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

[Jesse Eichar]

I think I'm going to query the SWT list about this issue.  There is  
no reason that Linux should be slower than Windows or Macintosh. Both  
of those platforms use the SWT implementation and they have good  
performance.  So it seems like it must be an issue with the GC object  
in SWT.  I will let you know if I can find anything out.

Jesse


On 4-Oct-06, at 6:15 AM, Gabriel Roldán wrote:

> 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
>>
>> _______________________________________________
>> User-friendly Desktop Internet GIS (uDig)
>> http://udig.refractions.net
>> http://lists.refractions.net/mailman/listinfo/udig-devel
>
> -- 
> Gabriel Roldán (groldan at axios.es)
> Axios Engineering (http://www.axios.es)
> Tel. +34 944 41 63 84
> Fax. +34 944 41 64 90
> _______________________________________________
> User-friendly Desktop Internet GIS (uDig)
> http://udig.refractions.net
> http://lists.refractions.net/mailman/listinfo/udig-devel