On Wed, Jul 4, 2012 at 3:35 AM, Pierre Ossman wrote:
> On Tue, 3 Jul 2012 16:42:11 -0400
> Brian Hinz wrote:
>
> > Hi Pierre,
> >
> > I'm not sure if this means anything to you, but I found that if I set
> > 'AlwaysSetDeferUpdateTimer=1' then outline boxes are partially drawn and
> > damaged regions are sometimes partially redrawn. The location and extent
> > to which the lines are drawn is seemingly random, but it's never complete
> > (except when a screen refresh is requested). Also, the value of
> > 'DeferUpdate' does not seem to make any difference. Any thoughts?
> >
>
> Nothing obvious comes to mind, no. I'm not sure what your test case is,
> but if you're dragging windows around then having a deferred update
> might work as a workaround for the problem. The server would in that
> case really be registering multiple changes of the working parts of the
> border, which then happen to overlap the areas that are overlooked.
>
> One idea is to ask on the X list for suggestions on where in the Xorg
> code that the server does the implicit rendering. That might make it
> easier to trace where we should have hooks.
I stumbled onto this bug report for Xquartz:
http://xquartz.macosforge.org/trac/ticket/290
The ticket is marked as closed but if you follow the thread, the Xorg bug
is re-opened:
https://bugs.freedesktop.org/show_bug.cgi?id=26124
It certainly appears to be the same or very similar problem.
After applying the patches from
http://cgit.freedesktop.org/xorg/xserver/commit/?id=2d6a8f668342a5190cdf43b5d385f592d10f5900
there
does seem to be some improvement. Damaged regions are generally repaired
correctly if the window is dragged around or over top of another area
without borders (even if that area is not obscured by the window), but the
initial drawing is not performed and if a window is redrawn (or shaded up &
down) the borders are cleared.
I've appended a comment to the xorg bug as well.
-brian
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