modules/libpr0n/decoders/nsGIFDecoder2.h
author David Anderson <danderson@mozilla.com>
Wed, 05 Oct 2011 19:52:55 -0700
changeset 105229 8cfeba5239a9e4f20c462d6fb20421b4e4e7c735
parent 77799 e7854b4d29ba905ae3994f821b160c989bac4260
parent 105226 cad26d2fb5af799dfe030fd2a8948d617eac2f52
permissions -rw-r--r--
Merge to eliminate bad head.

/* -*- Mode: C++; tab-width: 2; indent-tabs-mode: nil; c-basic-offset: 2 -*-
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 *   Bobby Holley <bobbyholley@gmail.com>
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#ifndef _nsGIFDecoder2_h
#define _nsGIFDecoder2_h

#include "nsCOMPtr.h"
#include "Decoder.h"
#include "imgIDecoderObserver.h"

#include "GIF2.h"

namespace mozilla {
namespace imagelib {
class RasterImage;

//////////////////////////////////////////////////////////////////////
// nsGIFDecoder2 Definition

class nsGIFDecoder2 : public Decoder
{
public:

  nsGIFDecoder2(RasterImage *aImage, imgIDecoderObserver* aObserver);
  ~nsGIFDecoder2();

  virtual void WriteInternal(const char* aBuffer, PRUint32 aCount);
  virtual void FinishInternal();
  virtual Telemetry::ID SpeedHistogram();

private:
  /* These functions will be called when the decoder has a decoded row,
   * frame size information, etc. */

  void      BeginGIF();
  nsresult  BeginImageFrame(PRUint16 aDepth);
  void      EndImageFrame();
  void      FlushImageData();
  void      FlushImageData(PRUint32 fromRow, PRUint32 rows);

  nsresult  GifWrite(const PRUint8 * buf, PRUint32 numbytes);
  PRUint32  OutputRow();
  bool      DoLzw(const PRUint8 *q);

  inline int ClearCode() const { return 1 << mGIFStruct.datasize; }

  PRInt32 mCurrentRow;
  PRInt32 mLastFlushedRow;

  PRUint8 *mImageData;       // Pointer to image data in either Cairo or 8bit format
  PRUint32 *mColormap;       // Current colormap to be used in Cairo format
  PRUint32 mColormapSize;
  PRUint32 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.
  PRInt32 mCurrentFrame;

  PRUint8 mCurrentPass;
  PRUint8 mLastFlushedPass;
  PRUint8 mColorMask;        // Apply this to the pixel to keep within colormap
  bool mGIFOpen;
  bool mSawTransparency;

  gif_struct mGIFStruct;
};

} // namespace imagelib
} // namespace mozilla

#endif