[udig-devel] _slow_ ui performance in Linux with cairo

[Gabriel Roldán]

Hi Aleksander, thanks for your reply

Switching off antialiasing in ViewPortPaneSWT solves only half (maybe 1/3?) of 
the problem, good hint anyways.

Even with antialiasing off I am experimenting terrible performance (like only 
3 redraws when drawing a zoom box, a little better than with antialiasing ON, 
in which case I got no redraws at all but have to wait for about a second 
once I stop dragging to see the box).

So if you or someone else has any clue on what could be going on I would 
really appreciate that.

Gabriel

On Wednesday 04 October 2006 12:15, Aleksander Bandelj wrote:
> The reason might be antialiasing which is hardcoded in ViewPortPaneSWT
> for some reason (there is a preference which should affect this, but
> doesn't seem to be implemented).
>
>  g.setAntialias(SWT.ON);
>
> I commented it out in my checkout and performance is OK ;) I use same
> cairo version as you (1.2 doesn't work with SWT/Draw2D, even though
> cairo page says it should be binary compatible with 1.0)
>
> Gabriel ďż˝ wrote:
> > Hi all,
> >
> > since the move to eclipse 3.2 (and now 3.2.1), I am experiencing an
> > incredible bad performance on anything that interacts with MapPane, to
> > the point that the app becomes unusable.
> >
> > Looking for the reasons of this change, I noticed that we're now relying
> > on the same ViewportPane implementation (SWT) for the three target
> > platforms. On Linux that means the new cairo based SWT graphics, so I
> > started to inspect my set up, and updated to the latest version available
> > for my distribution:
> >
> > - Cairo 1.0.4 with glitz 0.4.4 (using nVidia OpenGL drivers)
> >
> > So I tried using  ViewportPaneJava instead of ViewportPaneSWT, which
> > restores the tooling graphics to its normal performance, but surprisingly
> > does not refreshes the viewport more or less randomly, like after a zoom
> > or whatever.
> >
> > Is anyone else experimenting this behavior on linux? if not, does
> > somebody know what else I can try?
> >
> > If this is actually a problem with swt+cairo I would suggest to switch
> > back to the awt pane implementation for linux until a solution is found.
> >
> > regards,
> >
> > Gabriel
>
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-- 
Gabriel Roldán (groldan at axios.es)
Axios Engineering (http://www.axios.es)
Tel. +34 944 41 63 84
Fax. +34 944 41 64 90