[Wayland-bugs] [Bug 72351] New: x11-backend with pixman renderer does not repaint on Expose

[bugzilla-daemon at freedesktop.org]

https://bugs.freedesktop.org/show_bug.cgi?id=72351

          Priority: medium
            Bug ID: 72351
          Assignee: wayland-bugs at lists.freedesktop.org
           Summary: x11-backend with pixman renderer does not repaint on
                    Expose
          Severity: minor
    Classification: Unclassified
                OS: All
          Reporter: ppaalanen at gmail.com
          Hardware: Other
            Status: NEW
           Version: unspecified
         Component: weston
           Product: Wayland

I'm running X without a compositing manager. When I run Weston's x11-backend
with the pixman renderer, the weston window does not repaint on Expose events.
For example, visit a different virtual desktop and return, and Weston's window
contains garbage. Forcing Weston to repaint by other means, like moving a
window inside weston, fixes the damage.

This is Daniel's analysis:
- the x11/pixman thing only happens if you aren't also using an x11 compositing
manager
- and it's not handling the Expose events, needs to force a redraw when that
happens; atm it does queue an output repaint, but with an empty region, so
nothing actually gets re-rendered

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