Source/OpenEXR/IlmImf/ImfB44Compressor.h

///////////////////////////////////////////////////////////////////////////
//
// Copyright (c) 2006, Industrial Light & Magic, a division of Lucas
// Digital Ltd. LLC
// 
// All rights reserved.
// 
// Redistribution and use in source and binary forms, with or without
// modification, are permitted provided that the following conditions are
// met:
// *       Redistributions of source code must retain the above copyright
// notice, this list of conditions and the following disclaimer.
// *       Redistributions in binary form must reproduce the above
// copyright notice, this list of conditions and the following disclaimer
// in the documentation and/or other materials provided with the
// distribution.
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// its contributors may be used to endorse or promote products derived
// from this software without specific prior written permission. 
// 
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///////////////////////////////////////////////////////////////////////////


#ifndef INCLUDED_IMF_B44_COMPRESSOR_H
#define INCLUDED_IMF_B44_COMPRESSOR_H

//-----------------------------------------------------------------------------
//
//	class B44Compressor -- lossy compression of 4x4 pixel blocks
//
//-----------------------------------------------------------------------------

#include <ImfCompressor.h>

namespace Imf {

class ChannelList;


class B44Compressor: public Compressor
{
  public:

    B44Compressor (const Header &hdr,
                   int maxScanLineSize,
		   int numScanLines,
		   bool optFlatFields);

    virtual ~B44Compressor ();

    virtual int		numScanLines () const;

    virtual Format	format () const;

    virtual int		compress (const char *inPtr,
				  int inSize,
				  int minY,
				  const char *&outPtr);                  
                  
    virtual int		compressTile (const char *inPtr,
				      int inSize,
				      Imath::Box2i range,
				      const char *&outPtr);

    virtual int		uncompress (const char *inPtr,
				    int inSize,
				    int minY,
				    const char *&outPtr);
                    
    virtual int		uncompressTile (const char *inPtr,
					int inSize,
					Imath::Box2i range,
					const char *&outPtr);
  private:

    struct ChannelData;
    
    int			compress (const char *inPtr,
				  int inSize,
				  Imath::Box2i range,
				  const char *&outPtr);
 
    int			uncompress (const char *inPtr,
				    int inSize,
				    Imath::Box2i range,
				    const char *&outPtr);

    int			_maxScanLineSize;
    bool		_optFlatFields;
    Format		_format;
    int			_numScanLines;
    unsigned short *	_tmpBuffer;
    char *		_outBuffer;
    int			_numChans;
    const ChannelList &	_channels;
    ChannelData *	_channelData;
    int			_minX;
    int			_maxX;
    int			_maxY;
};


} // namespace Imf

#endif