/** * 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 { public: /** * 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.
*/ virtualbool readChunk(constchar tag[], constvoid* data, size_t length) = 0;
}; #endif// SkPngChunkReader_DEFINED
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