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09266efcbc
Rather than change every use of IntSize/Rect/Point in image/, this patch attempts to draw the line at the relevant parts of the decoding pipeline to prevent confusion about which size and orientation we are working with. Differential Revision: https://phabricator.services.mozilla.com/D126381
106 lines
3.0 KiB
C++
106 lines
3.0 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 final : public Decoder {
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public:
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virtual ~nsWebPDecoder();
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DecoderType GetType() const override { return DecoderType::WEBP; }
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protected:
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LexerResult DoDecode(SourceBufferIterator& aIterator,
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IResumable* aOnResume) override;
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Maybe<Telemetry::HistogramID> SpeedHistogram() const 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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void ApplyColorProfile(const char* aProfile, size_t aLength);
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LexerResult UpdateBuffer(SourceBufferIterator& aIterator,
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SourceBufferIterator::State aState);
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LexerResult ReadData();
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LexerResult ReadHeader(WebPDemuxer* aDemuxer, bool aIsComplete);
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LexerResult ReadPayload(WebPDemuxer* aDemuxer, bool aIsComplete);
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nsresult CreateFrame(const OrientedIntRect& aFrameRect);
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void EndFrame();
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LexerResult ReadSingle(const uint8_t* aData, size_t aLength,
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const OrientedIntRect& aFrameRect);
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LexerResult ReadMultiple(WebPDemuxer* aDemuxer, bool aIsComplete);
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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
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/// received, if and only if the iterator is discontiguous.
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Vector<uint8_t> mBufferedData;
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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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/// Frame rect for the current frame.
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OrientedIntRect mFrameRect;
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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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/// Pointer to the start of the contiguous encoded image data.
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const uint8_t* mData;
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/// Length of data pointed to by mData.
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size_t mLength;
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/// True if the iterator has reached its end.
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bool mIteratorComplete;
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/// True if this decoding pass requires a WebPDemuxer.
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bool mNeedDemuxer;
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/// True if we have setup the color profile for the image.
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bool mGotColorProfile;
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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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