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| 1 | <?php |
| 2 | /** |
| 3 | * Handler for PNG images. |
| 4 | * |
| 5 | * This program is free software; you can redistribute it and/or modify |
| 6 | * it under the terms of the GNU General Public License as published by |
| 7 | * the Free Software Foundation; either version 2 of the License, or |
| 8 | * (at your option) any later version. |
| 9 | * |
| 10 | * This program is distributed in the hope that it will be useful, |
| 11 | * but WITHOUT ANY WARRANTY; without even the implied warranty of |
| 12 | * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the |
| 13 | * GNU General Public License for more details. |
| 14 | * |
| 15 | * You should have received a copy of the GNU General Public License along |
| 16 | * with this program; if not, write to the Free Software Foundation, Inc., |
| 17 | * 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301, USA. |
| 18 | * http://www.gnu.org/copyleft/gpl.html |
| 19 | * |
| 20 | * @file |
| 21 | * @ingroup Media |
| 22 | */ |
| 23 | |
| 24 | use Wikimedia\RequestTimeout\TimeoutException; |
| 25 | |
| 26 | /** |
| 27 | * Handler for PNG images. |
| 28 | * |
| 29 | * @ingroup Media |
| 30 | */ |
| 31 | class PNGHandler extends BitmapHandler { |
| 32 | private const BROKEN_FILE = '0'; |
| 33 | |
| 34 | /** |
| 35 | * @param MediaHandlerState $state |
| 36 | * @param string $filename |
| 37 | * @return array |
| 38 | */ |
| 39 | public function getSizeAndMetadata( $state, $filename ) { |
| 40 | try { |
| 41 | $metadata = BitmapMetadataHandler::PNG( $filename ); |
| 42 | } catch ( TimeoutException $e ) { |
| 43 | throw $e; |
| 44 | } catch ( Exception $e ) { |
| 45 | // Broken file? |
| 46 | wfDebug( __METHOD__ . ': ' . $e->getMessage() ); |
| 47 | |
| 48 | return [ 'metadata' => [ '_error' => self::BROKEN_FILE ] ]; |
| 49 | } |
| 50 | |
| 51 | return [ |
| 52 | 'width' => $metadata['width'], |
| 53 | 'height' => $metadata['height'], |
| 54 | 'bits' => $metadata['bitDepth'], |
| 55 | 'metadata' => array_diff_key( |
| 56 | $metadata, |
| 57 | [ 'width' => true, 'height' => true, 'bits' => true ] |
| 58 | ) |
| 59 | ]; |
| 60 | } |
| 61 | |
| 62 | /** |
| 63 | * @param File $image |
| 64 | * @param IContextSource|false $context |
| 65 | * @return array[]|false |
| 66 | */ |
| 67 | public function formatMetadata( $image, $context = false ) { |
| 68 | $meta = $this->getCommonMetaArray( $image ); |
| 69 | if ( !$meta ) { |
| 70 | return false; |
| 71 | } |
| 72 | |
| 73 | return $this->formatMetadataHelper( $meta, $context ); |
| 74 | } |
| 75 | |
| 76 | /** |
| 77 | * Get a file type independent array of metadata. |
| 78 | * |
| 79 | * @param File $image |
| 80 | * @return array The metadata array |
| 81 | */ |
| 82 | public function getCommonMetaArray( File $image ) { |
| 83 | $meta = $image->getMetadataArray(); |
| 84 | |
| 85 | if ( !isset( $meta['metadata'] ) ) { |
| 86 | return []; |
| 87 | } |
| 88 | unset( $meta['metadata']['_MW_PNG_VERSION'] ); |
| 89 | |
| 90 | return $meta['metadata']; |
| 91 | } |
| 92 | |
| 93 | /** |
| 94 | * @param File $image |
| 95 | * @return bool |
| 96 | */ |
| 97 | public function isAnimatedImage( $image ) { |
| 98 | $metadata = $image->getMetadataArray(); |
| 99 | return isset( $metadata['frameCount'] ) && $metadata['frameCount'] > 1; |
| 100 | } |
| 101 | |
| 102 | /** |
| 103 | * We do not support making APNG thumbnails, so always false |
| 104 | * @param File $image |
| 105 | * @return bool False |
| 106 | */ |
| 107 | public function canAnimateThumbnail( $image ) { |
| 108 | return false; |
| 109 | } |
| 110 | |
| 111 | public function getMetadataType( $image ) { |
| 112 | return 'parsed-png'; |
| 113 | } |
| 114 | |
| 115 | public function isFileMetadataValid( $image ) { |
| 116 | $data = $image->getMetadataArray(); |
| 117 | if ( $data === [ '_error' => self::BROKEN_FILE ] ) { |
| 118 | // Do not repetitively regenerate metadata on broken file. |
| 119 | return self::METADATA_GOOD; |
| 120 | } |
| 121 | |
| 122 | if ( !$data || isset( $data['_error'] ) ) { |
| 123 | wfDebug( __METHOD__ . " invalid png metadata" ); |
| 124 | |
| 125 | return self::METADATA_BAD; |
| 126 | } |
| 127 | |
| 128 | if ( !isset( $data['metadata']['_MW_PNG_VERSION'] ) |
| 129 | || $data['metadata']['_MW_PNG_VERSION'] !== PNGMetadataExtractor::VERSION |
| 130 | ) { |
| 131 | wfDebug( __METHOD__ . " old but compatible png metadata" ); |
| 132 | |
| 133 | return self::METADATA_COMPATIBLE; |
| 134 | } |
| 135 | |
| 136 | return self::METADATA_GOOD; |
| 137 | } |
| 138 | |
| 139 | /** |
| 140 | * @param File $image |
| 141 | * @return string |
| 142 | */ |
| 143 | public function getLongDesc( $image ) { |
| 144 | global $wgLang; |
| 145 | $original = parent::getLongDesc( $image ); |
| 146 | |
| 147 | $metadata = $image->getMetadataArray(); |
| 148 | |
| 149 | if ( !$metadata || isset( $metadata['_error'] ) || $metadata['frameCount'] <= 0 ) { |
| 150 | return $original; |
| 151 | } |
| 152 | |
| 153 | $info = []; |
| 154 | $info[] = $original; |
| 155 | |
| 156 | if ( $metadata['loopCount'] == 0 ) { |
| 157 | $info[] = wfMessage( 'file-info-png-looped' )->parse(); |
| 158 | } elseif ( $metadata['loopCount'] > 1 ) { |
| 159 | $info[] = wfMessage( 'file-info-png-repeat' )->numParams( $metadata['loopCount'] )->parse(); |
| 160 | } |
| 161 | |
| 162 | if ( $metadata['frameCount'] > 0 ) { |
| 163 | $info[] = wfMessage( 'file-info-png-frames' )->numParams( $metadata['frameCount'] )->parse(); |
| 164 | } |
| 165 | |
| 166 | if ( $metadata['duration'] ) { |
| 167 | $info[] = $wgLang->formatTimePeriod( $metadata['duration'] ); |
| 168 | } |
| 169 | |
| 170 | return $wgLang->commaList( $info ); |
| 171 | } |
| 172 | |
| 173 | /** |
| 174 | * Return the duration of an APNG file. |
| 175 | * |
| 176 | * Shown in the &query=imageinfo&iiprop=size api query. |
| 177 | * |
| 178 | * @param File $file |
| 179 | * @return float The duration of the file. |
| 180 | */ |
| 181 | public function getLength( $file ) { |
| 182 | $metadata = $file->getMetadataArray(); |
| 183 | |
| 184 | if ( !$metadata || !isset( $metadata['duration'] ) || !$metadata['duration'] ) { |
| 185 | return 0.0; |
| 186 | } |
| 187 | |
| 188 | return (float)$metadata['duration']; |
| 189 | } |
| 190 | |
| 191 | // PNGs should be easy to support, but it will need some sharpening applied |
| 192 | // and another user test to check if the perceived quality change is noticeable |
| 193 | public function supportsBucketing() { |
| 194 | return false; |
| 195 | } |
| 196 | } |