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242 lines
7.0 KiB
242 lines
7.0 KiB
<?php
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/**
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* DOMPDF - PHP5 HTML to PDF renderer
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*
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* File: $RCSfile: font_metrics.cls.php,v $
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* Created on: 2004-06-02
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*
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* Copyright (c) 2004 - Benj Carson <benjcarson@digitaljunkies.ca>
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*
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* This library is free software; you can redistribute it and/or
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* modify it under the terms of the GNU Lesser General Public
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* License as published by the Free Software Foundation; either
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* version 2.1 of the License, or (at your option) any later version.
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*
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* This library is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
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* Lesser General Public License for more details.
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*
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* You should have received a copy of the GNU Lesser General Public License
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* along with this library in the file LICENSE.LGPL; if not, write to the
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* Free Software Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA
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* 02111-1307 USA
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*
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* Alternatively, you may distribute this software under the terms of the
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* PHP License, version 3.0 or later. A copy of this license should have
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* been distributed with this file in the file LICENSE.PHP . If this is not
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* the case, you can obtain a copy at http://www.php.net/license/3_0.txt.
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*
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* The latest version of DOMPDF might be available at:
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* http://www.dompdf.com/
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*
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* @link http://www.dompdf.com/
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* @copyright 2004 Benj Carson
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* @author Benj Carson <benjcarson@digitaljunkies.ca>
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* @contributor Helmut Tischer <htischer@weihenstephan.org>
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* @package dompdf
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*
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* Changes
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* @contributor Helmut Tischer <htischer@weihenstephan.org>
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* @version 0.5.1.htischer.20090507
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* - On missing font on explicite font selection don't change subtype and don't return default font.
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* - On requesting default font and missing subtype, check similar subtypes, then any subtype, then normal. The last must exist.
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* - Add comments
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*/
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/* $Id: font_metrics.cls.php 216 2010-03-11 22:49:18Z ryan.masten $ */
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require_once(DOMPDF_LIB_DIR . "/class.pdf.php");
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/**
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* Name of the font cache file
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*
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* This file must be writable by the webserver process only to update it
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* with save_font_families() after adding the .afm file references of a new font family
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* with Font_Metrics::save_font_families().
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* This is typically done only from command line with load_font.php on converting
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* ttf fonts to afm with an external tool referenced in the define _TTF2AFM
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*
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* Declared here because PHP5 prevents constants from being declared with expressions
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*/
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if (file_exists(DOMPDF_FONT_DIR . "dompdf_font_family_cache")) {
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define('__DOMPDF_FONT_CACHE_FILE', DOMPDF_FONT_DIR . "dompdf_font_family_cache");
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} else {
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define('__DOMPDF_FONT_CACHE_FILE', DOMPDF_FONT_DIR . "dompdf_font_family_cache.dist");
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}
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/**
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* The font metrics class
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*
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* This class provides information about fonts and text. It can resolve
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* font names into actual installed font files, as well as determine the
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* size of text in a particular font and size.
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*
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* @static
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* @package dompdf
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*/
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class Font_Metrics {
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/**
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* @see __DOMPDF_FONT_CACHE_FILE
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*/
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const CACHE_FILE = __DOMPDF_FONT_CACHE_FILE;
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/**
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* Underlying {@link Cpdf} object to perform text size calculations
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*
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* @var Cpdf
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*/
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static protected $_pdf = null;
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/**
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* Array of font family names to font files
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*
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* Usually cached by the {@link load_font.php} script
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*
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* @var array
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*/
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static protected $_font_lookup = array();
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/**
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* Class initialization
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*
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*/
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static function init() {
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if (!self::$_pdf) {
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self::load_font_families();
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self::$_pdf = Canvas_Factory::get_instance();
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}
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}
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/**
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* Calculates text size, in points
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*
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* @param string $text the text to be sized
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* @param string $font the desired font
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* @param float $size the desired font size
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* @param float $spacing word spacing, if any
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* @return float
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*/
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static function get_text_width($text, $font, $size, $spacing = 0) {
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return self::$_pdf->get_text_width($text, $font, $size, $spacing);
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}
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/**
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* Calculates font height
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*
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* @param string $font
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* @param float $size
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* @return float
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*/
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static function get_font_height($font, $size) {
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return self::$_pdf->get_font_height($font, $size);
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}
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/**
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* Resolves a font family & subtype into an actual font file
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*
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* Subtype can be one of 'normal', 'bold', 'italic' or 'bold_italic'. If
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* the particular font family has no suitable font file, the default font
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* ({@link DOMPDF_DEFAULT_FONT}) is used. The font file returned
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* is the absolute pathname to the font file on the system.
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*
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* @param string $family
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* @param string $subtype
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* @return string
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*/
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static function get_font($family, $subtype = "normal") {
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/* Allow calling for various fonts in search path. Therefore not immediately
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* return replacement on non match.
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* Only when called with NULL try replacement.
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* When this is also missing there is really trouble.
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* If only the subtype fails, nevertheless return failure.
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* Only on checking the fallback font, check various subtypes on same font.
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*/
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if ( $family ) {
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$family = str_replace( array("'", '"'), "", mb_strtolower($family));
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$subtype = mb_strtolower($subtype);
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if ( isset(self::$_font_lookup[$family][$subtype]) ) {
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return self::$_font_lookup[$family][$subtype];
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}
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return null;
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}
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$family = DOMPDF_DEFAULT_FONT;
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if ( isset(self::$_font_lookup[$family][$subtype]) ) {
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return self::$_font_lookup[$family][$subtype];
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}
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foreach ( self::$_font_lookup[$family] as $sub => $font ) {
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if (strpos($subtype, $sub) !== false) {
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return $font;
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}
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}
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if ($subtype !== "normal") {
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foreach ( self::$_font_lookup[$family] as $sub => $font ) {
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if ($sub !== "normal") {
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return $font;
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}
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}
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}
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$subtype = "normal";
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if ( isset(self::$_font_lookup[$family][$subtype]) ) {
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return self::$_font_lookup[$family][$subtype];
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}
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return null;
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}
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/**
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* Saves the stored font family cache
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*
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* The name and location of the cache file are determined by {@link
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* Font_Metrics::CACHE_FILE}. This file should be writable by the
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* webserver process.
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*
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* @see Font_Metrics::load_font_families()
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*/
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static function save_font_families() {
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file_put_contents(self::CACHE_FILE, var_export(self::$_font_lookup, true));
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}
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/**
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* Loads the stored font family cache
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*
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* @see save_font_families()
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*/
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static function load_font_families() {
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if ( !is_readable(self::CACHE_FILE) )
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return;
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$data = file_get_contents(self::CACHE_FILE);
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if ( $data != "" )
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eval ('self::$_font_lookup = ' . $data . ";");
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}
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/**
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* Returns the current font lookup table
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*
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* @return array
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*/
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static function get_font_families() {
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return self::$_font_lookup;
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}
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static function set_font_family($fontname, $entry) {
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self::$_font_lookup[mb_strtolower($fontname)] = $entry;
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}
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}
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Font_Metrics::init();
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