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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 SLUDGE_BACKDROP_H
#define SLUDGE_BACKDROP_H
#include "common/stream.h"
#include "graphics/surface.h"
#include "sludge/variable.h"
namespace Sludge {
/**
* parallax layers can scroll at different speeds
* to the background image, giving the illusion of
* depth to a scene as it moves.
*/
class Parallax {
public:
struct ParallaxLayer {
Graphics::Surface surface;
int speedX, speedY;
bool wrapS, wrapT;
uint16 fileNum, fractionX, fractionY;
int cameraX, cameraY;
};
typedef Common::List<ParallaxLayer *> ParallaxLayers;
Parallax();
~Parallax();
void kill();
bool add(uint16 v, uint16 fracX, uint16 fracY);
void save(Common::WriteStream *fp);
void draw();
private:
ParallaxLayers _parallaxLayers;
inline int sortOutPCamera(int cX, int fX, int sceneMax, int boxMax) {
return (fX == 65535) ? (sceneMax ? ((cX * boxMax) / sceneMax) : 0) : ((cX * fX) / 100);
}
};
} // End of namespace Sludge
#endif
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