surface_fader.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 TITANIC_SURFACE_FADER_H
#define TITANIC_SURFACE_FADER_H

#include "common/scummsys.h"

namespace Titanic {

class CVideoSurface;
class CScreenManager;
class CSurfaceArea;

class CSurfaceFader {
private:
    byte *_dataP;
    bool _fadeIn;
private:
    void step(CSurfaceArea &srcSurface, CSurfaceArea &destSurface);

    bool setupSurface(CScreenManager *screenManager, CVideoSurface *srcSurface);
public:
    int _index;
    int _count;
    CVideoSurface *_videoSurface;
public:
    CSurfaceFader();
    ~CSurfaceFader();

    void reset();

    CVideoSurface *draw(CScreenManager *screenManager, CVideoSurface *srcSurface);

    void setFadeIn(bool fadeIn);

    bool isActive() const { return _index >= 0 && _index < _count; }
};

} // End of namespace Titanic

#endif /* TITANIC_SURFACE_SHADER_H */