mirror of
https://github.com/roytam1/UXP.git
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wolfbeast
92 lines
2.4 KiB
C++
92 lines
2.4 KiB
C++
/* -*- Mode: C++; tab-width: 2; indent-tabs-mode: nil; c-basic-offset: 2 -*-
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*
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* This Source Code Form is subject to the terms of the Mozilla Public
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* License, v. 2.0. If a copy of the MPL was not distributed with this
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* file, You can obtain one at http://mozilla.org/MPL/2.0/. */
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#ifndef mozilla_image_decoders_nsWebPDecoder_h
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#define mozilla_image_decoders_nsWebPDecoder_h
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#include "Decoder.h"
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#include "webp/demux.h"
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#include "StreamingLexer.h"
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#include "SurfacePipe.h"
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namespace mozilla {
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namespace image {
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class RasterImage;
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class nsWebPDecoder : public Decoder
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{
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public:
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virtual ~nsWebPDecoder();
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protected:
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LexerResult DoDecode(SourceBufferIterator& aIterator,
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IResumable* aOnResume) override;
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private:
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friend class DecoderFactory;
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// Decoders should only be instantiated via DecoderFactory.
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explicit nsWebPDecoder(RasterImage* aImage);
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enum class State
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{
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WEBP_DATA,
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FINISHED_WEBP_DATA
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};
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LexerTransition<State> ReadHeader(const char* aData, size_t aLength);
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LexerTransition<State> ReadPayload(const char* aData, size_t aLength);
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LexerTransition<State> FinishedData();
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nsresult CreateFrame(const nsIntRect& aFrameRect);
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void EndFrame();
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nsresult GetDataBuffer(const uint8_t*& aData, size_t& aLength);
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nsresult SaveDataBuffer(const uint8_t* aData, size_t aLength);
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LexerTransition<State> ReadSingle(const uint8_t* aData, size_t aLength,
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bool aAppend, const IntRect& aFrameRect);
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LexerTransition<State> ReadMultiple(const uint8_t* aData, size_t aLength);
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StreamingLexer<State> mLexer;
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/// The SurfacePipe used to write to the output surface.
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SurfacePipe mPipe;
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/// The buffer used to accumulate data until the complete WebP header is received.
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Vector<uint8_t> mData;
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/// The libwebp output buffer descriptor pointing to the decoded data.
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WebPDecBuffer mBuffer;
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/// The libwebp incremental decoder descriptor, wraps mBuffer.
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WebPIDecoder* mDecoder;
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/// Blend method for the current frame.
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BlendMethod mBlend;
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/// Disposal method for the current frame.
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DisposalMethod mDisposal;
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/// Frame timeout for the current frame;
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FrameTimeout mTimeout;
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/// Surface format for the current frame.
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gfx::SurfaceFormat mFormat;
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/// The last row of decoded pixels written to mPipe.
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int mLastRow;
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/// Number of decoded frames.
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uint32_t mCurrentFrame;
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};
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} // namespace image
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} // namespace mozilla
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#endif // mozilla_image_decoders_nsWebPDecoder_h
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