/* * 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 . bool readChunk(const char tag[], const void * data, size_t length) = 0 ;#endif // SkPngChunkReader_DEFINED
Messung V0.5 in Prozent C=71 H=91 G=81
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