Input issues with CompositeOverlayWindow

Rémi Cardona remi at
Fri Nov 23 06:44:15 PST 2007

Kalle Vahlman a écrit :
> 2007/11/22, Rémi Cardona <remi at>:
>> I'm trying to use the CompositeOverlayWindow to render stuff but I can't
>> get any input from it. All the clicks and keyboard events go right
>> through the overlay directly to the underlying windows. The same code
>> behaves as expected if I use XCreateSimpleWindow.
> FWIW, I had the exact opposite experience just now. I didn't realize
> that the overlay is getting the input and was baffled why clicking  on
> anything didn't work... For me, the fix was:
>  XShapeCombineShape(my->display,
>                      my->composite_overlay, ShapeInput, 0, 0,
>                      my->composite_overlay, ShapeInput, ShapeInvert);
> Maybe you could try that to determine if it is a bug in the server or
> just that some client code empties the input shape?

Here's what I used to fix the mouse input :

XRectangle rect = { 0, 0, DisplayWidth (dpy, 0), DisplayHeight (dpy, 0) };
XShapeCombineRectangles(dpy, overlay, ShapeInput, 0, 0, &rect, 1, 
ShapeUnion, Unsorted);

I'm sure there must be a better way to do that, but that works.

And that fixed the key press input :

XSetInputFocus (dpy, overlay, RevertToNone, CurrentTime);

> I'm using xephyr from a 1.1.1 server sources (apparently, debian etch
> package) for testing.

FWIW, I develop on a live xorg-server 1.4 (gentoo x86 unstable).

Kalle, thanks a lot for your tip, I was starting to lose faith :)



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