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/* Plastik KWin window decoration
Copyright (C) 2003 Sandro Giessl <ceebx@users.sourceforge.net>
based on the window decoration "Web":
Copyright (C) 2001 Rik Hemsley (rikkus) <rik@kde.org>
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; see the file COPYING. If not, write to
the Free Software Foundation, Inc., 51 Franklin Street, Fifth Floor,
Boston, MA 02110-1301, USA.
*/
#include <kpixmap.h>
#include <kpixmapeffect.h>
#include <tqcolor.h>
#include <tqimage.h>
#include <tqpainter.h>
#include "misc.h"
TQColor alphaBlendColors(const TQColor &bgColor, const TQColor &fgColor, const int a)
{
// normal button...
TQRgb rgb = bgColor.rgb();
TQRgb rgb_b = fgColor.rgb();
int alpha = a;
if(alpha>255) alpha = 255;
if(alpha<0) alpha = 0;
int inv_alpha = 255 - alpha;
TQColor result = TQColor( tqRgb(tqRed(rgb_b)*inv_alpha/255 + tqRed(rgb)*alpha/255,
tqGreen(rgb_b)*inv_alpha/255 + tqGreen(rgb)*alpha/255,
tqBlue(rgb_b)*inv_alpha/255 + tqBlue(rgb)*alpha/255) );
return result;
}
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