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/* ScummVM - Scumm Interpreter
* Copyright (C) 2001/2002 The ScummVM project
*
* This program is free software; you can redistribute it and/or
* modify it under the terms of the GNU General Public License
* as published by the Free Software Foundation; either version 2
* of the License, or (at your option) any later version.
* This program is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
* GNU General Public License for more details.
* You should have received a copy of the GNU General Public License
* along with this program; if not, write to the Free Software
* Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA.
*
* $Header$
*
*/
#ifndef CODEC37_H
#define CODEC37_H
#include "config.h"
#ifdef DEBUG
# ifndef NO_DEBUG_CODEC37
# define DEBUG_CODEC37
# endif
#else
# ifdef DEBUG_CODEC37
# error DEBUG_CODEC37 defined without DEBUG
# endif
#endif
#ifdef DEBUG_CODEC37
# ifndef NO_DEBUG_CODEC37_PROCS
# define DEBUG_CODEC37_PROC1
# define DEBUG_CODEC37_PROC2
# define DEBUG_CODEC37_PROC3
# define DEBUG_CODEC37_PROC4
# endif
#endif
#include "decoder.h"
/*! @brief ::decoder for codec 37.
*/
#define DELTA_ADD 0x3E00 // what is this 0x3E00 ?? == 320*200/4 - 128
// It looks like it is a safe-guarding protection from bugs., but maybe not...
class Codec37Decoder : public Decoder {
private:
int32 _deltaSize;
byte * _deltaBufs[2];
byte * _deltaBuf;
int16 * _offsetTable;
int32 _curtable;
uint16 _prevSeqNb;
int32 _tableLastPitch;
int32 _tableLastIndex;
public:
bool initSize(const Point &, const Rect &);
Codec37Decoder();
void clean();
virtual ~Codec37Decoder();
protected:
static inline uint32 expand(byte b) {
uint32 r = b | (b << 8);
return r | (r << 16);
}
void maketable(int32, int32);
void proc1(Blitter &, Chunk &, int32, int32, int32, int32);
void proc2(Blitter &, Chunk &, int32);
void proc3WithFDFE(Blitter &, Chunk &, int32, int32, int32);
void proc3WithoutFDFE(Blitter &, Chunk &, int32, int32, int32);
void proc4(Blitter &, Chunk &, int32, int32, int32);
public:
bool decode(Blitter &, Chunk &);
};
#endif
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