indeo4.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/>.
 *
 */

/* Intel Indeo 4 decompressor, derived from ffmpeg.
 *
 * Original copyright note:
 * Intel Indeo 4 (IV31, IV32, etc.) video decoder for ffmpeg
 * written, produced, and directed by Alan Smithee
 */

#ifndef IMAGE_CODECS_INDEO4_H
#define IMAGE_CODECS_INDEO4_H

#include "image/codecs/indeo/get_bits.h"
#include "image/codecs/indeo/indeo.h"

namespace Image {

using namespace Indeo;

class Indeo4Decoder : public IndeoDecoderBase {
    struct Transform {
        InvTransformPtr *_invTrans;
        DCTransformPtr *_dcTrans;
        bool _is2dTrans;
    };
public:
    Indeo4Decoder(uint16 width, uint16 height, uint bitsPerPixel = 16);
    ~Indeo4Decoder() override {}

    const Graphics::Surface *decodeFrame(Common::SeekableReadStream &stream) override;

    static bool isIndeo4(Common::SeekableReadStream &stream);
protected:
    int decodePictureHeader() override;

    void switchBuffers() override;

    bool isNonNullFrame() const override;

    int decodeBandHeader(IVIBandDesc *band) override;

    int decodeMbInfo(IVIBandDesc *band, IVITile *tile) override;

    int decodeRLETransparency(VLC_TYPE (*table)[2]);

    int decodeTransparency() override;
private:
    int scaleTileSize(int defSize, int sizeFactor);

    int decodePlaneSubdivision();

private:
    static const uint _ivi4_common_pic_sizes[14];

    static const Transform _transforms[18];

    static const uint8 *const _scan_index_to_tab[15];

    static const uint16 _ivi4_quant_8x8_intra[9][64];

    static const uint16 _ivi4_quant_8x8_inter[9][64];

    static const uint16 _ivi4_quant_4x4_intra[5][16];

    static const uint16 _ivi4_quant_4x4_inter[5][16];

    static const uint8 _quant_index_to_tab[22];
};

} // End of namespace Image

#endif