/* -*- Mode: C++; tab-width: 2; indent-tabs-mode: nil; c-basic-offset: 2 -*-
 *
 * ***** BEGIN LICENSE BLOCK *****
 * Version: MPL 1.1/GPL 2.0/LGPL 2.1
 *
 * 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
 * the License. You may obtain a copy of the License at
 * http://www.mozilla.org/MPL/
 *
 * Software distributed under the License is distributed on an "AS IS" basis,
 * WITHOUT WARRANTY OF ANY KIND, either express or implied. See the License
 * for the specific language governing rights and limitations under the
 * License.
 *
 * 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.
 *
 * Contributor(s):
 *   Chris Saari <saari@netscape.com>
 *
 * Alternatively, the contents of this file may be used under the terms of
 * either the GNU General Public License Version 2 or later (the "GPL"), or
 * the GNU Lesser General Public License Version 2.1 or later (the "LGPL"),
 * in which case the provisions of the GPL or the LGPL are applicable instead
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 * ***** END LICENSE BLOCK ***** */

#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(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<gfxIImageFrame> mImageFrame;
  nsCOMPtr<imgIDecoderObserver> mObserver; // this is just qi'd from mRequest for speed
  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 mOldColor;        // The old value of the transparent pixel
  PRUint8 mCurrentPass;
  PRUint8 mLastFlushedPass;
  PRUint8 mColorMask;        // Apply this to the pixel to keep within colormap
  PRPackedBool mGIFOpen;
  PRPackedBool mSawTransparency;

  gif_struct mGIFStruct;
};

#endif
