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84 lines
2.4 KiB
C++
84 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_nsGIFDecoder2_h
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#define mozilla_image_decoders_nsGIFDecoder2_h
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#include "Decoder.h"
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#include "Downscaler.h"
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#include "GIF2.h"
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#include "nsCOMPtr.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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nsresult SetTargetSize(const nsIntSize& aSize) override;
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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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uint8_t* GetCurrentRowBuffer();
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uint8_t* GetRowBuffer(uint32_t aRow);
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// These functions will be called when the decoder has a decoded row,
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// frame size information, etc.
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void BeginGIF();
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nsresult BeginImageFrame(uint16_t aDepth);
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void EndImageFrame();
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void FlushImageData();
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void FlushImageData(uint32_t fromRow, uint32_t rows);
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nsresult GifWrite(const uint8_t* buf, uint32_t numbytes);
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uint32_t OutputRow();
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bool DoLzw(const uint8_t* q);
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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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void CheckForTransparency(gfx::IntRect aFrameRect);
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inline int ClearCode() const { return 1 << mGIFStruct.datasize; }
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int32_t mCurrentRow;
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int32_t mLastFlushedRow;
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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 mCurrentPass;
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uint8_t mLastFlushedPass;
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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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Maybe<Downscaler> mDownscaler;
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Maybe<Deinterlacer> mDeinterlacer;
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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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