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109 lines
2.6 KiB
C++
109 lines
2.6 KiB
C++
/* ScummVM - Graphic Adventure Engine
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*
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* ScummVM is the legal property of its developers, whose names
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* are too numerous to list here. Please refer to the COPYRIGHT
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* file distributed with this source distribution.
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*
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* This program is free software; you can redistribute it and/or
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* modify it under the terms of the GNU General Public License
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* as published by the Free Software Foundation; either version 2
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* of the License, or (at your option) any later version.
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*
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* This program is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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* GNU General Public License for more details.
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*
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* You should have received a copy of the GNU General Public License
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* along with this program; if not, write to the Free Software
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* Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301, USA.
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*
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*/
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#ifndef TITANIC_TRANSPARENCY_SURFACE_H
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#define TITANIC_TRANSPARENCY_SURFACE_H
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#include "common/rect.h"
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#include "graphics/surface.h"
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namespace Titanic {
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enum TransparencyMode {
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TRANS_MASK0 = 0, TRANS_MASK255 = 1, TRANS_ALPHA0 = 2,
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TRANS_ALPHA255 = 3, TRANS_DEFAULT = 4
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};
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class CTransparencySurface {
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private:
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const Graphics::Surface *_surface;
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Common::Point _pos;
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int _pitch;
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int _runLength;
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bool _flag;
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byte _transparentColor;
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byte _opaqueColor;
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private:
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/**
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* Returns a a pixel from the transparency surface
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*/
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inline uint getPixel() const {
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byte pixel = *(const byte *)_surface->getBasePtr(_pos.x, _pos.y);
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return pixel;
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}
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public:
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/**
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* Constructor
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*/
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CTransparencySurface(const Graphics::Surface *surface, TransparencyMode transMode);
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/**
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* Sets the row to get transparencies from
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*/
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inline void setRow(int yp) { _pos.y = yp; }
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/**
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* Sets the column to get transparencies from
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*/
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inline void setCol(int xp) { _pos.x = xp; }
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/**
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* Moves reading position horizontally by a single pixel
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*/
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inline int moveX() {
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if (++_pos.x >= _surface->w) {
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_pos.x = 0;
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++_pos.y;
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}
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return 1;
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}
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/**
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* Returns the alpha value for the pixel (0-31)
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*/
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inline uint getAlpha() const {
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byte pixel = getPixel();
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return _opaqueColor ? 0xFF - pixel : pixel;
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}
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/**
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* Returns true if the pixel is opaque
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*/
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inline bool isPixelOpaque() const {
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byte pixel = getPixel();
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return _opaqueColor ? pixel >= 0xf0 : pixel < 0x10;
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}
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/**
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* Returns true if the pixel is completely transparent
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*/
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inline bool isPixelTransparent() const {
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byte pixel = getPixel();
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return _transparentColor ? pixel >= 0xf0 : pixel < 0x10;
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}
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};
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} // End of namespace Titanic
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#endif /* TITANIC_TRANSPARENCY_SURFACE_H */
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