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save current work state of Preview Lib

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remotes/origin/stable6
Georg Ehrke 12 years ago
parent ec3e97f28f
commit 9ef449842a
1 changed files with 229 additions and 149 deletions
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  1. 378
      lib/preview.php

378
lib/preview.php
Unescape View File

@ -1,28 +1,139 @@
<?php
/**
* Copyright (c) 2012 Frank Karlitschek frank@owncloud.org
* Copyright (c) 2013 Frank Karlitschek frank@owncloud.org
* Copyright (c) 2013 Georg Ehrke georg@ownCloud.com
* This file is licensed under the Affero General Public License version 3 or
* later.
* See the COPYING-README file.
*/
/*
TODO:
- delete thumbnails if files change.
- make it work with external filesystem files.
- movies support
- pdf support
- mp3/id3 support
- more file types
* Thumbnails:
* structure of filename:
* /data/user/thumbnails/pathhash/x-y.png
*
*/
*/
class OC_Preview {
//the thumbnail folder
const THUMBNAILS_FOLDER = 'thumbnails';
const MAX_SCALE_FACTOR = 2;
//fileview object
static private $fileview = null;
//preview providers
static private $providers = array();
static private $registeredProviders = array();
class OC_Preview {
/**
* @brief check if thumbnail or bigger version of thumbnail of file is cached
* @param $file The path to the file where you want a thumbnail from
* @param $maxX The maximum X size of the thumbnail. It can be smaller depending on the shape of the image
* @param $maxY The maximum Y size of the thumbnail. It can be smaller depending on the shape of the image
* @return mixed (bool / string)
* false if thumbnail does not exist
* path to thumbnail if thumbnail exists
*/
private static function isCached($file, $maxX, $maxY, $scalingup){
$fileinfo = self::$fileview->getFileInfo($file);
$fileid = self::$fileinfo['fileid'];
//echo self::THUMBNAILS_FOLDER . PATH_SEPARATOR . $fileid;
if(!self::$fileview->is_dir(self::THUMBNAILS_FOLDER . PATH_SEPARATOR . $fileid)){
return false;
}
//does a preview with the wanted height and width already exist?
if(self::$fileview->file_exists(self::THUMBNAILS_FOLDER . PATH_SEPARATOR . $fileid . PATH_SEPARATOR . $x . '-' . $y . '.png')){
return self::THUMBNAILS_FOLDER . PATH_SEPARATOR . $fileid . PATH_SEPARATOR . $x . '-' . $y . '.png';
}
$wantedaspectratio = $maxX / $maxY;
//array for usable cached thumbnails
$possiblethumbnails = array();
$allthumbnails = self::$fileview->getDirectoryContent(self::THUMBNAILS_FOLDER . PATH_SEPARATOR . $fileid);
foreach($allthumbnails as $thumbnail){
$size = explode('-', $thumbnail['name']);
$x = $size[0];
$y = $size[1];
$aspectratio = $x / $y;
if($aspectratio != $wantedaspectratio){
continue;
}
if($x < $maxX || $y < $maxY){
if($scalingup){
$scalefactor = $maxX / $x;
if($scalefactor > self::MAX_SCALE_FACTOR){
continue;
}
}else{
continue;
}
}
$possiblethumbnails[$x] = $thumbnail['path'];
}
if(count($possiblethumbnails) === 0){
return false;
}
if(count($possiblethumbnails) === 1){
return current($possiblethumbnails);
}
ksort($possiblethumbnails);
if(key(reset($possiblethumbnails)) > $maxX){
return current(reset($possiblethumbnails));
}
if(key(end($possiblethumbnails)) < $maxX){
return current(end($possiblethumbnails));
}
foreach($possiblethumbnails as $width => $path){
if($width < $maxX){
continue;
}else{
return $path;
}
}
}
// the thumbnail cache folder
const THUMBNAILS_FOLDER = 'thumbnails';
/**
* @brief delete a preview with a specfic height and width
* @param $file path to the file
* @param $x width of preview
* @param $y height of preview
* @return image
*/
public static function deletePreview($file, $x, $y){
self::init();
$fileinfo = self::$fileview->getFileInfo($file);
$fileid = self::$fileinfo['fileid'];
return self::$fileview->unlink(self::THUMBNAILS_FOLDER . PATH_SEPARATOR . $fileid . PATH_SEPARATOR . $x . '-' . $y . '.png');
}
/**
* @brief deletes all previews of a file
* @param $file path of file
* @return bool
*/
public static function deleteAllPrevies($file){
self::init();
$fileinfo = self::$fileview->getFileInfo($file);
$fileid = self::$fileinfo['fileid'];
return self::$fielview->rmdir(self::THUMBNAILS_FOLDER . PATH_SEPARATOR . $fileid);
}
/**
* @brief return a preview of a file
@ -32,146 +143,115 @@ class OC_Preview {
* @param $scaleup Scale smaller images up to the thumbnail size or not. Might look ugly
* @return image
*/
static public function show($file,$maxX,$maxY,$scalingup) {
// get the mimetype of the file
$mimetype=explode('/',OC_FileSystem::getMimeType($file));
// it´s an image
if($mimetype[0]=='image'){
OCP\Response::enableCaching(3600 * 24); // 24 hour
$image=OC_PreviewImage::getThumbnail($file,$maxX,$maxY,$scalingup);
$image->show();
// it´s a video
}elseif($mimetype[0]=='video'){
OCP\Response::enableCaching(3600 * 24); // 24 hour
OC_PreviewMovie::getThumbnail($file,$maxX,$maxY,$scalingup);
// it´s something else. Let´s create a dummy preview
}else{
header('Content-type: image/png');
OC_PreviewUnknown::getThumbnail($maxX,$maxY);
public static function getPreview($file, $maxX, $maxY, $scalingup){
self::init();
$cached = self::isCached($file, $maxX, $maxY);
if($cached){
$image = new \OC_Image($cached);
if($image->width() != $maxX && $image->height != $maxY){
$image->preciseResize($maxX, $maxY);
}
return $image;
}
$mimetype = self::$fileview->getMimeType($file);
$preview;
foreach(self::$providers as $supportedmimetype => $provider){
if(!preg_match($supportedmimetype, $mimetype)){
continue;
}
$preview = $provider->getThumbnail($file, $maxX, $maxY, $scalingup);
if(!$preview){
continue;
}
if(!($preview instanceof \OC_Image)){
$preview = @new \OC_Image($preview);
}
//cache thumbnail
$preview->save(self::$filesview->getAbsolutePath(self::THUMBNAILS_FOLDER . PATH_SEPARATOR . $fileid . PATH_SEPARATOR . $x . '-' . $y . '.png'));
break;
}
return $preview;
}
/**
* @brief return a preview of a file
* @param $file The path to the file where you want a thumbnail from
* @param $maxX The maximum X size of the thumbnail. It can be smaller depending on the shape of the image
* @param $maxY The maximum Y size of the thumbnail. It can be smaller depending on the shape of the image
* @param $scaleup Scale smaller images up to the thumbnail size or not. Might look ugly
* @return image
*/
public static function showPreview($file, $maxX, $maxY, $scalingup = true, $fontsize = 12){
OCP\Response::enableCaching(3600 * 24); // 24 hour
$preview = self::getPreview($file, $maxX, $maxY, $scalingup, $fontsize);
$preview->show();
}
/**
* @brief check whether or not providers and views are initialized and initialize if not
* @return void
*/
private static function init(){
if(empty(self::$providers)){
self::initProviders();
}
if(is_null(self::$thumbnailsview) || is_null(self::$userlandview)){
self::initViews();
}
}
}
class OC_PreviewImage {
public static function getThumbnail($path,$maxX,$maxY,$scalingup) {
$thumbnails_view = new \OC_FilesystemView('/'.\OCP\User::getUser() .'/'.OC_Preview::THUMBNAILS_FOLDER);
// is a preview already in the cache?
if ($thumbnails_view->file_exists($path.'-'.$maxX.'-'.$maxY.'-'.$scalingup)) {
return new \OC_Image($thumbnails_view->getLocalFile($path.'-'.$maxX.'-'.$maxY.'-'.$scalingup));
}
// does the sourcefile exist?
if (!\OC_Filesystem::file_exists($path)) {
\OC_Log::write('Preview', 'File '.$path.' don\'t exists', \OC_Log::WARN);
return false;
}
// open the source image
$image = new \OC_Image();
$image->loadFromFile(\OC_Filesystem::getLocalFile($path));
if (!$image->valid()) return false;
// fix the orientation
$image->fixOrientation();
// calculate the right preview size
$Xsize=$image->width();
$Ysize=$image->height();
if (($Xsize/$Ysize)>($maxX/$maxY)) {
$factor=$maxX/$Xsize;
} else {
$factor=$maxY/$Ysize;
}
// only scale up if requested
if($scalingup==false) {
if($factor>1) $factor=1;
}
$newXsize=$Xsize*$factor;
$newYsize=$Ysize*$factor;
// resize
$ret = $image->preciseResize($newXsize, $newYsize);
if (!$ret) {
\OC_Log::write('Preview', 'Couldn\'t resize image', \OC_Log::ERROR);
unset($image);
return false;
}
// store in cache
$l = $thumbnails_view->getLocalFile($path.'-'.$maxX.'-'.$maxY.'-'.$scalingup);
$image->save($l);
return $image;
}
}
class OC_PreviewMovie {
public static function isAvailable() {
$check=shell_exec('ffmpeg');
if($check==NULL) return(false); else return(true);
}
public static function getThumbnail($path,$maxX,$maxY,$scalingup) {
$thumbnails_view = new \OC_FilesystemView('/'.\OCP\User::getUser() .'/'.OC_Preview::THUMBNAILS_FOLDER);
// is a preview already in the cache?
if ($thumbnails_view->file_exists($path.'-'.$maxX.'-'.$maxY.'-'.$scalingup)) {
return new \OC_Image($thumbnails_view->getLocalFile($path.'-'.$maxX.'-'.$maxY.'-'.$scalingup));
}
// does the sourcefile exist?
if (!\OC_Filesystem::file_exists($path)) {
\OC_Log::write('Preview', 'File '.$path.' don\'t exists', \OC_Log::WARN);
return false;
}
// call ffmpeg to do the screenshot
shell_exec('ffmpeg -y -i {'.escapeshellarg($path).'} -f mjpeg -vframes 1 -ss 1 -s {'.escapeshellarg($maxX).'}x{'.escapeshellarg($maxY).'} {.'.$thumbnails_view->getLocalFile($path.'-'.$maxX.'-'.$maxY.'-'.$scalingup).'}');
// output the generated Preview
$thumbnails_view->getLocalFile($path.'-'.$maxX.'-'.$maxY.'-'.$scalingup);
unset($thumbnails_view);
}
}
/**
* @brief register a new preview provider to be used
* @param string $provider class name of a OC_Preview_Provider
* @return void
*/
public static function registerProvider($class, $options=array()){
self::$registeredProviders[]=array('class'=>$class, 'options'=>$options);
}
class OC_PreviewUnknown {
public static function getThumbnail($maxX,$maxY) {
/**
* @brief create instances of all the registered preview providers
* @return void
*/
private static function initProviders(){
if(count(self::$providers)>0) {
return;
}
foreach(self::$registeredProviders as $provider) {
$class=$provider['class'];
$options=$provider['options'];
// check if GD is installed
if(!extension_loaded('gd') || !function_exists('gd_info')) {
OC_Log::write('preview', __METHOD__.'(): GD module not installed', OC_Log::ERROR);
return false;
$object = new $class($options);
self::$providers[$object->getMimeType()] = $object;
}
// create a white image
$image = imagecreatetruecolor($maxX, $maxY);
$color = imagecolorallocate($image, 255, 255, 255);
imagefill($image, 0, 0, $color);
// output the image
imagepng($image);
imagedestroy($image);
}
}
$keys = array_map('strlen', array_keys(self::$providers));
array_multisort($keys, SORT_DESC, self::$providers);
}
/**
* @brief initialize a new \OC\Files\View object
* @return void
*/
private static function initViews(){
if(is_null(self::$fileview)){
self::$fileview = new OC\Files\View();
}
}
public static function previewRouter($params){
var_dump($params);
}
}
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