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50 lines
1.6 KiB
50 lines
1.6 KiB
/* Plastik KWin window decoration
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Copyright (C) 2003 Sandro Giessl <ceebx@users.sourceforge.net>
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based on the window decoration "Web":
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Copyright (C) 2001 Rik Hemsley (rikkus) <rik@kde.org>
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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
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License as published by the Free Software Foundation; either
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version 2 of the License, or (at your option) any later version.
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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 GNU
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General Public License for more details.
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You should have received a copy of the GNU General Public License
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along with this program; see the file COPYING. If not, write to
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the Free Software Foundation, Inc., 51 Franklin Street, Fifth Floor,
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Boston, MA 02110-1301, USA.
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*/
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#include <kpixmap.h>
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#include <kpixmapeffect.h>
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#include <tqcolor.h>
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#include <tqimage.h>
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#include <tqpainter.h>
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#include "misc.h"
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TQColor alphaBlendColors(const TQColor &bgColor, const TQColor &fgColor, const int a)
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{
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// normal button...
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TQRgb rgb = bgColor.rgb();
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TQRgb rgb_b = fgColor.rgb();
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int alpha = a;
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if(alpha>255) alpha = 255;
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if(alpha<0) alpha = 0;
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int inv_alpha = 255 - alpha;
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TQColor result = TQColor( tqRgb(tqRed(rgb_b)*inv_alpha/255 + tqRed(rgb)*alpha/255,
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tqGreen(rgb_b)*inv_alpha/255 + tqGreen(rgb)*alpha/255,
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tqBlue(rgb_b)*inv_alpha/255 + tqBlue(rgb)*alpha/255) );
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return result;
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}
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