Assume I have a routine:
int draw(cairo_t *cr)
used to draw an overlay in a GdkWindow.
In order to minimize redrawing, I would like to get the minimal (up to some
accuracy to be determined) set of GdkRegion's that encompasses all the
drawing of draw().
I thought of doing this by creating a low resolution cairo image surface
that I pass to draw() and check if pixels are "dirty" in which case it
indicates that the corresponding rectangle in the source GdkWindow needs to
redrawn.
Is there a better method?
Thanks!
Dov
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