1 files changed, 49 insertions, 0 deletions
diff --git a/src/kwin/misc.cpp b/src/kwin/misc.cpp
new file mode 100644
index 0000000..f050975
--- /dev/null
+++ b/src/kwin/misc.cpp
@@ -0,0 +1,49 @@
+/* Plastik KWin window decoration
+  Copyright (C) 2003 Sandro Giessl <[email protected]>
+
+  based on the window decoration "Web":
+  Copyright (C) 2001 Rik Hemsley (rikkus) <[email protected]>
+
+  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;
+}
+