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/*
* Copyright (C) 2006 Apple Computer, 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 COMPUTER, 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 COMPUTER, 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.
*/
#ifndef THIRD_PARTY_BLINK_RENDERER_PLATFORM_IMAGE_DECODERS_PNG_PNG_IMAGE_DECODER_H_
#define THIRD_PARTY_BLINK_RENDERER_PLATFORM_IMAGE_DECODERS_PNG_PNG_IMAGE_DECODER_H_
#include <memory>
#include "third_party/blink/renderer/platform/image-decoders/image_decoder.h"
#include "third_party/blink/renderer/platform/image-decoders/png/png_image_reader.h"
#include "third_party/blink/renderer/platform/wtf/time.h"
namespace blink {
class PLATFORM_EXPORT PNGImageDecoder final : public ImageDecoder {
WTF_MAKE_NONCOPYABLE(PNGImageDecoder);
public:
PNGImageDecoder(AlphaOption,
HighBitDepthDecodingOption,
const ColorBehavior&,
size_t max_decoded_bytes,
size_t offset = 0);
~PNGImageDecoder() override;
// ImageDecoder:
String FilenameExtension() const override { return "png"; }
bool SetSize(unsigned, unsigned) override;
int RepetitionCount() const override;
bool ImageIsHighBitDepth() override;
bool FrameIsReceivedAtIndex(size_t) const override;
TimeDelta FrameDurationAtIndex(size_t) const override;
bool SetFailed() override;
// Callbacks from libpng
void HeaderAvailable();
void RowAvailable(unsigned char* row, unsigned row_index, int);
void FrameComplete();
void SetColorSpace();
void SetRepetitionCount(int);
void SetBitDepth();
private:
using ParseQuery = PNGImageReader::ParseQuery;
// ImageDecoder:
void DecodeSize() override { Parse(ParseQuery::kSize); }
void Decode(size_t) override;
void Parse(ParseQuery);
size_t DecodeFrameCount() override;
void InitializeNewFrame(size_t) override;
void ClearFrameBuffer(size_t) override;
bool CanReusePreviousFrameBuffer(size_t) const override;
std::unique_ptr<PNGImageReader> reader_;
const unsigned offset_;
size_t current_frame_;
int repetition_count_;
bool has_alpha_channel_;
bool current_buffer_saw_alpha_;
bool decode_to_half_float_;
size_t bit_depth_;
std::unique_ptr<ImageFrame::PixelData[]> color_transform_scanline_;
};
} // namespace blink
#endif