Re: Grab a pixmap / screenshot thing

["muppet" <scott asofyet org>]

A. Pagaltzis wrote:
> * zentara <zentara1 sbcglobal net> [2006-11-07 21:00]:
> > I wonder if it can be used in a thread, to take a series of
> > screenshots thru a timer, which can then be assembled into an
> > mpg movie of the screen action. ?
>
> Theoretically yes. Too much CPU load in practice for any useful
> framerate. To do this well would require speaking XDamage to the
> server to pick up only parts that have changed from frame to
> frame.

Really, it's more the fact that the image is sent back to the client from the
server with XGetImage().  That means marshalling from device pixels to 24-bit
RGB and sending that over the wire to the client (possibly shm on the same
machine, but still, IPC).  The performance suckiness of such a scheme is why
things like XDamage and XVnc exist.  ;-)


-- 
muppet <scott at asofyet dot org>