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135 lines
3.7 KiB
PHP
Executable file
135 lines
3.7 KiB
PHP
Executable file
<?php
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/**
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* Copyright (c) 2012 Frank Karlitschek frank@owncloud.org
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* This file is licensed under the Affero General Public License version 3 or
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* later.
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* See the COPYING-README file.
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*/
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/*
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TODO:
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- delete thumbnails if files change.
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- movies support
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- pdf support
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- mp3/id3 support
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- more file types
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*/
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class OC_Preview {
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// the thumbnail cache folder
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const THUMBNAILS_FOLDER = 'thumbnails';
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/**
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* @brief return a preview of a file
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* @param $file The path to the file where you want a thumbnail from
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* @param $maxX The maximum X size of the thumbnail. It can be smaller depending on the shape of the image
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* @param $maxY The maximum Y size of the thumbnail. It can be smaller depending on the shape of the image
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* @param $scaleup Scale smaller images up to the thumbnail size or not. Might look ugly
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* @return image
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*/
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static public function show($file,$maxX,$maxY,$scalingup) {
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// get the mimetype of the file
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$mimetype=explode('/',OC_FileSystem::getMimeType($file));
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// it´s an image
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if($mimetype[0]=='image'){
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OCP\Response::enableCaching(3600 * 24); // 24 hour
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$image=OC_PreviewImage::getThumbnail($file,$maxX,$maxY,$scalingup);
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$image->show();
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// it´s something else. Let´s create a dummy preview
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}else{
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header('Content-type: image/png');
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OC_PreviewUnknown::getThumbnail($maxX,$maxY);
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}
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}
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}
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class OC_PreviewImage {
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public static function getThumbnail($path,$maxX,$maxY,$scalingup) {
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$thumbnails_view = new \OC_FilesystemView('/'.\OCP\User::getUser() .'/'.OC_Preview::THUMBNAILS_FOLDER);
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// is a preview already in the cache?
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if ($thumbnails_view->file_exists($path.'-'.$maxX.'-'.$maxY.'-'.$scalingup)) {
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return new \OC_Image($thumbnails_view->getLocalFile($path.'-'.$maxX.'-'.$maxY.'-'.$scalingup));
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}
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// does the sourcefile exist?
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if (!\OC_Filesystem::file_exists($path)) {
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\OC_Log::write('Preview', 'File '.$path.' don\'t exists', \OC_Log::WARN);
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return false;
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}
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// open the source image
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$image = new \OC_Image();
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$image->loadFromFile(\OC_Filesystem::getLocalFile($path));
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if (!$image->valid()) return false;
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// fix the orientation
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$image->fixOrientation();
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// calculate the right preview size
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$Xsize=$image->width();
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$Ysize=$image->height();
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if (($Xsize/$Ysize)>($maxX/$maxY)) {
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$factor=$maxX/$Xsize;
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} else {
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$factor=$maxY/$Ysize;
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}
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// only scale up if requested
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if($scalingup==false) {
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if($factor>1) $factor=1;
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}
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$newXsize=$Xsize*$factor;
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$newYsize=$Ysize*$factor;
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// resize
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$ret = $image->preciseResize($newXsize, $newYsize);
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if (!$ret) {
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\OC_Log::write('Preview', 'Couldn\'t resize image', \OC_Log::ERROR);
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unset($image);
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return false;
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}
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// store in cache
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$l = $thumbnails_view->getLocalFile($path.'-'.$maxX.'-'.$maxY.'-'.$scalingup);
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$image->save($l);
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return $image;
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}
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}
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class OC_PreviewUnknown {
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public static function getThumbnail($maxX,$maxY) {
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// check if GD is installed
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if(!extension_loaded('gd') || !function_exists('gd_info')) {
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OC_Log::write('preview', __METHOD__.'(): GD module not installed', OC_Log::ERROR);
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return false;
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}
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// create a white image
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$image = imagecreatetruecolor($maxX, $maxY);
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$color = imagecolorallocate($image, 255, 255, 255);
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imagefill($image, 0, 0, $color);
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// output the image
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imagepng($image);
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imagedestroy($image);
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}
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}
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