indeo3.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/>.
 *
 */

#include "common/scummsys.h"

/* Intel Indeo 3 decompressor, derived from ffmpeg.
 *
 * Original copyright note:
 * Intel Indeo 3 (IV31, IV32, etc.) video decoder for ffmpeg
 * written, produced, and directed by Alan Smithee
 */

#ifndef IMAGE_CODECS_INDEO3_H
#define IMAGE_CODECS_INDEO3_H

#include "image/codecs/codec.h"

namespace Image {

class Indeo3Decoder : public Codec {
public:
    Indeo3Decoder(uint16 width, uint16 height, uint bitsPerPixel = 24);
    ~Indeo3Decoder() override;

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

    static bool isIndeo3(Common::SeekableReadStream &stream);

private:
    Graphics::Surface *_surface;

    uint16 _width;
    uint16 _height;
    Graphics::PixelFormat _pixelFormat;

    static const byte _corrector_type_0[24];
    static const byte _corrector_type_2[8];
    static const uint32 correction[];
    static const uint32 correctionloworder[];
    static const uint32 correctionhighorder[];

    struct YUVBufs {
        byte *Ybuf;
        byte *Ubuf;
        byte *Vbuf;
        byte *the_buf;
        uint32 the_buf_size;
        uint16 y_w, y_h;
        uint16 uv_w, uv_h;
    };

    YUVBufs _iv_frame[2];
    YUVBufs *_cur_frame;
    YUVBufs *_ref_frame;

    byte *_ModPred;
    byte *_corrector_type;

    void buildModPred();
    void allocFrames();

    void decodeChunk(byte *cur, byte *ref, int width, int height,
            const byte *buf1, uint32 fflags2, const byte *hdr,
            const byte *buf2, int min_width_160);
};

} // End of namespace Image

#endif