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/* -*- Mode: C++; tab-width: 2; indent-tabs-mode: nil; c-basic-offset: 2 -*-
*
* This Source Code Form is subject to the terms of the Mozilla Public
* License, v. 2.0. If a copy of the MPL was not distributed with this
* file, You can obtain one at http://mozilla.org/MPL/2.0/. */
#ifndef mozilla_image_decoders_nsWebPDecoder_h
#define mozilla_image_decoders_nsWebPDecoder_h
#include "Decoder.h"
#include "webp/demux.h"
#include "StreamingLexer.h"
#include "SurfacePipe.h"
namespace mozilla {
namespace image {
class RasterImage;
class nsWebPDecoder : public Decoder
{
public:
virtual ~nsWebPDecoder();
protected:
LexerResult DoDecode(SourceBufferIterator& aIterator,
IResumable* aOnResume) override;
private:
friend class DecoderFactory;
// Decoders should only be instantiated via DecoderFactory.
explicit nsWebPDecoder(RasterImage* aImage);
enum class State
{
WEBP_DATA,
FINISHED_WEBP_DATA
};
LexerTransition<State> ReadHeader(const char* aData, size_t aLength);
LexerTransition<State> ReadPayload(const char* aData, size_t aLength);
LexerTransition<State> FinishedData();
nsresult CreateFrame(const nsIntRect& aFrameRect);
void EndFrame();
nsresult GetDataBuffer(const uint8_t*& aData, size_t& aLength);
nsresult SaveDataBuffer(const uint8_t* aData, size_t aLength);
LexerTransition<State> ReadSingle(const uint8_t* aData, size_t aLength,
bool aAppend, const IntRect& aFrameRect);
LexerTransition<State> ReadMultiple(const uint8_t* aData, size_t aLength);
StreamingLexer<State> mLexer;
/// The SurfacePipe used to write to the output surface.
SurfacePipe mPipe;
/// The buffer used to accumulate data until the complete WebP header is received.
Vector<uint8_t> mData;
/// The libwebp output buffer descriptor pointing to the decoded data.
WebPDecBuffer mBuffer;
/// The libwebp incremental decoder descriptor, wraps mBuffer.
WebPIDecoder* mDecoder;
/// Blend method for the current frame.
BlendMethod mBlend;
/// Disposal method for the current frame.
DisposalMethod mDisposal;
/// Frame timeout for the current frame;
FrameTimeout mTimeout;
/// Surface format for the current frame.
gfx::SurfaceFormat mFormat;
/// The last row of decoded pixels written to mPipe.
int mLastRow;
/// Number of decoded frames.
uint32_t mCurrentFrame;
};
} // namespace image
} // namespace mozilla
#endif // mozilla_image_decoders_nsWebPDecoder_h
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