includes/media/Bitmap.php

   1 <?php
   2 /**
   3  * Generic handler for bitmap 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  * Generic handler for bitmap images
  26  *
  27  * @ingroup Media
  28  */
  29 class BitmapHandler extends TransformationalImageHandler {
  30
  31         /**
  32          * Returns which scaler type should be used. Creates parent directories
  33          * for $dstPath and returns 'client' on error
  34          *
  35          * @param string $dstPath
  36          * @param bool $checkDstPath
  37          * @return string|Callable One of client, im, custom, gd, imext or an array( object, method )
  38          */
  39         protected function getScalerType( $dstPath, $checkDstPath = true ) {
  40                 global $wgUseImageResize, $wgUseImageMagick, $wgCustomConvertCommand;
  41
  42                 if ( !$dstPath && $checkDstPath ) {
  43                         # No output path available, client side scaling only
  44                         $scaler = 'client';
  45                 } elseif ( !$wgUseImageResize ) {
  46                         $scaler = 'client';
  47                 } elseif ( $wgUseImageMagick ) {
  48                         $scaler = 'im';
  49                 } elseif ( $wgCustomConvertCommand ) {
  50                         $scaler = 'custom';
  51                 } elseif ( function_exists( 'imagecreatetruecolor' ) ) {
  52                         $scaler = 'gd';
  53                 } elseif ( class_exists( 'Imagick' ) ) {
  54                         $scaler = 'imext';
  55                 } else {
  56                         $scaler = 'client';
  57                 }
  58
  59                 return $scaler;
  60         }
  61
  62         function makeParamString( $params ) {
  63                 $res = parent::makeParamString( $params );
  64                 if ( isset( $params['interlace'] ) && $params['interlace'] ) {
  65                         return "interlaced-{$res}";
  66                 } else {
  67                         return $res;
  68                 }
  69         }
  70
  71         function parseParamString( $str ) {
  72                 $remainder = preg_replace( '/^interlaced-/', '', $str );
  73                 $params = parent::parseParamString( $remainder );
  74                 if ( $params === false ) {
  75                         return false;
  76                 }
  77                 $params['interlace'] = $str !== $remainder;
  78                 return $params;
  79         }
  80
  81         /**
  82          * @param File $image
  83          * @param array $params
  84          * @return bool
  85          */
  86         function normaliseParams( $image, &$params ) {
  87                 global $wgMaxInterlacingAreas;
  88                 if ( !parent::normaliseParams( $image, $params ) ) {
  89                         return false;
  90                 }
  91                 $mimeType = $image->getMimeType();
  92                 $interlace = isset( $params['interlace'] ) && $params['interlace']
  93                         && isset( $wgMaxInterlacingAreas[$mimeType] )
  94                         && $this->getImageArea( $image ) <= $wgMaxInterlacingAreas[$mimeType];
  95                 $params['interlace'] = $interlace;
  96                 return true;
  97         }
  98
  99         /**
 100          * Transform an image using ImageMagick
 101          *
 102          * @param File $image File associated with this thumbnail
 103          * @param array $params Array with scaler params
 104          *
 105          * @return MediaTransformError Error object if error occurred, false (=no error) otherwise
 106          */
 107         protected function transformImageMagick( $image, $params ) {
 108                 # use ImageMagick
 109                 global $wgSharpenReductionThreshold, $wgSharpenParameter, $wgMaxAnimatedGifArea,
 110                         $wgImageMagickTempDir, $wgImageMagickConvertCommand, $wgMaxInterlacingAreas;
 111
 112                 $quality = array();
 113                 $sharpen = array();
 114                 $scene = false;
 115                 $animation_pre = array();
 116                 $animation_post = array();
 117                 $decoderHint = array();
 118
 119                 if ( $params['mimeType'] == 'image/jpeg' ) {
 120                         $qualityVal = isset( $params['quality'] ) ? (string)$params['quality'] : null;
 121                         $quality = array( '-quality', $qualityVal ?: '80' ); // 80%
 122                         if ( $params['interlace'] ) {
 123                                 $animation_post = array( '-interlace', 'JPEG' );
 124                         }
 125                         # Sharpening, see bug 6193
 126                         if ( ( $params['physicalWidth'] + $params['physicalHeight'] )
 127                                 / ( $params['srcWidth'] + $params['srcHeight'] )
 128                                 < $wgSharpenReductionThreshold
 129                         ) {
 130                                 $sharpen = array( '-sharpen', $wgSharpenParameter );
 131                         }
 132                         if ( version_compare( $this->getMagickVersion(), "6.5.6" ) >= 0 ) {
 133                                 // JPEG decoder hint to reduce memory, available since IM 6.5.6-2
 134                                 $decoderHint = array( '-define', "jpeg:size={$params['physicalDimensions']}" );
 135                         }
 136                 } elseif ( $params['mimeType'] == 'image/png' ) {
 137                         $quality = array( '-quality', '95' ); // zlib 9, adaptive filtering
 138                         if ( $params['interlace'] ) {
 139                                 $animation_post = array( '-interlace', 'PNG' );
 140                         }
 141                 } elseif ( $params['mimeType'] == 'image/webp' ) {
 142                         $quality = array( '-quality', '95' ); // zlib 9, adaptive filtering
 143                 } elseif ( $params['mimeType'] == 'image/gif' ) {
 144                         if ( $this->getImageArea( $image ) > $wgMaxAnimatedGifArea ) {
 145                                 // Extract initial frame only; we're so big it'll
 146                                 // be a total drag. :P
 147                                 $scene = 0;
 148                         } elseif ( $this->isAnimatedImage( $image ) ) {
 149                                 // Coalesce is needed to scale animated GIFs properly (bug 1017).
 150                                 $animation_pre = array( '-coalesce' );
 151                                 // We optimize the output, but -optimize is broken,
 152                                 // use optimizeTransparency instead (bug 11822)
 153                                 if ( version_compare( $this->getMagickVersion(), "6.3.5" ) >= 0 ) {
 154                                         $animation_post = array( '-fuzz', '5%', '-layers', 'optimizeTransparency' );
 155                                 }
 156                         }
 157                         if ( $params['interlace'] && version_compare( $this->getMagickVersion(), "6.3.4" ) >= 0
 158                                 && !$this->isAnimatedImage( $image ) ) { // interlacing animated GIFs is a bad idea
 159                                 $animation_post[] = '-interlace';
 160                                 $animation_post[] = 'GIF';
 161                         }
 162                 } elseif ( $params['mimeType'] == 'image/x-xcf' ) {
 163                         // Before merging layers, we need to set the background
 164                         // to be transparent to preserve alpha, as -layers merge
 165                         // merges all layers on to a canvas filled with the
 166                         // background colour. After merging we reset the background
 167                         // to be white for the default background colour setting
 168                         // in the PNG image (which is used in old IE)
 169                         $animation_pre = array(
 170                                 '-background', 'transparent',
 171                                 '-layers', 'merge',
 172                                 '-background', 'white',
 173                         );
 174                         MediaWiki\suppressWarnings();
 175                         $xcfMeta = unserialize( $image->getMetadata() );
 176                         MediaWiki\restoreWarnings();
 177                         if ( $xcfMeta
 178                                 && isset( $xcfMeta['colorType'] )
 179                                 && $xcfMeta['colorType'] === 'greyscale-alpha'
 180                                 && version_compare( $this->getMagickVersion(), "6.8.9-3" ) < 0
 181                         ) {
 182                                 // bug 66323 - Greyscale images not rendered properly.
 183                                 // So only take the "red" channel.
 184                                 $channelOnly = array( '-channel', 'R', '-separate' );
 185                                 $animation_pre = array_merge( $animation_pre, $channelOnly );
 186                         }
 187                 }
 188
 189                 // Use one thread only, to avoid deadlock bugs on OOM
 190                 $env = array( 'OMP_NUM_THREADS' => 1 );
 191                 if ( strval( $wgImageMagickTempDir ) !== '' ) {
 192                         $env['MAGICK_TMPDIR'] = $wgImageMagickTempDir;
 193                 }
 194
 195                 $rotation = isset( $params['disableRotation'] ) ? 0 : $this->getRotation( $image );
 196                 list( $width, $height ) = $this->extractPreRotationDimensions( $params, $rotation );
 197
 198                 $cmd = call_user_func_array( 'wfEscapeShellArg', array_merge(
 199                         array( $wgImageMagickConvertCommand ),
 200                         $quality,
 201                         // Specify white background color, will be used for transparent images
 202                         // in Internet Explorer/Windows instead of default black.
 203                         array( '-background', 'white' ),
 204                         $decoderHint,
 205                         array( $this->escapeMagickInput( $params['srcPath'], $scene ) ),
 206                         $animation_pre,
 207                         // For the -thumbnail option a "!" is needed to force exact size,
 208                         // or ImageMagick may decide your ratio is wrong and slice off
 209                         // a pixel.
 210                         array( '-thumbnail', "{$width}x{$height}!" ),
 211                         // Add the source url as a comment to the thumb, but don't add the flag if there's no comment
 212                         ( $params['comment'] !== ''
 213                                 ? array( '-set', 'comment', $this->escapeMagickProperty( $params['comment'] ) )
 214                                 : array() ),
 215                         // T108616: Avoid exposure of local file path
 216                         array( '+set', 'Thumb::URI' ),
 217                         array( '-depth', 8 ),
 218                         $sharpen,
 219                         array( '-rotate', "-$rotation" ),
 220                         $animation_post,
 221                         array( $this->escapeMagickOutput( $params['dstPath'] ) ) ) );
 222
 223                 wfDebug( __METHOD__ . ": running ImageMagick: $cmd\n" );
 224                 $retval = 0;
 225                 $err = wfShellExecWithStderr( $cmd, $retval, $env );
 226
 227                 if ( $retval !== 0 ) {
 228                         $this->logErrorForExternalProcess( $retval, $err, $cmd );
 229
 230                         return $this->getMediaTransformError( $params, "$err\nError code: $retval" );
 231                 }
 232
 233                 return false; # No error
 234         }
 235
 236         /**
 237          * Transform an image using the Imagick PHP extension
 238          *
 239          * @param File $image File associated with this thumbnail
 240          * @param array $params Array with scaler params
 241          *
 242          * @return MediaTransformError Error object if error occurred, false (=no error) otherwise
 243          */
 244         protected function transformImageMagickExt( $image, $params ) {
 245                 global $wgSharpenReductionThreshold, $wgSharpenParameter, $wgMaxAnimatedGifArea,
 246                         $wgMaxInterlacingAreas;
 247
 248                 try {
 249                         $im = new Imagick();
 250                         $im->readImage( $params['srcPath'] );
 251
 252                         if ( $params['mimeType'] == 'image/jpeg' ) {
 253                                 // Sharpening, see bug 6193
 254                                 if ( ( $params['physicalWidth'] + $params['physicalHeight'] )
 255                                         / ( $params['srcWidth'] + $params['srcHeight'] )
 256                                         < $wgSharpenReductionThreshold
 257                                 ) {
 258                                         // Hack, since $wgSharpenParameter is written specifically for the command line convert
 259                                         list( $radius, $sigma ) = explode( 'x', $wgSharpenParameter );
 260                                         $im->sharpenImage( $radius, $sigma );
 261                                 }
 262                                 $qualityVal = isset( $params['quality'] ) ? (string)$params['quality'] : null;
 263                                 $im->setCompressionQuality( $qualityVal ?: 80 );
 264                                 if ( $params['interlace'] ) {
 265                                         $im->setInterlaceScheme( Imagick::INTERLACE_JPEG );
 266                                 }
 267                         } elseif ( $params['mimeType'] == 'image/png' ) {
 268                                 $im->setCompressionQuality( 95 );
 269                                 if ( $params['interlace'] ) {
 270                                         $im->setInterlaceScheme( Imagick::INTERLACE_PNG );
 271                                 }
 272                         } elseif ( $params['mimeType'] == 'image/gif' ) {
 273                                 if ( $this->getImageArea( $image ) > $wgMaxAnimatedGifArea ) {
 274                                         // Extract initial frame only; we're so big it'll
 275                                         // be a total drag. :P
 276                                         $im->setImageScene( 0 );
 277                                 } elseif ( $this->isAnimatedImage( $image ) ) {
 278                                         // Coalesce is needed to scale animated GIFs properly (bug 1017).
 279                                         $im = $im->coalesceImages();
 280                                 }
 281                                 // GIF interlacing is only available since 6.3.4
 282                                 $v = Imagick::getVersion();
 283                                 preg_match( '/ImageMagick ([0-9]+\.[0-9]+\.[0-9]+)/', $v['versionString'], $v );
 284
 285                                 if ( $params['interlace'] && version_compare( $v[1], '6.3.4' ) >= 0 ) {
 286                                         $im->setInterlaceScheme( Imagick::INTERLACE_GIF );
 287                                 }
 288                         }
 289
 290                         $rotation = isset( $params['disableRotation'] ) ? 0 : $this->getRotation( $image );
 291                         list( $width, $height ) = $this->extractPreRotationDimensions( $params, $rotation );
 292
 293                         $im->setImageBackgroundColor( new ImagickPixel( 'white' ) );
 294
 295                         // Call Imagick::thumbnailImage on each frame
 296                         foreach ( $im as $i => $frame ) {
 297                                 if ( !$frame->thumbnailImage( $width, $height, /* fit */ false ) ) {
 298                                         return $this->getMediaTransformError( $params, "Error scaling frame $i" );
 299                                 }
 300                         }
 301                         $im->setImageDepth( 8 );
 302
 303                         if ( $rotation ) {
 304                                 if ( !$im->rotateImage( new ImagickPixel( 'white' ), 360 - $rotation ) ) {
 305                                         return $this->getMediaTransformError( $params, "Error rotating $rotation degrees" );
 306                                 }
 307                         }
 308
 309                         if ( $this->isAnimatedImage( $image ) ) {
 310                                 wfDebug( __METHOD__ . ": Writing animated thumbnail\n" );
 311                                 // This is broken somehow... can't find out how to fix it
 312                                 $result = $im->writeImages( $params['dstPath'], true );
 313                         } else {
 314                                 $result = $im->writeImage( $params['dstPath'] );
 315                         }
 316                         if ( !$result ) {
 317                                 return $this->getMediaTransformError( $params,
 318                                         "Unable to write thumbnail to {$params['dstPath']}" );
 319                         }
 320                 } catch ( ImagickException $e ) {
 321                         return $this->getMediaTransformError( $params, $e->getMessage() );
 322                 }
 323
 324                 return false;
 325         }
 326
 327         /**
 328          * Transform an image using a custom command
 329          *
 330          * @param File $image File associated with this thumbnail
 331          * @param array $params Array with scaler params
 332          *
 333          * @return MediaTransformError Error object if error occurred, false (=no error) otherwise
 334          */
 335         protected function transformCustom( $image, $params ) {
 336                 # Use a custom convert command
 337                 global $wgCustomConvertCommand;
 338
 339                 # Variables: %s %d %w %h
 340                 $src = wfEscapeShellArg( $params['srcPath'] );
 341                 $dst = wfEscapeShellArg( $params['dstPath'] );
 342                 $cmd = $wgCustomConvertCommand;
 343                 $cmd = str_replace( '%s', $src, str_replace( '%d', $dst, $cmd ) ); # Filenames
 344                 $cmd = str_replace( '%h', wfEscapeShellArg( $params['physicalHeight'] ),
 345                         str_replace( '%w', wfEscapeShellArg( $params['physicalWidth'] ), $cmd ) ); # Size
 346                 wfDebug( __METHOD__ . ": Running custom convert command $cmd\n" );
 347                 $retval = 0;
 348                 $err = wfShellExecWithStderr( $cmd, $retval );
 349
 350                 if ( $retval !== 0 ) {
 351                         $this->logErrorForExternalProcess( $retval, $err, $cmd );
 352
 353                         return $this->getMediaTransformError( $params, $err );
 354                 }
 355
 356                 return false; # No error
 357         }
 358
 359         /**
 360          * Transform an image using the built in GD library
 361          *
 362          * @param File $image File associated with this thumbnail
 363          * @param array $params Array with scaler params
 364          *
 365          * @return MediaTransformError Error object if error occurred, false (=no error) otherwise
 366          */
 367         protected function transformGd( $image, $params ) {
 368                 # Use PHP's builtin GD library functions.
 369                 # First find out what kind of file this is, and select the correct
 370                 # input routine for this.
 371
 372                 $typemap = array(
 373                         'image/gif' => array( 'imagecreatefromgif', 'palette', false, 'imagegif' ),
 374                         'image/jpeg' => array( 'imagecreatefromjpeg', 'truecolor', true,
 375                                 array( __CLASS__, 'imageJpegWrapper' ) ),
 376                         'image/png' => array( 'imagecreatefrompng', 'bits', false, 'imagepng' ),
 377                         'image/vnd.wap.wbmp' => array( 'imagecreatefromwbmp', 'palette', false, 'imagewbmp' ),
 378                         'image/xbm' => array( 'imagecreatefromxbm', 'palette', false, 'imagexbm' ),
 379                 );
 380
 381                 if ( !isset( $typemap[$params['mimeType']] ) ) {
 382                         $err = 'Image type not supported';
 383                         wfDebug( "$err\n" );
 384                         $errMsg = wfMessage( 'thumbnail_image-type' )->text();
 385
 386                         return $this->getMediaTransformError( $params, $errMsg );
 387                 }
 388                 list( $loader, $colorStyle, $useQuality, $saveType ) = $typemap[$params['mimeType']];
 389
 390                 if ( !function_exists( $loader ) ) {
 391                         $err = "Incomplete GD library configuration: missing function $loader";
 392                         wfDebug( "$err\n" );
 393                         $errMsg = wfMessage( 'thumbnail_gd-library', $loader )->text();
 394
 395                         return $this->getMediaTransformError( $params, $errMsg );
 396                 }
 397
 398                 if ( !file_exists( $params['srcPath'] ) ) {
 399                         $err = "File seems to be missing: {$params['srcPath']}";
 400                         wfDebug( "$err\n" );
 401                         $errMsg = wfMessage( 'thumbnail_image-missing', $params['srcPath'] )->text();
 402
 403                         return $this->getMediaTransformError( $params, $errMsg );
 404                 }
 405
 406                 $src_image = call_user_func( $loader, $params['srcPath'] );
 407
 408                 $rotation = function_exists( 'imagerotate' ) && !isset( $params['disableRotation'] ) ?
 409                         $this->getRotation( $image ) :
 410                         0;
 411                 list( $width, $height ) = $this->extractPreRotationDimensions( $params, $rotation );
 412                 $dst_image = imagecreatetruecolor( $width, $height );
 413
 414                 // Initialise the destination image to transparent instead of
 415                 // the default solid black, to support PNG and GIF transparency nicely
 416                 $background = imagecolorallocate( $dst_image, 0, 0, 0 );
 417                 imagecolortransparent( $dst_image, $background );
 418                 imagealphablending( $dst_image, false );
 419
 420                 if ( $colorStyle == 'palette' ) {
 421                         // Don't resample for paletted GIF images.
 422                         // It may just uglify them, and completely breaks transparency.
 423                         imagecopyresized( $dst_image, $src_image,
 424                                 0, 0, 0, 0,
 425                                 $width, $height,
 426                                 imagesx( $src_image ), imagesy( $src_image ) );
 427                 } else {
 428                         imagecopyresampled( $dst_image, $src_image,
 429                                 0, 0, 0, 0,
 430                                 $width, $height,
 431                                 imagesx( $src_image ), imagesy( $src_image ) );
 432                 }
 433
 434                 if ( $rotation % 360 != 0 && $rotation % 90 == 0 ) {
 435                         $rot_image = imagerotate( $dst_image, $rotation, 0 );
 436                         imagedestroy( $dst_image );
 437                         $dst_image = $rot_image;
 438                 }
 439
 440                 imagesavealpha( $dst_image, true );
 441
 442                 $funcParams = array( $dst_image, $params['dstPath'] );
 443                 if ( $useQuality && isset( $params['quality'] ) ) {
 444                         $funcParams[] = $params['quality'];
 445                 }
 446                 call_user_func_array( $saveType, $funcParams );
 447
 448                 imagedestroy( $dst_image );
 449                 imagedestroy( $src_image );
 450
 451                 return false; # No error
 452         }
 453
 454         /**
 455          * Callback for transformGd when transforming jpeg images.
 456          */
 457         // FIXME: transformImageMagick() & transformImageMagickExt() uses JPEG quality 80, here it's 95?
 458         static function imageJpegWrapper( $dst_image, $thumbPath, $quality = 95 ) {
 459                 imageinterlace( $dst_image );
 460                 imagejpeg( $dst_image, $thumbPath, $quality );
 461         }
 462
 463         /**
 464          * Returns whether the current scaler supports rotation (im and gd do)
 465          *
 466          * @return bool
 467          */
 468         public function canRotate() {
 469                 $scaler = $this->getScalerType( null, false );
 470                 switch ( $scaler ) {
 471                         case 'im':
 472                                 # ImageMagick supports autorotation
 473                                 return true;
 474                         case 'imext':
 475                                 # Imagick::rotateImage
 476                                 return true;
 477                         case 'gd':
 478                                 # GD's imagerotate function is used to rotate images, but not
 479                                 # all precompiled PHP versions have that function
 480                                 return function_exists( 'imagerotate' );
 481                         default:
 482                                 # Other scalers don't support rotation
 483                                 return false;
 484                 }
 485         }
 486
 487         /**
 488          * @see $wgEnableAutoRotation
 489          * @return bool Whether auto rotation is enabled
 490          */
 491         public function autoRotateEnabled() {
 492                 global $wgEnableAutoRotation;
 493
 494                 if ( $wgEnableAutoRotation === null ) {
 495                         // Only enable auto-rotation when we actually can
 496                         return $this->canRotate();
 497                 }
 498
 499                 return $wgEnableAutoRotation;
 500         }
 501
 502         /**
 503          * @param File $file
 504          * @param array $params Rotate parameters.
 505          *   'rotation' clockwise rotation in degrees, allowed are multiples of 90
 506          * @since 1.21
 507          * @return bool
 508          */
 509         public function rotate( $file, $params ) {
 510                 global $wgImageMagickConvertCommand;
 511
 512                 $rotation = ( $params['rotation'] + $this->getRotation( $file ) ) % 360;
 513                 $scene = false;
 514
 515                 $scaler = $this->getScalerType( null, false );
 516                 switch ( $scaler ) {
 517                         case 'im':
 518                                 $cmd = wfEscapeShellArg( $wgImageMagickConvertCommand ) . " " .
 519                                         wfEscapeShellArg( $this->escapeMagickInput( $params['srcPath'], $scene ) ) .
 520                                         " -rotate " . wfEscapeShellArg( "-$rotation" ) . " " .
 521                                         wfEscapeShellArg( $this->escapeMagickOutput( $params['dstPath'] ) );
 522                                 wfDebug( __METHOD__ . ": running ImageMagick: $cmd\n" );
 523                                 $retval = 0;
 524                                 $err = wfShellExecWithStderr( $cmd, $retval );
 525                                 if ( $retval !== 0 ) {
 526                                         $this->logErrorForExternalProcess( $retval, $err, $cmd );
 527
 528                                         return new MediaTransformError( 'thumbnail_error', 0, 0, $err );
 529                                 }
 530
 531                                 return false;
 532                         case 'imext':
 533                                 $im = new Imagick();
 534                                 $im->readImage( $params['srcPath'] );
 535                                 if ( !$im->rotateImage( new ImagickPixel( 'white' ), 360 - $rotation ) ) {
 536                                         return new MediaTransformError( 'thumbnail_error', 0, 0,
 537                                                 "Error rotating $rotation degrees" );
 538                                 }
 539                                 $result = $im->writeImage( $params['dstPath'] );
 540                                 if ( !$result ) {
 541                                         return new MediaTransformError( 'thumbnail_error', 0, 0,
 542                                                 "Unable to write image to {$params['dstPath']}" );
 543                                 }
 544
 545                                 return false;
 546                         default:
 547                                 return new MediaTransformError( 'thumbnail_error', 0, 0,
 548                                         "$scaler rotation not implemented" );
 549                 }
 550         }
 551 }