background.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 LASTEXPRESS_BACKGROUND_H
#define LASTEXPRESS_BACKGROUND_H

/*
    Background file format (.BG)

    header:
        uint32 {4}   - position X on screen
        uint32 {4}   - position Y on screen
        uint32 {4}   - image width
        uint32 {4}   - image height
        uint32 {4}   - red color channel data size
        uint32 {4}   - blue color channel data size
        uint32 {4}   - green color channel data size

    data:
        byte {x}     - red color channel data
        byte {x}     - blue color channel data
        byte {x}     - green color channel data
*/

#include "lastexpress/drawable.h"

namespace Common {
class SeekableReadStream;
}

namespace LastExpress {

class Background : public Drawable {
public:
    Background();
    ~Background() override;

    bool load(Common::SeekableReadStream *stream);

    Common::Rect draw(Graphics::Surface *surface) override;

private:
    struct BackgroundHeader {
        uint32 posX;       
        uint32 posY;       
        uint32 width;      
        uint32 height;     
        uint32 redSize;    
        uint32 blueSize;   
        uint32 greenSize;  
    };

    BackgroundHeader _header;
    uint16 *_data;         

    byte *decodeComponent(Common::SeekableReadStream *in, uint32 inSize, uint32 outSize) const;
};

} // End of namespace LastExpress

#endif // LASTEXPRESS_BACKGROUND_H