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 ImageHandler {
  30         /**
  31          * @param File $image
  32          * @param array $params Transform parameters. Entries with the keys 'width'
  33          * and 'height' are the respective screen width and height, while the keys
  34          * 'physicalWidth' and 'physicalHeight' indicate the thumbnail dimensions.
  35          * @return bool
  36          */
  37         function normaliseParams( $image, &$params ) {
  38                 if ( !parent::normaliseParams( $image, $params ) ) {
  39                         return false;
  40                 }
  41
  42                 # Obtain the source, pre-rotation dimensions
  43                 $srcWidth = $image->getWidth( $params['page'] );
  44                 $srcHeight = $image->getHeight( $params['page'] );
  45
  46                 # Don't make an image bigger than the source
  47                 if ( $params['physicalWidth'] >= $srcWidth ) {
  48                         $params['physicalWidth'] = $srcWidth;
  49                         $params['physicalHeight'] = $srcHeight;
  50
  51                         # Skip scaling limit checks if no scaling is required
  52                         # due to requested size being bigger than source.
  53                         if ( !$image->mustRender() ) {
  54                                 return true;
  55                         }
  56                 }
  57
  58                 # Check if the file is smaller than the maximum image area for thumbnailing
  59                 $checkImageAreaHookResult = null;
  60                 wfRunHooks(
  61                         'BitmapHandlerCheckImageArea',
  62                         array( $image, &$params, &$checkImageAreaHookResult )
  63                 );
  64
  65                 if ( is_null( $checkImageAreaHookResult ) ) {
  66                         global $wgMaxImageArea;
  67
  68                         if ( $srcWidth * $srcHeight > $wgMaxImageArea
  69                                 && !( $image->getMimeType() == 'image/jpeg'
  70                                         && self::getScalerType( false, false ) == 'im' )
  71                         ) {
  72                                 # Only ImageMagick can efficiently downsize jpg images without loading
  73                                 # the entire file in memory
  74                                 return false;
  75                         }
  76                 } else {
  77                         return $checkImageAreaHookResult;
  78                 }
  79
  80                 return true;
  81         }
  82
  83         /**
  84          * Extracts the width/height if the image will be scaled before rotating
  85          *
  86          * This will match the physical size/aspect ratio of the original image
  87          * prior to application of the rotation -- so for a portrait image that's
  88          * stored as raw landscape with 90-degress rotation, the resulting size
  89          * will be wider than it is tall.
  90          *
  91          * @param array $params Parameters as returned by normaliseParams
  92          * @param int $rotation The rotation angle that will be applied
  93          * @return array ($width, $height) array
  94          */
  95         public function extractPreRotationDimensions( $params, $rotation ) {
  96                 if ( $rotation == 90 || $rotation == 270 ) {
  97                         # We'll resize before rotation, so swap the dimensions again
  98                         $width = $params['physicalHeight'];
  99                         $height = $params['physicalWidth'];
 100                 } else {
 101                         $width = $params['physicalWidth'];
 102                         $height = $params['physicalHeight'];
 103                 }
 104
 105                 return array( $width, $height );
 106         }
 107
 108         /**
 109          * @param File $image
 110          * @param string $dstPath
 111          * @param string $dstUrl
 112          * @param array $params
 113          * @param int $flags
 114          * @return MediaTransformError|ThumbnailImage|TransformParameterError
 115          */
 116         function doTransform( $image, $dstPath, $dstUrl, $params, $flags = 0 ) {
 117                 if ( !$this->normaliseParams( $image, $params ) ) {
 118                         return new TransformParameterError( $params );
 119                 }
 120                 # Create a parameter array to pass to the scaler
 121                 $scalerParams = array(
 122                         # The size to which the image will be resized
 123                         'physicalWidth' => $params['physicalWidth'],
 124                         'physicalHeight' => $params['physicalHeight'],
 125                         'physicalDimensions' => "{$params['physicalWidth']}x{$params['physicalHeight']}",
 126                         # The size of the image on the page
 127                         'clientWidth' => $params['width'],
 128                         'clientHeight' => $params['height'],
 129                         # Comment as will be added to the Exif of the thumbnail
 130                         'comment' => isset( $params['descriptionUrl'] )
 131                                 ? "File source: {$params['descriptionUrl']}"
 132                                 : '',
 133                         # Properties of the original image
 134                         'srcWidth' => $image->getWidth(),
 135                         'srcHeight' => $image->getHeight(),
 136                         'mimeType' => $image->getMimeType(),
 137                         'dstPath' => $dstPath,
 138                         'dstUrl' => $dstUrl,
 139                 );
 140
 141                 if ( isset( $params['quality'] ) && $params['quality'] === 'low' ) {
 142                         $scalerParams['quality'] = 30;
 143                 }
 144
 145                 # Determine scaler type
 146                 $scaler = self::getScalerType( $dstPath );
 147
 148                 wfDebug( __METHOD__ . ": creating {$scalerParams['physicalDimensions']} " .
 149                         "thumbnail at $dstPath using scaler $scaler\n" );
 150
 151                 if ( !$image->mustRender() &&
 152                         $scalerParams['physicalWidth'] == $scalerParams['srcWidth']
 153                         && $scalerParams['physicalHeight'] == $scalerParams['srcHeight']
 154                         && !isset( $scalerParams['quality'] )
 155                 ) {
 156
 157                         # normaliseParams (or the user) wants us to return the unscaled image
 158                         wfDebug( __METHOD__ . ": returning unscaled image\n" );
 159
 160                         return $this->getClientScalingThumbnailImage( $image, $scalerParams );
 161                 }
 162
 163                 if ( $scaler == 'client' ) {
 164                         # Client-side image scaling, use the source URL
 165                         # Using the destination URL in a TRANSFORM_LATER request would be incorrect
 166                         return $this->getClientScalingThumbnailImage( $image, $scalerParams );
 167                 }
 168
 169                 if ( $flags & self::TRANSFORM_LATER ) {
 170                         wfDebug( __METHOD__ . ": Transforming later per flags.\n" );
 171                         $newParams = array(
 172                                 'width' => $scalerParams['clientWidth'],
 173                                 'height' => $scalerParams['clientHeight']
 174                         );
 175                         if ( isset( $params['quality'] ) ) {
 176                                 $newParams['quality'] = $params['quality'];
 177                         }
 178                         return new ThumbnailImage( $image, $dstUrl, false, $newParams );
 179                 }
 180
 181                 # Try to make a target path for the thumbnail
 182                 if ( !wfMkdirParents( dirname( $dstPath ), null, __METHOD__ ) ) {
 183                         wfDebug( __METHOD__ . ": Unable to create thumbnail destination " .
 184                                 "directory, falling back to client scaling\n" );
 185
 186                         return $this->getClientScalingThumbnailImage( $image, $scalerParams );
 187                 }
 188
 189                 # Transform functions and binaries need a FS source file
 190                 $scalerParams['srcPath'] = $image->getLocalRefPath();
 191                 if ( $scalerParams['srcPath'] === false ) { // Failed to get local copy
 192                         wfDebugLog( 'thumbnail',
 193                                 sprintf( 'Thumbnail failed on %s: could not get local copy of "%s"',
 194                                         wfHostname(), $image->getName() ) );
 195
 196                         return new MediaTransformError( 'thumbnail_error',
 197                                 $scalerParams['clientWidth'], $scalerParams['clientHeight'],
 198                                 wfMessage( 'filemissing' )->text()
 199                         );
 200                 }
 201
 202                 # Try a hook
 203                 $mto = null;
 204                 wfRunHooks( 'BitmapHandlerTransform', array( $this, $image, &$scalerParams, &$mto ) );
 205                 if ( !is_null( $mto ) ) {
 206                         wfDebug( __METHOD__ . ": Hook to BitmapHandlerTransform created an mto\n" );
 207                         $scaler = 'hookaborted';
 208                 }
 209
 210                 switch ( $scaler ) {
 211                         case 'hookaborted':
 212                                 # Handled by the hook above
 213                                 /** @var MediaTransformOutput $mto */
 214                                 $err = $mto->isError() ? $mto : false;
 215                                 break;
 216                         case 'im':
 217                                 $err = $this->transformImageMagick( $image, $scalerParams );
 218                                 break;
 219                         case 'custom':
 220                                 $err = $this->transformCustom( $image, $scalerParams );
 221                                 break;
 222                         case 'imext':
 223                                 $err = $this->transformImageMagickExt( $image, $scalerParams );
 224                                 break;
 225                         case 'gd':
 226                         default:
 227                                 $err = $this->transformGd( $image, $scalerParams );
 228                                 break;
 229                 }
 230
 231                 # Remove the file if a zero-byte thumbnail was created, or if there was an error
 232                 $removed = $this->removeBadFile( $dstPath, (bool)$err );
 233                 if ( $err ) {
 234                         # transform returned MediaTransforError
 235                         return $err;
 236                 } elseif ( $removed ) {
 237                         # Thumbnail was zero-byte and had to be removed
 238                         return new MediaTransformError( 'thumbnail_error',
 239                                 $scalerParams['clientWidth'], $scalerParams['clientHeight'],
 240                                 wfMessage( 'unknown-error' )->text()
 241                         );
 242                 } elseif ( $mto ) {
 243                         return $mto;
 244                 } else {
 245                         $newParams = array(
 246                                 'width' => $scalerParams['clientWidth'],
 247                                 'height' => $scalerParams['clientHeight']
 248                         );
 249                         if ( isset( $params['quality'] ) ) {
 250                                 $newParams['quality'] = $params['quality'];
 251                         }
 252                         return new ThumbnailImage( $image, $dstUrl, $dstPath, $newParams );
 253                 }
 254         }
 255
 256         /**
 257          * Returns which scaler type should be used. Creates parent directories
 258          * for $dstPath and returns 'client' on error
 259          *
 260          * @param string $dstPath
 261          * @param bool $checkDstPath
 262          * @return string One of client, im, custom, gd, imext
 263          */
 264         protected static function getScalerType( $dstPath, $checkDstPath = true ) {
 265                 global $wgUseImageResize, $wgUseImageMagick, $wgCustomConvertCommand;
 266
 267                 if ( !$dstPath && $checkDstPath ) {
 268                         # No output path available, client side scaling only
 269                         $scaler = 'client';
 270                 } elseif ( !$wgUseImageResize ) {
 271                         $scaler = 'client';
 272                 } elseif ( $wgUseImageMagick ) {
 273                         $scaler = 'im';
 274                 } elseif ( $wgCustomConvertCommand ) {
 275                         $scaler = 'custom';
 276                 } elseif ( function_exists( 'imagecreatetruecolor' ) ) {
 277                         $scaler = 'gd';
 278                 } elseif ( class_exists( 'Imagick' ) ) {
 279                         $scaler = 'imext';
 280                 } else {
 281                         $scaler = 'client';
 282                 }
 283
 284                 return $scaler;
 285         }
 286
 287         /**
 288          * Get a ThumbnailImage that respresents an image that will be scaled
 289          * client side
 290          *
 291          * @param File $image File associated with this thumbnail
 292          * @param array $scalerParams Array with scaler params
 293          * @return ThumbnailImage
 294          *
 295          * @todo FIXME: No rotation support
 296          */
 297         protected function getClientScalingThumbnailImage( $image, $scalerParams ) {
 298                 $params = array(
 299                         'width' => $scalerParams['clientWidth'],
 300                         'height' => $scalerParams['clientHeight']
 301                 );
 302
 303                 return new ThumbnailImage( $image, $image->getURL(), null, $params );
 304         }
 305
 306         /**
 307          * Transform an image using ImageMagick
 308          *
 309          * @param File $image File associated with this thumbnail
 310          * @param array $params Array with scaler params
 311          *
 312          * @return MediaTransformError Error object if error occurred, false (=no error) otherwise
 313          */
 314         protected function transformImageMagick( $image, $params ) {
 315                 # use ImageMagick
 316                 global $wgSharpenReductionThreshold, $wgSharpenParameter, $wgMaxAnimatedGifArea,
 317                         $wgImageMagickTempDir, $wgImageMagickConvertCommand;
 318
 319                 $quality = array();
 320                 $sharpen = array();
 321                 $scene = false;
 322                 $animation_pre = array();
 323                 $animation_post = array();
 324                 $decoderHint = array();
 325                 if ( $params['mimeType'] == 'image/jpeg' ) {
 326                         $qualityVal = isset( $params['quality'] ) ? (string) $params['quality'] : null;
 327                         $quality = array( '-quality', $qualityVal ?: '80' ); // 80%
 328                         # Sharpening, see bug 6193
 329                         if ( ( $params['physicalWidth'] + $params['physicalHeight'] )
 330                                 / ( $params['srcWidth'] + $params['srcHeight'] )
 331                                 < $wgSharpenReductionThreshold
 332                         ) {
 333                                 $sharpen = array( '-sharpen', $wgSharpenParameter );
 334                         }
 335                         if ( version_compare( $this->getMagickVersion(), "6.5.6" ) >= 0 ) {
 336                                 // JPEG decoder hint to reduce memory, available since IM 6.5.6-2
 337                                 $decoderHint = array( '-define', "jpeg:size={$params['physicalDimensions']}" );
 338                         }
 339                 } elseif ( $params['mimeType'] == 'image/png' ) {
 340                         $quality = array( '-quality', '95' ); // zlib 9, adaptive filtering
 341
 342                 } elseif ( $params['mimeType'] == 'image/gif' ) {
 343                         if ( $this->getImageArea( $image ) > $wgMaxAnimatedGifArea ) {
 344                                 // Extract initial frame only; we're so big it'll
 345                                 // be a total drag. :P
 346                                 $scene = 0;
 347                         } elseif ( $this->isAnimatedImage( $image ) ) {
 348                                 // Coalesce is needed to scale animated GIFs properly (bug 1017).
 349                                 $animation_pre = array( '-coalesce' );
 350                                 // We optimize the output, but -optimize is broken,
 351                                 // use optimizeTransparency instead (bug 11822)
 352                                 if ( version_compare( $this->getMagickVersion(), "6.3.5" ) >= 0 ) {
 353                                         $animation_post = array( '-fuzz', '5%', '-layers', 'optimizeTransparency' );
 354                                 }
 355                         }
 356                 } elseif ( $params['mimeType'] == 'image/x-xcf' ) {
 357                         // Before merging layers, we need to set the background
 358                         // to be transparent to preserve alpha, as -layers merge
 359                         // merges all layers on to a canvas filled with the
 360                         // background colour. After merging we reset the background
 361                         // to be white for the default background colour setting
 362                         // in the PNG image (which is used in old IE)
 363                         $animation_post = array(
 364                                 '-background', 'transparent',
 365                                 '-layers', 'merge',
 366                                 '-background', 'white',
 367                         );
 368                         wfSuppressWarnings();
 369                         $xcfMeta = unserialize( $image->getMetadata() );
 370                         wfRestoreWarnings();
 371                         if ( $xcfMeta
 372                                 && isset( $xcfMeta['colorType'] )
 373                                 && $xcfMeta['colorType'] === 'greyscale-alpha'
 374                                 && version_compare( $this->getMagickVersion(), "6.8.9-3" ) < 0
 375                         ) {
 376                                 // bug 66323 - Greyscale images not rendered properly.
 377                                 // So only take the "red" channel.
 378                                 $channelOnly = array( '-channel', 'R', '-separate' );
 379                                 $animation_post = array_merge( $animation_post, $channelOnly );
 380                         }
 381                 }
 382
 383                 // Use one thread only, to avoid deadlock bugs on OOM
 384                 $env = array( 'OMP_NUM_THREADS' => 1 );
 385                 if ( strval( $wgImageMagickTempDir ) !== '' ) {
 386                         $env['MAGICK_TMPDIR'] = $wgImageMagickTempDir;
 387                 }
 388
 389                 $rotation = $this->getRotation( $image );
 390                 list( $width, $height ) = $this->extractPreRotationDimensions( $params, $rotation );
 391
 392                 $cmd = call_user_func_array( 'wfEscapeShellArg', array_merge(
 393                         array( $wgImageMagickConvertCommand ),
 394                         $quality,
 395                         // Specify white background color, will be used for transparent images
 396                         // in Internet Explorer/Windows instead of default black.
 397                         array( '-background', 'white' ),
 398                         $decoderHint,
 399                         array( $this->escapeMagickInput( $params['srcPath'], $scene ) ),
 400                         $animation_pre,
 401                         // For the -thumbnail option a "!" is needed to force exact size,
 402                         // or ImageMagick may decide your ratio is wrong and slice off
 403                         // a pixel.
 404                         array( '-thumbnail', "{$width}x{$height}!" ),
 405                         // Add the source url as a comment to the thumb, but don't add the flag if there's no comment
 406                         ( $params['comment'] !== ''
 407                                 ? array( '-set', 'comment', $this->escapeMagickProperty( $params['comment'] ) )
 408                                 : array() ),
 409                         array( '-depth', 8 ),
 410                         $sharpen,
 411                         array( '-rotate', "-$rotation" ),
 412                         $animation_post,
 413                         array( $this->escapeMagickOutput( $params['dstPath'] ) ) ) );
 414
 415                 wfDebug( __METHOD__ . ": running ImageMagick: $cmd\n" );
 416                 wfProfileIn( 'convert' );
 417                 $retval = 0;
 418                 $err = wfShellExecWithStderr( $cmd, $retval, $env );
 419                 wfProfileOut( 'convert' );
 420
 421                 if ( $retval !== 0 ) {
 422                         $this->logErrorForExternalProcess( $retval, $err, $cmd );
 423
 424                         return $this->getMediaTransformError( $params, "$err\nError code: $retval" );
 425                 }
 426
 427                 return false; # No error
 428         }
 429
 430         /**
 431          * Transform an image using the Imagick PHP extension
 432          *
 433          * @param File $image File associated with this thumbnail
 434          * @param array $params Array with scaler params
 435          *
 436          * @return MediaTransformError Error object if error occurred, false (=no error) otherwise
 437          */
 438         protected function transformImageMagickExt( $image, $params ) {
 439                 global $wgSharpenReductionThreshold, $wgSharpenParameter, $wgMaxAnimatedGifArea;
 440
 441                 try {
 442                         $im = new Imagick();
 443                         $im->readImage( $params['srcPath'] );
 444
 445                         if ( $params['mimeType'] == 'image/jpeg' ) {
 446                                 // Sharpening, see bug 6193
 447                                 if ( ( $params['physicalWidth'] + $params['physicalHeight'] )
 448                                         / ( $params['srcWidth'] + $params['srcHeight'] )
 449                                         < $wgSharpenReductionThreshold
 450                                 ) {
 451                                         // Hack, since $wgSharpenParamater is written specifically for the command line convert
 452                                         list( $radius, $sigma ) = explode( 'x', $wgSharpenParameter );
 453                                         $im->sharpenImage( $radius, $sigma );
 454                                 }
 455                                 $qualityVal = isset( $params['quality'] ) ? (string) $params['quality'] : null;
 456                                 $im->setCompressionQuality( $qualityVal ?: 80 );
 457                         } elseif ( $params['mimeType'] == 'image/png' ) {
 458                                 $im->setCompressionQuality( 95 );
 459                         } elseif ( $params['mimeType'] == 'image/gif' ) {
 460                                 if ( $this->getImageArea( $image ) > $wgMaxAnimatedGifArea ) {
 461                                         // Extract initial frame only; we're so big it'll
 462                                         // be a total drag. :P
 463                                         $im->setImageScene( 0 );
 464                                 } elseif ( $this->isAnimatedImage( $image ) ) {
 465                                         // Coalesce is needed to scale animated GIFs properly (bug 1017).
 466                                         $im = $im->coalesceImages();
 467                                 }
 468                         }
 469
 470                         $rotation = $this->getRotation( $image );
 471                         list( $width, $height ) = $this->extractPreRotationDimensions( $params, $rotation );
 472
 473                         $im->setImageBackgroundColor( new ImagickPixel( 'white' ) );
 474
 475                         // Call Imagick::thumbnailImage on each frame
 476                         foreach ( $im as $i => $frame ) {
 477                                 if ( !$frame->thumbnailImage( $width, $height, /* fit */ false ) ) {
 478                                         return $this->getMediaTransformError( $params, "Error scaling frame $i" );
 479                                 }
 480                         }
 481                         $im->setImageDepth( 8 );
 482
 483                         if ( $rotation ) {
 484                                 if ( !$im->rotateImage( new ImagickPixel( 'white' ), 360 - $rotation ) ) {
 485                                         return $this->getMediaTransformError( $params, "Error rotating $rotation degrees" );
 486                                 }
 487                         }
 488
 489                         if ( $this->isAnimatedImage( $image ) ) {
 490                                 wfDebug( __METHOD__ . ": Writing animated thumbnail\n" );
 491                                 // This is broken somehow... can't find out how to fix it
 492                                 $result = $im->writeImages( $params['dstPath'], true );
 493                         } else {
 494                                 $result = $im->writeImage( $params['dstPath'] );
 495                         }
 496                         if ( !$result ) {
 497                                 return $this->getMediaTransformError( $params,
 498                                         "Unable to write thumbnail to {$params['dstPath']}" );
 499                         }
 500                 } catch ( ImagickException $e ) {
 501                         return $this->getMediaTransformError( $params, $e->getMessage() );
 502                 }
 503
 504                 return false;
 505         }
 506
 507         /**
 508          * Transform an image using a custom command
 509          *
 510          * @param File $image File associated with this thumbnail
 511          * @param array $params Array with scaler params
 512          *
 513          * @return MediaTransformError Error object if error occurred, false (=no error) otherwise
 514          */
 515         protected function transformCustom( $image, $params ) {
 516                 # Use a custom convert command
 517                 global $wgCustomConvertCommand;
 518
 519                 # Variables: %s %d %w %h
 520                 $src = wfEscapeShellArg( $params['srcPath'] );
 521                 $dst = wfEscapeShellArg( $params['dstPath'] );
 522                 $cmd = $wgCustomConvertCommand;
 523                 $cmd = str_replace( '%s', $src, str_replace( '%d', $dst, $cmd ) ); # Filenames
 524                 $cmd = str_replace( '%h', wfEscapeShellArg( $params['physicalHeight'] ),
 525                         str_replace( '%w', wfEscapeShellArg( $params['physicalWidth'] ), $cmd ) ); # Size
 526                 wfDebug( __METHOD__ . ": Running custom convert command $cmd\n" );
 527                 wfProfileIn( 'convert' );
 528                 $retval = 0;
 529                 $err = wfShellExecWithStderr( $cmd, $retval );
 530                 wfProfileOut( 'convert' );
 531
 532                 if ( $retval !== 0 ) {
 533                         $this->logErrorForExternalProcess( $retval, $err, $cmd );
 534
 535                         return $this->getMediaTransformError( $params, $err );
 536                 }
 537
 538                 return false; # No error
 539         }
 540
 541         /**
 542          * Get a MediaTransformError with error 'thumbnail_error'
 543          *
 544          * @param array $params Parameter array as passed to the transform* functions
 545          * @param string $errMsg Error message
 546          * @return MediaTransformError
 547          */
 548         public function getMediaTransformError( $params, $errMsg ) {
 549                 return new MediaTransformError( 'thumbnail_error', $params['clientWidth'],
 550                         $params['clientHeight'], $errMsg );
 551         }
 552
 553         /**
 554          * Transform an image using the built in GD library
 555          *
 556          * @param File $image File associated with this thumbnail
 557          * @param array $params Array with scaler params
 558          *
 559          * @return MediaTransformError Error object if error occurred, false (=no error) otherwise
 560          */
 561         protected function transformGd( $image, $params ) {
 562                 # Use PHP's builtin GD library functions.
 563                 #
 564                 # First find out what kind of file this is, and select the correct
 565                 # input routine for this.
 566
 567                 $typemap = array(
 568                         'image/gif' => array( 'imagecreatefromgif', 'palette', false, 'imagegif' ),
 569                         'image/jpeg' => array( 'imagecreatefromjpeg', 'truecolor', true,
 570                                 array( __CLASS__, 'imageJpegWrapper' ) ),
 571                         'image/png' => array( 'imagecreatefrompng', 'bits', false, 'imagepng' ),
 572                         'image/vnd.wap.wbmp' => array( 'imagecreatefromwbmp', 'palette', false, 'imagewbmp' ),
 573                         'image/xbm' => array( 'imagecreatefromxbm', 'palette', false, 'imagexbm' ),
 574                 );
 575
 576                 if ( !isset( $typemap[$params['mimeType']] ) ) {
 577                         $err = 'Image type not supported';
 578                         wfDebug( "$err\n" );
 579                         $errMsg = wfMessage( 'thumbnail_image-type' )->text();
 580
 581                         return $this->getMediaTransformError( $params, $errMsg );
 582                 }
 583                 list( $loader, $colorStyle, $useQuality, $saveType ) = $typemap[$params['mimeType']];
 584
 585                 if ( !function_exists( $loader ) ) {
 586                         $err = "Incomplete GD library configuration: missing function $loader";
 587                         wfDebug( "$err\n" );
 588                         $errMsg = wfMessage( 'thumbnail_gd-library', $loader )->text();
 589
 590                         return $this->getMediaTransformError( $params, $errMsg );
 591                 }
 592
 593                 if ( !file_exists( $params['srcPath'] ) ) {
 594                         $err = "File seems to be missing: {$params['srcPath']}";
 595                         wfDebug( "$err\n" );
 596                         $errMsg = wfMessage( 'thumbnail_image-missing', $params['srcPath'] )->text();
 597
 598                         return $this->getMediaTransformError( $params, $errMsg );
 599                 }
 600
 601                 $src_image = call_user_func( $loader, $params['srcPath'] );
 602
 603                 $rotation = function_exists( 'imagerotate' ) ? $this->getRotation( $image ) : 0;
 604                 list( $width, $height ) = $this->extractPreRotationDimensions( $params, $rotation );
 605                 $dst_image = imagecreatetruecolor( $width, $height );
 606
 607                 // Initialise the destination image to transparent instead of
 608                 // the default solid black, to support PNG and GIF transparency nicely
 609                 $background = imagecolorallocate( $dst_image, 0, 0, 0 );
 610                 imagecolortransparent( $dst_image, $background );
 611                 imagealphablending( $dst_image, false );
 612
 613                 if ( $colorStyle == 'palette' ) {
 614                         // Don't resample for paletted GIF images.
 615                         // It may just uglify them, and completely breaks transparency.
 616                         imagecopyresized( $dst_image, $src_image,
 617                                 0, 0, 0, 0,
 618                                 $width, $height,
 619                                 imagesx( $src_image ), imagesy( $src_image ) );
 620                 } else {
 621                         imagecopyresampled( $dst_image, $src_image,
 622                                 0, 0, 0, 0,
 623                                 $width, $height,
 624                                 imagesx( $src_image ), imagesy( $src_image ) );
 625                 }
 626
 627                 if ( $rotation % 360 != 0 && $rotation % 90 == 0 ) {
 628                         $rot_image = imagerotate( $dst_image, $rotation, 0 );
 629                         imagedestroy( $dst_image );
 630                         $dst_image = $rot_image;
 631                 }
 632
 633                 imagesavealpha( $dst_image, true );
 634
 635                 $funcParams = array( $dst_image, $params['dstPath'] );
 636                 if ( $useQuality && isset( $params['quality'] ) ) {
 637                         $funcParams[] = $params['quality'];
 638                 }
 639                 call_user_func_array( $saveType, $funcParams );
 640
 641                 imagedestroy( $dst_image );
 642                 imagedestroy( $src_image );
 643
 644                 return false; # No error
 645         }
 646
 647         /**
 648          * Escape a string for ImageMagick's property input (e.g. -set -comment)
 649          * See InterpretImageProperties() in magick/property.c
 650          * @param string $s
 651          * @return string
 652          */
 653         function escapeMagickProperty( $s ) {
 654                 // Double the backslashes
 655                 $s = str_replace( '\\', '\\\\', $s );
 656                 // Double the percents
 657                 $s = str_replace( '%', '%%', $s );
 658                 // Escape initial - or @
 659                 if ( strlen( $s ) > 0 && ( $s[0] === '-' || $s[0] === '@' ) ) {
 660                         $s = '\\' . $s;
 661                 }
 662
 663                 return $s;
 664         }
 665
 666         /**
 667          * Escape a string for ImageMagick's input filenames. See ExpandFilenames()
 668          * and GetPathComponent() in magick/utility.c.
 669          *
 670          * This won't work with an initial ~ or @, so input files should be prefixed
 671          * with the directory name.
 672          *
 673          * Glob character unescaping is broken in ImageMagick before 6.6.1-5, but
 674          * it's broken in a way that doesn't involve trying to convert every file
 675          * in a directory, so we're better off escaping and waiting for the bugfix
 676          * to filter down to users.
 677          *
 678          * @param string $path The file path
 679          * @param bool|string $scene The scene specification, or false if there is none
 680          * @throws MWException
 681          * @return string
 682          */
 683         function escapeMagickInput( $path, $scene = false ) {
 684                 # Die on initial metacharacters (caller should prepend path)
 685                 $firstChar = substr( $path, 0, 1 );
 686                 if ( $firstChar === '~' || $firstChar === '@' ) {
 687                         throw new MWException( __METHOD__ . ': cannot escape this path name' );
 688                 }
 689
 690                 # Escape glob chars
 691                 $path = preg_replace( '/[*?\[\]{}]/', '\\\\\0', $path );
 692
 693                 return $this->escapeMagickPath( $path, $scene );
 694         }
 695
 696         /**
 697          * Escape a string for ImageMagick's output filename. See
 698          * InterpretImageFilename() in magick/image.c.
 699          * @param string $path The file path
 700          * @param bool|string $scene The scene specification, or false if there is none
 701          * @return string
 702          */
 703         function escapeMagickOutput( $path, $scene = false ) {
 704                 $path = str_replace( '%', '%%', $path );
 705
 706                 return $this->escapeMagickPath( $path, $scene );
 707         }
 708
 709         /**
 710          * Armour a string against ImageMagick's GetPathComponent(). This is a
 711          * helper function for escapeMagickInput() and escapeMagickOutput().
 712          *
 713          * @param string $path The file path
 714          * @param bool|string $scene The scene specification, or false if there is none
 715          * @throws MWException
 716          * @return string
 717          */
 718         protected function escapeMagickPath( $path, $scene = false ) {
 719                 # Die on format specifiers (other than drive letters). The regex is
 720                 # meant to match all the formats you get from "convert -list format"
 721                 if ( preg_match( '/^([a-zA-Z0-9-]+):/', $path, $m ) ) {
 722                         if ( wfIsWindows() && is_dir( $m[0] ) ) {
 723                                 // OK, it's a drive letter
 724                                 // ImageMagick has a similar exception, see IsMagickConflict()
 725                         } else {
 726                                 throw new MWException( __METHOD__ . ': unexpected colon character in path name' );
 727                         }
 728                 }
 729
 730                 # If there are square brackets, add a do-nothing scene specification
 731                 # to force a literal interpretation
 732                 if ( $scene === false ) {
 733                         if ( strpos( $path, '[' ) !== false ) {
 734                                 $path .= '[0--1]';
 735                         }
 736                 } else {
 737                         $path .= "[$scene]";
 738                 }
 739
 740                 return $path;
 741         }
 742
 743         /**
 744          * Retrieve the version of the installed ImageMagick
 745          * You can use PHPs version_compare() to use this value
 746          * Value is cached for one hour.
 747          * @return string Representing the IM version.
 748          */
 749         protected function getMagickVersion() {
 750                 global $wgMemc;
 751
 752                 $cache = $wgMemc->get( "imagemagick-version" );
 753                 if ( !$cache ) {
 754                         global $wgImageMagickConvertCommand;
 755                         $cmd = wfEscapeShellArg( $wgImageMagickConvertCommand ) . ' -version';
 756                         wfDebug( __METHOD__ . ": Running convert -version\n" );
 757                         $retval = '';
 758                         $return = wfShellExec( $cmd, $retval );
 759                         $x = preg_match( '/Version: ImageMagick ([0-9]*\.[0-9]*\.[0-9]*)/', $return, $matches );
 760                         if ( $x != 1 ) {
 761                                 wfDebug( __METHOD__ . ": ImageMagick version check failed\n" );
 762
 763                                 return null;
 764                         }
 765                         $wgMemc->set( "imagemagick-version", $matches[1], 3600 );
 766
 767                         return $matches[1];
 768                 }
 769
 770                 return $cache;
 771         }
 772
 773         // FIXME: transformImageMagick() & transformImageMagickExt() uses JPEG quality 80, here it's 95?
 774         static function imageJpegWrapper( $dst_image, $thumbPath, $quality = 95 ) {
 775                 imageinterlace( $dst_image );
 776                 imagejpeg( $dst_image, $thumbPath, $quality );
 777         }
 778
 779         /**
 780          * Returns whether the current scaler supports rotation (im and gd do)
 781          *
 782          * @return bool
 783          */
 784         public static function canRotate() {
 785                 $scaler = self::getScalerType( null, false );
 786                 switch ( $scaler ) {
 787                         case 'im':
 788                                 # ImageMagick supports autorotation
 789                                 return true;
 790                         case 'imext':
 791                                 # Imagick::rotateImage
 792                                 return true;
 793                         case 'gd':
 794                                 # GD's imagerotate function is used to rotate images, but not
 795                                 # all precompiled PHP versions have that function
 796                                 return function_exists( 'imagerotate' );
 797                         default:
 798                                 # Other scalers don't support rotation
 799                                 return false;
 800                 }
 801         }
 802
 803         /**
 804          * @see $wgEnableAutoRotation
 805          * @return bool Whether auto rotation is enabled
 806          */
 807         public static function autoRotateEnabled() {
 808                 global $wgEnableAutoRotation;
 809
 810                 if ( $wgEnableAutoRotation === null ) {
 811                         // Only enable auto-rotation when the bitmap handler can rotate
 812                         $wgEnableAutoRotation = BitmapHandler::canRotate();
 813                 }
 814
 815                 return $wgEnableAutoRotation;
 816         }
 817
 818         /**
 819          * @param File $file
 820          * @param array $params Rotate parameters.
 821          *   'rotation' clockwise rotation in degrees, allowed are multiples of 90
 822          * @since 1.21
 823          * @return bool
 824          */
 825         public function rotate( $file, $params ) {
 826                 global $wgImageMagickConvertCommand;
 827
 828                 $rotation = ( $params['rotation'] + $this->getRotation( $file ) ) % 360;
 829                 $scene = false;
 830
 831                 $scaler = self::getScalerType( null, false );
 832                 switch ( $scaler ) {
 833                         case 'im':
 834                                 $cmd = wfEscapeShellArg( $wgImageMagickConvertCommand ) . " " .
 835                                         wfEscapeShellArg( $this->escapeMagickInput( $params['srcPath'], $scene ) ) .
 836                                         " -rotate " . wfEscapeShellArg( "-$rotation" ) . " " .
 837                                         wfEscapeShellArg( $this->escapeMagickOutput( $params['dstPath'] ) );
 838                                 wfDebug( __METHOD__ . ": running ImageMagick: $cmd\n" );
 839                                 wfProfileIn( 'convert' );
 840                                 $retval = 0;
 841                                 $err = wfShellExecWithStderr( $cmd, $retval );
 842                                 wfProfileOut( 'convert' );
 843                                 if ( $retval !== 0 ) {
 844                                         $this->logErrorForExternalProcess( $retval, $err, $cmd );
 845
 846                                         return new MediaTransformError( 'thumbnail_error', 0, 0, $err );
 847                                 }
 848
 849                                 return false;
 850                         case 'imext':
 851                                 $im = new Imagick();
 852                                 $im->readImage( $params['srcPath'] );
 853                                 if ( !$im->rotateImage( new ImagickPixel( 'white' ), 360 - $rotation ) ) {
 854                                         return new MediaTransformError( 'thumbnail_error', 0, 0,
 855                                                 "Error rotating $rotation degrees" );
 856                                 }
 857                                 $result = $im->writeImage( $params['dstPath'] );
 858                                 if ( !$result ) {
 859                                         return new MediaTransformError( 'thumbnail_error', 0, 0,
 860                                                 "Unable to write image to {$params['dstPath']}" );
 861                                 }
 862
 863                                 return false;
 864                         default:
 865                                 return new MediaTransformError( 'thumbnail_error', 0, 0,
 866                                         "$scaler rotation not implemented" );
 867                 }
 868         }
 869
 870         /**
 871          * Rerurns whether the file needs to be rendered. Returns true if the
 872          * file requires rotation and we are able to rotate it.
 873          *
 874          * @param File $file
 875          * @return bool
 876          */
 877         public function mustRender( $file ) {
 878                 return self::canRotate() && $this->getRotation( $file ) != 0;
 879         }
 880 }