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/*
* Copyright (C) 2006 Apple Inc. All rights reserved.
*
* Redistribution and use in source and binary forms, with or without
* modification, are permitted provided that the following conditions
* are met:
* 1. Redistributions of source code must retain the above copyright
* notice, this list of conditions and the following disclaimer.
* 2. Redistributions in binary form must reproduce the above copyright
* notice, this list of conditions and the following disclaimer in the
* documentation and/or other materials provided with the distribution.
*
* THIS SOFTWARE IS PROVIDED BY APPLE INC. ``AS IS'' AND ANY
* EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
* IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR
* PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL APPLE INC. OR
* CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL,
* EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO,
* PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR
* PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY
* OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
* (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
* OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
*/
#pragma once
#include "ImageDecoder.h"
#if ENABLE(APNG)
#include <png.h>
#endif
namespace WebCore {
class PNGImageReader;
// This class decodes the PNG image format.
class PNGImageDecoder final : public ImageDecoder {
public:
PNGImageDecoder(AlphaOption, GammaAndColorProfileOption);
virtual ~PNGImageDecoder();
// ImageDecoder
String filenameExtension() const override { return "png"; }
#if ENABLE(APNG)
size_t frameCount() const override { return m_frameCount; }
RepetitionCount repetitionCount() const override;
#endif
bool isSizeAvailable() override;
bool setSize(const IntSize&) override;
ImageFrame* frameBufferAtIndex(size_t index) override;
// CAUTION: setFailed() deletes |m_reader|. Be careful to avoid
// accessing deleted memory, especially when calling this from inside
// PNGImageReader!
bool setFailed() override;
// Callbacks from libpng
void headerAvailable();
void rowAvailable(unsigned char* rowBuffer, unsigned rowIndex, int interlacePass);
void pngComplete();
#if ENABLE(APNG)
void readChunks(png_unknown_chunkp);
void frameHeader();
void init();
void clearFrameBufferCache(size_t clearBeforeFrame) override;
#endif
bool isComplete() const
{
if (m_frameBufferCache.isEmpty())
return false;
for (auto& imageFrame : m_frameBufferCache) {
if (!imageFrame.isComplete())
return false;
}
return true;
}
bool isCompleteAtIndex(size_t index)
{
return (index < m_frameBufferCache.size() && m_frameBufferCache[index].isComplete());
}
private:
// Decodes the image. If |onlySize| is true, stops decoding after
// calculating the image size. If decoding fails but there is no more
// data coming, sets the "decode failure" flag.
void decode(bool onlySize, unsigned haltAtFrame);
#if ENABLE(APNG)
void initFrameBuffer(size_t frameIndex);
void frameComplete();
int processingStart(png_unknown_chunkp);
int processingFinish();
void fallbackNotAnimated();
#endif
std::unique_ptr<PNGImageReader> m_reader;
bool m_doNothingOnFailure;
unsigned m_currentFrame;
#if ENABLE(APNG)
png_structp m_png;
png_infop m_info;
bool m_isAnimated;
bool m_frameInfo;
bool m_frameIsHidden;
bool m_hasInfo;
int m_gamma;
size_t m_frameCount;
unsigned m_playCount;
unsigned m_totalFrames;
unsigned m_sizePLTE;
unsigned m_sizetRNS;
unsigned m_sequenceNumber;
unsigned m_width;
unsigned m_height;
unsigned m_xOffset;
unsigned m_yOffset;
unsigned m_delayNumerator;
unsigned m_delayDenominator;
unsigned m_dispose;
unsigned m_blend;
png_byte m_dataIHDR[12 + 13];
png_byte m_dataPLTE[12 + 256 * 3];
png_byte m_datatRNS[12 + 256];
#endif
};
} // namespace WebCore
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