compositing and windows

["Jose Hevia" <jose francisco hevia gmail com>]

Hello:

I have been doing experimentents with gtk and cairo and alpha compositing.

I want to do very computationally intensive operations, and when I
benchmark it, I realize the window size is very important in making it
slow [ef ~= constant/(width*height)].

The problem is that I could do the same I do in one big window, in
multiple small windows if I manage to control them.
I could do it using gtk_window_move and gtk_window_get_position but
I'd like to be able to handle the signal when the main window moves. I
search in the docs, but seems I can't find any signal as a window, or
as a widget that can catch it.

Does anybody had this problem before?

             Jose Hevia