376 lines
14 KiB
Text
376 lines
14 KiB
Text
<?php namespace ProcessWire;
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/**
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* ImageSizer Engine Animated GIF by Horst
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*
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* This module supports resizing and cropping of animated GIFs when using GD-Library
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* (The GD-Library does not support this)
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*
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* This module is based upon the work of
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*
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* * László Zsidi (initial classes)
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* http://www.gifs.hu/
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* http://www.phpclasses.org/gifsplit
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* http://www.phpclasses.org/gifmerge
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* (License: Apache 2.0)
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*
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* * xurei (enhanced classes)
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* https://github.com/xurei/GIFDecoder_optimized
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* (License: Apache 2.0)
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*
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* Ported first to ProcessWire module & then to ImageSizerEngine module by Horst Nogajski
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*
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* https://processwire.com/talk/topic/8386-image-animated-gif/
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*/
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class ImageSizerEngineAnimatedGif extends ImageSizerEngine {
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public static function getModuleInfo() {
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return array(
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'title' => 'Animated GIF Image Sizer',
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'version' => 1,
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'summary' => "Upgrades image manipulations for animated GIFs.",
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'author' => 'Horst Nogajski',
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);
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}
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/**
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* Class constructor
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*
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*/
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public function __construct() {
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parent::__construct();
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$this->set('enginePriority', 9); // use a late priority so that optional other installed engines get the job (first) if they support animated gifs
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}
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/**
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* Get valid image source formats
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*
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* @return array
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*
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*/
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protected function validSourceImageFormats() {
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return array('GIF');
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}
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/**
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* Get valid target image formats
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*
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* @return array
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*
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*/
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protected function validTargetImageFormats() {
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return $this->validSourceImageFormats();
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}
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/**
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* Get library version string
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*
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* @return string Returns version string or blank string if not applicable/available
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* @since 3.0.138
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*
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*/
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public function getLibraryVersion() {
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$gd = gd_info();
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return isset($gd['GD Version']) ? $gd['GD Version'] : '';
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}
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/**
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* Is GD supported?
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*
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* @param string $action
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* @return bool
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*
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*/
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public function supported($action = 'imageformat') {
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// first we check parts that are mandatory for all $actions
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if(!function_exists('gd_info')) return false;
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// and if it passes the mandatory requirements, we check particularly aspects here
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switch($action) {
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case 'imageformat':
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// compare current imagefile infos fetched from ImageInspector
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$requested = $this->getImageInfo(false);
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switch($requested) {
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case 'gif-anim':
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case 'gif-trans-anim':
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return true;
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default:
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return false;
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}
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break;
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case 'install':
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return true;
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default:
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return false;
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}
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}
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/**
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* Process the image resize
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*
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* Processing is as follows:
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* 1. first do a check if the given image(type) can be processed, if not do an early return false
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* 2. than (try) to process all required steps, if one failes, return false
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* 3. if all is successful, finally return true
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*
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* @param string $srcFilename Source file
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* @param string $dstFilename Destination file
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* @param int $fullWidth Current width
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* @param int $fullHeight Current height
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* @param int $finalWidth Requested final width
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* @param int $finalHeight Requested final height
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* @return bool True if successful, false if not
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* @throws WireException
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*
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*/
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protected function processResize($srcFilename, $dstFilename, $fullWidth, $fullHeight, $finalWidth, $finalHeight) {
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$this->modified = false;
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if(isset($this->info['bits'])) $this->imageDepth = $this->info['bits'];
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$this->imageFormat = strtoupper(str_replace('image/', '', $this->info['mime']));
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if(!in_array($this->imageFormat, $this->validSourceImageFormats())) {
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throw new WireException(sprintf($this->_("loaded file '%s' is not in the list of valid images"), basename($dstFilename)));
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}
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require_once(__DIR__ . '/gif_encoder.php');
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require_once(__DIR__ . '/gif_decoder.php');
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$this->setTimeLimit(120);
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$zoom = $this->getFocusZoomPercent();
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if($zoom > 1) {
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// we need to configure a cropExtra call to respect the zoom factor
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$this->cropExtra = $this->getFocusZoomCropDimensions($zoom, $fullWidth, $fullHeight, $finalWidth, $finalHeight);
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$this->cropping = false;
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}
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// if extra crop manipulation is requested, it is processed first
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if(is_array($this->cropExtra) && 4 == count($this->cropExtra)) { // crop before resize
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list($cropX, $cropY, $cropWidth, $cropHeight) = $this->cropExtra;
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$bg = null;
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$gif = new ISEAG_GIFDecoder(file_get_contents($srcFilename));
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$originalFramesMeta = $gif->GIFGetFramesMeta();
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if(count($originalFramesMeta) <= 0) return false;
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$this->meta = array(
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'delays' => $gif->GIFGetDelays(),
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'loops' => $gif->GIFGetLoop(),
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'disposal' => $gif->GIFGetDisposal(),
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'tr' => $gif->GIFGetTransparentR(),
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'tg' => $gif->GIFGetTransparentG(),
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'tb' => $gif->GIFGetTransparentB(),
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'trans' => (0 == $gif->GIFGetTransparentI() ? false : true)
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);
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$originalFrames = $gif->GIFGetFrames();
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$newFrames = array();
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foreach($originalFrames as $k => $v) {
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$frame = @imagecreatefromstring($v);
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if(!is_resource($frame)) continue;
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if(!is_resource($bg)) {
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$bg = imagecreatetruecolor($fullWidth, $fullHeight);
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$this->prepareGDimage($bg);
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}
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$srcX = 0;
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$srcY = 0;
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$srcW = imagesx($frame);
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$srcH = imagesy($frame);
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$dstX = $originalFramesMeta[$k]['left'];
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$dstY = $originalFramesMeta[$k]['top'];
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$dstW = $originalFramesMeta[$k]['width'];
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$dstH = $originalFramesMeta[$k]['height'];
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imagecopy($bg, $frame, $dstX, $dstY, $srcX, $srcY, $srcW, $srcH);
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$newimg = imagecreatetruecolor($cropWidth, $cropHeight);
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$this->prepareGDimage($newimg);
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imagecopy($newimg, $bg, 0, 0, $cropX, $cropY, $cropWidth, $cropHeight);
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array_push($newFrames, $newimg);
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$originalFrames[$k] = null;
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}
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if(count($newFrames) > 0) {
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$frames = array();
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foreach($newFrames as $nf) {
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if(!is_resource($nf)) continue;
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ob_start();
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imagegif($nf);
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$gifdata = ob_get_clean();
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array_push($frames, $gifdata);
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@imagedestroy($nf);
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}
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$gifmerge = new ISEAG_GIFEncoder(
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$frames,
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$this->meta['delays'],
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$this->meta['loops'],
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$this->meta['disposal'],
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$this->meta['tr'], $this->meta['tg'], $this->meta['tb'],
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'bin'
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);
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$result = false === fwrite(fopen($srcFilename, 'wb'), $gifmerge->GetAnimation()) ? false : true;
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if($result) {
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$fullWidth = $cropWidth;
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$fullHeight = $cropHeight;
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$this->image = array('width' => $fullWidth, 'height' => $fullHeight);
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}
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} else {
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// $result = false;
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}
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if(isset($bg) && is_resource($bg)) @imagedestroy($bg);
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if(isset($frame) && is_resource($frame)) @imagedestroy($frame);
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if(isset($newimg) && is_resource($newimg)) @imagedestroy($newimg);
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unset($gif, $gifmerge, $originalFrames, $originalFramesMeta, $newFrames, $cropHeight, $cropWidth, $cropX, $cropY, $dstH, $dstW, $dstX, $dstY, $frames, $nf, $srcH, $srcW, $srcX, $srcY);
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$this->meta = null;
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}
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// regular resize / crop manipulation starts here
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$bgX = $bgY = 0;
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$bgWidth = $fullWidth;
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$bgHeight = $fullHeight;
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$resizemethod = $this->getResizeMethod($bgWidth, $bgHeight, $finalWidth, $finalHeight, $bgX, $bgY);
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if(0 == $resizemethod) return true; // if same size or disallowed greater size is requested, we stop here and leave the original copy as is
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$gif = new ISEAG_GIFdecoder(file_get_contents($srcFilename));
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$originalFramesMeta = $gif->GIFGetFramesMeta();
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if(count($originalFramesMeta) <= 0) return false;
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$this->meta = array(
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'delays' => $gif->GIFGetDelays(),
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'loops' => $gif->GIFGetLoop(),
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'disposal' => $gif->GIFGetDisposal(),
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'tr' => $gif->GIFGetTransparentR(),
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'tg' => $gif->GIFGetTransparentG(),
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'tb' => $gif->GIFGetTransparentB(),
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'trans' => (0 == $gif->GIFGetTransparentI() ? false : true)
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);
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$originalFrames = $gif->GIFGetFrames();
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$newFrames = array();
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if(2 == $resizemethod) { // 2 = resize with aspect ratio
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$bg = null;
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// $ratio = 1.0;
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$ratio_w = $fullWidth / $finalWidth;
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$ratio_h = $fullHeight / $finalHeight;
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$ratio = ($ratio_h > $ratio_w ? $ratio_h : $ratio_w);
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foreach($originalFrames as $k => $v) {
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$frame = @imagecreatefromstring($v);
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if(!is_resource($frame)) continue;
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$newimg = imagecreatetruecolor($finalWidth, $finalHeight);
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$this->prepareGDimage($newimg);
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if(is_resource($bg)) {
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imagecopy($newimg, $bg, 0, 0, 0, 0, $finalWidth, $finalHeight);
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}
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$srcX = 0;
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$srcY = 0;
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$srcW = imagesx($frame);
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$srcH = imagesy($frame);
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$dstX = floor($originalFramesMeta[$k]['left'] / $ratio);
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$dstY = floor($originalFramesMeta[$k]['top'] / $ratio);
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$dstW = ceil($originalFramesMeta[$k]['width'] / $ratio);
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$dstH = ceil($originalFramesMeta[$k]['height'] / $ratio);
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imagecopyresampled($newimg, $frame, $dstX, $dstY, $srcX, $srcY, $dstW, $dstH, $srcW, $srcH);
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array_push($newFrames, $newimg);
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if(!is_resource($bg)) {
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$bg = imagecreatetruecolor($finalWidth, $finalHeight);
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$this->prepareGDimage($bg);
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}
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imagecopy($bg, $newimg, 0, 0, 0, 0, $finalWidth, $finalHeight);
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$originalFrames[$k] = null;
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}
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}
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if(4 == $resizemethod) { // 4 = resize and crop from center with aspect ratio
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$bg = null;
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// $ratio = 1.0;
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$ratio_w = $fullWidth / $bgWidth;
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$ratio_h = $fullHeight / $bgHeight;
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$ratio = ($ratio_h > $ratio_w ? $ratio_h : $ratio_w);
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foreach($originalFrames as $k => $v) {
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$frame = @imagecreatefromstring($v);
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if(!is_resource($frame)) continue;
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$newimg = imagecreatetruecolor($bgWidth, $bgHeight);
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$this->prepareGDimage($newimg);
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if(is_resource($bg)) {
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imagecopy($newimg, $bg, 0, 0, 0, 0, $bgWidth, $bgHeight);
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}
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$srcX = 0;
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$srcY = 0;
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$srcW = imagesx($frame);
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$srcH = imagesy($frame);
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$dstX = floor($originalFramesMeta[$k]['left'] / $ratio);
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$dstY = floor($originalFramesMeta[$k]['top'] / $ratio);
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$dstW = ceil($originalFramesMeta[$k]['width'] / $ratio);
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$dstH = ceil($originalFramesMeta[$k]['height'] / $ratio);
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imagecopyresampled($newimg, $frame, $dstX, $dstY, $srcX, $srcY, $dstW, $dstH, $srcW, $srcH);
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if(!is_resource($bg)) {
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$bg = imagecreatetruecolor($bgWidth, $bgHeight);
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$this->prepareGDimage($bg);
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}
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imagecopy($bg, $newimg, 0, 0, 0, 0, $bgWidth, $bgHeight);
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$newimg = imagecreatetruecolor($finalWidth, $finalHeight);
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$this->prepareGDimage($newimg);
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imagecopy($newimg, $bg, 0, 0, $bgX, $bgY, $finalWidth, $finalHeight);
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array_push($newFrames, $newimg);
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$originalFrames[$k] = null;
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}
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}
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if(count($newFrames) > 0) {
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$frames = array();
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foreach($newFrames as $nf) {
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if(!is_resource($nf)) continue;
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ob_start();
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imagegif($nf);
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$gifdata = ob_get_clean();
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array_push($frames, $gifdata);
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@imagedestroy($nf);
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}
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$gifmerge = new ISEAG_GIFEncoder(
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$frames,
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$this->meta['delays'],
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$this->meta['loops'],
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$this->meta['disposal'],
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$this->meta['tr'], $this->meta['tg'], $this->meta['tb'],
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'bin'
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);
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$result = false === fwrite(fopen($dstFilename, 'wb'), $gifmerge->GetAnimation()) ? false : true;
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} else {
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$result = false;
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}
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if(isset($bg) && is_resource($bg)) @imagedestroy($bg);
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if(isset($frame) && is_resource($frame)) @imagedestroy($frame);
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if(isset($newimg) && is_resource($newimg)) @imagedestroy($newimg);
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if(!$result) {
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return false;
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}
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$this->modified = true;
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return true;
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}
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/**
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* Helper for transparent background preparation
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*
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* @param resource $gdimage by reference $gdimage
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* @return void
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*
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*/
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protected function prepareGDimage(&$gdimage) {
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if(!$this->meta['trans']) return;
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$transparentNew = imagecolorallocate($gdimage, $this->meta['tr'], $this->meta['tg'], $this->meta['tb']);
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$transparentNewIndex = imagecolortransparent($gdimage, $transparentNew);
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imagefill($gdimage, 0, 0, $transparentNewIndex);
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}
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/**
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* Module install
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*
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* @throws WireException
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*
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*/
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public function ___install() {
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if(!$this->supported('install')) {
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throw new WireException("This module requires that you have PHP's GD image library bundled or installed");
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}
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}
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}
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