codec48.h

/* ScummVM - Graphic Adventure Engine
 *
 * ScummVM is the legal property of its developers, whose names
 * are too numerous to list here. Please refer to the COPYRIGHT
 * file distributed with this source distribution.
 *
 * 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 3 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, see <http://www.gnu.org/licenses/>.
 *
 */
 
#ifndef CODEC48_H
#define CODEC48_H
 
#include "common/scummsys.h"
 
namespace Grim {
 
class Codec48Decoder {
public:
    Codec48Decoder();
    ~Codec48Decoder();
    void init(int width, int height);
    void deinit();
    bool decode(byte *dst, const byte *src);
 
private:
    void makeTable(int pitch, int index);
 
    void bompDecodeLine(byte *dst, const byte *src, int len);
 
    void decode3(byte *dst, const byte *src, int bufOffset);
    void scaleBlock(byte *dst, const byte *src);
    void copyBlock(byte *dst, int deltaBufOffset, int offset);
 
    int _curBuf;
    byte *_deltaBuf[2];
    int _blockX, _blockY;
    int _pitch;
    int16 *_offsetTable;
    int _tableLastPitch, _tableLastIndex;
    int16 _prevSeqNb;
    int32 _frameSize;
    int _width, _height;
    byte *_interTable;
};
 
} // end of namespace Grim
 
#endif