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<?php /** * Handler for GIF images. * * This program is free software; you can redistribute it and/or modify * it under the terms of the GNU General Public License as published by * the Free Software Foundation; either version 2 of the License, or * (at your option) any later version. * * This program is distributed in the hope that it will be useful, * but WITHOUT ANY WARRANTY; without even the implied warranty of * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the * GNU General Public License for more details. * * You should have received a copy of the GNU General Public License along * with this program; if not, write to the Free Software Foundation, Inc., * 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301, USA. * http://www.gnu.org/copyleft/gpl.html * * @file * @ingroup Media */ use MediaWiki\Context\IContextSource; use MediaWiki\MainConfigNames; use MediaWiki\MediaWikiServices; use Wikimedia\RequestTimeout\TimeoutException; /** * Handler for GIF images. * * @ingroup Media */ class GIFHandler extends BitmapHandler { /** * Value to store in img_metadata if there was error extracting metadata */ private const BROKEN_FILE = '0'; public function getSizeAndMetadata( $state, $filename ) { try { $parsedGIFMetadata = BitmapMetadataHandler::GIF( $filename ); } catch ( TimeoutException $e ) { throw $e; } catch ( Exception $e ) { // Broken file? wfDebug( __METHOD__ . ': ' . $e->getMessage() ); return [ 'metadata' => [ '_error' => self::BROKEN_FILE ] ]; } return [ 'width' => $parsedGIFMetadata['width'], 'height' => $parsedGIFMetadata['height'], 'bits' => $parsedGIFMetadata['bits'], 'metadata' => array_diff_key( $parsedGIFMetadata, [ 'width' => true, 'height' => true, 'bits' => true ] ) ]; } /** * @param File $image * @param IContextSource|false $context * @return array[]|false */ public function formatMetadata( $image, $context = false ) { $meta = $this->getCommonMetaArray( $image ); if ( !$meta ) { return false; } return $this->formatMetadataHelper( $meta, $context ); } /** * Return the standard metadata elements for #filemetadata parser func. * @param File $image * @return array */ public function getCommonMetaArray( File $image ) { $meta = $image->getMetadataArray(); if ( !isset( $meta['metadata'] ) ) { return []; } unset( $meta['metadata']['_MW_GIF_VERSION'] ); return $meta['metadata']; } /** * @todo Add unit tests * * @param File $image * @return int */ public function getImageArea( $image ) { $metadata = $image->getMetadataArray(); if ( isset( $metadata['frameCount'] ) && $metadata['frameCount'] > 0 ) { return $image->getWidth() * $image->getHeight() * $metadata['frameCount']; } return $image->getWidth() * $image->getHeight(); } /** * @param File $image * @return bool */ public function isAnimatedImage( $image ) { $metadata = $image->getMetadataArray(); if ( isset( $metadata['frameCount'] ) && $metadata['frameCount'] > 1 ) { return true; } return false; } /** * We cannot animate thumbnails that are bigger than a particular size * @param File $file * @return bool */ public function canAnimateThumbnail( $file ) { $maxAnimatedGifArea = MediaWikiServices::getInstance()->getMainConfig() ->get( MainConfigNames::MaxAnimatedGifArea ); return $this->getImageArea( $file ) <= $maxAnimatedGifArea; } public function getMetadataType( $image ) { return 'parsed-gif'; } public function isFileMetadataValid( $image ) { $data = $image->getMetadataArray(); if ( $data === [ '_error' => self::BROKEN_FILE ] ) { // Do not repetitively regenerate metadata on broken file. return self::METADATA_GOOD; } if ( !$data || isset( $data['_error'] ) ) { wfDebug( __METHOD__ . " invalid GIF metadata" ); return self::METADATA_BAD; } if ( !isset( $data['metadata']['_MW_GIF_VERSION'] ) || $data['metadata']['_MW_GIF_VERSION'] !== GIFMetadataExtractor::VERSION ) { wfDebug( __METHOD__ . " old but compatible GIF metadata" ); return self::METADATA_COMPATIBLE; } return self::METADATA_GOOD; } /** * @param File $image * @return string */ public function getLongDesc( $image ) { global $wgLang; $original = parent::getLongDesc( $image ); $metadata = $image->getMetadataArray(); if ( !$metadata || isset( $metadata['_error'] ) || $metadata['frameCount'] <= 0 ) { return $original; } /* Preserve original image info string, but strip the last char ')' so we can add even more */ $info = []; $info[] = $original; if ( $metadata['looped'] ) { $info[] = wfMessage( 'file-info-gif-looped' )->parse(); } if ( $metadata['frameCount'] > 1 ) { $info[] = wfMessage( 'file-info-gif-frames' )->numParams( $metadata['frameCount'] )->parse(); } if ( $metadata['duration'] ) { $info[] = $wgLang->formatTimePeriod( $metadata['duration'] ); } return $wgLang->commaList( $info ); } /** * Return the duration of the GIF file. * * Shown in the &query=imageinfo&iiprop=size api query. * * @param File $file * @return float The duration of the file. */ public function getLength( $file ) { $metadata = $file->getMetadataArray(); if ( !$metadata || !isset( $metadata['duration'] ) || !$metadata['duration'] ) { return 0.0; } return (float)$metadata['duration']; } }
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