Hi,
I can also confirm that I have this very annoying flickering in Linux
Ubuntu / KDE - and it is really embarrassing when showing QGIS to
someone. The work on the threading branch should hopefully be done by
Martin (and others for the providers) until the end of the year. Then we
should have a good solution to fix the problem.
Andreas
On Fri, 27 Jul 2012 13:28:15 +0200, Marco Hugentobler wrote:
Hi Matthias
I still have the resize crash with Qt 4.8.1. To reproduce, load a
layer with many objects. Go with the mouse to the right corner and
resize several times without releasing the mouse. After the mouse
release, the crash occures.
Note: this problem (and the flicker with the workaround) is X11 only.
But still, Linux is the most important platform.
Btw, the threading branch would be the clean solution for the issue.
But if you have another workaround in the short-term, let me know.
Regards,
Marco
Am 27.07.2012 13:08, schrieb Matthias Kuhn:
Hi all,
there is this issue report #4011 "Map canvas flickers when content
is
dragged" which is actually pretty annoying and doesn't get much
attention. ( http://hub.qgis.org/issues/4011 ) I think the solution
would be pretty simple. Please read on.
It was introduced by f4d26d6211830a866030a333236dcfbf15e077aa "Fix
for
resize crash, ticket #2714".
This bugfix disables backbuffering, what fixes the crash but leads
to
the beforementioned flickering.
The crash seems to be related to Qt versions (probably 4.6 and 4.7
affected). When I tried to reproduce the crash in 4.8.1 (by
reverting
abovementioned patch) I couldn't reproduce the crash. So it is well
possible that this problem has been fixed in Qt upstreams.
But: I myself never could reproduce this crash (due to the lack of a
system with old Qt libs). So, I would be happy if someone familiar
with
this problem could confirm that this is fixed with Qt 4.8.
Then there are two possibilities (unless you come up with a third
one):
1. Check for qVersion upon every repaint as suggested by Martin
Dobias
and then enable/disable the workaround accordingly.
2. Switch the workaround on/off by a pre-compiler constant. This
way,
any new distro with Qt>=4.8 could be shipped without the
workaround-code
being compiled into the binaries.
Any comments on this issue are very welcome, as it makes QGIS look a
lot
sweeter :)
Regards
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