Inheritance diagram for SkPngChunkReader:

Public Member Functions
virtual bool	readChunk (const char tag[], const void *data, size_t length)=0
	This will be called by the decoder when it sees an unknown chunk. More...

Public Member Functions inherited from SkRefCntBase
	SkRefCntBase ()
	Default construct, initializing the reference count to 1.

virtual	~SkRefCntBase ()
	Destruct, asserting that the reference count is 1.

int32_t	getRefCnt () const
	Return the reference count. More...

void	validate () const

bool	unique () const
	May return true if the caller is the only owner. More...

void	ref () const
	Increment the reference count. More...

void	unref () const
	Decrement the reference count. More...

Additional Inherited Members
Protected Member Functions inherited from SkRefCntBase
void	internal_dispose_restore_refcnt_to_1 () const
	Allow subclasses to call this if they've overridden internal_dispose so they can reset fRefCnt before the destructor is called or if they choose not to call the destructor (e.g. More...

Detailed Description

Base class for optional callbacks to retrieve meta/chunk data out of a PNG encoded image as it is being decoded. Used by SkCodec.

Member Function Documentation

virtual bool SkPngChunkReader::readChunk	(	const char	tag[],
		const void *	data,
		size_t	length
	)

pure virtual

This will be called by the decoder when it sees an unknown chunk.

Use by SkCodec: Depending on the location of the unknown chunks, this callback may be called by

the factory (NewFromStream/NewFromData)
getPixels
startScanlineDecode
the first call to getScanlines/skipScanlines The callback may be called from a different thread (e.g. if the SkCodec is passed to another thread), and it may be called multiple times, if the SkCodec is used multiple times.

Parameters

tag	Name for this type of chunk.
data	Data to be interpreted by the subclass.
length	Number of bytes of data in the chunk.

Returns: true to continue decoding, or false to indicate an error, which will cause the decoder to not return the image.

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