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<?php
/**
* Handler for PNG 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 PNG images.
*
* @ingroup Media
*/
class PNGHandler extends BitmapHandler {
const BROKEN_FILE = '0';
/**
* @param File $image
* @param string $filename
* @return string
*/
function getMetadata( $image, $filename ) {
try {
$metadata = BitmapMetadataHandler::PNG( $filename );
} catch ( Exception $e ) {
// Broken file?
wfDebug( __METHOD__ . ': ' . $e->getMessage() . "\n" );
return self::BROKEN_FILE;
}
return serialize( $metadata );
}
/**
* @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 );
}
/**
* Get a file type independent array of metadata.
*
* @param File $image
* @return array The metadata array
*/
public function getCommonMetaArray( File $image ) {
$meta = $image->getMetadata();
if ( !$meta ) {
return [];
}
$meta = unserialize( $meta );
if ( !isset( $meta['metadata'] ) ) {
return [];
}
unset( $meta['metadata']['_MW_PNG_VERSION'] );
return $meta['metadata'];
}
/**
* @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 do not support making APNG thumbnails, so always false
* @param File $image
* @return bool False
*/
function canAnimateThumbnail( $image ) {
return false;
}
function getMetadataType( $image ) {
return 'parsed-png';
}
function isMetadataValid( $image, $metadata ) {
if ( $metadata === self::BROKEN_FILE ) {
// Do not repetitivly regenerate metadata on broken file.
return self::METADATA_GOOD;
}
MediaWiki\suppressWarnings();
$data = unserialize( $metadata );
MediaWiki\restoreWarnings();
if ( !$data || !is_array( $data ) ) {
wfDebug( __METHOD__ . " invalid png metadata\n" );
return self::METADATA_BAD;
}
if ( !isset( $data['metadata']['_MW_PNG_VERSION'] )
|| $data['metadata']['_MW_PNG_VERSION'] != PNGMetadataExtractor::VERSION
) {
wfDebug( __METHOD__ . " old but compatible png metadata\n" );
return self::METADATA_COMPATIBLE;
}
return self::METADATA_GOOD;
}
/**
* @param File $image
* @return string
*/
function getLongDesc( $image ) {
global $wgLang;
$original = parent::getLongDesc( $image );
MediaWiki\suppressWarnings();
$metadata = unserialize( $image->getMetadata() );
MediaWiki\restoreWarnings();
if ( !$metadata || $metadata['frameCount'] <= 0 ) {
return $original;
}
$info = [];
$info[] = $original;
if ( $metadata['loopCount'] == 0 ) {
$info[] = wfMessage( 'file-info-png-looped' )->parse();
} elseif ( $metadata['loopCount'] > 1 ) {
$info[] = wfMessage( 'file-info-png-repeat' )->numParams( $metadata['loopCount'] )->parse();
}
if ( $metadata['frameCount'] > 0 ) {
$info[] = wfMessage( 'file-info-png-frames' )->numParams( $metadata['frameCount'] )->parse();
}
if ( $metadata['duration'] ) {
$info[] = $wgLang->formatTimePeriod( $metadata['duration'] );
}
return $wgLang->commaList( $info );
}
/**
* Return the duration of an APNG file.
*
* Shown in the &query=imageinfo&iiprop=size api query.
*
* @param File $file
* @return float The duration of the file.
*/
public function getLength( $file ) {
$serMeta = $file->getMetadata();
MediaWiki\suppressWarnings();
$metadata = unserialize( $serMeta );
MediaWiki\restoreWarnings();
if ( !$metadata || !isset( $metadata['duration'] ) || !$metadata['duration'] ) {
return 0.0;
} else {
return (float)$metadata['duration'];
}
}
// PNGs should be easy to support, but it will need some sharpening applied
// and another user test to check if the perceived quality change is noticeable
public function supportsBucketing() {
return false;
}
}