MediaWiki  master
PNGHandler Class Reference

Handler for PNG images. More...

Inheritance diagram for PNGHandler:
Collaboration diagram for PNGHandler:

Public Member Functions

 canAnimateThumbnail ( $image)
 We do not support making APNG thumbnails, so always false. More...
 
 formatMetadata ( $image, $context=false)
 
 getCommonMetaArray (File $image)
 Get a file type independent array of metadata. More...
 
 getLength ( $file)
 Return the duration of an APNG file. More...
 
 getLongDesc ( $image)
 
 getMetadata ( $image, $filename)
 
 getMetadataType ( $image)
 Get a string describing the type of metadata, for display purposes. More...
 
 isAnimatedImage ( $image)
 
 isMetadataValid ( $image, $metadata)
 Check if the metadata string is valid for this handler. More...
 
 supportsBucketing ()
 Returns whether or not this handler supports the chained generation of thumbnails according to buckets Stable to override. More...
 
- Public Member Functions inherited from BitmapHandler
 autoRotateEnabled ()
 
 canRotate ()
 Returns whether the current scaler supports rotation (im and gd do) Stable to override. More...
 
 makeParamString ( $params)
 Merge a parameter array into a string appropriate for inclusion in filenames.
Parameters
array$paramsArray of parameters that have been through normaliseParams.
Returns
string
Stable to override Stable to override More...
 
 normaliseParams ( $image, &$params)
 Stable to override. More...
 
 parseParamString ( $str)
 Parse a param string made with makeParamString back into an array.
Parameters
string$strThe parameter string without file name (e.g. 122px)
Returns
array|bool Array of parameters or false on failure.
Stable to override Stable to override More...
 
 rotate ( $file, $params)
 Stable to override. More...
 
 validateParam ( $name, $value)
 Validate a thumbnail parameter at parse time.Return true to accept the parameter, and false to reject it. If you return false, the parser will do something quiet and forgiving.
Parameters
string$name
mixed$value
Stable to override Stable to override More...
 
- Public Member Functions inherited from TransformationalImageHandler
 doTransform ( $image, $dstPath, $dstUrl, $params, $flags=0)
 Create a thumbnail. More...
 
 extractPreRotationDimensions ( $params, $rotation)
 Extracts the width/height if the image will be scaled before rotating. More...
 
 getMediaTransformError ( $params, $errMsg)
 Get a MediaTransformError with error 'thumbnail_error'. More...
 
 isImageAreaOkForThumbnaling ( $file, &$params)
 Check if the file is smaller than the maximum image area for thumbnailing. More...
 
 mustRender ( $file)
 Returns whether the file needs to be rendered. More...
 
- Public Member Functions inherited from ImageHandler
 canRender ( $file)
 True if the handled types can be transformed.Stable to override
Parameters
File$file
Returns
bool
Stable to override More...
 
 getDimensionsString ( $file)
 Shown in file history box on image description page.Stable to override
Parameters
File$file
Returns
string Dimensions
Stable to override More...
 
 getImageArea ( $image)
 Function that returns the number of pixels to be thumbnailed. More...
 
 getImageSize ( $image, $path)
 Get an image size array like that returned by getimagesize(), or false if it can't be determined.This function is used for determining the width, height and bitdepth directly from an image. The results are stored in the database in the img_width, img_height, img_bits fields.
Note
If this is a multipage file, return the width and height of the first page.
Parameters
File | FSFile$imageThe image object, or false if there isn't one. Warning, FSFile::getPropsFromPath might pass an FSFile instead of File (!)
string$pathThe filename
Returns
array|false Follow the format of PHP getimagesize() internal function. See https://www.php.net/getimagesize. MediaWiki will only ever use the first two array keys (the width and height), and the 'bits' associative key. All other array keys are ignored. Returning a 'bits' key is optional as not all formats have a notion of "bitdepth". Returns false on failure.
Stable to override More...
 
 getParamMap ()
 Get an associative array mapping magic word IDs to parameter names.Will be used by the parser to identify parameters. Stable to override More...
 
 getScriptedTransform ( $image, $script, $params)
 Get a MediaTransformOutput object representing an alternate of the transformed output which will call an intermediary thumbnail assist script.Used when the repository has a thumbnailScriptUrl option configured.Return false to fall back to the regular getTransform().Stable to override
Parameters
File$image
string$script
array$params
Returns
bool|ThumbnailImage
Stable to override More...
 
 getShortDesc ( $file)
 Short description.Shown on Special:Search results.Stable to override
Parameters
File$file
Returns
string
Stable to override More...
 
 sanitizeParamsForBucketing ( $params)
 Returns a normalised params array for which parameters have been cleaned up for bucketing purposes Stable to override.
Parameters
array$params
Returns
array
Stable to override More...
 
- Public Member Functions inherited from MediaHandler
 convertMetadataVersion ( $metadata, $version=1)
 Convert metadata version. More...
 
 filterThumbnailPurgeList (&$files, $options)
 Remove files from the purge list. More...
 
 getAvailableLanguages (File $file)
 Get list of languages file can be viewed in. More...
 
 getContentHeaders ( $metadata)
 Get useful response headers for GET/HEAD requests for a file with the given metadata Stable to override. More...
 
 getDefaultRenderLanguage (File $file)
 On file types that support renderings in multiple languages, which language is used by default if unspecified. More...
 
 getEntireText (File $file)
 Get the text of the entire document. More...
 
 getMatchedLanguage ( $userPreferredLanguage, array $availableLanguages)
 When overridden in a descendant class, returns a language code most suiting. More...
 
 getPageDimensions (File $image, $page)
 Get an associative array of page dimensions Currently "width" and "height" are understood, but this might be expanded in the future. More...
 
 getPageText (File $image, $page)
 Generic getter for text layer. More...
 
 getRotation ( $file)
 On supporting image formats, try to read out the low-level orientation of the file and return the angle that the file needs to be rotated to be viewed. More...
 
 getThumbType ( $ext, $mime, $params=null)
 Get the thumbnail extension and MIME type for a given source MIME type. More...
 
 getTransform ( $image, $dstPath, $dstUrl, $params)
 Get a MediaTransformOutput object representing the transformed output. More...
 
 getWarningConfig ( $file)
 Gets configuration for the file warning message. More...
 
 isEnabled ()
 False if the handler is disabled for all files Stable to override. More...
 
 isExpensiveToThumbnail ( $file)
 True if creating thumbnails from the file is large or otherwise resource-intensive. More...
 
 isMultiPage ( $file)
 True if the type has multi-page capabilities. More...
 
 isVectorized ( $file)
 The material is vectorized and thus scaling is lossless. More...
 
 pageCount (File $file)
 Page count for a multi-page document, false if unsupported or unknown. More...
 
 parserTransformHook ( $parser, $file)
 Modify the parser object post-transform. More...
 
 removeBadFile ( $dstPath, $retval=0)
 Check for zero-sized thumbnails. More...
 
 verifyUpload ( $fileName)
 File validation hook called on upload. More...
 

Private Attributes

const BROKEN_FILE = '0'
 

Additional Inherited Members

- Static Public Member Functions inherited from BitmapHandler
static imageJpegWrapper ( $dst_image, $thumbPath, $quality=null)
 Callback for transformGd when transforming jpeg images. More...
 
- Static Public Member Functions inherited from MediaHandler
static fitBoxWidth ( $boxWidth, $boxHeight, $maxHeight)
 Calculate the largest thumbnail width for a given original file size such that the thumbnail's height is at most $maxHeight. More...
 
static getGeneralLongDesc ( $file)
 Used instead of getLongDesc if there is no handler registered for file. More...
 
static getGeneralShortDesc ( $file)
 Used instead of getShortDesc if there is no handler registered for file. More...
 
static getHandler ( $type)
 Get a MediaHandler for a given MIME type from the instance cache. More...
 
static getMetadataVersion ()
 Get metadata version. More...
 
static getPageRangesByDimensions ( $pagesByDimensions)
 Converts a dimensions array about a potentially multipage document from an exhaustive list of ordered page numbers to a list of page ranges. More...
 
- Public Attributes inherited from MediaHandler
const METADATA_BAD = false
 
const METADATA_COMPATIBLE = 2
 
const METADATA_GOOD = true
 
const TRANSFORM_LATER = 1
 
- Protected Member Functions inherited from BitmapHandler
 getScalerType ( $dstPath, $checkDstPath=true)
 Returns which scaler type should be used. More...
 
 imageMagickSubsampling ( $pixelFormat)
 Get ImageMagick subsampling factors for the target JPEG pixel format. More...
 
 transformCustom ( $image, $params)
 Transform an image using a custom command. More...
 
 transformGd ( $image, $params)
 Transform an image using the built in GD library. More...
 
 transformImageMagick ( $image, $params)
 Transform an image using ImageMagick Stable to override. More...
 
 transformImageMagickExt ( $image, $params)
 Transform an image using the Imagick PHP extension. More...
 
- Protected Member Functions inherited from TransformationalImageHandler
 escapeMagickInput ( $path, $scene=false)
 Escape a string for ImageMagick's input filenames. More...
 
 escapeMagickOutput ( $path, $scene=false)
 Escape a string for ImageMagick's output filename. More...
 
 escapeMagickPath ( $path, $scene=false)
 Armour a string against ImageMagick's GetPathComponent(). More...
 
 escapeMagickProperty ( $s)
 Escape a string for ImageMagick's property input (e.g. More...
 
 getClientScalingThumbnailImage ( $image, $scalerParams)
 Get a ThumbnailImage that respresents an image that will be scaled client side. More...
 
 getMagickVersion ()
 Retrieve the version of the installed ImageMagick You can use PHPs version_compare() to use this value Value is cached for one hour. More...
 
 getThumbnailSource ( $file, $params)
 Get the source file for the transform. More...
 
- Protected Member Functions inherited from ImageHandler
 getScriptParams ( $params)
 Stable to override More...
 
- Protected Member Functions inherited from MediaHandler
 formatMetadataHelper ( $metadataArray, $context=false)
 sorts the visible/invisible field. More...
 
 logErrorForExternalProcess ( $retval, $err, $cmd)
 Log an error that occurred in an external process. More...
 
 visibleMetadataFields ()
 Get a list of metadata items which should be displayed when the metadata table is collapsed. More...
 
- Static Protected Member Functions inherited from MediaHandler
static addMeta (&$array, $visibility, $type, $id, $value, $param=false)
 This is used to generate an array element for each metadata value That array is then used to generate the table of metadata values on the image page. More...
 

Detailed Description

Handler for PNG images.

Definition at line 29 of file PNGHandler.php.

Member Function Documentation

◆ canAnimateThumbnail()

PNGHandler::canAnimateThumbnail (   $image)

We do not support making APNG thumbnails, so always false.

Parameters
File$image
Returns
bool False

Reimplemented from MediaHandler.

Definition at line 106 of file PNGHandler.php.

◆ formatMetadata()

PNGHandler::formatMetadata (   $image,
  $context = false 
)
Parameters
File$image
bool | IContextSource$contextContext to use (optional)
Returns
array|bool

Reimplemented from MediaHandler.

Definition at line 55 of file PNGHandler.php.

References MediaHandler\formatMetadataHelper(), and getCommonMetaArray().

◆ getCommonMetaArray()

PNGHandler::getCommonMetaArray ( File  $image)

Get a file type independent array of metadata.

Parameters
File$image
Returns
array The metadata array

Reimplemented from MediaHandler.

Definition at line 70 of file PNGHandler.php.

References File\getMetadata(), and unserialize().

Referenced by formatMetadata().

◆ getLength()

PNGHandler::getLength (   $file)

Return the duration of an APNG file.

Shown in the &query=imageinfo&iiprop=size api query.

Parameters
File$file
Returns
float The duration of the file.

Reimplemented from MediaHandler.

Definition at line 185 of file PNGHandler.php.

References $file, and unserialize().

◆ getLongDesc()

PNGHandler::getLongDesc (   $image)
Parameters
File$image
Returns
string

Reimplemented from ImageHandler.

Definition at line 145 of file PNGHandler.php.

References $wgLang, unserialize(), and wfMessage().

◆ getMetadata()

PNGHandler::getMetadata (   $image,
  $filename 
)
Parameters
File | FSFile$image
string$filename
Returns
string

Reimplemented from MediaHandler.

Definition at line 37 of file PNGHandler.php.

References BROKEN_FILE, BitmapMetadataHandler\PNG(), serialize(), and wfDebug().

◆ getMetadataType()

PNGHandler::getMetadataType (   $image)

Get a string describing the type of metadata, for display purposes.

Stable to override

Note
This method is currently unused.
Parameters
File$image
Returns
string

Reimplemented from MediaHandler.

Definition at line 110 of file PNGHandler.php.

◆ isAnimatedImage()

PNGHandler::isAnimatedImage (   $image)
Parameters
File$image
Returns
bool

Reimplemented from MediaHandler.

Definition at line 89 of file PNGHandler.php.

References unserialize().

◆ isMetadataValid()

PNGHandler::isMetadataValid (   $image,
  $metadata 
)

Check if the metadata string is valid for this handler.

If it returns MediaHandler::METADATA_BAD (or false), Image will reload the metadata from the file and update the database. MediaHandler::METADATA_GOOD for if the metadata is a-ok, MediaHandler::METADATA_COMPATIBLE if metadata is old but backwards compatible (which may or may not trigger a metadata reload).

Note
Returning self::METADATA_BAD will trigger a metadata reload from file on page view. Always returning this from a broken file, or suddenly triggering as bad metadata for a large number of files can cause performance problems.

Stable to override

Parameters
File$image
string$metadataThe metadata in serialized form
Returns
bool|int

Reimplemented from MediaHandler.

Definition at line 114 of file PNGHandler.php.

References MediaHandler\METADATA_BAD, MediaHandler\METADATA_COMPATIBLE, MediaHandler\METADATA_GOOD, unserialize(), PNGMetadataExtractor\VERSION, and wfDebug().

◆ supportsBucketing()

PNGHandler::supportsBucketing ( )

Returns whether or not this handler supports the chained generation of thumbnails according to buckets Stable to override.

Returns
bool
Since
1.24

Reimplemented from MediaHandler.

Definition at line 200 of file PNGHandler.php.

Member Data Documentation

◆ BROKEN_FILE

const PNGHandler::BROKEN_FILE = '0'
private

Definition at line 30 of file PNGHandler.php.

Referenced by getMetadata().


The documentation for this class was generated from the following file: