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Rootless X Server based on DirectFB
XDirectFB is a rootless X Server using DirectFB windows for X11 toplevel windows. This way you can adjust the opacity of every application with your mouse wheel (while holding Meta down over a window). More details about these shortcuts can be found in the DirectFB README.
Window movements are initiated by the applications or the window manager. The graphical movement is done by DirectFB using available hardware acceleration.
Overlapping toplevel windows do not cause expose events, i.e. redrawing of the window contents, as they are DirectFB windows and therefore have an own surface, a.k.a. backing store.
You should use the CVS version, because the last release is too old.