Re: jerky viewport scrolling performance GTK+

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

Not sure if this is your problem, but I had very helpful mails a few month ago from Owen and Sven when I asked about diagonal scrolling slowness. Here's the one from Soeren:

Soeren Sandmann wrote:
> John Cupitt <john cupitt ng-london org uk> writes:
>
>
> > 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.
>
>
> Soren

Lambert Schomaker wrote:
> Hi GTK-ers,
>
>  for those interested in my jerky scroll problem: here is
> the .tgz with the .tif file that  shows it on my supposedly
> fast 3 GHz system.
>
> http://www.ai.rug.nl/~lambert/overslag/jerky-image-viewer.tgz
>
> The binary is  here:
>  > cd jerky-image-viewer/src/
>  > project2                                    (my intelligent name for 
> the binary)
>
> You may want to do a make on your own system.
> All help is appreciated.
>
> Best regards,
> Lambert
>
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