /*center col for ipixel*/
/* --- rotated grid variables --- */
static int prevrotate = 0; /* rotate from previous call */
static double costheta = 1.0, /* cosine for previous rotate */
sintheta = 0.0; /* and sine for previous rotate */
double a = 1.0; /* default aspect ratio */
/* -------------------------------------------------------------------------
Initialization
-------------------------------------------------------------------------- */
/* --- refresh trig functions for rotate when it changes --- */
if ( rotate != prevrotate ) /* need new sine/cosine */
{ costheta = cos(((double)rotate)/57.29578); /*cos of rotate in radians*/
sintheta = sin(((double)rotate)/57.29578); /*sin of rotate in radians*/
prevrotate = rotate; } /* save current rotate as prev */
/* -------------------------------------------------------------------------
Calculate aapixel as weighted average over image points around ipixel
-------------------------------------------------------------------------- */
for ( wtrow=0; wtrow<wtheight; wtrow++ )
for ( wtcol=0; wtcol<wtwidth; wtcol++ )
{
/* --- allocations and declarations --- */
int wt = (int)getpixel(weights,wtrow,wtcol); /* weight for irow,icol */
int drow = wtrow - wtrow0, /* delta row offset from center */
dcol = wtcol - wtcol0; /* delta col offset from center */
int iscenter = 0; /* set true if center point black */
/* --- initialization --- */
totwts += wt; /* sum all weights */
/* --- rotate (if requested) --- */
if ( rotate != 0 ) /* non-zero rotation */
{
/* --- apply rotation matrix to (x=dcol,y=drow) --- */
double dx=(double)dcol, dy=(double)drow, dtemp; /* need floats */
dtemp = dx*costheta + dy*sintheta/a; /* save new dx' */
dy = -a*dx*sintheta + dy*costheta; /* dy becomes new dy' */
dx = dtemp; /* just for notational convenience */
/* --- replace original (drow,dcol) with nearest rotated point --- */
drow = (int)(dy+0.5); /* round dy for nearest row */
dcol = (int)(dx+0.5); /* round dx for nearest col */
} /* --- end-of-if(rotate!=0) --- */
/* --- select image pixel to be weighted --- */
imgrow = imgrow0 + drow; /*apply displacement to center row*/
imgcol = imgcol0 + dcol; /*apply displacement to center col*/
/* --- if pixel in bounds, accumulate weighted average --- */
if ( imgrow>=0 && imgrow<imgheight ) /* row is in bounds */
if ( imgcol>=0 && imgcol<imgwidth ) /* and col is in bounds */
{
/* --- accumulate weighted average --- */
int imgval = (int)getpixel(image,imgrow,imgcol); /* image value */
aaimgval += wt*imgval; /* weighted sum of image values */
sumwts += wt; /* and also sum weights used */
/* --- check if center image pixel black --- */
if ( drow==0 && dcol==0 ) /* this is center ipixel */
if ( imgval==black ) /* and it's black */
iscenter = 1; /* so set black center flag true */
} /* --- end-of-if(bounds checks ok) --- */
} /* --- end-of-for(irow,icol) --- */
if ( 0 && iscenter ) /* center point is black */
aaimgval = black8; /* so force average black */
else /* center point not black */
aaimgval = /* 0=white ... black */
((totwts/2 - 1) + scalefactor*aaimgval)/totwts; /* not /sumwts; */
/*end_of_job:*/
return ( aaimgval );
} /* --- end-of-function aawtpixel() --- */
#endif /* PART3 */
/* ---
* PART1
* ------ */
#if !defined(PARTS) || defined(PART1)
#ifdef DRIVER
/* ==========================================================================
* Function: main() driver for mimetex.c
* Purpose: emits a mime xbitmap or gif image of a LaTeX math expression
* entered either as
* (1) html query string from a browser (most typical), or
* (2) a query string from an html <form method="get">
* whose <input name="formdata"> (mostly for demo), or
* (3) command-line arguments (mostly to test).
* If no input supplied, expression defaults to "f(x)=x^2",
* treated as test (input method 3).
* If args entered on command-line (or if no input supplied),
* output is (usually) human-viewable ascii raster images on
* stdout rather than the usual mime xbitmaps or gif images.
* --------------------------------------------------------------------------
* Command-Line Arguments:
* When running mimeTeX from the command-line, rather than
* from a browser, syntax is
* ./mimetex [-d ] dump gif to stdout
* [expression expression, e.g., x^2+y^2,
* |-f input_file] or read expression from file
* [-m msglevel] verbosity of debugging output
* [-s fontsize] default fontsize, 0-5
* -d Rather than ascii debugging output, mimeTeX dumps the
* actual gif (or xbitmap) to stdout, e.g.,
* ./mimetex -d x^2+y^2 > expression.gif
* creates a gif file containing an image of x^2+y^2
* -f Reads expression from input_file, and automatically
* assumes -d switch. The input_file may contain the
* expression on one line or spread out over many lines.
* MimeTeX will concatanate all lines from input_file
* to construct one long expression. Blanks, tabs, and
* newlines will just be ignored.
* -m 0-99, controls verbosity level for debugging output
* (usually used only while testing code).
* -s Font size, 0-5. As usual, the font size can
* also be specified in the expression by a leading
* preamble terminated by $, e.g., 3$f(x)=x^2 displays
* f(x)=x^2 at font size 3. Default font size is 2.
* --------------------------------------------------------------------------
* Exits: 0=success, 1=some error
* --------------------------------------------------------------------------
* Notes: o For an executable that emits mime xbitmaps, compile as
* cc -DXBITMAP mimetex.c -lm -o mimetex.cgi
* or, alternatively, for an executable that emits gif images
* cc -DGIF mimetex.c gifsave.c -lm -o mimetex.cgi
* or for gif images with anti-aliasing
* cc -DGIF -DAA mimetex.c gifsave.c -lm -o mimetex.cgi
* See Notes at top of file for other compile-line -D options.
* o Move executable to your cgi-bin directory and either
* point your browser to it directly in the form
* http://www.yourdomain.com/cgi-bin/mimetex.cgi?3$f(x)=x^2
* or put a tag in your html document of the form
* <img src="../cgi-bin/mimetex.cgi?3$f(x)=x^2"
* border=0 align=absmiddle>
* where f(x)=x^2 (or any other expression) will be displayed
* either as a mime xbitmap or gif image (as per -D flag).
* ======================================================================= */
/* -------------------------------------------------------------------------
header files and other data
-------------------------------------------------------------------------- */
/* --- (additional) standard headers --- */
/* --- other data --- */
#ifdef DUMPENVIRON
extern char **environ; /* environment information */
#endif
/* -------------------------------------------------------------------------
globals for gif and png callback functions
-------------------------------------------------------------------------- */
GLOBAL(raster,*bitmap_raster,NULL); /* use 0/1 bitmap image or */
GLOBAL(intbyte,*colormap_raster,NULL); /* anti-aliased color indexes */
/* --- anti-aliasing flags (needed by GetPixel() as well as main()) --- */
#ifdef AA /* if anti-aliasing requested */
#define ISAAVALUE 1 /* turn flag on */
#else
#define ISAAVALUE 0 /* else turn flag off */
#endif
GLOBAL(int,isaa,ISAAVALUE); /* set anti-aliasing flag */
/* -------------------------------------------------------------------------
logging data structure, and default data to be logged
-------------------------------------------------------------------------- */
/* --- logging data structure --- */
#define logdata struct logdata_struct /* "typedef" for logdata_struct*/
logdata
{
/* -----------------------------------------------------------------------
environment variable name, max #chars to display, min msglevel to display
------------------------------------------------------------------------ */
char *name; /* environment variable name */
int maxlen; /* max #chars to display */
int msglevel; /* min msglevel to display data */
} ; /* --- end-of-logdata_struct --- */
/* --- data logged by mimeTeX --- */
STATIC logdata mimelog[]
#ifdef INITVALS
=
{
/* ------ variable ------ maxlen msglevel ----- */
{ "QUERY_STRING", 999, 4 },
{ "REMOTE_ADDR", 999, 3 },
{ "HTTP_REFERER", 999, 3 },
{ "REQUEST_URI", 999, 5 },
{ "HTTP_USER_AGENT", 999, 3 },
{ "HTTP_X_FORWARDED_FOR", 999, 3 },
{ NULL, -1, -1 } /* trailer record */
} /* --- end-of-mimelog[] --- */
#endif
;
/* -------------------------------------------------------------------------
messages
-------------------------------------------------------------------------- */
static char *copyright = /* copyright, gnu/gpl notice */
"+-----------------------------------------------------------------------+\n"
"|mimeTeX vers 1.63, Copyright(c) 2002-2006, John Forkosh Associates, Inc|\n"
"+-----------------------------------------------------------------------+\n"
"| mimeTeX is free software, licensed to you under terms of the GNU/GPL, |\n"
"| and comes with absolutely no warranty whatsoever. |\n"
"+-----------------------------------------------------------------------+";
static int maxmsgnum = 2; /* maximum msgtable[] index */
static char *msgtable[] = { /* messages referenced by [index] */
"\\red\\small\\rm\\fbox{\\array{" /* [0] is invalid_referer_msg */
"Please~read~www.forkosh.com/mimetex.html\\\\and~install~mimetex.cgi~"
"on~your~own~server.\\\\Thank~you,~John~Forkosh}}",
"\\red\\small\\rm\\fbox{\\array{" /* [1] */
"Please~provide~your~{\\tiny~HTTP-REFERER}~to~access~the~public\\\\"
"mimetex~server.~~Or~please~read~~www.forkosh.com/mimetex.html\\\\"
"and~install~mimetex.cgi~on~your~own~server.~~Thank~you,~John~Forkosh}}",
"\\red\\small\\rm\\fbox{\\array{" /* [2] */
"The~public~mimetex~server~is~for~testing.~~For~production,\\\\"
"please~read~~www.forkosh.com/mimetex.html~~and~install\\\\"
"mimetex.cgi~on~your~own~server.~~Thank~you,~John~Forkosh}}",
NULL } ; /* trailer */
/* --- entry point --- */
int main ( int argc, char *argv[]
#ifdef DUMPENVP
, char *envp[]
#endif
)
{
/* -------------------------------------------------------------------------
Allocations and Declarations
-------------------------------------------------------------------------- */
/* --- expression to be emitted --- */
static char exprbuffer[16385] = "f(x)=x^2"; /* expression to be processed */
char *expression = exprbuffer; /* ptr to expression */
int size = NORMALSIZE; /* default font size */
char *query = getenv("QUERY_STRING"); /* getenv("QUERY_STRING") result */
char *mimeprep(); /* preprocess expression */
int unescape_url(); /* convert %xx's to ascii chars */
int emitcache(); /* emit cached image if it exists */
int isquery = 0, /* true if input from QUERY_STRING */
isqempty = 0, /* true if query string empty */
isqforce = 0, /* true to force query emulation */
isqlogging = 0, /* true if logging in query mode */
isformdata = 0, /* true if input from html form */
isinmemory = 1, /* true to generate image in memory*/
isdumpimage = 0, /* true to dump image on stdout */
isdumpbuffer = 0; /* true to dump to memory buffer */
/* --- rasterization --- */
subraster *rasterize(), *sp=NULL; /* rasterize expression */
raster *border_raster(), *bp=NULL; /* put a border around raster */
int delete_subraster(); /* for clean-up at end-of-job */
int type_raster(), type_bytemap(), /* screen dump function prototypes */
xbitmap_raster(); /* mime xbitmap output function */
/* --- http_referer --- */
char *referer = REFERER; /* http_referer must contain this */
struct { char *referer; int msgnum; } /* http_referer can't contain this */
denyreferer[] = { /* referer table to deny access to */
#ifdef DENYREFERER
#include DENYREFERER /* e.g., {"",1}, for no referer */
#endif
{ NULL, -999 } }; /* trailer */
char *http_referer = getenv("HTTP_REFERER"); /* referer using mimeTeX */
int ishttpreferer = (http_referer==NULL?0:(*http_referer=='\000'?0:1));
int isstrstr(); /* search http_referer for referer */
int isinvalidreferer = 0; /* true for inavlid referer */
int norefmaxlen = NOREFMAXLEN; /*max query_string len if no referer*/
/* --- gif --- */
#if defined(GIF)
int GetPixel(); /* feed pixels to gifsave library */
int GIF_Create(),GIF_CompressImage(),GIF_Close(); /* prototypes for... */
void GIF_SetColor(),GIF_SetTransparent(); /* ...gifsave enntry points */
#endif
char *gif_outfile = (char *)NULL, /* gif output defaults to stdout */
gif_buffer[64000] = "\000", /* or gif written in memory buffer */
cachefile[256] = "\000", /* full path and name to cache file*/
*md5str(); /* md5 has of expression */
int maxage = 7200; /* max-age is two hours */
/* --- pbm/pgm (-g switch) --- */
int ispbmpgm = 0; /* true to write pbm/pgm file */
int type_pbmpgm(), ptype=0; /* entry point, graphic format */
char *pbm_outfile = (char *)NULL; /* output file defaults to stdout */
/* --- anti-aliasing --- */
intbyte *bytemap_raster = NULL, /* anti-aliased bitmap */
colors[256]; /* grayscale vals in bytemap */
int aalowpass(), aapnm(), /*lowpass filters for anti-aliasing*/
grayscale = 256; /* 0-255 grayscales in 8-bit bytes */
int ncolors=2, /* #colors (2=b&w) */
aacolormap(); /* build colormap from bytemap */
/* --- messages --- */
char logfile[256] = LOGFILE, /*log queries if msglevel>=LOGLEVEL*/
cachelog[256] = CACHELOG; /* cached image log in cachepath/ */
char *timestamp(); /* time stamp for logged messages */
int logger(); /* logs environ variables */
int ismonth(); /* check argv[0] for current month */
char *progname = (argc>0?argv[0]:"noname"); /* name program executed as */
char *dashes = /* separates logfile entries */
"--------------------------------------------------------------------------";
char *invalid_referer_msg = msgtable[0]; /* msg to invalid http_referer */
/* -------------------------------------------------------------------------
initialization
-------------------------------------------------------------------------- */
/* --- run optional system command string --- */
#ifdef SYSTEM
system(SYSTEM);
#endif
/* --- set global variables --- */
msgfp = stdout; /* for comamnd-line mode output */
isss = issupersampling; /* set supersampling flag */
gifSize = 0; /* signal that image not in memory */
shrinkfactor = shrinkfactors[NORMALSIZE]; /* set shrinkfactor */
/* ---
* check QUERY_STRING query for expression overriding command-line arg
* ------------------------------------------------------------------- */
if ( query != NULL ) /* check query string from environ */
if ( strlen(query) >= 1 ) /* caller gave us a query string */
{ strncpy(expression,query,16384); /* so use it as expression */
expression[16384] = '\000'; /* make sure it's null terminated */
isquery = 1; } /* and set isquery flag */
if ( !isquery ) /* empty query string */
{ char *host = getenv("HTTP_HOST"), /* additional getenv("") results */
*name = getenv("SERVER_NAME"), *addr = getenv("SERVER_ADDR");
if ( host!=NULL || name!=NULL || addr!=NULL ) /* assume http query */
{ isquery = 1; /* set flag to signal query */
strcpy(expression,"\\red\\small\\fbox{\\rm~no~query~string}"); }
isqempty = 1; /* signal empty query string */
} /* --- end-of-if(!isquery) --- */
/* ---
* process command-line input args (if not a query)
* ------------------------------------------------ */
if ( !isquery /* don't have an html query string */
|| ( /*isqempty &&*/ argc>1) ) /* or have command-line args */
{
char *argsignal = ARGSIGNAL, /* signals start of mimeTeX args */
stopsignal[32] = "--"; /* default Unix end-of-args signal */
int iarg=0, argnum=0, /*argv[] index for command-line args*/
exprarg = 0, /* argv[] index for expression */
infilearg = 0, /* argv[] index for infile */
nswitches = 0, /* number of -switches */
isstopsignal = 0, /* true after stopsignal found */
isstrict = 1/*iswindows*/, /* true for strict arg checking */
/*nb, windows has apache "x -3" bug*/
nargs=0, nbadargs=0, /* number of arguments, bad ones */
maxbadargs = (isstrict?0:1), /*assume query if too many bad args*/
isgoodargs = 0; /* true to accept command-line args*/
if ( argsignal != NULL ) /* if compiled with -DARGSIGNAL */
while ( argc > ++iarg ) /* check each argv[] for argsignal */
if ( !strcmp(argv[iarg],argsignal) ) /* check for exact match */
{ argnum = iarg; /* got it, start parsing next arg */
break; } /* stop looking for argsignal */
while ( argc > ++argnum ) /* check for switches and values, */
{
nargs++; /* count another command-line arg */
if ( strcmp(argv[argnum],stopsignal) == 0 ) /* found stopsignal */
{ isstopsignal = 1; /* so set stopsignal flag */
continue; } /* and get expression after it */
if ( !isstopsignal /* haven't seen stopsignal switch */
&& *argv[argnum] == '-' ) /* and have some '-' switch */
{
char *field = argv[argnum] + 1; /* ptr to char(s) following - */
char flag = tolower(*field); /* single char following '-' */
int arglen = strlen(field); /* #chars following - */
argnum++; /* arg following flag/switch is usually its value */
nswitches++; /* another switch on command line */
if ( isstrict && /* if strict checking then... */
!isthischar(flag,"g") && arglen!=1 ) /*must be single-char switch*/
{ nbadargs++; argnum--; } /* so ignore longer -xxx switch */
else /* process single-char -x switch */
switch ( flag ) { /* see what user wants to tell us */
/* --- ignore uninterpreted flag --- */
default: nbadargs++; argnum--; break;
/* --- adjustable program parameters (not checking input) --- */
case 'b': isdumpimage++; isdumpbuffer++; argnum--; break;
case 'd': isdumpimage++; argnum--; break;
case 'e': isdumpimage++; gif_outfile=argv[argnum]; break;
case 'f': isdumpimage++; infilearg=argnum; break;
case 'g': ispbmpgm++;
if ( arglen > 1 ) ptype = atoi(field+1); /* -g2 ==> ptype=2 */
if ( 1 || *argv[argnum]=='-' ) argnum--; /*next arg is -switch*/
else pbm_outfile = argv[argnum]; break; /*next arg is filename*/
case 'm': msglevel = atoi(argv[argnum]); break;
case 'o': istransparent = 0; argnum--; break;
case 'q': isqforce = 1; argnum--; break;
case 's': size = atoi(argv[argnum]); break;
} /* --- end-of-switch(flag) --- */
} /* --- end-of-if(*argv[argnum]=='-') --- */
else /* expression if arg not a -flag */
if ( infilearg == 0 ) /* no infile arg yet */
{ if ( exprarg != 0 ) nbadargs++; /* 2nd expression invalid */
exprarg = argnum; /* but take last expression */
/*infilearg = (-1);*/ } /* and set infilearg */
else nbadargs++; /* infile and expression invalid */
} /* --- end-of-while(argc>++argnum) --- */
if ( msglevel>=999 && msgfp!=NULL ) /* display command-line info */
{ fprintf(msgfp,"argc=%d, progname=%s, #args=%d, #badargs=%d\n",
argc,progname,nargs,nbadargs);
fprintf(msgfp,"cachepath=\"%.50s\" pathprefix=\"%.50s\"\n",
cachepath,pathprefix); }
/* ---
* decide whether command-line input overrides query_string
* -------------------------------------------------------- */
if ( isdumpimage > 2 ) nbadargs++; /* duplicate/conflicting -switch */
isgoodargs = ( !isstrict /*good if not doing strict checking*/
|| !isquery /* or if no query, must use args */
|| (nbadargs<nargs && nbadargs<=maxbadargs) ); /* bad args imply query */
/* ---
* take expression from command-line args
* -------------------------------------- */
if ( isgoodargs && exprarg > 0 /* good expression on command line */
&& infilearg <= 0 ) /* and not given in input file */
if ( !isquery /* no conflict if no query_string */
|| nswitches > 0 ) /* explicit -switch(es) also given */
{ strncpy(expression,argv[exprarg],16384); /*expression from command-line*/
expression[16384] = '\000'; /* make sure it's null terminated */
isquery = 0; } /* and not from a query_string */
/* ---
* or read expression from input file
* ---------------------------------- */
if ( isgoodargs && infilearg > 0 ) /* have a good -f arg */
{
FILE *infile = fopen(argv[infilearg],"r"); /* open input file for read */
if ( infile != (FILE *)NULL ) /* opened input file successfully */
{ char instring[2049]; /* line from file */
isquery = 0; /* file input, not a query_string */
*expression = '\000'; /* start expresion as empty string */
while ( fgets(instring,2048,infile) != (char *)NULL ) /* read till eof*/
strcat(expression,instring); /* concat line to end of expression*/
fclose ( infile ); } /*close input file after reading expression*/
} /* --- end-of-if(infilearg>0) --- */
/* ---
* check if emulating query (for testing)
* -------------------------------------- */
if ( isqforce ) isquery = 1; /* emulate query string processing */
/* ---
* check if emitting pbm/pgm graphic
* --------------------------------- */
if ( isgoodargs && ispbmpgm > 0 ) /* have a good -g arg */
if ( 1 && gif_outfile != NULL ) /* had an -e switch with file */
if ( *gif_outfile != '\000' ) /* make sure string isn't empty */
{ pbm_outfile = gif_outfile; /* use -e switch file for pbm/pgm */
gif_outfile = (char *)NULL; /* reset gif output file */
/*isdumpimage--;*/ } /* and decrement -e count */
} /* --- end-of-if(!isquery) --- */
/* ---
* check for <form> input
* ---------------------- */
if ( isquery ) /* must be <form method="get"> */
if ( !memcmp(expression,"formdata",8) ) /*must be <input name="formdata"> */
{ char *delim=strchr(expression,'='); /* find equal following formdata */
if ( delim != (char *)NULL ) /* found unescaped equal sign */
strcpy(expression,delim+1); /* so shift name= out of expression*/
while ( (delim=strchr(expression,'+')) != NULL ) /*unescaped plus sign*/
*delim = ' '; /* is "shorthand" for blank space */
/*unescape_url(expression,1);*/ /* convert unescaped %xx's to chars */
unescape_url(expression,0); /* convert all %xx's to chars */
unescape_url(expression,0); /* repeat */
msglevel = FORMLEVEL; /* msglevel for forms */
isformdata = 1; } /* set flag to signal form data */
else /* --- query, but not <form> input --- */
unescape_url(expression,0); /* convert _all_ %xx's to chars */
/* ---
* check queries for embedded prefixes signalling special processing
* ----------------------------------------------------------------- */
if ( isquery ) /* only check queries */
{
/* --- check for msglevel=###$ prefix --- */
if ( !memcmp(expression,"msglevel=",9) ) /* query has msglevel prefix */
{ char *delim=strchr(expression,'$'); /* find $ delim following msglevel*/
if ( delim != (char *)NULL ) /* check that we found delim */
{ *delim = '\000'; /* replace delim with null */
if ( seclevel <= 9 ) /* permit msglevel specification */
msglevel = atoi(expression+9); /* interpret ### in msglevel###$ */
strcpy(expression,delim+1); } } /* shift out prefix and delim */
/* --- next check for logfile=xxx$ prefix (must follow msglevel) --- */
if ( !memcmp(expression,"logfile=",8) ) /* query has logfile= prefix */
{ char *delim=strchr(expression,'$'); /* find $ delim following logfile=*/
if ( delim != (char *)NULL ) /* check that we found delim */
{ *delim = '\000'; /* replace delim with null */
if ( seclevel <= 3 ) /* permit logfile specification */
strcpy(logfile,expression+8); /* interpret xxx in logfile=xxx$ */
strcpy(expression,delim+1); } } /* shift out prefix and delim */
} /* --- end-of-if(isquery) --- */
/* ---
* log query (e.g., for debugging)
* ------------------------------- */
if ( isquery ) /* only log query_string's */
if ( msglevel >= LOGLEVEL /* check if logging */
&& seclevel <= 5 ) /* and if logging permitted */
if ( logfile != NULL ) /* if a logfile is given */
if ( *logfile != '\000' ) /*and if it's not an empty string*/
if ( (msgfp=fopen(logfile,"a")) /* open logfile for append */
!= NULL ) /* ignore logging if can't open */
{
/* --- default logging --- */
logger(msgfp,msglevel,expression,mimelog); /* log query */
/* --- additional debug logging (argv and environment) --- */
if ( msglevel >= 9 ) /* log environment */
{ int i; /*char name[999],*value;*/
fprintf(msgfp,"Command-line arguments...\n");
if ( argc < 1 ) /* no command-line args */
fprintf(msgfp," ...argc=%d, no argv[] variables\n",argc);
else
for ( i=0; i<argc; i++ ) /* display all argv[]'s */
fprintf(msgfp," argv[%d] = \"%s\"\n",i,argv[i]);
#ifdef DUMPENVP /* char *envp[] available for dump */
fprintf(msgfp,"Environment variables (using envp[])...\n");
if ( envp == (char **)NULL ) /* envp not provided */
fprintf(msgfp," ...envp[] environment variables not available\n");
else
for ( i=0; ; i++ ) /* display all envp[]'s */
if ( envp[i] == (char *)NULL ) break;
else fprintf(msgfp," envp[%d] = \"%s\"\n",i,envp[i]);
#endif /* --- DUMPENVP ---*/
#ifdef DUMPENVIRON /* skip what should be redundant output */
fprintf(msgfp,"Environment variables (using environ)...\n");
if ( environ == (char **)NULL ) /* environ not provided */
fprintf(msgfp," ...extern environ variables not available\n");
else
for ( i=0; ; i++ ) /*display environ[] and getenv()'s*/
if ( environ[i] == (char *)NULL ) break;
else {
strcpy(name,environ[i]); /* set up name for getenv() arg */
if ( (value=strchr(name,'=')) != NULL ) /* = delimits name */
{ *value = '\000'; /* got it, so null-terminate name */
value = getenv(name); } /* and look up name using getenv() */
else strcpy(name,"NULL"); /* missing = delim in environ[i] */
fprintf(msgfp,"environ[%d]: \"%s\"\n\tgetenv(%s) = \"%s\"\n",
i,environ[i],name,(value==NULL?"NULL":value));
} /* --- end-of-if/else --- */
#endif /* --- DUMPENVIRON ---*/
} /* --- end-of-if(msglevel>=9) --- */
/* --- close log file if no longer needed --- */
if ( msglevel < DBGLEVEL ) /* logging, but not debugging */
{ fprintf(msgfp,"%s\n",dashes); /* so log separator line, */
fclose(msgfp); /* close logfile immediately, */
msgfp = NULL; } /* and reset msgfp pointer */
else
isqlogging = 1; /* set query logging flag */
} /* --- end-of-if(msglevel>=LOGLEVEL) --- */
else /* couldn't open logfile */
msglevel = 0; /* can't emit messages */
/* ---
* prepend prefix to submitted expression
* -------------------------------------- */
if ( 1 || isquery ) /* queries or command-line */
if ( *exprprefix != '\000' ) /* we have a prefix string */
{ int npref = strlen(exprprefix); /* #chars in prefix */
memmove(expression+npref+1,expression,strlen(expression)+1); /*make room*/
memcpy(expression,exprprefix,npref); /* copy prefix into expression */
expression[npref] = '{'; /* followed by { */
strcat(expression,"}"); } /* and terminating } to balance { */
/* ---
* check if http_referer is allowed to use this image
* -------------------------------------------------- */
if ( isquery ) /* not relevant if "interactive" */
if ( referer != NULL ) /* nor if compiled w/o -DREFERER= */
if ( strcmp(referer,"month") != 0 ) /* nor if it's *only* "month" */
if ( http_referer != NULL ) /* nor if called "standalone" */
if ( !isstrstr(http_referer,referer,0) ) /* invalid http_referer */
{ expression = invalid_referer_msg; /* so give user error message */
isinvalidreferer = 1; } /* and signal invalid referer */
/* ---
* check if referer contains "month" signal
* ---------------------------------------- */
if ( isquery ) /* not relevant if "interactive" */
if ( referer != NULL ) /* nor if compiled w/o -DREFERER= */
if ( !isinvalidreferer ) /* nor if already invalid referer */
if ( strstr(referer,"month") != NULL ) /* month check requested */
if ( !ismonth(progname) ) /* not executed as mimetexJan-Dec */
{ expression = invalid_referer_msg; /* so give user error message */
isinvalidreferer = 1; } /* and signal invalid referer */
/* ---
* check if http_referer is to be denied access
* -------------------------------------------- */
if ( isquery ) /* not relevant if "interactive" */
if ( !isinvalidreferer ) /* nor if already invalid referer */
{ int iref=0, msgnum=(-999); /* denyreferer index, message# */
for ( iref=0; msgnum<0; iref++ ) { /* run through denyreferer[] table */
char *deny = denyreferer[iref].referer; /* referer to be denied */
if ( deny == NULL ) break; /* null signals end-of-table */
if ( msglevel>=999 && msgfp!=NULL ) /* debugging */
{fprintf(msgfp,"main> invalid iref=%d: deny=%s http_referer=%s\n",
iref,deny,(http_referer==NULL?"null":http_referer)); fflush(msgfp);}
if ( *deny == '\000' ) /* signal to check for no referer */
{ if ( http_referer == NULL ) /* http_referer not supplied */
msgnum = denyreferer[iref].msgnum; } /* so set message# */
else /* have referer to check for */
if ( http_referer != NULL ) /* and have referer to be checked */
if ( isstrstr(http_referer,deny,0) ) /* invalid http_referer */
msgnum = denyreferer[iref].msgnum; /* so set message# */
} /* --- end-of-for(iref) --- */
if ( msgnum >= 0 ) /* deny access to this referer */
{ if ( msgnum > maxmsgnum ) msgnum = 0; /* keep index within bounds */
expression = msgtable[msgnum]; /* set user error message */
isinvalidreferer = 1; } /* and signal invalid referer */
} /* --- end-of-if(!isinvalidreferer) --- */
/* --- also check maximum query_string length if no http_referer given --- */
if ( isquery ) /* not relevant if "interactive" */
if ( !isinvalidreferer ) /* nor if already invalid referer */
if ( !ishttpreferer ) /* no http_referer supplied */
if ( strlen(expression) > norefmaxlen ) /* query_string too long */
{ expression = invalid_referer_msg; /* set invalid http_referer message*/
isinvalidreferer = 1; } /* and signal invalid referer */
/* ---
* check for image caching
* ----------------------- */
if ( strstr(expression,"\\counter") != NULL /* can't cache \counter{} */
|| strstr(expression,"\\input") != NULL /* can't cache \input{} */
|| strstr(expression,"\\today") != NULL /* can't cache \today */
|| strstr(expression,"\\calendar") != NULL /* can't cache \calendar */
|| strstr(expression,"\\nocach") != NULL /* no caching requested */
|| isformdata /* don't cache user form input */
) { iscaching = 0; /* so turn caching off */
maxage = 5; } /* and set max-age to 5 seconds */
if ( isquery ) /* don't cache command-line images */
if ( iscaching ) /* image caching enabled */
{
/* --- set up path to cached image file --- */
char *md5hash = md5str(expression); /* md5 hash of expression */
if ( md5hash == NULL ) /* failed for some reason */
iscaching = 0; /* so turn off caching */
else
{
strcpy(cachefile,cachepath); /* start with (relative) path */
strcat(cachefile,md5hash); /* add md5 hash of expression */
strcat(cachefile,".gif"); /* finish with .gif extension */
gif_outfile = cachefile; /* signal GIF_Create() to cache */
/* --- emit mime content-type line --- */
if ( 0 ) /* now done in emitcache() */
{ fprintf( stdout, "Cache-Control: max-age=%d\n",maxage );
fprintf( stdout, "Content-type: image/gif\n\n" ); }
/* --- emit cached image if it already exists --- */
if ( emitcache(cachefile,maxage,0) > 0 ) /* cached image emitted */
goto end_of_job; /* so nothing else to do */
/* --- log caching request --- */
if ( msglevel >= 1 /* check if logging */
/*&& seclevel <= 5*/ ) /* and if logging permitted */
if ( cachelog != NULL ) /* if a logfile is given */
if ( *cachelog != '\000' ) /*and if it's not an empty string*/
{ char filename[256]; /* construct cachepath/cachelog */
FILE *filefp=NULL; /* fopen(filename) */
strcpy(filename,cachepath); /* start with (relative) path */
strcat(filename,cachelog); /* add cache log filename */
if ( (filefp=fopen(filename,"a")) /* open cache logfile for append */
!= NULL ) /* ignore logging if can't open */
{ int isreflogged = 0; /* set true if http_referer logged */
fprintf(filefp,"%s %s\n", /* timestamp, md5 file */
timestamp(TZDELTA,0),cachefile+strlen(cachepath)); /*skip path*/
fprintf(filefp,"%s\n",expression); /* expression in filename */
if ( http_referer != NULL ) /* show referer if we have one */
if ( *http_referer != '\000' ) /* and if not an empty string*/
{ int loglen = strlen(dashes); /* #chars on line in log file*/
char *refp = http_referer; /* line to be printed */
isreflogged = 1; /* signal http_referer logged*/
while ( 1 ) { /* printed in parts if needed*/
fprintf(filefp,"%.*s\n",loglen,refp); /* print a part */
if ( strlen(refp) <= loglen ) break; /* no more parts */
refp += loglen; } } /* bump ptr to next part */
if ( !isreflogged ) /* http_referer not logged */
fprintf(filefp,"http://none\n"); /* so log dummy referer line */
fprintf(filefp,"%s\n",dashes); /* separator line */
fclose(filefp); } /* close logfile immediately */
} /* --- end-of-if(cachelog!=NULL) --- */
} /* --- end-of-if/else(md5hash==NULL) --- */
} /* --- end-of-if(iscaching) --- */
/* ---
* emit copyright, gnu/gpl notice (if "interactive")
* ------------------------------------------------- */
if ( !isdumpimage ) /* don't mix ascii with image dump */
if ( (!isquery||isqlogging) && msgfp!=NULL ) /* called from command line */
fprintf(msgfp,"%s\n",copyright); /* display copyright, gnu/gpl info */
/* -------------------------------------------------------------------------
rasterize expression and put a border around it
-------------------------------------------------------------------------- */
/* --- preprocess expression, converting LaTeX constructs for mimeTeX --- */
expression = mimeprep(expression); /* preprocess expression */
/* --- double-check that we actually have an expression to rasterize --- */
if ( expression == NULL ) /* nothing to rasterize */
{ if ( (!isquery||isqlogging) && msgfp!=NULL ) /*emit error if not a query*/
fprintf(msgfp,"No expression to rasterize\n");
goto end_of_job; } /* and then quit */
/* --- rasterize expression --- */
if ( (sp = rasterize(expression,size)) == NULL ) /* failed to rasterize */
{ if ( (!isquery||isqlogging) && msgfp!=NULL ) /*emit error if not a query*/
fprintf(msgfp,"Failed to rasterize %s\n",expression);
if ( isquery ) sp = rasterize( /* or emit error raster if query */
"\\red\\rm~\\fbox{mimeTeX~failed~to~render\\\\your~expression}",1);
if ( sp == NULL ) goto end_of_job; } /* re-check for failure */
/* ---no border requested, but this adjusts width to multiple of 8 bits--- */
if ( issupersampling ) /* no border needed for gifs */
bp = sp->image; /* so just extract pixel map */
else /* for mime xbitmaps must have... */
bp = border_raster(sp->image,0,0,0,1); /* image width multiple of 8 bits */
sp->image = bitmap_raster = bp; /* global copy for gif,png output */
if ( ispbmpgm && ptype<2 ) /* -g switch or -g1 switch */
type_pbmpgm(bp,ptype,pbm_outfile); /* emit b/w pbm file */
/* -------------------------------------------------------------------------
generate anti-aliased bytemap from (bordered) bitmap
-------------------------------------------------------------------------- */
if ( isaa ) /* we want anti-aliased bitmap */
{
/* ---
* allocate bytemap and colormap as per width*height of bitmap
* ----------------------------------------------------------- */
int nbytes = (bp->width)*(bp->height); /*#bytes needed in byte,colormap*/
if ( isss ) /* anti-aliasing by supersampling */
bytemap_raster = (intbyte *)(bitmap_raster->pixmap); /*bytemap in raster*/
else /* need to allocate bytemap */
if ( aaalgorithm == 0 ) /* anti-aliasing not wanted */
isaa = 0; /* so signal no anti-aliasing */
else /* anti-aliasing wanted */
if ( (bytemap_raster = (intbyte *)malloc(nbytes)) /* malloc bytemap */
== NULL ) isaa = 0; /* reset flag if malloc failed */
if ( isaa ) /* have bytemap, so... */
if ( (colormap_raster = (intbyte *)malloc(nbytes)) /* malloc colormap */
== NULL ) isaa = 0; /* reset flag if malloc failed */
/* ---
* now generate anti-aliased bytemap and colormap from bitmap
* ---------------------------------------------------------- */
if ( isaa ) /*re-check that we're anti-aliasing*/
{
/* ---
* select anti-aliasing algorithm
* ------------------------------ */
if ( !isss ) /* generate bytemap for lowpass */
if ( aaalgorithm == 1 ) /* 1 for aalowpass() */
{ if ( aalowpass(bp,bytemap_raster,grayscale) /* my lowpass filter */
== 0 ) isaa = 0; } /*failed, so turn off anti-aliasing*/
else /* or 2 for aapnm() */
if ( aaalgorithm == 2 ) /*2 for netpbm pnmalias.c algorithm*/
{ if ( aapnm(bp,bytemap_raster,grayscale) /* pnmalias.c filter */
== 0 ) isaa = 0; } /*failed, so turn off anti-aliasing*/
else isaa = 0; /* unrecognized algorithm */
/* ---
* finally, generate colors and colormap
* ------------------------------------- */
if ( isaa ) { /* we have bytemap_raster */
ncolors = aacolormap(bytemap_raster,nbytes,colors,colormap_raster);
if ( ncolors < 2 ) /* failed */
{ isaa = 0; /* so turn off anti-aliasing */
ncolors = 2; } /* and reset for black&white */
} /* --- end-of-if(isaa) --- */
if ( isaa && ispbmpgm && ptype>1 ) { /* -g2 switch */
raster pbm_raster; /*construct arg for write_pbmpgm()*/
pbm_raster.width = bp->width; pbm_raster.height = bp->height;
pbm_raster.pixsz = 8; pbm_raster.pixmap = (pixbyte *)bytemap_raster;
type_pbmpgm(&pbm_raster,ptype,pbm_outfile); } /*write grayscale file*/
} /* --- end-of-if(isaa) --- */
} /* --- end-of-if(isaa) --- */
/* -------------------------------------------------------------------------
display results on msgfp if called from command line (usually for testing)
-------------------------------------------------------------------------- */
if ( (!isquery||isqlogging) || msglevel >= 99 ) /*command line or debuging*/
if ( !isdumpimage ) /* don't mix ascii with image dump */
{
/* ---
* display ascii image of rasterize()'s rasterized bitmap
* ------------------------------------------------------ */
if ( !isss ) /* no bitmap for supersampling */
{ fprintf(msgfp,"\nAscii dump of bitmap image...\n");
type_raster(bp,msgfp); } /* emit ascii image of raster */
/* ---
* display anti-aliasing results applied to rasterized bitmap
* ---------------------------------------------------------- */
if ( isaa ) /* if anti-aliasing applied */
{
int igray; /* colors[] index */
/* --- anti-aliased bytemap image --- */
if ( msgfp!=NULL && msglevel>=9 ) /* don't usually emit raw bytemap */
{ fprintf(msgfp,"\nHex dump of anti-aliased bytemap, " /*emit bytemap*/
"asterisks denote \"black\" bytes (value=%d)...\n",grayscale-1);
type_bytemap(bytemap_raster,grayscale,bp->width,bp->height,msgfp); }
/* --- colormap image --- */
fprintf(msgfp,"\nHex dump of colormap indexes, " /* emit colormap */
"asterisks denote \"black\" bytes (index=%d)...\n",ncolors-1);
type_bytemap(colormap_raster,ncolors,bp->width,bp->height,msgfp);
/* --- rgb values corresponding to colormap indexes */
fprintf(msgfp,"\nThe %d colormap indexes denote rgb values...",ncolors);
for ( igray=0; igray<ncolors; igray++ ) /* show colors[] values */
fprintf(msgfp,"%s%2x-->%3d", (igray%5?" ":"\n"),
igray,(int)(colors[ncolors-1]-colors[igray]));
fprintf(msgfp,"\n"); /* always needs a final newline */
} /* --- end-of-if(isaa) --- */
} /* --- end-of-if(!isquery||msglevel>=9) --- */
/* -------------------------------------------------------------------------
emit xbitmap or gif image, and exit
-------------------------------------------------------------------------- */
if ( isquery /* called from browser (usual) */
|| (isdumpimage && !ispbmpgm) /* or to emit gif dump of image */
|| msglevel >= 99 ) /* or for debugging */
{
int igray = 0; /* grayscale index */
#if defined(GIF) /* compiled to emit gif */
/* ------------------------------------------------------------------------
emit GIF image
------------------------------------------------------------------------- */
/* --- don't use memory buffer if outout file given --- */
if ( gif_outfile != NULL ) isinmemory = 0; /* reset memory buffer flag */
/* --- emit mime content-type line --- */
if ( !isdumpimage /* don't mix ascii with image dump */
&& !isinmemory /* done below if in memory */
&& !iscaching ) /* done by emitcache() if caching */
{ fprintf( stdout, "Cache-Control: max-age=%d\n",maxage );
/*fprintf( stdout, "Expires: Fri, 31 Oct 2003 23:59:59 GMT\n" );*/
/*fprintf( stdout, "Last-Modified: Wed, 15 Oct 2003 01:01:01 GMT\n" );*/
fprintf( stdout, "Content-type: image/gif\n\n" ); }
/* --- write output to memory buffer, possibly for testing --- */
if ( isinmemory /* want gif written to memory */
|| isdumpbuffer ) /*or dump memory buffer for testing*/
if ( gif_outfile == NULL ) /* and don't already have a file */
{ *gif_buffer = '\000'; /* init buffer as empty string */
memset(gif_buffer,0,4096); /* zero out buffer */
gif_outfile = gif_buffer; /* and point outfile to buffer */
if ( isdumpbuffer ) /* buffer dump test requested */
isdumpbuffer = 999; } /* so signal dumping to buffer */
/* --- initialize gifsave library and colors --- */
if ( msgfp!=NULL && msglevel>=999 )
{ fprintf(msgfp,"main> calling GIF_Create(*,%d,%d,%d,8)\n",
bp->width,bp->height,ncolors); fflush(msgfp); }
while ( 1 ) /* init gifsave lib, and retry if caching fails */
{ int status = GIF_Create(gif_outfile, bp->width,bp->height, ncolors, 8);
if ( status == 0 ) break; /* continue if succeeded */
if ( iscaching == 0 ) goto end_of_job; /* quit if failed */
iscaching = 0; /* retry without cache file */
isdumpbuffer = 0; /* reset isdumpbuffer signal */
if ( isquery ) isinmemory = 1; /* force in-memory image generation*/
if ( isinmemory ) { /* using memory buffer */
gif_outfile = gif_buffer; /* emit images to memory buffer */
*gif_outfile = '\000'; } /* empty string signals buffer */
else { /* or */
gif_outfile = (char *)NULL; /* emit images to stdout */
fprintf( stdout, "Cache-Control: max-age=%d\n",maxage );
fprintf( stdout, "Content-type: image/gif\n\n" ); }
} /* --- end-of-while(1) --- */
GIF_SetColor(0,bgred,bggreen,bgblue); /* background white if all 255 */
if ( !isaa ) /* just b&w if not anti-aliased */
{ GIF_SetColor(1,fgred,fggreen,fgblue); /* foreground black if all 0 */
colors[0]='\000'; colors[1]='\001'; } /* and set 2 b&w color indexes */
else /* set grayscales for anti-aliasing */
/* --- anti-aliased, so call GIF_SetColor() for each colors[] --- */
for ( igray=1; igray<ncolors; igray++ ) /* for colors[] values */
{
/*--- gfrac goes from 0 to 1.0, as igray goes from 0 to ncolors-1 ---*/
double gfrac = ((double)colors[igray])/((double)colors[ncolors-1]);
/* --- r,g,b components go from background to foreground color --- */
int red = iround(((double)bgred) +gfrac*((double)(fgred-bgred))),
green= iround(((double)bggreen)+gfrac*((double)(fggreen-bggreen))),
blue = iround(((double)bgblue) +gfrac*((double)(fgblue-bgblue)));
/* --- set color index number igray to rgb values gray,gray,gray --- */
GIF_SetColor(igray, red,green,blue); /*set gray,grayer,...,0=black*/
} /* --- end-of-for(igray) --- */
/* --- set gif color#0 (background) transparent --- */
if ( istransparent ) /* transparent background wanted */
GIF_SetTransparent(0); /* set transparent background */
if (msgfp!=NULL && msglevel>=9) fflush(msgfp); /*flush debugging output*/
/* --- emit compressed gif image (to stdout or cache file) --- */
GIF_CompressImage(0, 0, -1, -1, GetPixel); /* emit gif */
GIF_Close(); /* close file */
if ( msgfp!=NULL && msglevel>=9 )
{ fprintf(msgfp,"main> created gifSize=%d\n", gifSize);
fflush(msgfp); }
/* --- may need to emit image from cached file or from memory --- */
if ( isquery /* have an actual query string */
|| isdumpimage /* or dumping image */
|| msglevel >= 99 ) { /* or debugging */
int maxage2 = (isdumpimage?(-1):maxage); /* no headers if dumping image */
if ( iscaching ) /* caching enabled */
emitcache(cachefile,maxage2,0); /* cached image (hopefully) emitted*/
else if ( isinmemory ) /* or emit image from memory buffer*/
emitcache(gif_buffer,maxage2,1); } /* emitted from memory buffer */
/* --- for testing, may need to write image buffer to file --- */
if ( isdumpbuffer > 99 ) /* gif image in memory buffer */
if ( gifSize > 0 ) /* and it's not an empty buffer */
{ FILE *dumpfp = fopen("mimetex.gif","wb"); /* dump to mimetex.gif */
if ( dumpfp != NULL ) /* file opened successfully */
{ fwrite(gif_buffer,sizeof(unsigned char),gifSize,dumpfp); /*write*/
fclose(dumpfp); } /* and close file */
} /* --- end-of-if(isdumpbuffer>99) --- */
#else
/* ------------------------------------------------------------------------
emit mime XBITMAP image
------------------------------------------------------------------------- */
xbitmap_raster(bp,stdout); /* default emits mime xbitmap */
#endif
} /* --- end-of-if(isquery) --- */
/* --- exit --- */
end_of_job:
if ( !isss ) /*bytemap raster in sp for supersamp*/
if ( bytemap_raster != NULL ) free(bytemap_raster);/*free bytemap_raster*/
if (colormap_raster != NULL )free(colormap_raster); /*and colormap_raster*/
if ( 0 && gif_buffer != NULL ) free(gif_buffer); /* free malloced buffer */
if ( 1 && sp != NULL ) delete_subraster(sp); /* and free expression */
if ( msgfp != NULL /* have message/log file open */
&& msgfp != stdout ) /* and it's not stdout */
{ fprintf(msgfp,"mimeTeX> successful end-of-job at %s\n",
timestamp(TZDELTA,0));
fprintf(msgfp,"%s\n",dashes); /* so log separator line */
fclose(msgfp); } /* and close logfile */
/* --- dump memory leaks in debug window if in MS VC++ debug mode --- */
#if defined(_CRTDBG_MAP_ALLOC)
_CrtDumpMemoryLeaks();
#endif
/* --- exit() if not running as Windows DLL (see CreateGifFromEq()) --- */
#if !defined(_USRDLL)
exit ( 0 );
#endif
} /* --- end-of-function main() --- */
/* ==========================================================================
* Function: CreateGifFromEq ( expression, gifFileName )
* Purpose: shortcut method to create GIF file for expression,
* with antialising and all other capabilities
* --------------------------------------------------------------------------
* Arguments: expression (I) char *ptr to null-terminated string
* containing LaTeX expression to be rendred
* gifFileName (I) char *ptr to null-terminated string
* containing name of output gif file
* --------------------------------------------------------------------------
* Returns: ( int ) exit value from main (0 if successful)
* --------------------------------------------------------------------------
* Notes: o This function is the entry point when mimeTeX is built
* as a Win32 DLL rather then a standalone app or CGI
* o Contributed to mimeTeX by Shital Shah. See his homepage
* http://www.shitalshah.com
* o Shital discusses the mimeTeX Win32 DLL project at
* http://www.codeproject.com/dotnet/Eq2Img.asp
* and you can download his latest code from
* http://www.shitalshah.com/dev/eq2img_all.zip
* ======================================================================= */
/* --- include function to expose Win32 DLL to outside world --- */
#if defined(_USRDLL)
extern _declspec(dllexport)int _cdecl
CreateGifFromEq ( char *expression, char *gifFileName );
#endif
/* --- entry point --- */
int CreateGifFromEq ( char *expression, char *gifFileName )
{
/* -------------------------------------------------------------------------
Allocations and Declarations
-------------------------------------------------------------------------- */
int main(); /* main() akways returns an int */
/* --- set constants --- */
int argc = 4; /* count of args supplied to main() */
char *argv[5] = /* command line args to run with -e option */
{ "MimeTeXWin32DLL", "-e", /* constant args */
/*gifFileName, expression,*/ NULL, NULL, NULL };
/* --- set argv[]'s not computable at load time --- */
argv[2] = gifFileName; /* args are -e gifFileName */
argv[3] = expression; /* and now -e gifFileName expression */
/* -------------------------------------------------------------------------
Run mimeTeX in command-line mode with -e (export) option, and then return
-------------------------------------------------------------------------- */
return main ( argc, argv
#ifdef DUMPENVP
, NULL
#endif
) ;
} /* --- end-of-function CreateGifFromEq() --- */
/* ==========================================================================
* Function: isstrstr ( char *string, char *snippets, int iscase )
* Purpose: determine whether any substring of 'string'
* matches any of the comma-separated list of 'snippets',
* ignoring case if iscase=0.
* --------------------------------------------------------------------------
* Arguments: string (I) char * containing null-terminated
* string that will be searched for
* any one of the specified snippets
* snippets (I) char * containing null-terminated,
* comma-separated list of snippets
* to be searched for in string
* iscase (I) int containing 0 for case-insensitive
* comparisons, or 1 for case-sensitive
* --------------------------------------------------------------------------
* Returns: ( int ) 1 if any snippet is a substring of
* string, 0 if not
* --------------------------------------------------------------------------
* Notes: o
* ======================================================================= */
/* --- entry point --- */
int isstrstr ( char *string, char *snippets, int iscase )
{
/* -------------------------------------------------------------------------
Allocations and Declarations
-------------------------------------------------------------------------- */
int status = 0; /*1 if any snippet found in string*/
char snip[99], *snipptr = snippets, /* munge through each snippet */
delim = ',', *delimptr = NULL; /* separated by delim's */
char stringcp[999], *cp = stringcp; /*maybe lowercased copy of string*/
/* -------------------------------------------------------------------------
initialization
-------------------------------------------------------------------------- */
/* --- arg check --- */
if ( string==NULL || snippets==NULL ) goto end_of_job; /* missing arg */
if ( *string=='\000' || *snippets=='\000' ) goto end_of_job; /* empty arg */
/* --- copy string and lowercase it if case-insensitive --- */
strcpy(stringcp,string); /* local copy of string */
if ( !iscase ) /* want case-insensitive compares */
for ( cp=stringcp; *cp != '\000'; cp++ ) /* so for each string char */
if ( isupper(*cp) ) *cp = tolower(*cp); /*lowercase any uppercase chars*/
/* -------------------------------------------------------------------------
extract each snippet and see if it's a substring of string
-------------------------------------------------------------------------- */
while ( snipptr != NULL ) /* while we still have snippets */
{
/* --- extract next snippet --- */
if ( (delimptr = strchr(snipptr,delim)) /* locate next comma delim */
== NULL ) /*not found following last snippet*/
{ strcpy(snip,snipptr); /* local copy of last snippet */
snipptr = NULL; } /* signal end-of-string */
else /* snippet ends just before delim */
{ int sniplen = (int)(delimptr-snipptr) - 1; /* #chars in snippet */
memcpy(snip,snipptr,sniplen); /* local copy of snippet chars */
snip[sniplen] = '\000'; /* null-terminated snippet */
snipptr = delimptr + 1; } /* next snippet starts after delim */
/* --- lowercase snippet if case-insensitive --- */
if ( !iscase ) /* want case-insensitive compares */
for ( cp=snip; *cp != '\000'; cp++ ) /* so for each snippet char */
if ( isupper(*cp) ) *cp=tolower(*cp); /*lowercase any uppercase chars*/
/* --- check if snippet in string --- */
if ( strstr(stringcp,snip) != NULL ) /* found snippet in string */
{ status = 1; /* so reset return status */
break; } /* no need to check any further */
} /* --- end-of-while(*snipptr!=0) --- */
end_of_job: return ( status ); /*1 if snippet found in list, else 0*/
} /* --- end-of-function isstrstr() --- */
/* ==========================================================================
* Function: ismonth ( char *month )
* Purpose: returns 1 if month contains current month "jan"..."dec".
* --------------------------------------------------------------------------
* Arguments: month (I) char * containing null-terminated string
* in which "jan"..."dec" is (putatively)
* contained as a substring.
* --------------------------------------------------------------------------
* Returns: ( int ) 1 if month contains current month,
* 0 otherwise
* --------------------------------------------------------------------------
* Notes: o There's a three day "grace period", e.g., Dec 3 mtaches Nov.
* ======================================================================= */
/* --- entry point --- */
int ismonth ( char *month )
{
/* -------------------------------------------------------------------------
Allocations and Declarations
-------------------------------------------------------------------------- */
int isokay = 0; /*1 if month contains current month*/
/*long time_val = 0L;*/ /* binary value returned by time() */
time_t time_val = (time_t)(0); /* binary value returned by time() */
struct tm *tmstruct=(struct tm *)NULL, *localtime(); /* interpret time_val */
int imonth, mday; /* current month 1-12 and day 1-31 */
int ngrace = 3; /* grace period */
char lcmonth[128]="\000"; int i=0; /* lowercase month */
static char *months[] = /* month must contain current one */
{"dec","jan","feb","mar","apr","may","jun",
"jul","aug","sep","oct","nov","dec","jan"};
/* -------------------------------------------------------------------------
get current date:time info, and check month
-------------------------------------------------------------------------- */
/* --- lowercase input month --- */
if ( month != NULL ) /* check that we got input */
for ( i=0; i<120 && *month!='\000'; i++,month++ ) /* go thru month chars */
lcmonth[i] = tolower(*month); /* lowerase each char in month */
if ( i < 2 ) goto end_of_job; /* must be invalid input */
lcmonth[i] = '\000'; /* null-terminate lcmonth[] */
/* --- get current date:time --- */
time((time_t *)(&time_val)); /* get date and time */
tmstruct = localtime((time_t *)(&time_val)); /* interpret time_val */
/* --- month and day --- */
imonth = 1 + (int)(tmstruct->tm_mon); /* 1=jan ... 12=dec */
mday = (int)(tmstruct->tm_mday); /* 1-31 */
if ( imonth<1 || imonth>12 /* quit if month out-of-range */
|| mday<0 || mday>31 ) goto end_of_job; /* or date out of range */
/* --- check input month against current date --- */
if ( strstr(lcmonth,months[imonth]) != NULL ) isokay = 1; /* current month */
if ( mday <= ngrace ) /* 1-3 within grace period */
if ( strstr(lcmonth,months[imonth-1]) != NULL ) isokay = 1; /* last month */
if ( mday >= 31-ngrace ) /* 28-31 within grace period */
if ( strstr(lcmonth,months[imonth+1]) != NULL ) isokay = 1; /* next month */
end_of_job:
return ( isokay ); /*1 if month contains current month*/
} /* --- end-of-function ismonth() --- */
/* ==========================================================================
* Functions: int unescape_url ( char *url, int isescape )
* char x2c ( char *what )
* Purpose: unescape_url replaces 3-character sequences %xx in url
* with the single character represented by hex xx.
* x2c returns the single character represented by hex xx
* passed as a 2-character sequence in what.
* --------------------------------------------------------------------------
* Arguments: url (I) char * containing null-terminated
* string with embedded %xx sequences
* to be converted.
* isescape (I) int containing 1 to _not_ unescape
* \% sequences (0 would be NCSA default)
* what (I) char * whose first 2 characters are
* interpreted as ascii representations
* of hex digits.
* --------------------------------------------------------------------------
* Returns: ( int ) unescape_url always returns 0.
* ( char ) x2c returns the single char
* corresponding to hex xx passed in what.
* --------------------------------------------------------------------------
* Notes: o These two functions were taken verbatim from util.c in
* ftp://ftp.ncsa.uiuc.edu/Web/httpd/Unix/ncsa_httpd/cgi/ncsa-default.tar.Z
* o Not quite "verbatim" -- I added the "isescape logic" 4-Dec-03
* so unescape_url() can be safely applied to input which may or
* may not have been url-encoded.
* ======================================================================= */
/* --- entry point --- */
int unescape_url(char *url, int isescape) {
int x=0,y=0,prevescape=0,gotescape=0;
char x2c();
static char *hex="0123456789ABCDEFabcdef";
for(;url[y];++x,++y) {
gotescape = prevescape;
prevescape = (url[x]=='\\');
if((url[x] = url[y]) == '%')
if(!isescape || !gotescape)
if(isthischar(url[y+1],hex)
&& isthischar(url[y+2],hex))
{ url[x] = x2c(&url[y+1]);
y+=2; }
}
url[x] = '\0';
return 0;
} /* --- end-of-function unescape_url() --- */
/* --- entry point --- */
char x2c(char *what) {
char digit;
digit = (what[0] >= 'A' ? ((what[0] & 0xdf) - 'A')+10 : (what[0] - '0'));
digit *= 16;
digit += (what[1] >= 'A' ? ((what[1] & 0xdf) - 'A')+10 : (what[1] - '0'));
return(digit);
} /* --- end-of-function x2c() --- */
/* ==========================================================================
* Function: logger ( fp, msglevel, message, logvars )
* Purpose: Logs the environment variables specified in logvars
* to fp if their msglevel is >= the passed msglevel.
* --------------------------------------------------------------------------
* Arguments: fp (I) FILE * to file containing log
* msglevel (I) int containing logging message level
* message (I) char * to optional message, or NULL
* logvars (I) logdata * to array of environment variables
* to be logged
* --------------------------------------------------------------------------
* Returns: ( int ) number of variables from logvars
* that were actually logged
* --------------------------------------------------------------------------
* Notes: o
* ======================================================================= */
/* --- entry point --- */
int logger ( FILE *fp, int msglevel, char *message, logdata *logvars )
{
/* -------------------------------------------------------------------------
Allocations and Declarations
-------------------------------------------------------------------------- */
int ilog=0, nlogged=0; /* logvars[] index, #vars logged */
char *timestamp(); /* timestamp logged */
char *value = NULL; /* getenv(name) to be logged */
/* -------------------------------------------------------------------------
Log each variable
-------------------------------------------------------------------------- */
fprintf(fp,"%s\n",timestamp(TZDELTA,0)); /*emit timestamp before first var*/
if ( message != NULL ) /* optional message supplied */
fprintf(fp," MESSAGE = %s\n",message); /* emit caller-supplied message */
if ( logvars != (logdata *)NULL ) /* have logvars */
for ( ilog=0; logvars[ilog].name != NULL; ilog++ ) /* till end-of-table */
if ( msglevel >= logvars[ilog].msglevel ) /* check msglevel for this var */
if ( (value=getenv(logvars[ilog].name)) /* getenv(name) to be logged */
!= NULL ) /* check that name exists */
{
fprintf(fp," %s = %.*s\n", /* emit variable name = value */
logvars[ilog].name,logvars[ilog].maxlen,value);
nlogged++; /* bump #vars logged */
} /* --- end-of-for(ilog) --- */
return ( nlogged ); /* back to caller */
} /* --- end-of-function logger() --- */
/* ==========================================================================
* Function: emitcache ( cachefile, maxage, isbuffer )
* Purpose: dumps bytes from cachefile to stdout
* --------------------------------------------------------------------------
* Arguments: cachefile (I) pointer to null-terminated char string
* containing full path to file to be dumped,
* or contains buffer of bytes to be dumped
* maxage (I) int containing maxage. in seconds, for
* http header, or -1 to not emit headers
* isbuffer (I) 1 if cachefile is buffer of bytes to be
* dumped
* --------------------------------------------------------------------------
* Returns: ( int ) #bytes dumped (0 signals error)
* --------------------------------------------------------------------------
* Notes: o
* ======================================================================= */
/* --- entry point --- */
int emitcache ( char *cachefile, int maxage, int isbuffer )
{
/* -------------------------------------------------------------------------
Allocations and Declarations
-------------------------------------------------------------------------- */
int nbytes=gifSize, readcachefile(); /* read cache file */
FILE *emitptr = stdout; /* emit cachefile to stdout */
unsigned char buffer[64000]; /* bytes from cachefile */
unsigned char *buffptr = buffer; /* ptr to buffer */
/* -------------------------------------------------------------------------
initialization
-------------------------------------------------------------------------- */
/* --- check that files opened okay --- */
if ( emitptr == (FILE *)NULL ) /* failed to open emit file */
goto end_of_job; /* so return 0 bytes to caller */
/* --- read the file if necessary --- */
if ( isbuffer ) /* cachefile is buffer */
buffptr = (unsigned char *)cachefile; /* so reset buffer pointer */
else /* cachefile is file name */
if ( (nbytes = readcachefile(cachefile,buffer)) /* read the file */
< 1 ) goto end_of_job; /* quit if file not read */
/* --- first emit http headers if requested --- */
if ( maxage >= 0 ) /* caller wants http headers */
{ /* --- emit mime content-type line --- */
fprintf( emitptr, "Cache-Control: max-age=%d\n",maxage );
fprintf( emitptr, "Content-Length: %d\n",nbytes );
fprintf( emitptr, "Content-type: image/gif\n\n" ); }
/* -------------------------------------------------------------------------
set stdout to binary mode (for Windows)
-------------------------------------------------------------------------- */
/* emitptr = fdopen(STDOUT_FILENO,"wb"); */ /* doesn't work portably, */
#ifdef WINDOWS /* so instead... */
#ifdef HAVE_SETMODE /* prefer (non-portable) setmode() */
if ( setmode ( fileno (stdout), O_BINARY) /* windows specific call */
== -1 ) ; /* handle error */ /* sets stdout to binary mode */
#else /* setmode() not available */
#if 1
freopen ("CON", "wb", stdout); /* freopen() stdout binary */
#else
stdout = fdopen (STDOUT_FILENO, "wb"); /* fdopen() stdout binary */
#endif
#endif
#endif
/* -------------------------------------------------------------------------
emit bytes from cachefile
-------------------------------------------------------------------------- */
/* --- write bytes to stdout --- */
if ( fwrite(buffptr,sizeof(unsigned char),nbytes,emitptr) /* write buffer */
< nbytes ) /* failed to write all bytes */
nbytes = 0; /* reset total count to 0 */
end_of_job:
return ( nbytes ); /* back with #bytes emitted */
} /* --- end-of-function emitcache() --- */
/* ==========================================================================
* Function: readcachefile ( cachefile, buffer )
* Purpose: read cachefile into buffer
* --------------------------------------------------------------------------
* Arguments: cachefile (I) pointer to null-terminated char string
* containing full path to file to be read
* buffer (O) pointer to unsigned char string
* returning contents of cachefile
* (max 64000 bytes)
* --------------------------------------------------------------------------
* Returns: ( int ) #bytes read (0 signals error)
* --------------------------------------------------------------------------
* Notes: o
* ======================================================================= */
/* --- entry point --- */
int readcachefile ( char *cachefile, unsigned char *buffer )
{
/* -------------------------------------------------------------------------
Allocations and Declarations
-------------------------------------------------------------------------- */
FILE *cacheptr = fopen(cachefile,"rb"); /*open cachefile for binary read*/
unsigned char cachebuff[64]; /* bytes from cachefile */
int buflen = 32, /* #bytes we try to read from file */
nread = 0, /* #bytes actually read from file */
maxbytes = 64000, /* max #bytes returned in buffer */
nbytes = 0; /* total #bytes read */
/* -------------------------------------------------------------------------
initialization
-------------------------------------------------------------------------- */
/* --- check that files opened okay --- */
if ( cacheptr == (FILE *)NULL ) goto end_of_job; /*failed to open cachefile*/
/* --- check that output buffer provided --- */
if ( buffer == (unsigned char *)NULL ) goto end_of_job; /* no buffer */
/* -------------------------------------------------------------------------
read bytes from cachefile
-------------------------------------------------------------------------- */
while ( 1 )
{
/* --- read bytes from cachefile --- */
nread = fread(cachebuff,sizeof(unsigned char),buflen,cacheptr); /* read */
if ( nbytes + nread > maxbytes ) /* block too big for buffer */
nread = maxbytes - nbytes; /* so truncate it */
if ( nread < 1 ) break; /* no bytes left in cachefile */
/* --- store bytes in buffer --- */
memcpy(buffer+nbytes,cachebuff,nread); /* copy current block to buffer */
/* --- ready to read next block --- */
nbytes += nread; /* bump total #bytes emitted */
if ( nread < buflen ) break; /* no bytes left in cachefile */
if ( nbytes >= maxbytes ) break; /* avoid buffer overflow */
} /* --- end-of-while(1) --- */
end_of_job:
if ( cacheptr != NULL ) fclose(cacheptr); /* close file if opened */
return ( nbytes ); /* back with #bytes emitted */
} /* --- end-of-function readcachefile() --- */
/* ==========================================================================
* Function: md5str ( instr )
* Purpose: returns null-terminated character string containing
* md5 hash of instr (input string)
* --------------------------------------------------------------------------
* Arguments: instr (I) pointer to null-terminated char string
* containing input string whose md5 hash
* is desired
* --------------------------------------------------------------------------
* Returns: ( char * ) ptr to null-terminated 32-character
* md5 hash of instr
* --------------------------------------------------------------------------
* Notes: o Other md5 library functions are included below.
* They're all taken from Christophe Devine's code,
* which (as of 04-Aug-2004) is available from
* http://www.cr0.net:8040/code/crypto/md5/
* o The P,F,S macros in the original code are replaced
* by four functions P1()...P4() to accommodate a problem
* with Compaq's vax/vms C compiler.
* ======================================================================= */
/* --- #include "md5.h" --- */
#ifndef uint8
#define uint8 unsigned char
#endif
#ifndef uint32
#define uint32 unsigned long int
#endif
typedef struct
{ uint32 total[2];
uint32 state[4];
uint8 buffer[64];
} md5_context;
void md5_starts( md5_context *ctx );
void md5_update( md5_context *ctx, uint8 *input, uint32 length );
void md5_finish( md5_context *ctx, uint8 digest[16] );
/* --- md5.h --- */
#define GET_UINT32(n,b,i) \
{ (n) = ( (uint32) (b)[(i) ] ) \
| ( (uint32) (b)[(i) + 1] << 8 ) \
| ( (uint32) (b)[(i) + 2] << 16 ) \
| ( (uint32) (b)[(i) + 3] << 24 ); }
#define PUT_UINT32(n,b,i) \
{ (b)[(i) ] = (uint8) ( (n) ); \
(b)[(i) + 1] = (uint8) ( (n) >> 8 ); \
(b)[(i) + 2] = (uint8) ( (n) >> 16 ); \
(b)[(i) + 3] = (uint8) ( (n) >> 24 ); }
/* --- P,S,F macros defined as functions --- */
void P1(uint32 *X,uint32 *a,uint32 b,uint32 c,uint32 d,int k,int s,uint32 t)
{ *a += (uint32)(d ^ (b & (c ^ d))) + X[k] + t;
*a = ((*a<<s) | ((*a & 0xFFFFFFFF) >> (32-s))) + b;
return; }
void P2(uint32 *X,uint32 *a,uint32 b,uint32 c,uint32 d,int k,int s,uint32 t)
{ *a += (uint32)(c ^ (d & (b ^ c))) + X[k] + t;
*a = ((*a<<s) | ((*a & 0xFFFFFFFF) >> (32-s))) + b;
return; }
void P3(uint32 *X,uint32 *a,uint32 b,uint32 c,uint32 d,int k,int s,uint32 t)
{ *a += (uint32)(b ^ c ^ d) + X[k] + t;
*a = ((*a<<s) | ((*a & 0xFFFFFFFF) >> (32-s))) + b;
return; }
void P4(uint32 *X,uint32 *a,uint32 b,uint32 c,uint32 d,int k,int s,uint32 t)
{ *a += (uint32)(c ^ (b | ~d)) + X[k] + t;
*a = ((*a<<s) | ((*a & 0xFFFFFFFF) >> (32-s))) + b;
return; }
/* --- entry point (this one little stub written by me)--- */
char *md5str( char *instr )
{ static char outstr[64];
unsigned char md5sum[16];
md5_context ctx;
int j;
md5_starts( &ctx );
md5_update( &ctx, (uint8 *)instr, strlen(instr) );
md5_finish( &ctx, md5sum );
for( j=0; j<16; j++ )
sprintf( outstr + j*2, "%02x", md5sum[j] );
outstr[32] = '\000';
return ( outstr ); }
/* --- entry point (all md5 functions below by Christophe Devine) --- */
void md5_starts( md5_context *ctx )
{ ctx->total[0] = 0;
ctx->total[1] = 0;
ctx->state[0] = 0x67452301;
ctx->state[1] = 0xEFCDAB89;
ctx->state[2] = 0x98BADCFE;
ctx->state[3] = 0x10325476; }
void md5_process( md5_context *ctx, uint8 data[64] )
{ uint32 X[16], A, B, C, D;
GET_UINT32( X[0], data, 0 );
GET_UINT32( X[1], data, 4 );
GET_UINT32( X[2], data, 8 );
GET_UINT32( X[3], data, 12 );
GET_UINT32( X[4], data, 16 );
GET_UINT32( X[5], data, 20 );
GET_UINT32( X[6], data, 24 );
GET_UINT32( X[7], data, 28 );
GET_UINT32( X[8], data, 32 );
GET_UINT32( X[9], data, 36 );
GET_UINT32( X[10], data, 40 );
GET_UINT32( X[11], data, 44 );
GET_UINT32( X[12], data, 48 );
GET_UINT32( X[13], data, 52 );
GET_UINT32( X[14], data, 56 );
GET_UINT32( X[15], data, 60 );
A = ctx->state[0];
B = ctx->state[1];
C = ctx->state[2];
D = ctx->state[3];
P1( X, &A, B, C, D, 0, 7, 0xD76AA478 );
P1( X, &D, A, B, C, 1, 12, 0xE8C7B756 );
P1( X, &C, D, A, B, 2, 17, 0x242070DB );
P1( X, &B, C, D, A, 3, 22, 0xC1BDCEEE );
P1( X, &A, B, C, D, 4, 7, 0xF57C0FAF );
P1( X, &D, A, B, C, 5, 12, 0x4787C62A );
P1( X, &C, D, A, B, 6, 17, 0xA8304613 );
P1( X, &B, C, D, A, 7, 22, 0xFD469501 );
P1( X, &A, B, C, D, 8, 7, 0x698098D8 );
P1( X, &D, A, B, C, 9, 12, 0x8B44F7AF );
P1( X, &C, D, A, B, 10, 17, 0xFFFF5BB1 );
P1( X, &B, C, D, A, 11, 22, 0x895CD7BE );
P1( X, &A, B, C, D, 12, 7, 0x6B901122 );
P1( X, &D, A, B, C, 13, 12, 0xFD987193 );
P1( X, &C, D, A, B, 14, 17, 0xA679438E );
P1( X, &B, C, D, A, 15, 22, 0x49B40821 );
P2( X, &A, B, C, D, 1, 5, 0xF61E2562 );
P2( X, &D, A, B, C, 6, 9, 0xC040B340 );
P2( X, &C, D, A, B, 11, 14, 0x265E5A51 );
P2( X, &B, C, D, A, 0, 20, 0xE9B6C7AA );
P2( X, &A, B, C, D, 5, 5, 0xD62F105D );
P2( X, &D, A, B, C, 10, 9, 0x02441453 );
P2( X, &C, D, A, B, 15, 14, 0xD8A1E681 );
P2( X, &B, C, D, A, 4, 20, 0xE7D3FBC8 );
P2( X, &A, B, C, D, 9, 5, 0x21E1CDE6 );
P2( X, &D, A, B, C, 14, 9, 0xC33707D6 );
P2( X, &C, D, A, B, 3, 14, 0xF4D50D87 );
P2( X, &B, C, D, A, 8, 20, 0x455A14ED );
P2( X, &A, B, C, D, 13, 5, 0xA9E3E905 );
P2( X, &D, A, B, C, 2, 9, 0xFCEFA3F8 );
P2( X, &C, D, A, B, 7, 14, 0x676F02D9 );
P2( X, &B, C, D, A, 12, 20, 0x8D2A4C8A );
P3( X, &A, B, C, D, 5, 4, 0xFFFA3942 );
P3( X, &D, A, B, C, 8, 11, 0x8771F681 );
P3( X, &C, D, A, B, 11, 16, 0x6D9D6122 );
P3( X, &B, C, D, A, 14, 23, 0xFDE5380C );
P3( X, &A, B, C, D, 1, 4, 0xA4BEEA44 );
P3( X, &D, A, B, C, 4, 11, 0x4BDECFA9 );
P3( X, &C, D, A, B, 7, 16, 0xF6BB4B60 );
P3( X, &B, C, D, A, 10, 23, 0xBEBFBC70 );
P3( X, &A, B, C, D, 13, 4, 0x289B7EC6 );
P3( X, &D, A, B, C, 0, 11, 0xEAA127FA );
P3( X, &C, D, A, B, 3, 16, 0xD4EF3085 );
P3( X, &B, C, D, A, 6, 23, 0x04881D05 );
P3( X, &A, B, C, D, 9, 4, 0xD9D4D039 );
P3( X, &D, A, B, C, 12, 11, 0xE6DB99E5 );
P3( X, &C, D, A, B, 15, 16, 0x1FA27CF8 );
P3( X, &B, C, D, A, 2, 23, 0xC4AC5665 );
P4( X, &A, B, C, D, 0, 6, 0xF4292244 );
P4( X, &D, A, B, C, 7, 10, 0x432AFF97 );
P4( X, &C, D, A, B, 14, 15, 0xAB9423A7 );
P4( X, &B, C, D, A, 5, 21, 0xFC93A039 );
P4( X, &A, B, C, D, 12, 6, 0x655B59C3 );
P4( X, &D, A, B, C, 3, 10, 0x8F0CCC92 );
P4( X, &C, D, A, B, 10, 15, 0xFFEFF47D );
P4( X, &B, C, D, A, 1, 21, 0x85845DD1 );
P4( X, &A, B, C, D, 8, 6, 0x6FA87E4F );
P4( X, &D, A, B, C, 15, 10, 0xFE2CE6E0 );
P4( X, &C, D, A, B, 6, 15, 0xA3014314 );
P4( X, &B, C, D, A, 13, 21, 0x4E0811A1 );
P4( X, &A, B, C, D, 4, 6, 0xF7537E82 );
P4( X, &D, A, B, C, 11, 10, 0xBD3AF235 );
P4( X, &C, D, A, B, 2, 15, 0x2AD7D2BB );
P4( X, &B, C, D, A, 9, 21, 0xEB86D391 );
ctx->state[0] += A;
ctx->state[1] += B;
ctx->state[2] += C;
ctx->state[3] += D; }
void md5_update( md5_context *ctx, uint8 *input, uint32 length )
{ uint32 left, fill;
if( length < 1 ) return;
left = ctx->total[0] & 0x3F;
fill = 64 - left;
ctx->total[0] += length;
ctx->total[0] &= 0xFFFFFFFF;
if( ctx->total[0] < length )
ctx->total[1]++;
if( left && length >= fill )
{ memcpy( (void *) (ctx->buffer + left),
(void *) input, fill );
md5_process( ctx, ctx->buffer );
length -= fill;
input += fill;
left = 0; }
while( length >= 64 )
{ md5_process( ctx, input );
length -= 64;
input += 64; }
if( length >= 1 )
memcpy( (void *) (ctx->buffer + left),
(void *) input, length ); }
void md5_finish( md5_context *ctx, uint8 digest[16] )
{ static uint8 md5_padding[64] =
{ 0x80, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0,
0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0,
0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0,
0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0 };
uint32 last, padn;
uint32 high, low;
uint8 msglen[8];
high = ( ctx->total[0] >> 29 )
| ( ctx->total[1] << 3 );
low = ( ctx->total[0] << 3 );
PUT_UINT32( low, msglen, 0 );
PUT_UINT32( high, msglen, 4 );
last = ctx->total[0] & 0x3F;
padn = ( last < 56 ) ? ( 56 - last ) : ( 120 - last );
md5_update( ctx, md5_padding, padn );
md5_update( ctx, msglen, 8 );
PUT_UINT32( ctx->state[0], digest, 0 );
PUT_UINT32( ctx->state[1], digest, 4 );
PUT_UINT32( ctx->state[2], digest, 8 );
PUT_UINT32( ctx->state[3], digest, 12 ); }
/* --- end-of-function md5str() and "friends" --- */
#if defined(GIF)
/* ==========================================================================
* Function: GetPixel ( int x, int y )
* Purpose: callback for GIF_CompressImage() returning the
* pixel at column x, row y
* --------------------------------------------------------------------------
* Arguments: x (I) int containing column=0...width-1
* of desired pixel
* y (I) int containing row=0...height-1
* of desired pixel
* --------------------------------------------------------------------------
* Returns: ( int ) 0 or 1, if pixel at x,y is off or on
* --------------------------------------------------------------------------
* Notes: o
* ======================================================================= */
/* --- entry point --- */
int GetPixel ( int x, int y )
{
int ipixel = y*bitmap_raster->width + x; /* pixel index for x,y-coords*/
int pixval =0; /* value of pixel */
if ( !isaa ) /* use bitmap if not anti-aliased */
pixval = (int)getlongbit(bitmap_raster->pixmap,ipixel); /*pixel = 0 or 1*/
else /* else use anti-aliased grayscale*/
pixval = (int)(colormap_raster[ipixel]); /* colors[] index number */
if ( msgfp!=NULL && msglevel>=9999 ) /* dump pixel */
{ fprintf(msgfp,"GetPixel> x=%d, y=%d pixel=%d\n",x,y,pixval);
fflush(msgfp); }
return pixval;
} /* --- end-of-function GetPixel() --- */
#endif /* gif */
#endif /* driver */
#endif /* PART1 */
/* ======================= END-OF-FILE MIMETEX.C ========================= */