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<?php
/**
* Handler for GIF images.
*
* This program is free software; you can redistribute it and/or modify
* it under the terms of the GNU General Public License as published by
* the Free Software Foundation; either version 2 of the License, or
* (at your option) any later version.
*
* This program is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
* GNU General Public License for more details.
*
* You should have received a copy of the GNU General Public License along
* with this program; if not, write to the Free Software Foundation, Inc.,
* 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301, USA.
* http://www.gnu.org/copyleft/gpl.html
*
* @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 File $image
* @param bool|IContextSource $context Context to use (optional)
* @return array|bool
*/
function formatMetadata( $image, $context = false ) {
$meta = $this->getCommonMetaArray( $image );
if ( count( $meta ) === 0 ) {
return false;
}
return $this->formatMetadataHelper( $meta, $context );
}
/**
* Return the standard metadata elements for #filemetadata parser func.
* @param File $image
* @return array|bool
*/
public function getCommonMetaArray( File $image ) {
$meta = $image->getMetadata();
if ( !$meta ) {
return array();
}
$meta = unserialize( $meta );
if ( !isset( $meta['metadata'] ) ) {
return array();
}
unset( $meta['metadata']['_MW_GIF_VERSION'] );
return $meta['metadata'];
}
/**
* @todo Add unit tests
*
* @param File $image
* @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 File $image
* @return bool
*/
function isAnimatedImage( $image ) {
$ser = $image->getMetadata();
if ( $ser ) {
$metadata = unserialize( $ser );
if ( $metadata['frameCount'] > 1 ) {
return true;
}
}
return false;
}
/**
* We cannot animate thumbnails that are bigger than a particular size
* @param File $file
* @return bool
*/
function canAnimateThumbnail( $file ) {
global $wgMaxAnimatedGifArea;
$answer = $this->getImageArea( $file ) <= $wgMaxAnimatedGifArea;
return $answer;
}
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\n" );
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\n" );
return self::METADATA_COMPATIBLE;
}
return self::METADATA_GOOD;
}
/**
* @param File $image
* @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[] = wfMessage( 'file-info-gif-looped' )->parse();
}
if ( $metadata['frameCount'] > 1 ) {
$info[] = wfMessage( 'file-info-gif-frames' )->numParams( $metadata['frameCount'] )->parse();
}
if ( $metadata['duration'] ) {
$info[] = $wgLang->formatTimePeriod( $metadata['duration'] );
}
return $wgLang->commaList( $info );
}
}
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