includes/media/SVG.php

   1 <?php
   2 /**
   3  * Handler for SVG images.
   4  *
   5  * This program is free software; you can redistribute it and/or modify
   6  * it under the terms of the GNU General Public License as published by
   7  * the Free Software Foundation; either version 2 of the License, or
   8  * (at your option) any later version.
   9  *
  10  * This program is distributed in the hope that it will be useful,
  11  * but WITHOUT ANY WARRANTY; without even the implied warranty of
  12  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
  13  * GNU General Public License for more details.
  14  *
  15  * You should have received a copy of the GNU General Public License along
  16  * with this program; if not, write to the Free Software Foundation, Inc.,
  17  * 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301, USA.
  18  * http://www.gnu.org/copyleft/gpl.html
  19  *
  20  * @file
  21  * @ingroup Media
  22  */
  23
  24 /**
  25  * Handler for SVG images.
  26  *
  27  * @ingroup Media
  28  */
  29 class SvgHandler extends ImageHandler {
  30         const SVG_METADATA_VERSION = 2;
  31
  32         function isEnabled() {
  33                 global $wgSVGConverters, $wgSVGConverter;
  34                 if ( !isset( $wgSVGConverters[$wgSVGConverter] ) ) {
  35                         wfDebug( "\$wgSVGConverter is invalid, disabling SVG rendering.\n" );
  36                         return false;
  37                 } else {
  38                         return true;
  39                 }
  40         }
  41
  42         function mustRender( $file ) {
  43                 return true;
  44         }
  45
  46         function isVectorized( $file ) {
  47                 return true;
  48         }
  49
  50         /**
  51          * @param $file File
  52          * @return bool
  53          */
  54         function isAnimatedImage( $file ) {
  55                 # TODO: detect animated SVGs
  56                 $metadata = $file->getMetadata();
  57                 if ( $metadata ) {
  58                         $metadata = $this->unpackMetadata( $metadata );
  59                         if( isset( $metadata['animated'] ) ) {
  60                                 return $metadata['animated'];
  61                         }
  62                 }
  63                 return false;
  64         }
  65
  66         /**
  67          * We do not support making animated svg thumbnails
  68          */
  69         function canAnimateThumb( $file ) {
  70                 return false;
  71         }
  72
  73         /**
  74          * @param $image File
  75          * @param  $params
  76          * @return bool
  77          */
  78         function normaliseParams( $image, &$params ) {
  79                 global $wgSVGMaxSize;
  80                 if ( !parent::normaliseParams( $image, $params ) ) {
  81                         return false;
  82                 }
  83                 # Don't make an image bigger than wgMaxSVGSize on the smaller side
  84                 if ( $params['physicalWidth'] <= $params['physicalHeight'] ) {
  85                         if ( $params['physicalWidth'] > $wgSVGMaxSize ) {
  86                                 $srcWidth = $image->getWidth( $params['page'] );
  87                                 $srcHeight = $image->getHeight( $params['page'] );
  88                                 $params['physicalWidth'] = $wgSVGMaxSize;
  89                                 $params['physicalHeight'] = File::scaleHeight( $srcWidth, $srcHeight, $wgSVGMaxSize );
  90                         }
  91                 } else {
  92                         if ( $params['physicalHeight'] > $wgSVGMaxSize ) {
  93                                 $srcWidth = $image->getWidth( $params['page'] );
  94                                 $srcHeight = $image->getHeight( $params['page'] );
  95                                 $params['physicalWidth'] = File::scaleHeight( $srcHeight, $srcWidth, $wgSVGMaxSize );
  96                                 $params['physicalHeight'] = $wgSVGMaxSize;
  97                         }
  98                 }
  99                 return true;
 100         }
 101
 102         /**
 103          * @param $image File
 104          * @param  $dstPath
 105          * @param  $dstUrl
 106          * @param  $params
 107          * @param int $flags
 108          * @return bool|MediaTransformError|ThumbnailImage|TransformParameterError
 109          */
 110         function doTransform( $image, $dstPath, $dstUrl, $params, $flags = 0 ) {
 111                 if ( !$this->normaliseParams( $image, $params ) ) {
 112                         return new TransformParameterError( $params );
 113                 }
 114                 $clientWidth = $params['width'];
 115                 $clientHeight = $params['height'];
 116                 $physicalWidth = $params['physicalWidth'];
 117                 $physicalHeight = $params['physicalHeight'];
 118
 119                 if ( $flags & self::TRANSFORM_LATER ) {
 120                         return new ThumbnailImage( $image, $dstUrl, $clientWidth, $clientHeight, $dstPath );
 121                 }
 122
 123                 if ( !wfMkdirParents( dirname( $dstPath ), null, __METHOD__ ) ) {
 124                         return new MediaTransformError( 'thumbnail_error', $clientWidth, $clientHeight,
 125                                 wfMessage( 'thumbnail_dest_directory' )->text() );
 126                 }
 127
 128                 $srcPath = $image->getLocalRefPath();
 129                 $status = $this->rasterize( $srcPath, $dstPath, $physicalWidth, $physicalHeight );
 130                 if( $status === true ) {
 131                         return new ThumbnailImage( $image, $dstUrl, $clientWidth, $clientHeight, $dstPath );
 132                 } else {
 133                         return $status; // MediaTransformError
 134                 }
 135         }
 136
 137         /**
 138         * Transform an SVG file to PNG
 139         * This function can be called outside of thumbnail contexts
 140         * @param string $srcPath
 141         * @param string $dstPath
 142         * @param string $width
 143         * @param string $height
 144         * @return bool|MediaTransformError
 145         */
 146         public function rasterize( $srcPath, $dstPath, $width, $height ) {
 147                 global $wgSVGConverters, $wgSVGConverter, $wgSVGConverterPath;
 148                 $err = false;
 149                 $retval = '';
 150                 if ( isset( $wgSVGConverters[$wgSVGConverter] ) ) {
 151                         if ( is_array( $wgSVGConverters[$wgSVGConverter] ) ) {
 152                                 // This is a PHP callable
 153                                 $func = $wgSVGConverters[$wgSVGConverter][0];
 154                                 $args = array_merge( array( $srcPath, $dstPath, $width, $height ),
 155                                         array_slice( $wgSVGConverters[$wgSVGConverter], 1 ) );
 156                                 if ( !is_callable( $func ) ) {
 157                                         throw new MWException( "$func is not callable" );
 158                                 }
 159                                 $err = call_user_func_array( $func, $args );
 160                                 $retval = (bool)$err;
 161                         } else {
 162                                 // External command
 163                                 $cmd = str_replace(
 164                                         array( '$path/', '$width', '$height', '$input', '$output' ),
 165                                         array( $wgSVGConverterPath ? wfEscapeShellArg( "$wgSVGConverterPath/" ) : "",
 166                                                    intval( $width ),
 167                                                    intval( $height ),
 168                                                    wfEscapeShellArg( $srcPath ),
 169                                                    wfEscapeShellArg( $dstPath ) ),
 170                                         $wgSVGConverters[$wgSVGConverter]
 171                                 ) . " 2>&1";
 172                                 wfProfileIn( 'rsvg' );
 173                                 wfDebug( __METHOD__.": $cmd\n" );
 174                                 $err = wfShellExec( $cmd, $retval );
 175                                 wfProfileOut( 'rsvg' );
 176                         }
 177                 }
 178                 $removed = $this->removeBadFile( $dstPath, $retval );
 179                 if ( $retval != 0 || $removed ) {
 180                         wfDebugLog( 'thumbnail', sprintf( 'thumbnail failed on %s: error %d "%s" from "%s"',
 181                                         wfHostname(), $retval, trim($err), $cmd ) );
 182                         return new MediaTransformError( 'thumbnail_error', $width, $height, $err );
 183                 }
 184                 return true;
 185         }
 186
 187         public static function rasterizeImagickExt( $srcPath, $dstPath, $width, $height ) {
 188                 $im = new Imagick( $srcPath );
 189                 $im->setImageFormat( 'png' );
 190                 $im->setBackgroundColor( 'transparent' );
 191                 $im->setImageDepth( 8 );
 192
 193                 if ( !$im->thumbnailImage( intval( $width ), intval( $height ), /* fit */ false ) ) {
 194                         return 'Could not resize image';
 195                 }
 196                 if ( !$im->writeImage( $dstPath ) ) {
 197                         return "Could not write to $dstPath";
 198                 }
 199         }
 200
 201         /**
 202          * @param $file File
 203          * @param  $path
 204          * @param bool $metadata
 205          * @return array
 206          */
 207         function getImageSize( $file, $path, $metadata = false ) {
 208                 if ( $metadata === false ) {
 209                         $metadata = $file->getMetaData();
 210                 }
 211                 $metadata = $this->unpackMetaData( $metadata );
 212
 213                 if ( isset( $metadata['width'] ) && isset( $metadata['height'] ) ) {
 214                         return array( $metadata['width'], $metadata['height'], 'SVG',
 215                                         "width=\"{$metadata['width']}\" height=\"{$metadata['height']}\"" );
 216                 }
 217         }
 218
 219         function getThumbType( $ext, $mime, $params = null ) {
 220                 return array( 'png', 'image/png' );
 221         }
 222
 223         /**
 224          * Subtitle for the image. Different from the base
 225          * class so it can be denoted that SVG's have
 226          * a "nominal" resolution, and not a fixed one,
 227          * as well as so animation can be denoted.
 228          *
 229          * @param $file File
 230          * @return string
 231          */
 232         function getLongDesc( $file ) {
 233                 global $wgLang;
 234                 $size = $wgLang->formatSize( $file->getSize() );
 235
 236                 if ( $this->isAnimatedImage( $file ) ) {
 237                         $msg = wfMessage( 'svg-long-desc-animated' );
 238                 } else {
 239                         $msg = wfMessage( 'svg-long-desc' );
 240                 }
 241
 242                 $msg->numParams(
 243                         $file->getWidth(),
 244                         $file->getHeight()
 245                 );
 246                 $msg->Params( $size );
 247                 return $msg->parse();
 248         }
 249
 250         function getMetadata( $file, $filename ) {
 251                 try {
 252                         $metadata = SVGMetadataExtractor::getMetadata( $filename );
 253                 } catch( Exception $e ) {
 254                         // Broken file?
 255                         wfDebug( __METHOD__ . ': ' . $e->getMessage() . "\n" );
 256                         return '0';
 257                 }
 258                 $metadata['version'] = self::SVG_METADATA_VERSION;
 259                 return serialize( $metadata );
 260         }
 261
 262         function unpackMetadata( $metadata ) {
 263                 wfSuppressWarnings();
 264                 $unser = unserialize( $metadata );
 265                 wfRestoreWarnings();
 266                 if ( isset( $unser['version'] ) && $unser['version'] == self::SVG_METADATA_VERSION ) {
 267                         return $unser;
 268                 } else {
 269                         return false;
 270                 }
 271         }
 272
 273         function getMetadataType( $image ) {
 274                 return 'parsed-svg';
 275         }
 276
 277         function isMetadataValid( $image, $metadata ) {
 278                 return $this->unpackMetadata( $metadata ) !== false;
 279         }
 280
 281         function visibleMetadataFields() {
 282                 $fields = array( 'objectname', 'imagedescription' );
 283                 return $fields;
 284         }
 285
 286         /**
 287          * @param $file File
 288          * @return array|bool
 289          */
 290         function formatMetadata( $file ) {
 291                 $result = array(
 292                         'visible' => array(),
 293                         'collapsed' => array()
 294                 );
 295                 $metadata = $file->getMetadata();
 296                 if ( !$metadata ) {
 297                         return false;
 298                 }
 299                 $metadata = $this->unpackMetadata( $metadata );
 300                 if ( !$metadata ) {
 301                         return false;
 302                 }
 303
 304                 /* TODO: add a formatter
 305                 $format = new FormatSVG( $metadata );
 306                 $formatted = $format->getFormattedData();
 307                 */
 308
 309                 // Sort fields into visible and collapsed
 310                 $visibleFields = $this->visibleMetadataFields();
 311
 312                 // Rename fields to be compatible with exif, so that
 313                 // the labels for these fields work and reuse existing messages.
 314                 $conversion = array(
 315                         'width' => 'imagewidth',
 316                         'height' => 'imagelength',
 317                         'description' => 'imagedescription',
 318                         'title' => 'objectname',
 319                 );
 320                 foreach ( $metadata as $name => $value ) {
 321                         $tag = strtolower( $name );
 322                         if ( isset( $conversion[$tag] ) ) {
 323                                 $tag = $conversion[$tag];
 324                         } else {
 325                                 // Do not output other metadata not in list
 326                                 continue;
 327                         }
 328                         self::addMeta( $result,
 329                                 in_array( $tag, $visibleFields ) ? 'visible' : 'collapsed',
 330                                 'exif',
 331                                 $tag,
 332                                 $value
 333                         );
 334                 }
 335                 return $result;
 336         }
 337 }