зеркало из https://github.com/mozilla/gecko-dev.git
112 строки
3.2 KiB
C++
112 строки
3.2 KiB
C++
/* -*- 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 final : public Decoder {
|
|
public:
|
|
virtual ~nsWebPDecoder();
|
|
|
|
DecoderType GetType() const override { return DecoderType::WEBP; }
|
|
|
|
protected:
|
|
LexerResult DoDecode(SourceBufferIterator& aIterator,
|
|
IResumable* aOnResume) override;
|
|
Maybe<Telemetry::HistogramID> SpeedHistogram() const override;
|
|
|
|
private:
|
|
friend class DecoderFactory;
|
|
|
|
// Decoders should only be instantiated via DecoderFactory.
|
|
explicit nsWebPDecoder(RasterImage* aImage);
|
|
|
|
void ApplyColorProfile(const char* aProfile, size_t aLength);
|
|
|
|
LexerResult UpdateBuffer(SourceBufferIterator& aIterator,
|
|
SourceBufferIterator::State aState);
|
|
LexerResult ReadData();
|
|
LexerResult ReadHeader(WebPDemuxer* aDemuxer, bool aIsComplete);
|
|
LexerResult ReadPayload(WebPDemuxer* aDemuxer, bool aIsComplete);
|
|
|
|
nsresult CreateFrame(const nsIntRect& aFrameRect);
|
|
void EndFrame();
|
|
|
|
LexerResult ReadSingle(const uint8_t* aData, size_t aLength,
|
|
const IntRect& aFrameRect);
|
|
|
|
LexerResult ReadMultiple(WebPDemuxer* aDemuxer, bool aIsComplete);
|
|
|
|
/// The SurfacePipe used to write to the output surface.
|
|
SurfacePipe mPipe;
|
|
|
|
/// The buffer used to accumulate data until the complete WebP header is
|
|
/// received, if and only if the iterator is discontiguous.
|
|
Vector<uint8_t> mBufferedData;
|
|
|
|
/// 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;
|
|
|
|
/// Frame rect for the current frame.
|
|
IntRect mFrameRect;
|
|
|
|
/// The last row of decoded pixels written to mPipe.
|
|
int mLastRow;
|
|
|
|
/// Number of decoded frames.
|
|
uint32_t mCurrentFrame;
|
|
|
|
/// Pointer to the start of the contiguous encoded image data.
|
|
const uint8_t* mData;
|
|
|
|
/// Length of data pointed to by mData.
|
|
size_t mLength;
|
|
|
|
/// True if the iterator has reached its end.
|
|
bool mIteratorComplete;
|
|
|
|
/// True if this decoding pass requires a WebPDemuxer.
|
|
bool mNeedDemuxer;
|
|
|
|
/// True if we have setup the color profile for the image.
|
|
bool mGotColorProfile;
|
|
|
|
/// Color management profile from the ICCP chunk in the image.
|
|
qcms_profile* mInProfile;
|
|
|
|
/// Color management transform to apply to image data.
|
|
qcms_transform* mTransform;
|
|
};
|
|
|
|
} // namespace image
|
|
} // namespace mozilla
|
|
|
|
#endif // mozilla_image_decoders_nsWebPDecoder_h
|