gecko/modules/libpr0n/decoders/gif/nsGIFDecoder2.h

/* -*- Mode: C++; tab-width: 2; indent-tabs-mode: nil; c-basic-offset: 2 -*-
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 * The Original Code is mozilla.org code.
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 * Contributor(s):
 *   Chris Saari <saari@netscape.com>
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#ifndef _nsGIFDecoder2_h
#define _nsGIFDecoder2_h

#include "nsCOMPtr.h"
#include "imgIDecoder.h"
#include "imgIContainer.h"
#include "imgIDecoderObserver.h"
#include "gfxIImageFrame.h"

#include "GIF2.h"

#define NS_GIFDECODER2_CID \
{ /* 797bec5a-1dd2-11b2-a7f8-ca397e0179c4 */         \
     0x797bec5a,                                     \
     0x1dd2,                                         \
     0x11b2,                                         \
    {0xa7, 0xf8, 0xca, 0x39, 0x7e, 0x01, 0x79, 0xc4} \
}

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

class nsGIFDecoder2 : public imgIDecoder   
{
public:
  NS_DECL_ISUPPORTS
  NS_DECL_IMGIDECODER

  nsGIFDecoder2();
  ~nsGIFDecoder2();
  
  nsresult ProcessData(unsigned char *data, PRUint32 count, PRUint32 *_retval);

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

  void      BeginGIF();
  void      EndGIF();
  void      BeginImageFrame();
  void      EndImageFrame();
  void      FlushImageData();
  void      FlushImageData(PRUint32 fromRow, PRUint32 rows);

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

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

  nsCOMPtr<imgIContainer> mImageContainer;
  nsCOMPtr<gfxIImageFrame> mImageFrame;
  nsCOMPtr<imgIDecoderObserver> mObserver; // this is just qi'd from mRequest for speed
  PRInt32 mCurrentRow;
  PRInt32 mLastFlushedRow;

  PRUint32 *mImageData;      // Pointer to image data in Cairo format
  PRUint32 *mColormap;       // Current colormap to be used in Cairo format
  PRUint32 mOldColor;        // The old value of the transparent pixel
  PRUint8 mCurrentPass;
  PRUint8 mLastFlushedPass;
  PRPackedBool mGIFOpen;

  gif_struct mGIFStruct;
};

#endif