Copy the KDE 3.5 branch to branches/trinity for new KDE 3.5 features.

BUG:215923


git-svn-id: svn://anonsvn.kde.org/home/kde/branches/trinity/kdelibs@1054174 283d02a7-25f6-0310-bc7c-ecb5cbfe19da

1 files changed, 38 insertions, 0 deletions

diff --git a/kstyles/plastik/misc.cpp b/kstyles/plastik/misc.cpp
new file mode 100644
index 000000000..5eddf5ad2
--- /dev/null
+++ b/kstyles/plastik/misc.cpp
@@ -0,0 +1,38 @@
+/*
+ * Copyright 2003, Sandro Giessl <ceebx@users.sourceforge.net>
+ *
+ * This library is free software; you can redistribute it and/or
+ * modify it under the terms of the GNU Library General Public
+ * License version 2 as published by the Free Software Foundation.
+ *
+ * This library 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
+ * Library General Public License for more details.
+ *
+ * You should have received a copy of the GNU Library General Public License
+ * along with this library; see the file COPYING.LIB.  If not, write to
+ * the Free Software Foundation, Inc., 51 Franklin Street, Fifth Floor,
+ * Boston, MA 02110-1301, USA.
+ */
+
+#include <qcolor.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;
+}