Added smooth crossfade effect option when changing the desktop wallpaper.

1 files changed, 56 insertions, 0 deletions

diff --git a/kcontrol/background/crossfade.h b/kcontrol/background/crossfade.h
new file mode 100644
index 000000000..dba34a3b4
--- /dev/null
+++ b/kcontrol/background/crossfade.h
@@ -0,0 +1,56 @@
+/* vi: ts=8 sts=4 sw=4
+ * kate: space-indent on; tab-width 8; indent-width 4; indent-mode cstyle;
+ *
+ * This file is part of the KDE project, module kdesktop.
+ * Copyright (C) 1999,2000 Geert Jansen <jansen@kde.org>
+ *
+ * You can Freely distribute this program under the GNU General Public
+ * License. See the file "COPYING" for the exact licensing terms.
+ */
+
+#ifndef __CROSSFADE_H__
+#define __CROSSFADE_H__
+
+#include <tqtimer.h>
+#include <tqpainter.h>
+#include <tqpixmap.h>
+#include <X11/X.h>
+#include <X11/Xlib.h>
+#include <X11/Xatom.h>
+#include <X11/extensions/Xrender.h>
+#include <kdebug.h>
+#include <unistd.h>
+
+
+
+inline TQPixmap crossFade(const TQPixmap &pix1, const TQPixmap &pix2, double r_alpha,
+	                bool sync = false){
+
+    TQPixmap pix = TQPixmap(1,1,8); 
+    int mw,mh;
+    mw = pix1.width();
+    mh = pix1.height();
+
+    int alpha = 0xffff * (1-r_alpha);
+    
+    XRenderColor clr = { 0, 0, 0, alpha }; 
+    XRenderPictureAttributes pa;
+    pa.repeat = True;
+    Picture pic = XRenderCreatePicture(pix.x11Display(), pix.handle(),
+	    XRenderFindStandardFormat (pix.x11Display(), PictStandardA8),
+	    CPRepeat, &pa);
+    XRenderFillRectangle(pix.x11Display(), PictOpSrc, pic,
+			 &clr, 0, 0, 1, 1);
+    TQPixmap dst(pix1);
+    dst.detach();
+    XRenderComposite(pix.x11Display(), PictOpOver, pix2.x11RenderHandle(),
+	    pic, dst.x11RenderHandle(),0,0, 0,0, 0,0, mw,mh);
+
+    if (sync) {
+       XSync(pix.x11Display(), false);	
+    }
+    XRenderFreePicture(pix.x11Display(), pic);
+    return dst;
+}
+
+#endif // __CROSSFADE_H__