/* 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 <qcolor.h>
#include <qimage.h>
#include <qpainter.h>

#include "misc.h"

QColor alphaBlendColors(const QColor &bgColor, const QColor &fgColor, const int a)
{

    // normal button...
    QRgb rgb = bgColor.rgb();
    QRgb rgb_b = fgColor.rgb();
    int alpha = a;
    if(alpha>255) alpha = 255;
    if(alpha<0) alpha = 0;
    int inv_alpha = 255 - alpha;

    QColor result  = QColor( qRgb(qRed(rgb_b)*inv_alpha/255 + qRed(rgb)*alpha/255,
                                  qGreen(rgb_b)*inv_alpha/255 + qGreen(rgb)*alpha/255,
                                  qBlue(rgb_b)*inv_alpha/255 + qBlue(rgb)*alpha/255) );

    return result;
}