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[Octave-bug-tracker] [bug #44916] Printing Qt-drawn figures produces fau


From: Rik
Subject: [Octave-bug-tracker] [bug #44916] Printing Qt-drawn figures produces faulty files
Date: Wed, 06 May 2015 19:00:48 +0000
User-agent: Mozilla/5.0 (X11; Ubuntu; Linux x86_64; rv:37.0) Gecko/20100101 Firefox/37.0

Follow-up Comment #41, bug #44916 (project octave):

Won't the change in comment #30 only apply to Qt-based plotting?  If it is
correct that the hardware driver for OpenGL that is causing the problem then
FLTK should still produce faulty output.

This could, at least, help confirm that the issue is the HW driver.  Steps to
take are running the altered code from jwe in comment #30 on a failing system
and then printing the failing figure twice using the two toolkits qt and fltk.
 The qt toolkit should pass and the FLTK toolkit should fail.

Assuming that is correct, it would be nice to have something like mesa
installed so that we could have both toolkits switch over to software
rendering if there was a problem.  It certainly would also be good to have a
configuration option for this at run-time.  It's not like we have gotten a lot
of reports about this so HW based rendering is probably okay on > 75% of
machines.  The majority shouldn't be held hostage to the minority in this
case.

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  <http://savannah.gnu.org/bugs/?44916>

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