[Qgis-developer] X11: Map canvas flicker

[Matthias Kuhn]

Thanks for testing.
I realized, that this also happens here, so this patch gets my -1 as 
well in its current state.
But this will still improve the situation for people which cannot turn 
on backbuffering because they need to be able to interrupt the 
rendering process or need incremental drawing.

On the other hand, this could easily be done by setting an environment 
variable (and therefore does not need any patch and is easily 
changeable if bad side-effects occur). So instead of applying something 
to the source, this could by done by setting the environment variable 
"QT_GRAPHICSSYSTEM=X11" by e.g. requesting the packagers to modify the 
qgis.desktop file to include "Exec=env QT_GRAPHICSSYSTEM=X11 
/usr/bin/qgis"

This solution could also easily be backported to older releases of QGIS 
without having to release a patched source.

On Mit 28 Aug 2013 17:35:39 CEST, Alexander Bruy wrote:
> Just tested patch and I still get white stripes when measuring
> and digitizing. Sometimes also when panning.
>
> 2013/8/28 Matthias Kuhn <matthias.kuhn at gmx.ch>:
>> Hi,
>>
>> About a year ago I developed a fix for the flickering problem on X11.
>> This has some major disadvantages like a rendering process cannot be
>> aborted with the "Esc" key and apparently there have been some artifacts
>> on dock windows (although this seem to have disappeared magically)
>>
>> However, recently Donovan Cameron came up with a comment [1] which
>> solves the flickering issue without the drawbacks of the workaround
>> currently in place.
>> As the merge window is almost closed, I would like to point to pull
>> request 834 [2] and ask, if there is any objection to merging this. It
>> should only affect linux systems, but resolves a a long-standing and
>> annoying issue there.
>>
>> Any feedback on this is appreciated.
>> Regards,
>> Matthias
>>
>> [1] http://hub.qgis.org/issues/4011#note-31
>> [2] https://github.com/qgis/Quantum-GIS/pull/834
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