MediaWiki master
SvgHandler Class Reference

Handler for SVG images. More...

Inherits ImageHandler.

Collaboration diagram for SvgHandler:

Public Member Functions

 allowRenderingByUserAgent ( $file)
 
 canAnimateThumbnail ( $file)
 We do not support making animated svg thumbnails.
 
 doTransform ( $image, $dstPath, $dstUrl, $params, $flags=0)
 
 formatMetadata ( $file, $context=false)
 
 getAvailableLanguages (File $file)
 Which languages (systemLanguage attribute) is supported.
 
 getCommonMetaArray (File $file)
 Get an array of standard (FormatMetadata type) metadata values.
 
 getDefaultRenderLanguage (File $file)
 What language to render file in if none selected.
 
 getLongDesc ( $file)
 Subtitle for the image.
 
 getMatchedLanguage ( $userPreferredLanguage, array $svgLanguages)
 SVG's systemLanguage matching rules state: 'The systemLanguage attribute ... [e]valuates to "true" if one of the languages indicated by user preferences exactly equals one of the languages given in the value of this parameter, or if one of the languages indicated by user preferences exactly equals a prefix of one of the languages given in the value of this parameter such that the first tag character following the prefix is "-".
 
 getMetadataType ( $image)
 Get a string describing the type of metadata, for display purposes.
 
 getParamMap ()
 Get an associative array mapping magic word IDs to parameter names.Will be used by the parser to identify parameters.

Returns
string[]
Stability: stable
to override
Returns
string[]

 
 getSizeAndMetadata ( $state, $filename)
 
 getThumbType ( $ext, $mime, $params=null)
 Get the thumbnail extension and MIME type for a given source MIME type.
 
 isAnimatedImage ( $file)
 
 isEnabled ()
 False if the handler is disabled for all files.
 
 isFileMetadataValid ( $image)
 Check if the metadata is valid for this handler.
 
 isVectorized ( $file)
 The material is vectorized and thus scaling is lossless.
 
 makeParamString ( $params)
 
 mustRender ( $file)
 True if handled types cannot be displayed directly in a browser but can be rendered.
 
 normaliseParams ( $image, &$params)
 
 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|false Array of parameters or false on failure.
Stability: stable
to override

 
 rasterize ( $srcPath, $dstPath, $width, $height, $lang=false)
 Transform an SVG file to PNG This function can be called outside of thumbnail contexts.
 
 validateParam ( $name, $value)
 
- Public Member Functions inherited from ImageHandler
 canRender ( $file)
 True if the handled types can be transformed.
Stability: stable
to override
Parameters
File$file
Returns
bool

 
 getDimensionsString ( $file)
 Shown in file history box on image description page.
Stability: stable
to override
Parameters
File$file
Returns
string Dimensions

 
 getImageArea ( $image)
 Function that returns the number of pixels to be thumbnailed.
 
 getImageSize ( $image, $path)
 Get an image size array like that returned by getimagesize(), or false if it can't be determined.
 
 getScriptedTransform ( $image, $script, $params)
 Get a MediaTransformOutput object representing an alternate of the transformed output which will call an intermediary thumbnail assist script.Used when the repository has a thumbnailScriptUrl option configured.Return false to fall back to the regular getTransform().
Stability: stable
to override
Parameters
File$image
string$script
array$params
Returns
ThumbnailImage|false

 
 getShortDesc ( $file)
 Short description.Shown on Special:Search results.
Stability: stable
to override
Parameters
File$file
Returns
string

 
 sanitizeParamsForBucketing ( $params)
 Returns a normalised params array for which parameters have been cleaned up for bucketing purposes.
Stability: stable
to override
Parameters
array$params
Returns
array

 
- Public Member Functions inherited from MediaHandler
 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.
 
 getContentHeaders ( $metadata)
 Get useful response headers for GET/HEAD requests for a file with the given metadata.
 
 getEntireText (File $file)
 Get the text of the entire document.
 
 getLength ( $file)
 If it's an audio file, return the length of the file.
 
 getMetadata ( $image, $path)
 Get handler-specific metadata which will be saved in the img_metadata field.
 
 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)
 Generic getter for text layer.
 
 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.
 
 getSizeAndMetadataWithFallback ( $file, $path)
 Get the metadata array and the image size, with b/c fallback.
 
 getTransform ( $image, $dstPath, $dstUrl, $params)
 Get a MediaTransformOutput object representing the transformed output.
 
 getWarningConfig ( $file)
 Gets configuration for the file warning message.
 
 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)
 True if the type has multi-page capabilities.
 
 pageCount (File $file)
 Page count for a multi-page document, false if unsupported or unknown.
 
 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.
 
 useSplitMetadata ()
 If this returns true, LocalFile may split metadata up and store its constituent items separately.
 
 verifyUpload ( $fileName)
 File validation hook called on upload.
 

Static Public Member Functions

static rasterizeImagickExt ( $srcPath, $dstPath, $width, $height)
 
- 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.
 

Public Attributes

const SVG_METADATA_VERSION = 2
 
- Public Attributes inherited from MediaHandler
const METADATA_BAD = false
 
const METADATA_COMPATIBLE = 2
 
const METADATA_GOOD = true
 
const TRANSFORM_LATER = 1
 

Protected Member Functions

 getLanguageFromParams (array $params)
 Determines render language from image parameters This is a lowercase IETF language.
 
 getScriptParams ( $params)
 
 normaliseParamsInternal ( $image, $params)
 Code taken out of normaliseParams() for testability.
 
 validateMetadata ( $unser)
 
 visibleMetadataFields ()
 Get a list of metadata items which should be displayed when the metadata table is collapsed.
 
- Protected Member Functions inherited from MediaHandler
 formatMetadataHelper ( $metadataArray, $context=false)
 sorts the visible/invisible field.
 
 formatTag (string $key, $vals, $context=false)
 Override default formatting for the given metadata field.
 
 hasMostDerivedMethod ( $name)
 Check whether a method is implemented in the most derived class.
 
 logErrorForExternalProcess ( $retval, $err, $cmd)
 Log an error that occurred in an external process.
 
 useLegacyMetadata ()
 If this returns true, the new method getSizeAndMetadata() will not be called.
 

Additional Inherited Members

- 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 SVG images.

Definition at line 35 of file SvgHandler.php.

Member Function Documentation

◆ allowRenderingByUserAgent()

SvgHandler::allowRenderingByUserAgent (   $file)

Definition at line 67 of file SvgHandler.php.

References getAvailableLanguages().

Referenced by canAnimateThumbnail(), doTransform(), and mustRender().

◆ canAnimateThumbnail()

SvgHandler::canAnimateThumbnail (   $file)

We do not support making animated svg thumbnails.

Parameters
File$file
Returns
bool

Reimplemented from MediaHandler.

Definition at line 194 of file SvgHandler.php.

References allowRenderingByUserAgent().

◆ doTransform()

SvgHandler::doTransform (   $image,
  $dstPath,
  $dstUrl,
  $params,
  $flags = 0 
)
Parameters
File$image
string$dstPath
string$dstUrl
array$params
int$flags
Returns
MediaTransformError|ThumbnailImage|TransformParameterError|false

Reimplemented from MediaHandler.

Definition at line 255 of file SvgHandler.php.

References $params, allowRenderingByUserAgent(), getLanguageFromParams(), normaliseParams(), rasterize(), validateMetadata(), wfDebugLog(), wfHostname(), wfMessage(), wfMkdirParents(), wfRandomString(), and wfTempDir().

◆ formatMetadata()

SvgHandler::formatMetadata (   $file,
  $context = false 
)
Parameters
File$file
IContextSource | false$context
Returns
array[]|false

Reimplemented from MediaHandler.

Definition at line 510 of file SvgHandler.php.

References validateMetadata(), and visibleMetadataFields().

◆ getAvailableLanguages()

SvgHandler::getAvailableLanguages ( File  $file)

Which languages (systemLanguage attribute) is supported.

Note
This list is not guaranteed to be exhaustive. To avoid OOM errors, we only look at first bit of a file. Thus all languages on this list are present in the file, but its possible for the file to have a language not on this list.
Parameters
File$file
Returns
string[] Array of language codes, or empty if no language switching supported.

Reimplemented from MediaHandler.

Definition at line 120 of file SvgHandler.php.

References File\getMetadataArray(), and validateMetadata().

Referenced by allowRenderingByUserAgent().

◆ getCommonMetaArray()

SvgHandler::getCommonMetaArray ( File  $file)

Get an array of standard (FormatMetadata type) metadata values.

The returned data is largely the same as that from getMetadata(), but formatted in a standard, stable, handler-independent way. The idea being that some values like ImageDescription or Artist are universal and should be retrievable in a handler generic way.

The specific properties are the type of properties that can be handled by the FormatMetadata class. These values are exposed to the user via the filemetadata parser function.

Details of the response format of this function can be found at https://www.mediawiki.org/wiki/Manual:File_metadata_handling tl/dr: the response is an associative array of properties keyed by name, but the value can be complex. You probably want to call one of the FormatMetadata::flatten* functions on the property values before using them, or call FormatMetadata::getFormattedData() on the full response array, which transforms all values into prettified, human-readable text.

Subclasses overriding this function must return a value which is a valid API response fragment (all associative array keys are valid XML tagnames).

Note, if the file simply has no metadata, but the handler supports this interface, it should return an empty array, not false.

Stability: stable
to override
Parameters
File$file
Returns
array|false False if interface not supported
Since
1.23

Reimplemented from MediaHandler.

Definition at line 623 of file SvgHandler.php.

References File\getMetadataArray(), and validateMetadata().

◆ getDefaultRenderLanguage()

SvgHandler::getDefaultRenderLanguage ( File  $file)

What language to render file in if none selected.

Parameters
File$fileLanguage code
Returns
string

Reimplemented from MediaHandler.

Definition at line 185 of file SvgHandler.php.

◆ getLanguageFromParams()

SvgHandler::getLanguageFromParams ( array  $params)
protected

Determines render language from image parameters This is a lowercase IETF language.

Parameters
array$params
Returns
string

Definition at line 175 of file SvgHandler.php.

References $params.

Referenced by doTransform(), and makeParamString().

◆ getLongDesc()

SvgHandler::getLongDesc (   $file)

Subtitle for the image.

Different from the base class so it can be denoted that SVG's have a "nominal" resolution, and not a fixed one, as well as so animation can be denoted.

Parameters
File$file
Returns
string

Reimplemented from ImageHandler.

Definition at line 434 of file SvgHandler.php.

References isAnimatedImage(), validateMetadata(), and wfMessage().

◆ getMatchedLanguage()

SvgHandler::getMatchedLanguage (   $userPreferredLanguage,
array  $svgLanguages 
)

SVG's systemLanguage matching rules state: 'The systemLanguage attribute ... [e]valuates to "true" if one of the languages indicated by user preferences exactly equals one of the languages given in the value of this parameter, or if one of the languages indicated by user preferences exactly equals a prefix of one of the languages given in the value of this parameter such that the first tag character following the prefix is "-".

'

Return the first element of $svgLanguages that matches $userPreferredLanguage

See also
https://www.w3.org/TR/SVG/struct.html#SystemLanguageAttribute
Parameters
string$userPreferredLanguage
string[]$svgLanguages
Returns
string|null

Reimplemented from MediaHandler.

Definition at line 148 of file SvgHandler.php.

◆ getMetadataType()

SvgHandler::getMetadataType (   $image)

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

Stability: stable
to override
Note
This method is currently unused.
Parameters
File$image
Returns
string|false

Reimplemented from MediaHandler.

Definition at line 484 of file SvgHandler.php.

◆ getParamMap()

SvgHandler::getParamMap ( )

Get an associative array mapping magic word IDs to parameter names.Will be used by the parser to identify parameters.

Returns
string[]
Stability: stable
to override
Returns
string[]

Stability: stable
to override
Returns
string[]

Reimplemented from ImageHandler.

Definition at line 606 of file SvgHandler.php.

◆ getScriptParams()

SvgHandler::getScriptParams (   $params)
protected
Parameters
array$params
Returns
array

Reimplemented from ImageHandler.

Definition at line 614 of file SvgHandler.php.

References $params.

◆ getSizeAndMetadata()

SvgHandler::getSizeAndMetadata (   $state,
  $filename 
)
Parameters
MediaHandlerState$state
string$filename
Returns
array

Reimplemented from ImageHandler.

Definition at line 454 of file SvgHandler.php.

References wfDebug().

◆ getThumbType()

SvgHandler::getThumbType (   $ext,
  $mime,
  $params = null 
)

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

Stability: stable
to override
Parameters
string$extExtension of original file
string$mimeMIME type of original file
array | null$paramsHandler specific rendering parameters
Returns
array Thumbnail extension and MIME type

Reimplemented from MediaHandler.

Definition at line 421 of file SvgHandler.php.

◆ isAnimatedImage()

SvgHandler::isAnimatedImage (   $file)
Parameters
File$file
Returns
bool

Reimplemented from MediaHandler.

Definition at line 98 of file SvgHandler.php.

References validateMetadata().

Referenced by getLongDesc().

◆ isEnabled()

SvgHandler::isEnabled ( )

False if the handler is disabled for all files.

Stability: stable
to override
Returns
bool

Reimplemented from MediaHandler.

Definition at line 51 of file SvgHandler.php.

References wfDebug().

◆ isFileMetadataValid()

SvgHandler::isFileMetadataValid (   $image)

Check if the metadata 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.

This was introduced in 1.37 to replace isMetadataValid(), which took a serialized string as a parameter. Handlers overriding this method are expected to use accessors to get the metadata out of the File. The reasons for the change were to get rid of serialization, and to allow handlers to partially load metadata with getMetadataItem(). For example a handler could just validate a version number.

Stability: stable
to override
Since
1.37
Parameters
File$image
Returns
bool|int

Reimplemented from MediaHandler.

Definition at line 488 of file SvgHandler.php.

References validateMetadata().

◆ isVectorized()

SvgHandler::isVectorized (   $file)

The material is vectorized and thus scaling is lossless.

Stability: stable
to override
Parameters
File$file
Returns
bool

Reimplemented from MediaHandler.

Definition at line 90 of file SvgHandler.php.

◆ makeParamString()

SvgHandler::makeParamString (   $params)
Parameters
array$paramsName=>value pairs of parameters
Returns
string|false Filename to use

Reimplemented from ImageHandler.

Definition at line 578 of file SvgHandler.php.

References $params, and getLanguageFromParams().

◆ mustRender()

SvgHandler::mustRender (   $file)

True if handled types cannot be displayed directly in a browser but can be rendered.

Stability: stable
to override
Parameters
File$file
Returns
bool

Reimplemented from MediaHandler.

Definition at line 86 of file SvgHandler.php.

References allowRenderingByUserAgent().

◆ normaliseParams()

SvgHandler::normaliseParams (   $image,
$params 
)
Parameters
File$image
array&$params
Returns
bool

Reimplemented from ImageHandler.

Definition at line 203 of file SvgHandler.php.

References $params, and normaliseParamsInternal().

Referenced by doTransform().

◆ normaliseParamsInternal()

SvgHandler::normaliseParamsInternal (   $image,
  $params 
)
protected

Code taken out of normaliseParams() for testability.

Since
1.33
Parameters
File$image
array$params
Returns
array Modified $params

Definition at line 221 of file SvgHandler.php.

References $params.

Referenced by normaliseParams().

◆ parseParamString()

SvgHandler::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|false Array of parameters or false on failure.
Stability: stable
to override

Stability: stable
to override

Reimplemented from ImageHandler.

Definition at line 591 of file SvgHandler.php.

◆ rasterize()

SvgHandler::rasterize (   $srcPath,
  $dstPath,
  $width,
  $height,
  $lang = false 
)

Transform an SVG file to PNG This function can be called outside of thumbnail contexts.

Parameters
string$srcPath
string$dstPath
int$width
int$height
string | false$langLanguage code of the language to render the SVG in
Returns
bool|MediaTransformError

Definition at line 354 of file SvgHandler.php.

References MediaHandler\logErrorForExternalProcess(), MediaHandler\removeBadFile(), wfDebug(), and wfShellExecWithStderr().

Referenced by doTransform(), and MediaWiki\ResourceLoader\Image\rasterize().

◆ rasterizeImagickExt()

static SvgHandler::rasterizeImagickExt (   $srcPath,
  $dstPath,
  $width,
  $height 
)
static

Definition at line 406 of file SvgHandler.php.

◆ validateMetadata()

SvgHandler::validateMetadata (   $unser)
protected

◆ validateParam()

SvgHandler::validateParam (   $name,
  $value 
)
Parameters
string$nameParameter name
mixed$valueParameter value
Returns
bool Validity

Reimplemented from ImageHandler.

Definition at line 554 of file SvgHandler.php.

◆ visibleMetadataFields()

SvgHandler::visibleMetadataFields ( )
protected

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

Stability: stable
to override
Returns
string[]

Reimplemented from MediaHandler.

Definition at line 501 of file SvgHandler.php.

Referenced by formatMetadata().

Member Data Documentation

◆ SVG_METADATA_VERSION

const SvgHandler::SVG_METADATA_VERSION = 2

Definition at line 36 of file SvgHandler.php.


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