includes/media/Bitmap.php

   1 <?php
   2
   3 /**
   4  * @addtogroup Media
   5  */
   6 class BitmapHandler extends ImageHandler {
   7         function normaliseParams( $image, &$params ) {
   8                 global $wgMaxImageArea;
   9                 if ( !parent::normaliseParams( $image, $params ) ) {
  10                         return false;
  11                 }
  12
  13                 $mimeType = $image->getMimeType();
  14                 $srcWidth = $image->getWidth( $params['page'] );
  15                 $srcHeight = $image->getHeight( $params['page'] );
  16
  17                 # Don't thumbnail an image so big that it will fill hard drives and send servers into swap
  18                 # JPEG has the handy property of allowing thumbnailing without full decompression, so we make
  19                 # an exception for it.
  20                 if ( $mimeType !== 'image/jpeg' &&
  21                         $srcWidth * $srcHeight > $wgMaxImageArea )
  22                 {
  23                         return false;
  24                 }
  25
  26                 # Don't make an image bigger than the source
  27                 $params['physicalWidth'] = $params['width'];
  28                 $params['physicalHeight'] = $params['height'];
  29
  30                 if ( $params['physicalWidth'] >= $srcWidth ) {
  31                         $params['physicalWidth'] = $srcWidth;
  32                         $params['physicalHeight'] = $srcHeight;
  33                         return true;
  34                 }
  35
  36                 return true;
  37         }
  38
  39         function doTransform( $image, $dstPath, $dstUrl, $params, $flags = 0 ) {
  40                 global $wgUseImageMagick, $wgImageMagickConvertCommand;
  41                 global $wgCustomConvertCommand;
  42                 global $wgSharpenParameter, $wgSharpenReductionThreshold;
  43
  44                 if ( !$this->normaliseParams( $image, $params ) ) {
  45                         return new TransformParameterError( $params );
  46                 }
  47                 $physicalWidth = $params['physicalWidth'];
  48                 $physicalHeight = $params['physicalHeight'];
  49                 $clientWidth = $params['width'];
  50                 $clientHeight = $params['height'];
  51                 $srcWidth = $image->getWidth();
  52                 $srcHeight = $image->getHeight();
  53                 $mimeType = $image->getMimeType();
  54                 $srcPath = $image->getImagePath();
  55                 $retval = 0;
  56                 wfDebug( __METHOD__.": creating {$physicalWidth}x{$physicalHeight} thumbnail at $dstPath\n" );
  57
  58                 if ( $physicalWidth == $srcWidth && $physicalHeight == $srcHeight ) {
  59                         # normaliseParams (or the user) wants us to return the unscaled image
  60                         wfDebug( __METHOD__.": returning unscaled image\n" );
  61                         return new ThumbnailImage( $image->getURL(), $clientWidth, $clientHeight, $srcPath );
  62                 }
  63
  64                 if ( $wgUseImageMagick ) {
  65                         $scaler = 'im';
  66                 } elseif ( $wgCustomConvertCommand ) {
  67                         $scaler = 'custom';
  68                 } elseif ( function_exists( 'imagecreatetruecolor' ) ) {
  69                         $scaler = 'gd';
  70                 } else {
  71                         $scaler = 'client';
  72                 }
  73
  74                 if ( $scaler == 'client' ) {
  75                         # Client-side image scaling, use the source URL
  76                         # Using the destination URL in a TRANSFORM_LATER request would be incorrect
  77                         return new ThumbnailImage( $image->getURL(), $clientWidth, $clientHeight, $srcPath );
  78                 }
  79
  80                 if ( $flags & self::TRANSFORM_LATER ) {
  81                         return new ThumbnailImage( $dstUrl, $clientWidth, $clientHeight, $dstPath );
  82                 }
  83
  84                 if ( !wfMkdirParents( dirname( $dstPath ) ) ) {
  85                         return new MediaTransformError( 'thumbnail_error', $clientWidth, $clientHeight,
  86                                 wfMsg( 'thumbnail_dest_directory' ) );
  87                 }
  88
  89                 if ( $scaler == 'im' ) {
  90                         # use ImageMagick
  91
  92                         $sharpen = '';
  93                         if ( $mimeType == 'image/jpeg' ) {
  94                                 $quality = "-quality 80"; // 80%
  95                                 # Sharpening, see bug 6193
  96                                 if ( ( $physicalWidth + $physicalHeight ) / ( $srcWidth + $srcHeight ) < $wgSharpenReductionThreshold ) {
  97                                         $sharpen = "-sharpen " . wfEscapeShellArg( $wgSharpenParameter );
  98                                 }
  99                         } elseif ( $mimeType == 'image/png' ) {
 100                                 $quality = "-quality 95"; // zlib 9, adaptive filtering
 101                         } else {
 102                                 $quality = ''; // default
 103                         }
 104
 105                         # Specify white background color, will be used for transparent images
 106                         # in Internet Explorer/Windows instead of default black.
 107
 108                         # Note, we specify "-size {$physicalWidth}" and NOT "-size {$physicalWidth}x{$physicalHeight}".
 109                         # It seems that ImageMagick has a bug wherein it produces thumbnails of
 110                         # the wrong size in the second case.
 111
 112                         $cmd  =  wfEscapeShellArg($wgImageMagickConvertCommand) .
 113                                 " {$quality} -background white -size {$physicalWidth} ".
 114                                 wfEscapeShellArg($srcPath) .
 115                                 // Coalesce is needed to scale animated GIFs properly (bug 1017).
 116                                 ' -coalesce ' .
 117                                 // For the -resize option a "!" is needed to force exact size,
 118                                 // or ImageMagick may decide your ratio is wrong and slice off
 119                                 // a pixel.
 120                                 " -thumbnail " . wfEscapeShellArg( "{$physicalWidth}x{$physicalHeight}!" ) .
 121                                 " -depth 8 $sharpen " .
 122                                 wfEscapeShellArg($dstPath) . " 2>&1";
 123                         wfDebug( __METHOD__.": running ImageMagick: $cmd\n");
 124                         wfProfileIn( 'convert' );
 125                         $err = wfShellExec( $cmd, $retval );
 126                         wfProfileOut( 'convert' );
 127                 } elseif( $scaler == 'custom' ) {
 128                         # Use a custom convert command
 129                         # Variables: %s %d %w %h
 130                         $src = wfEscapeShellArg( $srcPath );
 131                         $dst = wfEscapeShellArg( $dstPath );
 132                         $cmd = $wgCustomConvertCommand;
 133                         $cmd = str_replace( '%s', $src, str_replace( '%d', $dst, $cmd ) ); # Filenames
 134                         $cmd = str_replace( '%h', $physicalHeight, str_replace( '%w', $physicalWidth, $cmd ) ); # Size
 135                         wfDebug( __METHOD__.": Running custom convert command $cmd\n" );
 136                         wfProfileIn( 'convert' );
 137                         $err = wfShellExec( $cmd, $retval );
 138                         wfProfileOut( 'convert' );
 139                 } else /* $scaler == 'gd' */ {
 140                         # Use PHP's builtin GD library functions.
 141                         #
 142                         # First find out what kind of file this is, and select the correct
 143                         # input routine for this.
 144
 145                         $typemap = array(
 146                                 'image/gif'          => array( 'imagecreatefromgif',  'palette',   'imagegif'  ),
 147                                 'image/jpeg'         => array( 'imagecreatefromjpeg', 'truecolor', array( __CLASS__, 'imageJpegWrapper' ) ),
 148                                 'image/png'          => array( 'imagecreatefrompng',  'bits',      'imagepng'  ),
 149                                 'image/vnd.wap.wbmp' => array( 'imagecreatefromwbmp', 'palette',   'imagewbmp'  ),
 150                                 'image/xbm'          => array( 'imagecreatefromxbm',  'palette',   'imagexbm'  ),
 151                         );
 152                         if( !isset( $typemap[$mimeType] ) ) {
 153                                 $err = 'Image type not supported';
 154                                 wfDebug( "$err\n" );
 155                                 return new MediaTransformError( 'thumbnail_error', $clientWidth, $clientHeight, $err );
 156                         }
 157                         list( $loader, /* $colorStyle */, $saveType ) = $typemap[$mimeType];
 158
 159                         if( !function_exists( $loader ) ) {
 160                                 $err = "Incomplete GD library configuration: missing function $loader";
 161                                 wfDebug( "$err\n" );
 162                                 return new MediaTransformError( 'thumbnail_error', $clientWidth, $clientHeight, $err );
 163                         }
 164
 165                         $src_image = call_user_func( $loader, $srcPath );
 166                         $dst_image = imagecreatetruecolor( $physicalWidth, $physicalHeight );
 167                         imagecopyresampled( $dst_image, $src_image,
 168                                                 0,0,0,0,
 169                                                 $physicalWidth, $physicalHeight, imagesx( $src_image ), imagesy( $src_image ) );
 170                         call_user_func( $saveType, $dst_image, $dstPath );
 171                         imagedestroy( $dst_image );
 172                         imagedestroy( $src_image );
 173                         $retval = 0;
 174                 }
 175
 176                 $removed = $this->removeBadFile( $dstPath, $retval );
 177                 if ( $retval != 0 || $removed ) {
 178                         wfDebugLog( 'thumbnail',
 179                                 sprintf( 'thumbnail failed on %s: error %d "%s" from "%s"',
 180                                         wfHostname(), $retval, trim($err), $cmd ) );
 181                         return new MediaTransformError( 'thumbnail_error', $clientWidth, $clientHeight, $err );
 182                 } else {
 183                         return new ThumbnailImage( $dstUrl, $clientWidth, $clientHeight, $dstPath );
 184                 }
 185         }
 186
 187         static function imageJpegWrapper( $dst_image, $thumbPath ) {
 188                 imageinterlace( $dst_image );
 189                 imagejpeg( $dst_image, $thumbPath, 95 );
 190         }
 191
 192
 193         function getMetadata( $image, $filename ) {
 194                 global $wgShowEXIF;
 195                 if( $wgShowEXIF && file_exists( $filename ) ) {
 196                         $exif = new Exif( $filename );
 197                         $data = $exif->getFilteredData();
 198                         if ( $data ) {
 199                                 $data['MEDIAWIKI_EXIF_VERSION'] = Exif::version();
 200                                 return serialize( $data );
 201                         } else {
 202                                 return '0';
 203                         }
 204                 } else {
 205                         return '';
 206                 }
 207         }
 208
 209         function getMetadataType( $image ) {
 210                 return 'exif';
 211         }
 212
 213         function isMetadataValid( $image, $metadata ) {
 214                 global $wgShowEXIF;
 215                 if ( !$wgShowEXIF ) {
 216                         # Metadata disabled and so an empty field is expected
 217                         return true;
 218                 }
 219                 if ( $metadata === '0' ) {
 220                         # Special value indicating that there is no EXIF data in the file
 221                         return true;
 222                 }
 223                 $exif = @unserialize( $metadata );
 224                 if ( !isset( $exif['MEDIAWIKI_EXIF_VERSION'] ) ||
 225                         $exif['MEDIAWIKI_EXIF_VERSION'] != Exif::version() )
 226                 {
 227                         # Wrong version
 228                         wfDebug( __METHOD__.": wrong version\n" );
 229                         return false;
 230                 }
 231                 return true;
 232         }
 233
 234 }
 235
 236 ?>