PNG.php

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<?php
class PNGHandler extends BitmapHandler {

        const BROKEN_FILE = '0';

        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);
        }

        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_PNG_VERSION'] ) ) {
                        unset( $meta['metadata']['_MW_PNG_VERSION'] );
                }
                return $this->formatMetadataHelper( $meta['metadata'] );
        }

        function isAnimatedImage( $image ) {
                $ser = $image->getMetadata();
                if ($ser) {
                        $metadata = unserialize($ser);
                        if( $metadata['frameCount'] > 1 ) return true;
                }
                return 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;
                }

                wfSuppressWarnings();
                $data = unserialize( $metadata );
                wfRestoreWarnings();

                if ( !$data || !is_array( $data ) ) {
                        wfDebug(__METHOD__ . ' invalid png metadata' );
                        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' );
                        return self::METADATA_COMPATIBLE;
                }
                return self::METADATA_GOOD;
        }

        function getLongDesc( $image ) {
                global $wgLang;
                $original = parent::getLongDesc( $image );

                wfSuppressWarnings();
                $metadata = unserialize($image->getMetadata());
                wfRestoreWarnings();

                if( !$metadata || $metadata['frameCount'] <= 0 )
                        return $original;

                $info = array();
                $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 );
        }

}