Re: expose event compression

[John Cupitt <john cupitt ng-london org uk>]

Great! Fixed my problem exactly, thanks very much.

John

Soeren Sandmann wrote:
> > One of the app's widgets is an image display window, and one of the
> > tools is a panner. Pure left/right and up/down pans are fast and
> > smooth, but diagonal drags are very choppy. I think this is because
> > gtk is sending me the bounding box of all exposes since the last
> > repaint, and for a diagonal drag, the bounding box of a thin strip
> > down the right and a thin strip across the bottom is the entire
> > window. Has anyone come across this before, and is there an easy
> > solution?
>
> If your problem is as you describe (which may well be the case), then
> look at the "region" field in the expose event. That field will
> contain a GdkRegion indicating the exact area that needs to be
> painted.
>
> You can use gdk_region_get_rectangles() to convert the region to a
> list of rectangles that needs to be repainted.