gecko-dev/image/decoders/nsGIFDecoder2.h

73 lines
2.0 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 nsGIFDecoder2_h
#define nsGIFDecoder2_h
#include "Decoder.h"
#include "GIF2.h"
#include "nsCOMPtr.h"
namespace mozilla {
namespace image {
class RasterImage;
//////////////////////////////////////////////////////////////////////
// nsGIFDecoder2 Definition
class nsGIFDecoder2 : public Decoder
{
public:
explicit nsGIFDecoder2(RasterImage* aImage);
~nsGIFDecoder2();
virtual void WriteInternal(const char* aBuffer, uint32_t aCount) MOZ_OVERRIDE;
virtual void FinishInternal() MOZ_OVERRIDE;
virtual Telemetry::ID SpeedHistogram() MOZ_OVERRIDE;
private:
// These functions will be called when the decoder has a decoded row,
// frame size information, etc.
void BeginGIF();
void BeginImageFrame(uint16_t aDepth);
void EndImageFrame();
void FlushImageData();
void FlushImageData(uint32_t fromRow, uint32_t rows);
nsresult GifWrite(const uint8_t* buf, uint32_t numbytes);
uint32_t OutputRow();
bool DoLzw(const uint8_t* q);
bool SetHold(const uint8_t* buf, uint32_t count,
const uint8_t* buf2 = nullptr, uint32_t count2 = 0);
inline int ClearCode() const { return 1 << mGIFStruct.datasize; }
int32_t mCurrentRow;
int32_t mLastFlushedRow;
uint32_t mOldColor; // The old value of the transparent pixel
// The frame number of the currently-decoding frame when we're in the middle
// of decoding it, and -1 otherwise.
int32_t mCurrentFrameIndex;
uint8_t mCurrentPass;
uint8_t mLastFlushedPass;
uint8_t mColorMask; // Apply this to the pixel to keep within colormap
bool mGIFOpen;
bool mSawTransparency;
gif_struct mGIFStruct;
};
} // namespace image
} // namespace mozilla
#endif // nsGIFDecoder2_h