X window alpha channel and "event transparency"

Keith Packard keithp at keithp.com
Sat May 24 11:30:51 PDT 2008

On Sat, 2008-05-24 at 11:41 +0300, Gena Batsyan wrote:
> 1) Is there a way to have an "alpha channel" in some form for an X window.
> Years ago written an app that made a non-rectangular X window, however 
> no partial translucency, every window pixel could be either fully 
> transparent or fully opaque.

Any compositing manager will do this.

> 2) Is there a way for a window not to receive ANY kind of events, or 
> ideally have an event mask for example to ignore anything except mouse 
> movements.

The Shape extension has been enhanced to include an 'input region' which
does precisely this.

keith.packard at intel.com
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