Handler for DjVu images. More...

Inheritance diagram for DjVuHandler:

[legend]

Collaboration diagram for DjVuHandler:

[legend]

Public Member Functions
	doTransform ( $image, $dstPath, $dstUrl, $params, $flags=0)

	getDjVuImage ( $image, $path)
	Cache an instance of DjVuImage in an Image object, return that instance.

	getImageSize ( $image, $path)
	Get an image size array like that returned by getimagesize(), or false if it can't be determined.

	getMetadata ( $image, $path)
	Get handler-specific metadata which will be saved in the img_metadata field.

	getMetadataType ( $image)
	Get a string describing the type of metadata, for display purposes.

	getMetaTree ( $image, $gettext=false)
	Cache a document tree for the DjVu XML metadata.

	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.

	getPageText (File $image, $page)

	getParamMap ()

	getThumbType ( $ext, $mime, $params=null)
	Get the thumbnail extension and MIME type for a given source MIME type.

	isEnabled ()

	isExpensiveToThumbnail ( $file)
	True if creating thumbnails from the file is large or otherwise resource-intensive.

	isMetadataValid ( $image, $metadata)
	Check if the metadata string is valid for this handler.

	isMultiPage ( $file)

	makeParamString ( $params)

	mustRender ( $file)

	pageCount (File $image)
	Page count for a multi-page document, false if unsupported or unknown.

	parseParamString ( $str)

	validateParam ( $name, $value)

Public Member Functions inherited from ImageHandler
	canRender ( $file)

	getDimensionsString ( $file)

	getImageArea ( $image)
	Function that returns the number of pixels to be thumbnailed.

	getLongDesc ( $file)

	getScriptedTransform ( $image, $script, $params)

	getShortDesc ( $file)

	normaliseParams ( $image, &$params)

	sanitizeParamsForBucketing ( $params)
	Returns a normalised params array for which parameters have been cleaned up for bucketing purposes.

	validateThumbParams (&$width, &$height, $srcWidth, $srcHeight, $mimeType)
	Validate thumbnail parameters and fill in the correct height.

Public Member Functions inherited from MediaHandler
	canAnimateThumbnail ( $file)
	If the material is animated, we can animate the thumbnail.

	canRotate ()
	True if the handler can rotate the media.

	convertMetadataVersion ( $metadata, $version=1)
	Convert metadata version.

	filterThumbnailPurgeList (&$files, $options)
	Remove files from the purge list.

	formatMetadata ( $image, $context=false)
	Get an array structure that looks like this:

	formatMetadataHelper ( $metadataArray, $context=false)
	sorts the visible/invisible field.

	getAvailableLanguages (File $file)
	Get list of languages file can be viewed in.

	getCommonMetaArray (File $file)
	Get an array of standard (FormatMetadata type) metadata values.

	getContentHeaders ( $metadata)
	Get useful response headers for GET/HEAD requests for a file with the given metadata.

	getDefaultRenderLanguage (File $file)
	On file types that support renderings in multiple languages, which language is used by default if unspecified.

	getEntireText (File $file)
	Get the text of the entire document.

	getLength ( $file)
	If its an audio file, return the length of the file.

	getMatchedLanguage ( $userPreferredLanguage, array $availableLanguages)
	When overridden in a descendant class, returns a language code most suiting.

	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.

	getTransform ( $image, $dstPath, $dstUrl, $params)
	Get a MediaTransformOutput object representing the transformed output.

	getWarningConfig ( $file)
	Gets configuration for the file warning message.

	isAnimatedImage ( $file)
	The material is an image, and is animated.

	isVectorized ( $file)
	The material is vectorized and thus scaling is lossless.

	parserTransformHook ( $parser, $file)
	Modify the parser object post-transform.

	removeBadFile ( $dstPath, $retval=0)
	Check for zero-sized thumbnails.

	supportsBucketing ()
	Returns whether or not this handler supports the chained generation of thumbnails according to buckets.

	verifyUpload ( $fileName)
	File validation hook called on upload.

Public Attributes
const	EXPENSIVE_SIZE_LIMIT = 10485760

Public Attributes inherited from MediaHandler
const	MAX_ERR_LOG_SIZE = 65535
	Max length of error logged by logErrorForExternalProcess()

const	METADATA_BAD = false

const	METADATA_COMPATIBLE = 2

const	METADATA_GOOD = true

const	TRANSFORM_LATER = 1

Protected Member Functions
	extractTreesFromMetadata ( $metadata)
	Extracts metadata and text trees from metadata XML in string form.

	getDimensionInfo (File $file)

	getDimensionInfoFromMetaTree ( $metatree)
	Given an XML metadata tree, returns dimension information about the document.

	getScriptParams ( $params)

Protected Member Functions inherited from MediaHandler
	logErrorForExternalProcess ( $retval, $err, $cmd)
	Log an error that occurred in an external process.

	visibleMetadataFields ()
	Get a list of metadata items which should be displayed when the metadata table is collapsed.

Private Member Functions
	getUnserializedMetadata (File $file)
	Get metadata, unserializing it if necessary.

Additional Inherited Members
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.

static	getGeneralLongDesc ( $file)
	Used instead of getLongDesc if there is no handler registered for file.

static	getGeneralShortDesc ( $file)
	Used instead of getShortDesc if there is no handler registered for file.

static	getHandler ( $type)
	Get a MediaHandler for a given MIME type from the instance cache.

static	getMetadataVersion ()
	Get metadata version.

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.

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.

Detailed Description

Handler for DjVu images.

Definition at line 31 of file DjVuHandler.php.

Member Function Documentation

◆ doTransform()

DjVuHandler::doTransform	(	$image,
		$dstPath,
		$dstUrl,
		$params,
		$flags = `0`
	)

Parameters

File	$image
string	$dstPath
string	$dstUrl
array	$params
int	$flags

Returns: MediaTransformError|ThumbnailImage|TransformParameterError

Reimplemented from MediaHandler.

Reimplemented in MockDjVuHandler.

Definition at line 150 of file DjVuHandler.php.

References $image, $params, $wgDjvuPostProcessor, $wgDjvuRenderer, PoolCounterWork\execute(), function, MediaHandler\logErrorForExternalProcess(), ImageHandler\normaliseParams(), MediaHandler\removeBadFile(), use, wfDebug(), wfDebugLog(), wfHostname(), wfMessage(), wfMkdirParents(), and wfShellExec().

◆ extractTreesFromMetadata()

DjVuHandler::extractTreesFromMetadata ( $metadata )

protected

Extracts metadata and text trees from metadata XML in string form.

Parameters

string $metadata XML metadata as a string

Returns: array

Definition at line 325 of file DjVuHandler.php.

References $e, as, and wfDebug().

Referenced by getMetaTree().

◆ getDimensionInfo()

DjVuHandler::getDimensionInfo ( File $file )

protected

Definition at line 406 of file DjVuHandler.php.

References $cache, $file, function, getDimensionInfoFromMetaTree(), getMetaTree(), and use.

Referenced by getPageDimensions(), and pageCount().

◆ getDimensionInfoFromMetaTree()

DjVuHandler::getDimensionInfoFromMetaTree ( $metatree )

protected

Given an XML metadata tree, returns dimension information about the document.

Parameters

bool | SimpleXMLElement $metatree The file's XML metadata tree

Returns: bool|array

Definition at line 424 of file DjVuHandler.php.

Referenced by getDimensionInfo().

◆ getDjVuImage()

DjVuHandler::getDjVuImage	(	$image,
		$path
	)

Cache an instance of DjVuImage in an Image object, return that instance.

Parameters

File \| FSFile	$image
string	$path

Returns: DjVuImage

Definition at line 244 of file DjVuHandler.php.

References $image, and $path.

Referenced by getImageSize(), and getMetadata().

◆ getImageSize()

DjVuHandler::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	$image	The image object, or false if there isn't one. Warning, FSFile::getPropsFromPath might pass an FSFile instead of File (!)
string	$path	The filename

Returns: array|bool Follow the format of PHP getimagesize() internal function. See https://secure.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.

Reimplemented from ImageHandler.

Definition at line 354 of file DjVuHandler.php.

References $image, $path, and getDjVuImage().

◆ getMetadata()

DjVuHandler::getMetadata	(	$image,
		$path
	)

Get handler-specific metadata which will be saved in the img_metadata field.

Parameters

File \| FSFile	$image	The image object, or false if there isn't one. Warning, FSFile::getPropsFromPath might pass an FSFile instead of File (!)
string	$path	The filename

Returns: string A string of metadata in php serialized form (Run through serialize())

Reimplemented from MediaHandler.

Definition at line 369 of file DjVuHandler.php.

References $image, $path, getDjVuImage(), serialize(), and wfDebug().

◆ getMetadataType()

DjVuHandler::getMetadataType ( $image )

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

Note: This method is currently unused.

Parameters

File $image

Returns: string

Reimplemented from MediaHandler.

Definition at line 381 of file DjVuHandler.php.

◆ getMetaTree()

DjVuHandler::getMetaTree	(	$image,
		$gettext = `false`
	)

Cache a document tree for the DjVu XML metadata.

Parameters

File	$image
bool	$gettext	DOCUMENT (Default: false)

Returns: bool|SimpleXMLElement

Definition at line 294 of file DjVuHandler.php.

References $image, extractTreesFromMetadata(), getUnserializedMetadata(), isMetadataValid(), and wfDebug().

Referenced by getDimensionInfo(), and getPageText().

◆ getPageDimensions()

DjVuHandler::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.

Returns false if unknown.

It is expected that handlers for paged media (e.g. DjVuHandler) will override this method so that it gives the correct results for each specific page of the file, using the $page argument.

Note: For non-paged media, use getImageSize.

Parameters

File	$image
int	$page	What page to get dimensions of

Returns: array|bool

Reimplemented from MediaHandler.

Definition at line 395 of file DjVuHandler.php.

References getDimensionInfo().

◆ getPageText()

DjVuHandler::getPageText	(	File	$image,
			$page
	)

Parameters

File	$image
int	$page	Page number to get information for

Returns: bool|string Page text or false when no text found.

Reimplemented from MediaHandler.

Definition at line 451 of file DjVuHandler.php.

References getMetaTree().

◆ getParamMap()

DjVuHandler::getParamMap ( )

Returns: array

Reimplemented from ImageHandler.

Definition at line 76 of file DjVuHandler.php.

◆ getScriptParams()

DjVuHandler::getScriptParams ( $params )

protected

Parameters

array $params

Returns: array

Reimplemented from ImageHandler.

Definition at line 135 of file DjVuHandler.php.

References $params.

◆ getThumbType()

DjVuHandler::getThumbType	(	$ext,
		$mime,
		$params = `null`
	)

Get the thumbnail extension and MIME type for a given source MIME type.

Parameters

string	$ext	Extension of original file
string	$mime	MIME type of original file
array \| null	$params	Handler specific rendering parameters

Returns: array Thumbnail extension and MIME type

Reimplemented from MediaHandler.

Definition at line 358 of file DjVuHandler.php.

References $wgDjvuOutputExtension.

◆ getUnserializedMetadata()

DjVuHandler::getUnserializedMetadata ( File $file )

private

Get metadata, unserializing it if necessary.

Parameters

File $file The DjVu file in question

Returns: string XML metadata as a string.

Exceptions

MWException

Definition at line 263 of file DjVuHandler.php.

References $file, and unserialize().

Referenced by getMetaTree().

◆ isEnabled()

DjVuHandler::isEnabled ( )

Returns: bool

Reimplemented from MediaHandler.

Reimplemented in MockDjVuHandler.

Definition at line 37 of file DjVuHandler.php.

References $wgDjvuDump, $wgDjvuRenderer, $wgDjvuToXML, and wfDebug().

◆ isExpensiveToThumbnail()

DjVuHandler::isExpensiveToThumbnail ( $file )

True if creating thumbnails from the file is large or otherwise resource-intensive.

Parameters

File $file

Returns: bool

Reimplemented from MediaHandler.

Definition at line 61 of file DjVuHandler.php.

References $file.

◆ isMetadataValid()

DjVuHandler::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.

Parameters

File	$image
string	$metadata	The metadata in serialized form

Returns: bool

Reimplemented from MediaHandler.

Definition at line 385 of file DjVuHandler.php.

References serialize().

Referenced by getMetaTree().

◆ isMultiPage()

DjVuHandler::isMultiPage ( $file )

Parameters

File $file

Returns: bool

Reimplemented from MediaHandler.

Definition at line 69 of file DjVuHandler.php.

◆ makeParamString()

DjVuHandler::makeParamString ( $params )

Parameters

array $params

Returns: bool|string

Reimplemented from ImageHandler.

Definition at line 109 of file DjVuHandler.php.

References $params.

◆ mustRender()

DjVuHandler::mustRender ( $file )

Parameters

File $file

Returns: bool

Reimplemented from MediaHandler.

Definition at line 52 of file DjVuHandler.php.

◆ pageCount()

DjVuHandler::pageCount ( File $file )

Page count for a multi-page document, false if unsupported or unknown.

Parameters

File $file

Returns: bool

Reimplemented from MediaHandler.

Definition at line 389 of file DjVuHandler.php.

References getDimensionInfo().

Referenced by MockDjVuHandler\doTransform().

◆ parseParamString()

DjVuHandler::parseParamString ( $str )

Parameters

string $str

Returns: array|bool

Reimplemented from ImageHandler.

Definition at line 122 of file DjVuHandler.php.

◆ validateParam()

DjVuHandler::validateParam	(	$name,
		$value
	)

Parameters

string	$name
mixed	$value

Returns: bool

Reimplemented from ImageHandler.

Definition at line 88 of file DjVuHandler.php.

References $name, and $value.

Member Data Documentation

◆ EXPENSIVE_SIZE_LIMIT

const DjVuHandler::EXPENSIVE_SIZE_LIMIT = 10485760

Definition at line 32 of file DjVuHandler.php.

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

includes/media/DjVuHandler.php

Public Member Functions

Public Attributes

Protected Member Functions

Private Member Functions

Additional Inherited Members

Detailed Description

Member Function Documentation

◆ doTransform()

◆ extractTreesFromMetadata()

◆ getDimensionInfo()

◆ getDimensionInfoFromMetaTree()

◆ getDjVuImage()

◆ getImageSize()

◆ getMetadata()

◆ getMetadataType()

◆ getMetaTree()

◆ getPageDimensions()

◆ getPageText()

◆ getParamMap()

◆ getScriptParams()

◆ getThumbType()

◆ getUnserializedMetadata()

◆ isEnabled()

◆ isExpensiveToThumbnail()

◆ isMetadataValid()

◆ isMultiPage()

◆ makeParamString()

◆ mustRender()

◆ pageCount()

◆ parseParamString()

◆ validateParam()

Member Data Documentation

◆ EXPENSIVE_SIZE_LIMIT