[cairo-bugs] [Bug 59085] New: Buffer not flushed when drawing R plots

[bugzilla-daemon at freedesktop.org]

https://bugs.freedesktop.org/show_bug.cgi?id=59085

          Priority: medium
            Bug ID: 59085
          Assignee: chris at chris-wilson.co.uk
           Summary: Buffer not flushed when drawing R plots
        QA Contact: cairo-bugs at cairographics.org
          Severity: normal
    Classification: Unclassified
                OS: All
          Reporter: nalimilan at club.fr
          Hardware: x86-64 (AMD64)
            Status: NEW
           Version: 1.12.8
         Component: xlib backend
           Product: cairo

This bug appeared somewhere between Cairo 1.10.2 and 1.12.4, as I could check
by downgrading my packages. It has been experienced on Fedora [1] and Arch [2],
at least.

Using the R statistical framework, plots are not drawn until one resizes the
plot window. Disabling buffered rendering using X11.options(type="nbcairo")
fixes the problem. If you are interested in reproducing the bug, calling
plot(1:10) is enough.

The problem has been reported by people with Intel GPUs (i915 driver) and with
ATI GPUs (Catalyst driver). So it seems to be a Cairo bug, or at least a change
in Cairo unveiled a bug in these drivers.

If you have any suspicion of the commit that may have introduced this, I can
test that version.



1: https://bugzilla.redhat.com/show_bug.cgi?id=891983
2: https://bugs.archlinux.org/task/32597

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