[PATCH weston] compositor: Schedule repaint after assigning output.

Scott Moreau oreaus at gmail.com
Tue Aug 14 12:32:23 PDT 2012

On Tue, Aug 14, 2012 at 8:09 AM, Kristian Høgsberg <hoegsberg at gmail.com>wrote:

> On Tue, Aug 14, 2012 at 03:51:40AM -0600, Scott Moreau wrote:
> > This fixes a bug exposed by 982387011ff where tooltips were not drawn
> while
> > the compositor is idle until the next output repaint.
> > ---
> >
> > Just schedule a repaint instead of preemptively calling
> weston_surface_update_transform().
> This isn't right either.  We don't want to schedule a full repaint
> whenever we go through weston_surface_assign_output().  I think when
> we started using weston_surface_schedule_repaint() instead of
> weston_compositor_schedule_repaint() in a few places, we changed
> weston_surface_damage() to not schedule repaints when the surface
> isn't visible.
> So the bug is that there are still a few places that rely on that
> behaviour and we need to fix those to call
> weston_compositor_schedule_repaint() instead of
> weston_surface_damage().  I was thinking that shell.c map() was guilty
> of that, but it does call assign output, and the client then later
> calls wl_surface.damage, which calls weston_surface_damage(), which
> (with an output now assigned) will schedule the repaint.  Not sure..
> Kristian
I'm not sure what you want to do then. Calling a 'full repaint' doesn't
actually damage the entire screen, it only damages what intersects with
what is actually damaged. You can see this with the useful damage debug
patch. The real problem is that the transform region is empty when assign
output is called. The resulting bug is a problem that many have noticed and
needs attention. However I'm done looking into it. So to recap, this patch
the bug and this is the explanation I came up with after debugging

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