| Index: trunk/phase3/includes/media/XCF.php |
| — | — | @@ -42,56 +42,76 @@ |
| 43 | 43 | return self::getXCFMetaData( $filename ); |
| 44 | 44 | } |
| 45 | 45 | |
| | 46 | + /** |
| | 47 | + * Metadata for a given XCF file |
| | 48 | + * |
| | 49 | + * Will return false if file magic signature is not recognized |
| | 50 | + * @author Hexmode |
| | 51 | + * @author Hashar |
| | 52 | + * |
| | 53 | + * @param $filename String Full path to a XCF file |
| | 54 | + * @return false|metadata array just like PHP getimagesize() |
| | 55 | + */ |
| 46 | 56 | static function getXCFMetaData( $filename ) { |
| 47 | | - global $wgImageMagickIdentifyCommand; |
| | 57 | + # Decode master structure |
| | 58 | + $f = fopen( $filename, 'rb' ); |
| | 59 | + if( !$f ) { |
| | 60 | + return false; |
| | 61 | + } |
| | 62 | + # The image structure always starts at offset 0 in the XCF file. |
| | 63 | + # So we just read it :-) |
| | 64 | + $binaryHeader = fread( $f, 26 ); |
| | 65 | + fclose($f); |
| 48 | 66 | |
| 49 | | - $cmd = wfEscapeShellArg( $wgImageMagickIdentifyCommand ) . ' -verbose ' . wfEscapeShellArg( $filename ); |
| 50 | | - wfDebug( __METHOD__ . ": Running $cmd \n" ); |
| | 67 | + # Master image structure: |
| | 68 | + # |
| | 69 | + # byte[9] "gimp xcf " File type magic |
| | 70 | + # byte[4] version XCF version |
| | 71 | + # "file" - version 0 |
| | 72 | + # "v001" - version 1 |
| | 73 | + # "v002" - version 2 |
| | 74 | + # byte 0 Zero-terminator for version tag |
| | 75 | + # uint32 width With of canvas |
| | 76 | + # uint32 height Height of canvas |
| | 77 | + # uint32 base_type Color mode of the image; one of |
| | 78 | + # 0: RGB color |
| | 79 | + # 1: Grayscale |
| | 80 | + # 2: Indexed color |
| | 81 | + # (enum GimpImageBaseType in libgimpbase/gimpbaseenums.h) |
| | 82 | + $header = unpack( |
| | 83 | + "A9magic" # A: space padded |
| | 84 | + . "/a5version" # a: zero padded |
| | 85 | + . "/Nwidth" # \ |
| | 86 | + . "/Nheight" # N: unsigned long 32bit big endian |
| | 87 | + . "/Nbase_type" # / |
| | 88 | + , $binaryHeader |
| | 89 | + ); |
| 51 | 90 | |
| 52 | | - $retval = null; |
| 53 | | - $return = wfShellExec( $cmd, $retval ); |
| 54 | | - if( $retval !== 0 ) { |
| 55 | | - wfDebug( __METHOD__ . ": error encountered while running $cmd\n" ); |
| | 91 | + # Check values |
| | 92 | + if( $header['magic'] !== 'gimp xcf' ) { |
| | 93 | + var_dump( $header ); |
| | 94 | + wfDebug( __METHOD__ . " '$filename' has invalid magic signature.\n" ); |
| 56 | 95 | return false; |
| 57 | 96 | } |
| | 97 | + # TODO: we might want to check for sane values of width and height |
| 58 | 98 | |
| 59 | | - $colorspace = preg_match_all( '/ *Colorspace: RGB/', $return, $match ); |
| 60 | | - $frameCount = preg_match_all( '/ *Geometry: ([0-9]+x[0-9]+)\+[+0-9]*/', $return, $match ); |
| 61 | | - wfDebug( __METHOD__ . ": Got $frameCount matches\n" ); |
| | 99 | + wfDebug( __METHOD__ . ": canvas size of '$filename' is {$header['width']} x {$header['height']} px\n" ); |
| 62 | 100 | |
| 63 | | - /* if( $frameCount == 1 ) { */ |
| 64 | | - /* preg_match( '/([0-9]+)x([0-9]+)/sm', $match[1][0], $m ); */ |
| 65 | | - /* $sizeX = $m[1]; */ |
| 66 | | - /* $sizeY = $m[2]; */ |
| 67 | | - /* } else { */ |
| 68 | | - $sizeX = 0; |
| 69 | | - $sizeY = 0; |
| 70 | | - |
| 71 | | - # Find out the largest width and height used in any frame |
| 72 | | - foreach( $match[1] as $res ) { |
| 73 | | - preg_match( '/([0-9]+)x([0-9]+)/sm', $res, $m ); |
| 74 | | - if( $m[1] > $sizeX ) { |
| 75 | | - $sizeX = $m[1]; |
| 76 | | - } |
| 77 | | - if( $m[2] > $sizeY ) { |
| 78 | | - $sizeY = $m[2]; |
| 79 | | - } |
| 80 | | - } |
| 81 | | - /* } */ |
| 82 | | - |
| 83 | | - wfDebug( __METHOD__ . ": Found $sizeX x $sizeY x $frameCount \n" ); |
| 84 | | - |
| 85 | 101 | # Forge a return array containing metadata information just like getimagesize() |
| 86 | 102 | # See PHP documentation at: http://www.php.net/getimagesize |
| 87 | 103 | $metadata = array(); |
| 88 | | - $metadata['frameCount'] = $frameCount; |
| 89 | | - $metadata[0] = $sizeX; |
| 90 | | - $metadata[1] = $sizeY; |
| 91 | | - $metadata[2] = null; |
| 92 | | - $metadata[3] = "height=\"$sizeY\" width=\"$sizeX\""; |
| | 104 | + $metadata[0] = $header['width']; |
| | 105 | + $metadata[1] = $header['height']; |
| | 106 | + $metadata[2] = null; # IMAGETYPE constant, none exist for XCF. |
| | 107 | + $metadata[3] = sprintf( |
| | 108 | + 'height="%s" width="%s"', $header['height'], $header['width'] |
| | 109 | + ); |
| 93 | 110 | $metadata['mime'] = 'image/x-xcf'; |
| 94 | | - $metadata['channels'] = $colorspace == 1 ? 3 : 4; |
| | 111 | + $metadata['channels'] = null; |
| | 112 | + $metadata['bits'] = 8; # Always 8-bits per color |
| 95 | 113 | |
| | 114 | + assert( '7 == count($metadata); # return array must contains 7 elements just like getimagesize() return' ); |
| | 115 | + |
| 96 | 116 | return $metadata; |
| 97 | 117 | } |
| 98 | 118 | |