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, $dstPath, $params );
 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, $dstPath, $params );
 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          * @throws MWException
 145          * @return bool|MediaTransformError
 146          */
 147         public function rasterize( $srcPath, $dstPath, $width, $height ) {
 148                 global $wgSVGConverters, $wgSVGConverter, $wgSVGConverterPath;
 149                 $err = false;
 150                 $retval = '';
 151                 if ( isset( $wgSVGConverters[$wgSVGConverter] ) ) {
 152                         if ( is_array( $wgSVGConverters[$wgSVGConverter] ) ) {
 153                                 // This is a PHP callable
 154                                 $func = $wgSVGConverters[$wgSVGConverter][0];
 155                                 $args = array_merge( array( $srcPath, $dstPath, $width, $height ),
 156                                         array_slice( $wgSVGConverters[$wgSVGConverter], 1 ) );
 157                                 if ( !is_callable( $func ) ) {
 158                                         throw new MWException( "$func is not callable" );
 159                                 }
 160                                 $err = call_user_func_array( $func, $args );
 161                                 $retval = (bool)$err;
 162                         } else {
 163                                 // External command
 164                                 $cmd = str_replace(
 165                                         array( '$path/', '$width', '$height', '$input', '$output' ),
 166                                         array( $wgSVGConverterPath ? wfEscapeShellArg( "$wgSVGConverterPath/" ) : "",
 167                                                    intval( $width ),
 168                                                    intval( $height ),
 169                                                    wfEscapeShellArg( $srcPath ),
 170                                                    wfEscapeShellArg( $dstPath ) ),
 171                                         $wgSVGConverters[$wgSVGConverter]
 172                                 ) . " 2>&1";
 173                                 wfProfileIn( 'rsvg' );
 174                                 wfDebug( __METHOD__.": $cmd\n" );
 175                                 $err = wfShellExec( $cmd, $retval );
 176                                 wfProfileOut( 'rsvg' );
 177                         }
 178                 }
 179                 $removed = $this->removeBadFile( $dstPath, $retval );
 180                 if ( $retval != 0 || $removed ) {
 181                         wfDebugLog( 'thumbnail', sprintf( 'thumbnail failed on %s: error %d "%s" from "%s"',
 182                                         wfHostname(), $retval, trim($err), $cmd ) );
 183                         return new MediaTransformError( 'thumbnail_error', $width, $height, $err );
 184                 }
 185                 return true;
 186         }
 187
 188         public static function rasterizeImagickExt( $srcPath, $dstPath, $width, $height ) {
 189                 $im = new Imagick( $srcPath );
 190                 $im->setImageFormat( 'png' );
 191                 $im->setBackgroundColor( 'transparent' );
 192                 $im->setImageDepth( 8 );
 193
 194                 if ( !$im->thumbnailImage( intval( $width ), intval( $height ), /* fit */ false ) ) {
 195                         return 'Could not resize image';
 196                 }
 197                 if ( !$im->writeImage( $dstPath ) ) {
 198                         return "Could not write to $dstPath";
 199                 }
 200         }
 201
 202         /**
 203          * @param $file File
 204          * @param  $path
 205          * @param bool $metadata
 206          * @return array
 207          */
 208         function getImageSize( $file, $path, $metadata = false ) {
 209                 if ( $metadata === false ) {
 210                         $metadata = $file->getMetaData();
 211                 }
 212                 $metadata = $this->unpackMetaData( $metadata );
 213
 214                 if ( isset( $metadata['width'] ) && isset( $metadata['height'] ) ) {
 215                         return array( $metadata['width'], $metadata['height'], 'SVG',
 216                                         "width=\"{$metadata['width']}\" height=\"{$metadata['height']}\"" );
 217                 }
 218         }
 219
 220         function getThumbType( $ext, $mime, $params = null ) {
 221                 return array( 'png', 'image/png' );
 222         }
 223
 224         /**
 225          * Subtitle for the image. Different from the base
 226          * class so it can be denoted that SVG's have
 227          * a "nominal" resolution, and not a fixed one,
 228          * as well as so animation can be denoted.
 229          *
 230          * @param $file File
 231          * @return string
 232          */
 233         function getLongDesc( $file ) {
 234                 global $wgLang;
 235                 $size = $wgLang->formatSize( $file->getSize() );
 236
 237                 if ( $this->isAnimatedImage( $file ) ) {
 238                         $msg = wfMessage( 'svg-long-desc-animated' );
 239                 } else {
 240                         $msg = wfMessage( 'svg-long-desc' );
 241                 }
 242
 243                 $msg->numParams(
 244                         $file->getWidth(),
 245                         $file->getHeight()
 246                 );
 247                 $msg->Params( $size );
 248                 return $msg->parse();
 249         }
 250
 251         function getMetadata( $file, $filename ) {
 252                 try {
 253                         $metadata = SVGMetadataExtractor::getMetadata( $filename );
 254                 } catch( Exception $e ) {
 255                         // Broken file?
 256                         wfDebug( __METHOD__ . ': ' . $e->getMessage() . "\n" );
 257                         return '0';
 258                 }
 259                 $metadata['version'] = self::SVG_METADATA_VERSION;
 260                 return serialize( $metadata );
 261         }
 262
 263         function unpackMetadata( $metadata ) {
 264                 wfSuppressWarnings();
 265                 $unser = unserialize( $metadata );
 266                 wfRestoreWarnings();
 267                 if ( isset( $unser['version'] ) && $unser['version'] == self::SVG_METADATA_VERSION ) {
 268                         return $unser;
 269                 } else {
 270                         return false;
 271                 }
 272         }
 273
 274         function getMetadataType( $image ) {
 275                 return 'parsed-svg';
 276         }
 277
 278         function isMetadataValid( $image, $metadata ) {
 279                 $meta = $this->unpackMetadata( $metadata );
 280                 if ( $meta === false ) {
 281                         return self::METADATA_BAD;
 282                 }
 283                 if ( !isset( $meta['originalWidth'] ) ) {
 284                         // Old but compatible
 285                         return self::METADATA_COMPATIBLE;
 286                 }
 287                 return self::METADATA_GOOD;
 288         }
 289
 290         function visibleMetadataFields() {
 291                 $fields = array( 'objectname', 'imagedescription' );
 292                 return $fields;
 293         }
 294
 295         /**
 296          * @param $file File
 297          * @return array|bool
 298          */
 299         function formatMetadata( $file ) {
 300                 $result = array(
 301                         'visible' => array(),
 302                         'collapsed' => array()
 303                 );
 304                 $metadata = $file->getMetadata();
 305                 if ( !$metadata ) {
 306                         return false;
 307                 }
 308                 $metadata = $this->unpackMetadata( $metadata );
 309                 if ( !$metadata ) {
 310                         return false;
 311                 }
 312
 313                 /* TODO: add a formatter
 314                 $format = new FormatSVG( $metadata );
 315                 $formatted = $format->getFormattedData();
 316                 */
 317
 318                 // Sort fields into visible and collapsed
 319                 $visibleFields = $this->visibleMetadataFields();
 320
 321                 // Rename fields to be compatible with exif, so that
 322                 // the labels for these fields work and reuse existing messages.
 323                 $conversion = array(
 324                         'originalwidth' => 'imagewidth',
 325                         'originalheight' => 'imagelength',
 326                         'description' => 'imagedescription',
 327                         'title' => 'objectname',
 328                 );
 329                 foreach ( $metadata as $name => $value ) {
 330                         $tag = strtolower( $name );
 331                         if ( isset( $conversion[$tag] ) ) {
 332                                 $tag = $conversion[$tag];
 333                         } else {
 334                                 // Do not output other metadata not in list
 335                                 continue;
 336                         }
 337                         self::addMeta( $result,
 338                                 in_array( $tag, $visibleFields ) ? 'visible' : 'collapsed',
 339                                 'exif',
 340                                 $tag,
 341                                 $value
 342                         );
 343                 }
 344                 return $result;
 345         }
 346 }