includes/media/SVG.php

   1 <?php
   2 /**
   3  * Handler for SVG images.
   4  *
   5  * @file
   6  * @ingroup Media
   7  */
   8
   9 /**
  10  * Handler for SVG images.
  11  *
  12  * @ingroup Media
  13  */
  14 class SvgHandler extends ImageHandler {
  15         function isEnabled() {
  16                 global $wgSVGConverters, $wgSVGConverter;
  17                 if ( !isset( $wgSVGConverters[$wgSVGConverter] ) ) {
  18                         wfDebug( "\$wgSVGConverter is invalid, disabling SVG rendering.\n" );
  19                         return false;
  20                 } else {
  21                         return true;
  22                 }
  23         }
  24
  25         function mustRender( $file ) {
  26                 return true;
  27         }
  28
  29         function normaliseParams( $image, &$params ) {
  30                 global $wgSVGMaxSize;
  31                 if ( !parent::normaliseParams( $image, $params ) ) {
  32                         return false;
  33                 }
  34                 # Don't make an image bigger than wgMaxSVGSize
  35                 $params['physicalWidth'] = $params['width'];
  36                 $params['physicalHeight'] = $params['height'];
  37                 if ( $params['physicalWidth'] > $wgSVGMaxSize ) {
  38                         $srcWidth = $image->getWidth( $params['page'] );
  39                         $srcHeight = $image->getHeight( $params['page'] );
  40                         $params['physicalWidth'] = $wgSVGMaxSize;
  41                         $params['physicalHeight'] = File::scaleHeight( $srcWidth, $srcHeight, $wgSVGMaxSize );
  42                 }
  43                 return true;
  44         }
  45
  46         function doTransform( $image, $dstPath, $dstUrl, $params, $flags = 0 ) {
  47                 if ( !$this->normaliseParams( $image, $params ) ) {
  48                         return new TransformParameterError( $params );
  49                 }
  50                 $clientWidth = $params['width'];
  51                 $clientHeight = $params['height'];
  52                 $physicalWidth = $params['physicalWidth'];
  53                 $physicalHeight = $params['physicalHeight'];
  54                 $srcPath = $image->getPath();
  55
  56                 if ( $flags & self::TRANSFORM_LATER ) {
  57                         return new ThumbnailImage( $image, $dstUrl, $clientWidth, $clientHeight, $dstPath );
  58                 }
  59
  60                 if ( !wfMkdirParents( dirname( $dstPath ) ) ) {
  61                         return new MediaTransformError( 'thumbnail_error', $clientWidth, $clientHeight,
  62                                 wfMsg( 'thumbnail_dest_directory' ) );
  63                 }
  64
  65                 $status = $this->rasterize( $srcPath, $dstPath, $physicalWidth, $physicalHeight );
  66                 if( $status === true ) {
  67                         return new ThumbnailImage( $image, $dstUrl, $clientWidth, $clientHeight, $dstPath );
  68                 } else {
  69                         return $status; // MediaTransformError
  70                 }
  71         }
  72
  73         /*
  74         * Transform an SVG file to PNG
  75         * This function can be called outside of thumbnail contexts
  76         * @param string $srcPath
  77         * @param string $dstPath
  78         * @param string $width
  79         * @param string $height
  80         * @returns TRUE/MediaTransformError
  81         */
  82         public function rasterize( $srcPath, $dstPath, $width, $height ) {
  83                 global $wgSVGConverters, $wgSVGConverter, $wgSVGConverterPath;
  84                 $err = false;
  85                 if ( isset( $wgSVGConverters[$wgSVGConverter] ) ) {
  86                         $cmd = str_replace(
  87                                 array( '$path/', '$width', '$height', '$input', '$output' ),
  88                                 array( $wgSVGConverterPath ? wfEscapeShellArg( "$wgSVGConverterPath/" ) : "",
  89                                            intval( $width ),
  90                                            intval( $height ),
  91                                            wfEscapeShellArg( $srcPath ),
  92                                            wfEscapeShellArg( $dstPath ) ),
  93                                 $wgSVGConverters[$wgSVGConverter]
  94                         ) . " 2>&1";
  95                         wfProfileIn( 'rsvg' );
  96                         wfDebug( __METHOD__.": $cmd\n" );
  97                         $err = wfShellExec( $cmd, $retval );
  98                         wfProfileOut( 'rsvg' );
  99                 }
 100                 $removed = $this->removeBadFile( $dstPath, $retval );
 101                 if ( $retval != 0 || $removed ) {
 102                         wfDebugLog( 'thumbnail', sprintf( 'thumbnail failed on %s: error %d "%s" from "%s"',
 103                                         wfHostname(), $retval, trim($err), $cmd ) );
 104                         return new MediaTransformError( 'thumbnail_error', $width, $height, $err );
 105                 }
 106                 return true;
 107         }
 108
 109         function getImageSize( $image, $path ) {
 110                 return wfGetSVGsize( $path );
 111         }
 112
 113         function getThumbType( $ext, $mime, $params = null ) {
 114                 return array( 'png', 'image/png' );
 115         }
 116
 117         function getLongDesc( $file ) {
 118                 global $wgLang;
 119                 return wfMsgExt( 'svg-long-desc', 'parseinline',
 120                         $wgLang->formatNum( $file->getWidth() ),
 121                         $wgLang->formatNum( $file->getHeight() ),
 122                         $wgLang->formatSize( $file->getSize() ) );
 123         }
 124 }