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<?php
/**
* Handler for GIF images.
*
* @file
* @ingroup Media
*/
/**
* Handler for GIF images.
*
* @ingroup Media
*/
class GIFHandler extends BitmapHandler {
const BROKEN_FILE = '0'; // value to store in img_metadata if error extracting metadata.
function getMetadata( $image, $filename ) {
try {
$parsedGIFMetadata = BitmapMetadataHandler::GIF( $filename );
} catch( Exception $e ) {
// Broken file?
wfDebug( __METHOD__ . ': ' . $e->getMessage() . "\n" );
return self::BROKEN_FILE;
}
return serialize($parsedGIFMetadata);
}
/**
* @param $image File
* @return array|bool
*/
function formatMetadata( $image ) {
$meta = $image->getMetadata();
if ( !$meta ) {
return false;
}
$meta = unserialize( $meta );
if ( !isset( $meta['metadata'] ) || count( $meta['metadata'] ) <= 1 ) {
return false;
}
if ( isset( $meta['metadata']['_MW_GIF_VERSION'] ) ) {
unset( $meta['metadata']['_MW_GIF_VERSION'] );
}
return $this->formatMetadataHelper( $meta['metadata'] );
}
/**
* @param $image File
* @todo unittests
* @return bool
*/
function getImageArea( $image ) {
$ser = $image->getMetadata();
if ( $ser ) {
$metadata = unserialize( $ser );
return $image->getWidth() * $image->getHeight() * $metadata['frameCount'];
} else {
return $image->getWidth() * $image->getHeight();
}
}
/**
* @param $image File
* @return bool
*/
function isAnimatedImage( $image ) {
$ser = $image->getMetadata();
if ( $ser ) {
$metadata = unserialize($ser);
if( $metadata['frameCount'] > 1 ) {
return true;
}
}
return false;
}
function getMetadataType( $image ) {
return 'parsed-gif';
}
function isMetadataValid( $image, $metadata ) {
if ( $metadata === self::BROKEN_FILE ) {
// Do not repetitivly regenerate metadata on broken file.
return self::METADATA_GOOD;
}
wfSuppressWarnings();
$data = unserialize( $metadata );
wfRestoreWarnings();
if ( !$data || !is_array( $data ) ) {
wfDebug(__METHOD__ . ' invalid GIF metadata' );
return self::METADATA_BAD;
}
if ( !isset( $data['metadata']['_MW_GIF_VERSION'] )
|| $data['metadata']['_MW_GIF_VERSION'] != GIFMetadataExtractor::VERSION ) {
wfDebug(__METHOD__ . ' old but compatible GIF metadata' );
return self::METADATA_COMPATIBLE;
}
return self::METADATA_GOOD;
}
/**
* @param $image File
* @return string
*/
function getLongDesc( $image ) {
global $wgLang;
$original = parent::getLongDesc( $image );
wfSuppressWarnings();
$metadata = unserialize($image->getMetadata());
wfRestoreWarnings();
if (!$metadata || $metadata['frameCount'] <= 1) {
return $original;
}
/* Preserve original image info string, but strip the last char ')' so we can add even more */
$info = array();
$info[] = $original;
if ( $metadata['looped'] ) {
$info[] = wfMsgExt( 'file-info-gif-looped', 'parseinline' );
}
if ( $metadata['frameCount'] > 1 ) {
$info[] = wfMsgExt( 'file-info-gif-frames', 'parseinline', $metadata['frameCount'] );
}
if ( $metadata['duration'] ) {
$info[] = $wgLang->formatTimePeriod( $metadata['duration'] );
}
return $wgLang->commaList( $info );
}
}
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