seq_decoder.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 SCI_VIDEO_SEQ_DECODER_H
#define SCI_VIDEO_SEQ_DECODER_H

#include "common/rational.h"
#include "graphics/pixelformat.h"
#include "video/video_decoder.h"

namespace Common {
class SeekableReadStream;
}

namespace Graphics {
struct Surface;
}

namespace Sci {

class SEQDecoder : public Video::VideoDecoder {
public:
    SEQDecoder(uint frameDelay);
    ~SEQDecoder() override;

    bool loadStream(Common::SeekableReadStream *stream) override;

private:
    class SEQVideoTrack : public FixedRateVideoTrack {
    public:
        SEQVideoTrack(Common::SeekableReadStream *stream, uint frameDelay);
        ~SEQVideoTrack() override;

        uint16 getWidth() const override { return SEQ_SCREEN_WIDTH; }
        uint16 getHeight() const override { return SEQ_SCREEN_HEIGHT; }
        Graphics::PixelFormat getPixelFormat() const override { return Graphics::PixelFormat::createFormatCLUT8(); }
        int getCurFrame() const override { return _curFrame; }
        int getFrameCount() const override { return _frameCount; }
        const Graphics::Surface *decodeNextFrame() override;
        const byte *getPalette() const override;
        bool hasDirtyPalette() const override { return _dirtyPalette; }

    protected:
        Common::Rational getFrameRate() const override { return Common::Rational(60, _frameDelay); }

    private:
        enum {
            SEQ_SCREEN_WIDTH = 320,
            SEQ_SCREEN_HEIGHT = 200
        };

        void readPaletteChunk(uint16 chunkSize);
        bool decodeFrame(byte *rleData, int rleSize, byte *litData, int litSize, byte *dest, int left, int width, int height, int colorKey);

        Common::SeekableReadStream *_fileStream;
        int _curFrame, _frameCount;
        byte _palette[256 * 3];
        mutable bool _dirtyPalette;
        Graphics::Surface *_surface;
        uint _frameDelay;
    };

    uint _frameDelay;
};

} // End of namespace Sci

#endif // SCI_VIDEO_SEQ_DECODER_H