blob: 0ee8a9ecc7275ba6098f85da3b48b1ce77cd77f7 [file] [log] [blame]
* Copyright 2015 Google Inc.
* Use of this source code is governed by a BSD-style license that can be
* found in the LICENSE file.
#ifndef SkPngChunkReader_DEFINED
#define SkPngChunkReader_DEFINED
#include "include/core/SkRefCnt.h"
#include "include/core/SkTypes.h"
* SkPngChunkReader
* Base class for optional callbacks to retrieve meta/chunk data out of a PNG
* encoded image as it is being decoded.
* Used by SkCodec.
class SkPngChunkReader : public SkRefCnt {
* 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.
* @param tag Name for this type of chunk.
* @param data Data to be interpreted by the subclass.
* @param length Number of bytes of data in the chunk.
* @return true to continue decoding, or false to indicate an error, which
* will cause the decoder to not return the image.
virtual bool readChunk(const char tag[], const void* data, size_t length) = 0;
#endif // SkPngChunkReader_DEFINED