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         function formatMetadata( $image ) {
  31                 return false;
  32         }
  33
  34         /**
  35          * @param $image File
  36          * @param  $width
  37          * @param  $height
  38          * @return
  39          */
  40         function getImageArea( $image, $width, $height ) {
  41                 $ser = $image->getMetadata();
  42                 if ( $ser ) {
  43                         $metadata = unserialize( $ser );
  44                         return $width * $height * $metadata['frameCount'];
  45                 } else {
  46                         return $width * $height;
  47                 }
  48         }
  49
  50         /**
  51          * @param $image File
  52          * @return bool
  53          */
  54         function isAnimatedImage( $image ) {
  55                 $ser = $image->getMetadata();
  56                 if ( $ser ) {
  57                         $metadata = unserialize($ser);
  58                         if( $metadata['frameCount'] > 1 ) {
  59                                 return true;
  60                         }
  61                 }
  62                 return false;
  63         }
  64
  65         function getMetadataType( $image ) {
  66                 return 'parsed-gif';
  67         }
  68
  69         function isMetadataValid( $image, $metadata ) {
  70                 wfSuppressWarnings();
  71                 $data = unserialize( $metadata );
  72                 wfRestoreWarnings();
  73                 return (boolean) $data;
  74         }
  75
  76         /**
  77          * @param $image File
  78          * @return string
  79          */
  80         function getLongDesc( $image ) {
  81                 global $wgLang;
  82
  83                 $original = parent::getLongDesc( $image );
  84
  85                 wfSuppressWarnings();
  86                 $metadata = unserialize($image->getMetadata());
  87                 wfRestoreWarnings();
  88
  89                 if (!$metadata || $metadata['frameCount'] <=  1) {
  90                         return $original;
  91                 }
  92
  93                 /* Preserve original image info string, but strip the last char ')' so we can add even more */
  94                 $info = array();
  95                 $info[] = $original;
  96
  97                 if ( $metadata['looped'] ) {
  98                         $info[] = wfMsgExt( 'file-info-gif-looped', 'parseinline' );
  99                 }
 100
 101                 if ( $metadata['frameCount'] > 1 ) {
 102                         $info[] = wfMsgExt( 'file-info-gif-frames', 'parseinline', $metadata['frameCount'] );
 103                 }
 104
 105                 if ( $metadata['duration'] ) {
 106                         $info[] = $wgLang->formatTimePeriod( $metadata['duration'] );
 107                 }
 108
 109                 return $wgLang->commaList( $info );
 110         }
 111 }