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/* 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 2
* 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, write to the Free Software
* Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301, USA.
*
*/
#ifndef TITANIC_SURFACE_FADER_H
#define TITANIC_SURFACE_FADER_H
#include "common/scummsys.h" // typedef for byte
namespace Titanic {
class CVideoSurface;
class CScreenManager;
class CSurfaceArea;
class CSurfaceFader {
private:
byte *_dataP;
bool _fadeIn;
private:
/**
* Create a faded version of the source surface for the new step
*/
void step(CSurfaceArea &srcSurface, CSurfaceArea &destSurface);
/**
* Sets up an internal surface to match the size of the specified one
*/
bool setupSurface(CScreenManager *screenManager, CVideoSurface *srcSurface);
public:
int _index;
int _count;
CVideoSurface *_videoSurface;
public:
CSurfaceFader();
~CSurfaceFader();
/**
* Reset fading back to the start
*/
void reset();
/**
* Creates a faded version of the passed source surface, based on a percentage
* visibility specified by _index of _count
*/
CVideoSurface *draw(CScreenManager *screenManager, CVideoSurface *srcSurface);
/**
* Sets whether a fade in (versus a fade out) should be done
*/
void setFadeIn(bool fadeIn);
/**
* Returns true if a fade is in progress
*/
bool isActive() const { return _index >= 0 && _index < _count; }
};
} // End of namespace Titanic
#endif /* TITANIC_SURFACE_SHADER_H */
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