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<?php
/**
* Handler for SVG images.
*
* @file
* @ingroup Media
*/
/**
* Handler for SVG images.
*
* @ingroup Media
*/
class SvgHandler extends ImageHandler {
const SVG_METADATA_VERSION = 2;
function isEnabled() {
global $wgSVGConverters, $wgSVGConverter;
if ( !isset( $wgSVGConverters[$wgSVGConverter] ) ) {
wfDebug( "\$wgSVGConverter is invalid, disabling SVG rendering.\n" );
return false;
} else {
return true;
}
}
function mustRender( $file ) {
return true;
}
function isVectorized( $file ) {
return true;
}
function isAnimatedImage( $file ) {
# TODO: detect animated SVGs
$metadata = $file->getMetadata();
if ( $metadata ) {
$metadata = $this->unpackMetadata( $metadata );
if( isset( $metadata['animated'] ) ) {
return $metadata['animated'];
}
}
return false;
}
function normaliseParams( $image, &$params ) {
global $wgSVGMaxSize;
if ( !parent::normaliseParams( $image, $params ) ) {
return false;
}
# Don't make an image bigger than wgMaxSVGSize on the smaller side
$params['physicalWidth'] = $params['width'];
$params['physicalHeight'] = $params['height'];
if ( $params['physicalWidth'] <= $params['physicalHeight'] ) {
if ( $params['physicalWidth'] > $wgSVGMaxSize ) {
$srcWidth = $image->getWidth( $params['page'] );
$srcHeight = $image->getHeight( $params['page'] );
$params['physicalWidth'] = $wgSVGMaxSize;
$params['physicalHeight'] = File::scaleHeight( $srcWidth, $srcHeight, $wgSVGMaxSize );
}
} else {
if ( $params['physicalHeight'] > $wgSVGMaxSize ) {
$srcWidth = $image->getWidth( $params['page'] );
$srcHeight = $image->getHeight( $params['page'] );
$params['physicalWidth'] = File::scaleHeight( $srcHeight, $srcWidth, $wgSVGMaxSize );
$params['physicalHeight'] = $wgSVGMaxSize;
}
}
return true;
}
function doTransform( $image, $dstPath, $dstUrl, $params, $flags = 0 ) {
if ( !$this->normaliseParams( $image, $params ) ) {
return new TransformParameterError( $params );
}
$clientWidth = $params['width'];
$clientHeight = $params['height'];
$physicalWidth = $params['physicalWidth'];
$physicalHeight = $params['physicalHeight'];
$srcPath = $image->getPath();
if ( $flags & self::TRANSFORM_LATER ) {
return new ThumbnailImage( $image, $dstUrl, $clientWidth, $clientHeight, $dstPath );
}
if ( !wfMkdirParents( dirname( $dstPath ) ) ) {
return new MediaTransformError( 'thumbnail_error', $clientWidth, $clientHeight,
wfMsg( 'thumbnail_dest_directory' ) );
}
$status = $this->rasterize( $srcPath, $dstPath, $physicalWidth, $physicalHeight );
if( $status === true ) {
return new ThumbnailImage( $image, $dstUrl, $clientWidth, $clientHeight, $dstPath );
} else {
return $status; // MediaTransformError
}
}
/*
* Transform an SVG file to PNG
* This function can be called outside of thumbnail contexts
* @param string $srcPath
* @param string $dstPath
* @param string $width
* @param string $height
* @returns TRUE/MediaTransformError
*/
public function rasterize( $srcPath, $dstPath, $width, $height ) {
global $wgSVGConverters, $wgSVGConverter, $wgSVGConverterPath;
$err = false;
$retval = '';
if ( isset( $wgSVGConverters[$wgSVGConverter] ) ) {
$cmd = str_replace(
array( '$path/', '$width', '$height', '$input', '$output' ),
array( $wgSVGConverterPath ? wfEscapeShellArg( "$wgSVGConverterPath/" ) : "",
intval( $width ),
intval( $height ),
wfEscapeShellArg( $srcPath ),
wfEscapeShellArg( $dstPath ) ),
$wgSVGConverters[$wgSVGConverter]
) . " 2>&1";
wfProfileIn( 'rsvg' );
wfDebug( __METHOD__.": $cmd\n" );
$err = wfShellExec( $cmd, $retval );
wfProfileOut( 'rsvg' );
}
$removed = $this->removeBadFile( $dstPath, $retval );
if ( $retval != 0 || $removed ) {
wfDebugLog( 'thumbnail', sprintf( 'thumbnail failed on %s: error %d "%s" from "%s"',
wfHostname(), $retval, trim($err), $cmd ) );
return new MediaTransformError( 'thumbnail_error', $width, $height, $err );
}
return true;
}
function getImageSize( $file, $path, $metadata = false ) {
if ( $metadata === false ) {
$metadata = $file->getMetaData();
}
$metadata = $this->unpackMetaData( $metadata );
if ( isset( $metadata['width'] ) && isset( $metadata['height'] ) ) {
return array( $metadata['width'], $metadata['height'], 'SVG',
"width=\"{$metadata['width']}\" height=\"{$metadata['height']}\"" );
}
}
function getThumbType( $ext, $mime, $params = null ) {
return array( 'png', 'image/png' );
}
function getLongDesc( $file ) {
global $wgLang;
return wfMsgExt( 'svg-long-desc', 'parseinline',
$wgLang->formatNum( $file->getWidth() ),
$wgLang->formatNum( $file->getHeight() ),
$wgLang->formatSize( $file->getSize() ) );
}
function getMetadata( $file, $filename ) {
try {
$metadata = SVGMetadataExtractor::getMetadata( $filename );
} catch( Exception $e ) {
// Broken file?
wfDebug( __METHOD__ . ': ' . $e->getMessage() . "\n" );
return '0';
}
$metadata['version'] = self::SVG_METADATA_VERSION;
return serialize( $metadata );
}
function unpackMetadata( $metadata ) {
$unser = @unserialize( $metadata );
if ( isset( $unser['version'] ) && $unser['version'] == self::SVG_METADATA_VERSION ) {
return $unser;
} else {
return false;
}
}
function getMetadataType( $image ) {
return 'parsed-svg';
}
function isMetadataValid( $image, $metadata ) {
return $this->unpackMetadata( $metadata ) !== false;
}
function visibleMetadataFields() {
$fields = array( 'title', 'description', 'animated' );
return $fields;
}
function formatMetadata( $file ) {
$result = array(
'visible' => array(),
'collapsed' => array()
);
$metadata = $file->getMetadata();
if ( !$metadata ) {
return false;
}
$metadata = $this->unpackMetadata( $metadata );
if ( !$metadata ) {
return false;
}
unset( $metadata['version'] );
unset( $metadata['metadata'] ); /* non-formatted XML */
/* TODO: add a formatter
$format = new FormatSVG( $metadata );
$formatted = $format->getFormattedData();
*/
// Sort fields into visible and collapsed
$visibleFields = $this->visibleMetadataFields();
// Rename fields to be compatible with exif, so that
// the labels for these fields work.
$conversion = array( 'width' => 'imagewidth',
'height' => 'imagelength',
'description' => 'imagedescription',
'title' => 'objectname',
);
foreach ( $metadata as $name => $value ) {
$tag = strtolower( $name );
if ( isset( $conversion[$tag] ) ) {
$tag = $conversion[$tag];
}
self::addMeta( $result,
in_array( $tag, $visibleFields ) ? 'visible' : 'collapsed',
'exif',
$tag,
$value
);
}
return $result;
}
}
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