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kaklik |
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<?php |
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/** |
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* Thumbnail class. |
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* |
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* @author Tamlyn Rhodes <tam at zenology dot co dot uk> |
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* @license http://opensource.org/licenses/gpl-license.php GNU General Public License |
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* @copyright (c)2003-2005 Tamlyn Rhodes |
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* @version $Id: thumbnail.class.php,v 1.13 2006/06/24 20:33:00 tamlyn Exp $ |
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*/ |
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/** |
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* Creates and manages image thumbnails |
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* @package singapore |
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* @author Tamlyn Rhodes <tam at zenology dot co dot uk> |
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* @copyright (c)2003-2005 Tamlyn Rhodes |
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*/ |
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class sgThumbnail |
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{ |
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var $config; |
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var $maxWidth = 0; |
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var $maxHeight = 0; |
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var $thumbWidth = 0; |
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var $thumbHeight = 0; |
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var $cropWidth = 0; |
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var $cropHeight = 0; |
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var $forceSize = false; |
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var $imagePath = ""; |
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var $thumbPath = ""; |
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function sgThumbnail(&$img, $type) |
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{ |
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$this->config =& sgConfig::getInstance(); |
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$this->image =& $img; |
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$widthVar = "thumb_width_".$type; |
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$heightVar = "thumb_height_".$type; |
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$cropVar = "thumb_crop_".$type; |
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$this->maxWidth = $this->config->$widthVar; |
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$this->maxHeight = $this->config->$heightVar; |
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if(isset($this->config->$cropVar)) |
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$this->forceSize = $this->config->$cropVar; |
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if($this->image == null) return; |
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$this->imagePath = $this->image->realPath(); |
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$this->thumbPath = $this->config->base_path.Singapore::thumbnailPath($this->image->parent->id, $this->image->id, $this->maxWidth, $this->maxHeight, $this->forceSize); |
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$this->thumbURL = $this->config->base_url .Singapore::thumbnailPath($this->image->parent->id, $this->image->id, $this->maxWidth, $this->maxHeight, $this->forceSize); |
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//security check: make sure requested file is in galleries directory |
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if(!Singapore::isSubPath($this->config->base_path.$this->config->pathto_galleries, $this->imagePath) && !$this->image->isRemote()) |
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return; |
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//security check: make sure $image has a valid extension |
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if(!$this->image->isRemote() && !preg_match("/.+\.(".$this->config->recognised_extensions.")$/i",$this->image->id)) |
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return; |
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$this->calculateDimensions(); |
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//link straight to image if it smaller than required size |
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if($this->image->width <= $this->thumbWidth && $this->image->height <= $this->thumbHeight) { |
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$this->thumbURL = $this->image->realURL(); |
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return; |
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} |
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$imageModified = @filemtime($this->imagePath); |
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$thumbModified = @filemtime($this->thumbPath); |
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if($imageModified > $thumbModified || !$thumbModified) |
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$this->buildThumbnail(); |
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} |
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/** Accessor methods */ |
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function width() { return $this->thumbWidth; } |
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function height() { return $this->thumbHeight; } |
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function URL() { return $this->thumbURL; } |
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/** Private methods */ |
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/** |
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* Calculates thumbnail dimensions. |
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*/ |
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function calculateDimensions() |
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{ |
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//if aspect ratio is to be constrained set crop size |
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if($this->forceSize) { |
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$newAspect = $this->maxWidth/$this->maxHeight; |
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$oldAspect = $this->image->realWidth()/$this->image->realHeight(); |
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if($newAspect > $oldAspect) { |
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$this->cropWidth = $this->image->realWidth(); |
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$this->cropHeight = round($this->image->realHeight()*($oldAspect/$newAspect)); |
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} else { |
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$this->cropWidth = round($this->image->realWidth()*($newAspect/$oldAspect)); |
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$this->cropHeight = $this->image->realHeight(); |
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} |
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//else crop size is image size |
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} else { |
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$this->cropWidth = $this->image->realWidth(); |
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$this->cropHeight = $this->image->realHeight(); |
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} |
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if($this->cropHeight > $this->maxHeight && ($this->cropWidth <= $this->maxWidth |
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|| ($this->cropWidth > $this->maxWidth && round($this->cropHeight/$this->cropWidth * $this->maxWidth) > $this->maxHeight))) { |
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$this->thumbWidth = round($this->cropWidth/$this->cropHeight * $this->maxHeight); |
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$this->thumbHeight = $this->maxHeight; |
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} elseif($this->cropWidth > $this->maxWidth) { |
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$this->thumbWidth = $this->maxWidth; |
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$this->thumbHeight = round($this->cropHeight/$this->cropWidth * $this->maxWidth); |
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} else { |
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$this->thumbWidth = $this->image->realWidth(); |
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$this->thumbHeight = $this->image->realHeight(); |
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} |
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} |
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function buildThumbnail() { |
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//set cropping offset |
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$cropX = floor(($this->image->width-$this->cropWidth)/2); |
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$cropY = floor(($this->image->height-$this->cropHeight)/2); |
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//check thumbs directory exists and create it if not |
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if(!file_exists(dirname($this->thumbPath))) |
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Singapore::mkdir(dirname($this->thumbPath)); |
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//if file is remote then copy locally first |
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if($this->image->isRemote()) { |
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$ip = @fopen($this->imagePath, "rb"); |
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$tp = @fopen($this->thumbPath, "wb"); |
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if($ip && $tp) { |
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while(fwrite($tp,fread($ip, 4095))); |
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fclose($tp); |
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fclose($ip); |
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$this->imagePath = $this->thumbPath; |
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} |
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} |
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switch($this->config->thumbnail_software) { |
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case "im" : //use ImageMagick v5.x |
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$cmd = '"'.$this->config->pathto_convert.'"'; |
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if($this->forceSize) $cmd .= " -crop {$this->cropWidth}x{$this->cropHeight}+{$this->cropX}+{$this->cropY}"; |
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$cmd .= " -geometry {$this->thumbWidth}x{$this->thumbHeight}"; |
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if($this->image->type == 2) $cmd .= " -quality ".$this->config->thumbnail_quality; |
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if($this->config->progressive_thumbs) $cmd .= " -interlace Plane"; |
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if($this->config->remove_jpeg_profile) $cmd .= ' +profile "*"'; |
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$cmd .= ' '.escapeshellarg($this->imagePath).' '.escapeshellarg($this->thumbPath); |
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exec($cmd); |
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break; |
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case "im6" : //use ImageMagick v6.x |
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$cmd = '"'.$this->config->pathto_convert.'"'; |
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$cmd .= ' '.escapeshellarg($this->imagePath); |
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if($this->config->progressive_thumbs) $cmd .= " -interlace Plane"; |
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if($this->image->type == 2) $cmd .= " -quality ".$this->config->thumbnail_quality; |
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if($this->forceSize) $cmd .= " -crop {$this->cropWidth}x{$this->cropHeight}+{$this->cropX}+{$this->cropY}"; |
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$cmd .= " -resize {$this->thumbWidth}x{$this->thumbHeight}"; |
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if($this->config->remove_jpeg_profile) $cmd .= ' +profile "*"'; |
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$cmd .= ' '.escapeshellarg($this->thumbPath); |
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exec($cmd); |
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break; |
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case "gd2" : |
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case "gd1" : |
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default : //use GD by default |
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//read in image as appropriate type |
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switch($this->image->type) { |
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case 1 : $image = ImageCreateFromGIF($this->imagePath); break; |
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case 3 : $image = ImageCreateFromPNG($this->imagePath); break; |
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case 2 : |
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default: $image = ImageCreateFromJPEG($this->imagePath); break; |
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} |
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if($image) { |
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switch($this->config->thumbnail_software) { |
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case "gd2" : |
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//create blank truecolor image |
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$thumb = ImageCreateTrueColor($this->thumbWidth,$this->thumbHeight); |
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//resize image with resampling |
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ImageCopyResampled( |
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$thumb, $image, |
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0, 0, $cropX, $cropY, |
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$this->thumbWidth, $this->thumbHeight, $this->cropWidth, $this->cropHeight); |
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break; |
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case "gd1" : |
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default : |
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//create blank 256 color image |
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$thumb = ImageCreate($this->thumbWidth,$this->thumbHeight); |
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//resize image |
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ImageCopyResized( |
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$thumb, $image, |
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0, 0, $cropX, $cropY, |
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$this->thumbWidth, $this->thumbHeight, $this->cropWidth, $this->cropHeight); |
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break; |
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} |
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} /*else { |
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$thumb = ImageCreate($this->thumbWidth, $this->thumbHeight); |
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$bg = ImageColorAllocate($thumb, 255, 255, 255); |
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$text = ImageColorAllocate($thumb, 255, 0, 0); |
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ImageString($thumb, 1, 0, 0, "Cannot load source image", $text); |
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}*/ |
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//set image interlacing |
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@ImageInterlace($thumb, $this->config->progressive_thumbs); |
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//output image of appropriate type |
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switch($this->image->type) { |
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case 1 : |
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//GIF images are saved as PNG |
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case 3 : |
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ImagePNG($thumb, $this->thumbPath); |
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break; |
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case 2 : |
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default: |
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ImageJPEG($thumb, $this->thumbPath, $this->config->thumbnail_quality); |
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break; |
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} |
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@ImageDestroy($image); |
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@ImageDestroy($thumb); |
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} |
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//set file permissions on newly created thumbnail |
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@chmod($this->thumbPath, octdec($this->config->file_mode)); |
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} |
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} |
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?> |