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         /**
  36          * @param $image File
  37          * @param  $width
  38          * @param  $height
  39          * @return
  40          */
  41         function getImageArea( $image, $width, $height ) {
  42                 $ser = $image->getMetadata();
  43                 if ($ser) {
  44                         $metadata = unserialize($ser);
  45                         return $width * $height * $metadata['frameCount'];
  46                 } else {
  47                         return $width * $height;
  48                 }
  49         }
  50
  51         /**
  52          * @param $image File
  53          * @return bool
  54          */
  55         function isAnimatedImage( $image ) {
  56                 $ser = $image->getMetadata();
  57                 if ($ser) {
  58                         $metadata = unserialize($ser);
  59                         if( $metadata['frameCount'] > 1 ) return true;
  60                 }
  61                 return false;
  62         }
  63
  64         function getMetadataType( $image ) {
  65                 return 'parsed-gif';
  66         }
  67
  68         function isMetadataValid( $image, $metadata ) {
  69                 wfSuppressWarnings();
  70                 $data = unserialize( $metadata );
  71                 wfRestoreWarnings();
  72                 return (boolean) $data;
  73         }
  74
  75         /**
  76          * @param $image File
  77          * @return string
  78          */
  79         function getLongDesc( $image ) {
  80                 global $wgLang;
  81
  82                 $original = parent::getLongDesc( $image );
  83
  84                 wfSuppressWarnings();
  85                 $metadata = unserialize($image->getMetadata());
  86                 wfRestoreWarnings();
  87
  88                 if (!$metadata || $metadata['frameCount'] <=  1)
  89                         return $original;
  90
  91                 /* Preserve original image info string, but strip the last char ')' so we can add even more */
  92                 $info = array();
  93                 $info[] = $original;
  94
  95                 if ($metadata['looped'])
  96                         $info[] = wfMsgExt( 'file-info-gif-looped', 'parseinline' );
  97
  98                 if ($metadata['frameCount'] > 1)
  99                         $info[] = wfMsgExt( 'file-info-gif-frames', 'parseinline', $metadata['frameCount'] );
 100
 101                 if ($metadata['duration'])
 102                         $info[] = $wgLang->formatTimePeriod( $metadata['duration'] );
 103
 104                 return $wgLang->commaList( $info );
 105         }
 106 }