backbuffer.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/>.
 *
 *
 * This file is dual-licensed.
 * In addition to the GPLv3 license mentioned above, this code is also
 * licensed under LGPL 2.1. See LICENSES/COPYING.LGPL file for the
 * full text of the license.
 *
 */

#ifndef GOB_BACKBUFFER_H
#define GOB_BACKBUFFER_H

#include "common/system.h"

namespace Gob {

class Surface;

class BackBuffer {
public:
    BackBuffer();
    ~BackBuffer();

protected:
    void trashBuffer();
    void resizeBuffer(uint16 width, uint16 height);

    bool saveScreen   (const Surface &dest, int16 &left, int16 &top, int16 &right, int16 &bottom);
    bool restoreScreen(      Surface &dest, int16 &left, int16 &top, int16 &right, int16 &bottom);

    bool hasBuffer() const;
    bool hasSavedBackground() const;

private:
    Surface *_background; 
    bool _saved;          

    int16 _saveLeft;   
    int16 _saveTop;    
    int16 _saveRight;  
    int16 _saveBottom; 
};

} // End of namespace Gob

#endif // GOB_BACKBUFFER_H