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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_TRANSPARENCY_SURFACE_H
#define TITANIC_TRANSPARENCY_SURFACE_H
#include "common/rect.h"
#include "graphics/surface.h"
namespace Titanic {
enum TransparencyMode {
TRANS_MASK0 = 0, TRANS_MASK255 = 1, TRANS_ALPHA0 = 2,
TRANS_ALPHA255 = 3, TRANS_DEFAULT = 4
};
class CTransparencySurface {
private:
const Graphics::Surface *_surface;
Common::Point _pos;
int _pitch;
int _runLength;
bool _flag;
byte _transparentColor;
byte _opaqueColor;
private:
/**
* Returns a a pixel from the transparency surface
*/
inline uint getPixel() const {
byte pixel = *(const byte *)_surface->getBasePtr(_pos.x, _pos.y);
return pixel;
}
public:
/**
* Constructor
*/
CTransparencySurface(const Graphics::Surface *surface, TransparencyMode transMode);
/**
* Sets the row to get transparencies from
*/
inline void setRow(int yp) { _pos.y = yp; }
/**
* Sets the column to get transparencies from
*/
inline void setCol(int xp) { _pos.x = xp; }
/**
* Moves reading position horizontally by a single pixel
*/
inline int moveX() {
if (++_pos.x >= _surface->w) {
_pos.x = 0;
++_pos.y;
}
return 1;
}
/**
* Returns the alpha value for the pixel (0-31)
*/
inline uint getAlpha() const {
byte pixel = getPixel();
return _opaqueColor ? 0xFF - pixel : pixel;
}
/**
* Returns true if the pixel is opaque
*/
inline bool isPixelOpaque() const {
byte pixel = getPixel();
return _opaqueColor ? pixel >= 0xf0 : pixel < 0x10;
}
/**
* Returns true if the pixel is completely transparent
*/
inline bool isPixelTransparent() const {
byte pixel = getPixel();
return _transparentColor ? pixel >= 0xf0 : pixel < 0x10;
}
};
} // End of namespace Titanic
#endif /* TITANIC_TRANSPARENCY_SURFACE_H */
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