svq1.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 IMAGE_CODECS_SVQ1_H
#define IMAGE_CODECS_SVQ1_H

#include "common/scummsys.h"

#include "common/bitstream.h"
#include "image/codecs/codec.h"

namespace Common {
template <class BITSTREAM>
class Huffman;
struct Point;
}

namespace Image {

class SVQ1Decoder : public Codec {
public:
    SVQ1Decoder(uint16 width, uint16 height);
    ~SVQ1Decoder() override;

    const Graphics::Surface *decodeFrame(Common::SeekableReadStream &stream) override;
    Graphics::PixelFormat getPixelFormat() const override { return _pixelFormat; }
    bool setOutputPixelFormat(const Graphics::PixelFormat &format) override {
        if (format.bytesPerPixel != 2 && format.bytesPerPixel != 4)
            return false;
        _pixelFormat = format;
        return true;
    }

private:
    Graphics::PixelFormat _pixelFormat;
    Graphics::Surface *_surface;
    uint16 _width, _height;
    uint16 _frameWidth, _frameHeight;

    byte *_last[3];

    typedef Common::Huffman<Common::BitStream32BEMSB> HuffmanDecoder;

    HuffmanDecoder *_blockType;
    HuffmanDecoder *_intraMultistage[6];
    HuffmanDecoder *_interMultistage[6];
    HuffmanDecoder *_intraMean;
    HuffmanDecoder *_interMean;
    HuffmanDecoder *_motionComponent;

    bool svq1DecodeBlockIntra(Common::BitStream32BEMSB *s, byte *pixels, int pitch);
    bool svq1DecodeBlockNonIntra(Common::BitStream32BEMSB *s, byte *pixels, int pitch);
    bool svq1DecodeMotionVector(Common::BitStream32BEMSB *s, Common::Point *mv, Common::Point **pmv);
    void svq1SkipBlock(byte *current, byte *previous, int pitch, int x, int y);
    bool svq1MotionInterBlock(Common::BitStream32BEMSB *ss, byte *current, byte *previous, int pitch,
            Common::Point *motion, int x, int y);
    bool svq1MotionInter4vBlock(Common::BitStream32BEMSB *ss, byte *current, byte *previous, int pitch,
            Common::Point *motion, int x, int y);
    bool svq1DecodeDeltaBlock(Common::BitStream32BEMSB *ss, byte *current, byte *previous, int pitch,
            Common::Point *motion, int x, int y);

    void putPixels8C(byte *block, const byte *pixels, int lineSize, int h);
    void putPixels8L2(byte *dst, const byte *src1, const byte *src2, int dstStride, int srcStride1, int srcStride2, int h);
    void putPixels8X2C(byte *block, const byte *pixels, int lineSize, int h);
    void putPixels8Y2C(byte *block, const byte *pixels, int lineSize, int h);
    void putPixels8XY2C(byte *block, const byte *pixels, int lineSize, int h);
    void putPixels16C(byte *block, const byte *pixels, int lineSize, int h);
    void putPixels16X2C(byte *block, const byte *pixels, int lineSize, int h);
    void putPixels16Y2C(byte *block, const byte *pixels, int lineSize, int h);
    void putPixels16XY2C(byte *block, const byte *pixels, int lineSize, int h);
};

} // End of namespace Image

#endif