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Diffstat (limited to 'engines/titanic/support/transparency_surface.h')
-rw-r--r-- | engines/titanic/support/transparency_surface.h | 84 |
1 files changed, 84 insertions, 0 deletions
diff --git a/engines/titanic/support/transparency_surface.h b/engines/titanic/support/transparency_surface.h new file mode 100644 index 0000000000..0391b6d5b7 --- /dev/null +++ b/engines/titanic/support/transparency_surface.h @@ -0,0 +1,84 @@ +/* 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; + bool _flag1; + bool _flag2; +public: + /** + * Constructor + */ + CTransparencySurface(const Graphics::Surface *surface, TransparencyMode transMode); + + /** + * Sets the row to get transparencies from + */ + void setRow(int yp) { _pos.y = yp; } + + /** + * Sets the column to get transparencies from + */ + void setCol(int xp) { _pos.x = xp; } + + /** + * Moves reading position horizontally by a single pixel + */ + int moveX(); + + /** + * Returns a byte from the transparency surface + */ + uint getPixel() const; + + /** + * Returns the alpha value for the pixel (0-31) + */ + uint getAlpha() const { return 31 - (getPixel() >> 3); } + + /** + * Returns true if the pixel is completely transparent + */ + bool isPixelTransparent() const { return getAlpha() == 31; } +}; + +} // End of namespace Titanic + +#endif /* TITANIC_TRANSPARENCY_SURFACE_H */ |