[PATCH weston] desktop-shell: do not black out with startup "none"

[Pekka Paalanen]

On Tue, 26 May 2015 23:59:41 -0700
Bryce Harrington <bryce at osg.samsung.com> wrote:

> On Wed, May 27, 2015 at 09:48:50AM +0300, Pekka Paalanen wrote:

> > One thing worth to note: if Weston is using "none" background meaning
> > that we get undefined (garbage) content, then removing a wl_surface may
> > not really remove the surface's image from the screen, because there is
> > nothing that would make Weston to scrub it (paint over it). Therefore
> > no screenshooting test should ever rely on that scrubbing unless we
> > know there is something that enforces the image to disappear.
> 
> Is there a way weston can forcibly ensure this is always zeroed when
> doing testing so there's no question, without burdening test writers
> from needing to be aware of it?

One way would be to set up a solid color surface beneath everything.
I'd hesitate to make it a test-only feature, so if it's added, it
should be there also in production. We could make it nice and pink, so
that it would reveal problems like badly rendered wallpapers.

But I think it may need integration with the shell plugins, because the
shells are in charge of the scenegraph. The other option being ad hoc
hacking it in weston core...

Not sure what's best.


Thanks,
pq