rethrowing events, and digests

[Egbert Eich]

Keith Packard writes:
 > But, there's no (current) way to filter events.  We need something like 
 > this to deal with transformed windows.  I'm a bit worried about latency 
 > though; I'm wondering if the X server should have a monopoly on 
 > communication with the mouse.
 > 

Maybe no monopoly, but in a networked environment the Xserver may be 
the only instance that has full access to the input devices. Delivering 
events from a central agent is not all that wrong. If latencies are an 
issue one should rather think of a different way to deliver these events 
to interested clients. 
Media streaming has the same problem: they must guarantee a maximal 
latency.
I've been playing a little bit with an extention that intercepts
input events before they get delivered to clients and is able to 
modify them. I'm also concerned that latencies may introduce 
undesireable side effects and races. 
Also allowing a client to receive events bypassing any device 
grabs introduces a security hole. 

Egbert.