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 contents of this file are subject to the Mozilla Public License Version
 * 1.1 (the "License"); you may not use this file except in compliance with
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 * License.
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 * The Original Code is mozilla.org code.
 *
 * The Initial Developer of the Original Code is
 * Netscape Communications Corporation.
 * Portions created by the Initial Developer are Copyright (C) 2001
 * the Initial Developer. All Rights Reserved.
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 * Contributor(s):
 *   Chris Saari <saari@netscape.com>
 *   Bobby Holley <bobbyholley@gmail.com>
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#ifndef _nsGIFDecoder2_h
#define _nsGIFDecoder2_h

#include "nsCOMPtr.h"
#include "imgIDecoder.h"
#include "imgIContainer.h"
#include "imgIDecoderObserver.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();

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

  void      BeginGIF();
  void      EndGIF(PRBool aSuccess);
  nsresult  BeginImageFrame(gfx_depth aDepth);
  void      EndImageFrame();
  nsresult  FlushImageData();
  nsresult  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<imgIDecoderObserver> mObserver;
  PRUint32 mFlags;
  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
  PRPackedBool mGIFOpen;
  PRPackedBool mSawTransparency;
  PRPackedBool mError;
  PRPackedBool mEnded;

  gif_struct mGIFStruct;
};

#endif