includes/media/GIF.php

   1 <?php
   2 /**
   3  * Handler for GIF images.
   4  *
   5  * @file
   6  * @ingroup Media
   7  */
   8
   9 /**
  10  * Handler for GIF images.
  11  *
  12  * @ingroup Media
  13  */
  14 class GIFHandler extends BitmapHandler {
  15
  16         function getMetadata( $image, $filename ) {
  17                 if ( !isset( $image->parsedGIFMetadata ) ) {
  18                         try {
  19                                 $image->parsedGIFMetadata = GIFMetadataExtractor::getMetadata( $filename );
  20                         } catch( Exception $e ) {
  21                                 // Broken file?
  22                                 wfDebug( __METHOD__ . ': ' . $e->getMessage() . "\n" );
  23                                 return '0';
  24                         }
  25                 }
  26
  27                 return serialize( $image->parsedGIFMetadata );
  28
  29         }
  30
  31         function formatMetadata( $image ) {
  32                 return false;
  33         }
  34
  35         function getImageArea( $image, $width, $height ) {
  36                 $ser = $image->getMetadata();
  37                 if ($ser) {
  38                         $metadata = unserialize($ser);
  39                         return $width * $height * $metadata['frameCount'];
  40                 } else {
  41                         return $width * $height;
  42                 }
  43         }
  44
  45         function isAnimatedImage( $image ) {
  46                 $ser = $image->getMetadata();
  47                 if ($ser) {
  48                         $metadata = unserialize($ser);
  49                         if( $metadata['frameCount'] > 1 ) return true;
  50                 }
  51                 return false;
  52         }
  53
  54         function getMetadataType( $image ) {
  55                 return 'parsed-gif';
  56         }
  57
  58         function isMetadataValid( $image, $metadata ) {
  59                 wfSuppressWarnings();
  60                 $data = unserialize( $metadata );
  61                 wfRestoreWarnings();
  62                 return (boolean) $data;
  63         }
  64
  65         function getLongDesc( $image ) {
  66                 global $wgLang;
  67
  68                 $original = parent::getLongDesc( $image );
  69
  70                 wfSuppressWarnings();
  71                 $metadata = unserialize($image->getMetadata());
  72                 wfRestoreWarnings();
  73
  74                 if (!$metadata || $metadata['frameCount'] <=  1)
  75                         return $original;
  76
  77                 /* Preserve original image info string, but strip the last char ')' so we can add even more */
  78                 $info = array();
  79                 $info[] = substr( $original, 1, strlen( $original )-2 );
  80
  81                 if ($metadata['looped'])
  82                         $info[] = wfMsgExt( 'file-info-gif-looped', 'parseinline' );
  83
  84                 if ($metadata['frameCount'] > 1)
  85                         $info[] = wfMsgExt( 'file-info-gif-frames', 'parseinline', $metadata['frameCount'] );
  86
  87                 if ($metadata['duration'])
  88                         $info[] = $wgLang->formatTimePeriod( $metadata['duration'] );
  89
  90                 $infoString = $wgLang->commaList( $info );
  91
  92                 return "($infoString)";
  93         }
  94 }