[compiz] Accessibility: mouse guides for Compiz, and forthcoming contributions

[MC Return]

Hey Luca,

The performance problem you are experiencing is probably the latency 
introduced by getting the mousepointer position via the mousepoll plugin 
and a Mousepoller, which has problems to deliver the position updates 
smoothly.
Mousepoll tries to solve the problem of not calling XQueryPointer () 
from individual plugins directly, but to centralize those calls, as they 
are blocking and can sometimes take up to (as tests showed here) 200 
nanoseconds to complete.
Nevertheless Mousepoll was a bad solution to a real problem - try to 
simply update the mousecursor position by calling XQueryPointer () in 
preparePaint (), which is called directly before painting, so each 16666 
nanoseconds
at 60fps and is only enabled via setFunctions () if the showmouse plugin 
(rulers or particles) is active.

Greetinx.
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