MediaWiki  1.27.1
XCF.php
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1 <?php
35 class XCFHandler extends BitmapHandler {
40  public function mustRender( $file ) {
41  return true;
42  }
43 
52  function getThumbType( $ext, $mime, $params = null ) {
53  return [ 'png', 'image/png' ];
54  }
55 
63  function getImageSize( $image, $filename ) {
64  $header = self::getXCFMetaData( $filename );
65  if ( !$header ) {
66  return false;
67  }
68 
69  # Forge a return array containing metadata information just like getimagesize()
70  # See PHP documentation at: http://www.php.net/getimagesize
71  return [
72  0 => $header['width'],
73  1 => $header['height'],
74  2 => null, # IMAGETYPE constant, none exist for XCF.
75  3 => "height=\"{$header['height']}\" width=\"{$header['width']}\"",
76  'mime' => 'image/x-xcf',
77  'channels' => null,
78  'bits' => 8, # Always 8-bits per color
79  ];
80  }
81 
92  static function getXCFMetaData( $filename ) {
93  # Decode master structure
94  $f = fopen( $filename, 'rb' );
95  if ( !$f ) {
96  return false;
97  }
98  # The image structure always starts at offset 0 in the XCF file.
99  # So we just read it :-)
100  $binaryHeader = fread( $f, 26 );
101  fclose( $f );
102 
120  try {
121  $header = wfUnpack(
122  "A9magic" . # A: space padded
123  "/a5version" . # a: zero padded
124  "/Nwidth" . # \
125  "/Nheight" . # N: unsigned long 32bit big endian
126  "/Nbase_type", # /
127  $binaryHeader
128  );
129  } catch ( Exception $mwe ) {
130  return false;
131  }
132 
133  # Check values
134  if ( $header['magic'] !== 'gimp xcf' ) {
135  wfDebug( __METHOD__ . " '$filename' has invalid magic signature.\n" );
136 
137  return false;
138  }
139  # TODO: we might want to check for sane values of width and height
140 
141  wfDebug( __METHOD__ .
142  ": canvas size of '$filename' is {$header['width']} x {$header['height']} px\n" );
143 
144  return $header;
145  }
146 
157  public function getMetadata( $file, $filename ) {
158  $header = self::getXCFMetaData( $filename );
159  $metadata = [];
160  if ( $header ) {
161  // Try to be consistent with the names used by PNG files.
162  // Unclear from base media type if it has an alpha layer,
163  // so just assume that it does since it "potentially" could.
164  switch ( $header['base_type'] ) {
165  case 0:
166  $metadata['colorType'] = 'truecolour-alpha';
167  break;
168  case 1:
169  $metadata['colorType'] = 'greyscale-alpha';
170  break;
171  case 2:
172  $metadata['colorType'] = 'index-coloured';
173  break;
174  default:
175  $metadata['colorType'] = 'unknown';
176 
177  }
178  } else {
179  // Marker to prevent repeated attempted extraction
180  $metadata['error'] = true;
181  }
182  return serialize( $metadata );
183  }
184 
192  public function isMetadataValid( $file, $metadata ) {
193  if ( !$metadata ) {
194  // Old metadata when we just put an empty string in there
195  return self::METADATA_BAD;
196  } else {
197  return self::METADATA_GOOD;
198  }
199  }
200 
208  protected function getScalerType( $dstPath, $checkDstPath = true ) {
209  return "im";
210  }
211 
220  public function canRender( $file ) {
221  MediaWiki\suppressWarnings();
222  $xcfMeta = unserialize( $file->getMetadata() );
223  MediaWiki\restoreWarnings();
224  if ( isset( $xcfMeta['colorType'] ) && $xcfMeta['colorType'] === 'index-coloured' ) {
225  return false;
226  }
227  return parent::canRender( $file );
228  }
229 }
canRender($file)
Can we render this file?
Definition: XCF.php:220
getMetadata($file, $filename)
Store the channel type.
Definition: XCF.php:157
getImageSize($image, $filename)
Get width and height from the XCF header.
Definition: XCF.php:63
if($ext== 'php'||$ext== 'php5') $mime
Definition: router.php:65
getThumbType($ext, $mime, $params=null)
Render files as PNG.
Definition: XCF.php:52
wfDebug($text, $dest= 'all', array $context=[])
Sends a line to the debug log if enabled or, optionally, to a comment in output.
Handler for the Gimp's native file format; getimagesize() doesn't support these files.
Definition: XCF.php:35
mustRender($file)
Definition: XCF.php:40
unserialize($serialized)
Definition: ApiMessage.php:102
getScalerType($dstPath, $checkDstPath=true)
Must use "im" for XCF.
Definition: XCF.php:208
static getXCFMetaData($filename)
Metadata for a given XCF file.
Definition: XCF.php:92
$params
in the sidebar</td >< td > font color
isMetadataValid($file, $metadata)
Should we refresh the metadata.
Definition: XCF.php:192
injection txt This is an overview of how MediaWiki makes use of dependency injection The design described here grew from the discussion of RFC T384 The term dependency this means that anything an object needs to operate should be injected from the the object itself should only know narrow no concrete implementation of the logic it relies on The requirement to inject everything typically results in an architecture that based on two main types of and essentially stateless service objects that use other service objects to operate on the value objects As of the beginning MediaWiki is only starting to use the DI approach Much of the code still relies on global state or direct resulting in a highly cyclical dependency which acts as the top level factory for services in MediaWiki which can be used to gain access to default instances of various services MediaWikiServices however also allows new services to be defined and default services to be redefined Services are defined or redefined by providing a callback the instantiator that will return a new instance of the service When it will create an instance of MediaWikiServices and populate it with the services defined in the files listed by thereby bootstrapping the DI framework Per $wgServiceWiringFiles lists includes ServiceWiring php
Definition: injection.txt:35
wfUnpack($format, $data, $length=false)
Wrapper around php's unpack.
Generic handler for bitmap images.
Definition: Bitmap.php:29
this hook is for auditing only or null if authentication failed before getting that far or null if we can t even determine that probably a stub it is not rendered in wiki pages or galleries in category pages allow injecting custom HTML after the section Any uses of the hook need to handle escaping see BaseTemplate::getToolbox and BaseTemplate::makeListItem for details on the format of individual items inside of this array or by returning and letting standard HTTP rendering take place modifiable or by returning false and taking over the output modifiable modifiable after all normalizations have been except for the $wgMaxImageArea check $image
Definition: hooks.txt:762
serialize()
Definition: ApiMessage.php:94