xan.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_XAN_H
#define IMAGE_CODECS_XAN_H

#include "image/codecs/codec.h"

namespace Image {

class XanDecoder : public Codec {
public:
    XanDecoder (int width, int height, int bitsPerPixel);
    ~XanDecoder() 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:
    void decodeFrameType0(Common::SeekableReadStream &stream);
    void decodeFrameType1(Common::SeekableReadStream &stream);

    void decompressLuma(Common::SeekableReadStream &stream);

    bool decodeChroma(Common::SeekableReadStream &stream, int chroma_off);

    void convertYUVtoRGBSurface();

    Graphics::Surface *_surface;

    int _width, _height;

    Graphics::PixelFormat _pixelFormat;

    bool _wc4Mode;

    uint8 *_scratchbuf;
    uint8 *_lumabuf;
    uint8 *_ybuf;
    uint8 *_ubuf;
    uint8 *_vbuf;
};

} // End of namespace Image

#endif