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39 lines
1.3 KiB
39 lines
1.3 KiB
8 months ago
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/*
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* Copyright 2003, Sandro Giessl <ceebx@users.sourceforge.net>
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*
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* This library is free software; you can redistribute it and/or
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* modify it under the terms of the GNU Library General Public
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* License version 2 as published by the Free Software Foundation.
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*
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* This library 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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* Library General Public License for more details.
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*
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* You should have received a copy of the GNU Library General Public License
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* along with this library; see the file COPYING.LIB. If not, write to
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* the Free Software Foundation, Inc., 59 Temple Place - Suite 330,
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* Boston, MA 02111-1307, USA.
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*/
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#include <qcolor.h>
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#include "misc.h"
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QColor alphaBlendColors(const QColor &bgColor, const QColor &fgColor, const int a)
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{
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// normal button...
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QRgb rgb = bgColor.rgb();
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QRgb 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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QColor result = QColor( qRgb(qRed(rgb_b)*inv_alpha/255 + qRed(rgb)*alpha/255,
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qGreen(rgb_b)*inv_alpha/255 + qGreen(rgb)*alpha/255,
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qBlue(rgb_b)*inv_alpha/255 + qBlue(rgb)*alpha/255) );
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return result;
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}
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