зеркало из https://github.com/mozilla/gecko-dev.git
96 строки
3.0 KiB
C++
96 строки
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_nsGIFDecoder2_h
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#define mozilla_image_decoders_nsGIFDecoder2_h
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#include "Decoder.h"
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#include "GIF2.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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//////////////////////////////////////////////////////////////////////
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// nsGIFDecoder2 Definition
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class nsGIFDecoder2 : public Decoder
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{
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public:
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~nsGIFDecoder2();
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virtual void WriteInternal(const char* aBuffer, uint32_t aCount) override;
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virtual void FinishInternal() override;
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virtual Telemetry::ID SpeedHistogram() 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 nsGIFDecoder2(RasterImage* aImage);
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/// Called when we begin decoding the image.
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void BeginGIF();
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/**
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* Called when we begin decoding a frame.
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*
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* @param aFrameRect The region of the image that contains data. The region
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* outside this rect is transparent.
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* @param aDepth The palette depth of this frame.
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* @param aIsInterlaced If true, this frame is an interlaced frame.
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*/
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nsresult BeginImageFrame(const gfx::IntRect& aFrameRect,
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uint16_t aDepth,
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bool aIsInterlaced);
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/// Called when we finish decoding a frame.
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void EndImageFrame();
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/// Called when we finish decoding the entire image.
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void FlushImageData();
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nsresult GifWrite(const uint8_t* buf, uint32_t numbytes);
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/// Transforms a palette index into a pixel.
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template <typename PixelSize> PixelSize
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ColormapIndexToPixel(uint8_t aIndex);
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/// A generator function that performs LZW decompression and yields pixels.
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template <typename PixelSize> NextPixel<PixelSize>
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YieldPixel(const uint8_t*& aCurrentByte);
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/// The entry point for LZW decompression.
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bool DoLzw(const uint8_t* aData);
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bool SetHold(const uint8_t* buf, uint32_t count,
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const uint8_t* buf2 = nullptr, uint32_t count2 = 0);
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bool CheckForTransparency(const gfx::IntRect& aFrameRect);
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gfx::IntRect ClampToImageRect(const gfx::IntRect& aFrameRect);
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inline int ClearCode() const { return 1 << mGIFStruct.datasize; }
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uint32_t mOldColor; // The old value of the transparent pixel
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// The frame number of the currently-decoding frame when we're in the middle
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// of decoding it, and -1 otherwise.
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int32_t mCurrentFrameIndex;
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uint8_t mColorMask; // Apply this to the pixel to keep within colormap
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bool mGIFOpen;
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bool mSawTransparency;
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gif_struct mGIFStruct;
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SurfacePipe mPipe; /// The SurfacePipe used to write to the output surface.
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};
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} // namespace image
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} // namespace mozilla
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#endif // mozilla_image_decoders_nsGIFDecoder2_h
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