gecko/modules/libpr0n/decoders/nsGIFDecoder2.h

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/* -*- 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>
* Bobby Holley <bobbyholley@gmail.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
* of those above. If you wish to allow use of your version of this file only
* under the terms of either the GPL or the LGPL, and not to allow others to
* use your version of this file under the terms of the MPL, indicate your
* decision by deleting the provisions above and replace them with the notice
* and other provisions required by the GPL or the LGPL. If you do not delete
* the provisions above, a recipient may use your version of this file under
* the terms of any one of the MPL, the GPL or the LGPL.
*
* ***** END LICENSE BLOCK ***** */
#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();
~nsGIFDecoder2();
virtual void WriteInternal(const char* aBuffer, PRUint32 aCount);
virtual void FinishInternal();
private:
/* These functions will be called when the decoder has a decoded row,
* frame size information, etc. */
void BeginGIF();
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nsresult BeginImageFrame(gfx_depth aDepth);
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; }
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;
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PRUint8 mColorMask; // Apply this to the pixel to keep within colormap
PRPackedBool mGIFOpen;
PRPackedBool mSawTransparency;
gif_struct mGIFStruct;
};
} // namespace imagelib
} // namespace mozilla
#endif