includes/media/GIF.php

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