scummvm/video/codecs/truemotion1.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 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., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301, USA.
 *
 */

// Based on the TrueMotion 1 decoder by Alex Beregszaszi & Mike Melanson in FFmpeg

// Only compile if SCI32 is enabled or if we're building dynamic modules
#if defined(ENABLE_SCI32) || defined(DYNAMIC_MODULES)

#ifndef VIDEO_CODECS_TRUEMOTION1_H
#define VIDEO_CODECS_TRUEMOTION1_H

#include "video/codecs/codec.h"

namespace Video {

class TrueMotion1Decoder : public Codec {
public:
	TrueMotion1Decoder(uint16 width, uint16 height);
	~TrueMotion1Decoder();

	const Graphics::Surface *decodeImage(Common::SeekableReadStream *stream);

	// Always return RGB565
	Graphics::PixelFormat getPixelFormat() const { return Graphics::PixelFormat(2, 5, 6, 5, 0, 11, 5, 0, 0); }

private:
	Graphics::Surface *_surface;

	int _mbChangeBitsRowSize;
	byte *_buf, *_mbChangeBits, *_indexStream;
	int _indexStreamSize;

	uint16 _width, _height;
	int _flags;

	struct PredictorTableEntry {
		uint32 color;
		bool getNextIndex;
	};

	PredictorTableEntry _yPredictorTable[1024];
	PredictorTableEntry _cPredictorTable[1024];

	int _blockType;
	int _blockWidth;
	int _blockHeight;

	int16 _ydt[8];
	int16 _cdt[8];

	int _lastDeltaset, _lastVectable;

	uint32 *_vertPred;

	struct {
		byte headerSize;
		byte compression;
		byte deltaset;
		byte vectable;
		uint16 ysize;
		uint16 xsize;
		uint16 checksum;
		byte version;
		byte headerType;
		byte flags;
		byte control;
		uint16 xoffset;
		uint16 yoffset;
		uint16 width;
		uint16 height;
	} _header;

	void selectDeltaTables(int deltaTableIndex);
	void decodeHeader(Common::SeekableReadStream *stream);
	void decode16();
	int makeYdt16Entry(int p1, int p2);
	int makeCdt16Entry(int p1, int p2);
	void genVectorTable16(const byte *selVectorTable);
};

} // End of namespace Video

#endif // VIDEO_CODECS_TRUEMOTION1_H
#endif // SCI32/Plugins guard