[PATCH weston] compositor: add a masking mechanism to weston_layer

[Pekka Paalanen]

On Tue, 10 Dec 2013 11:13:42 +0100
Giulio Camuffo <giuliocamuffo at gmail.com> wrote:

> 2013/12/10 Jason Ekstrand <jason at jlekstrand.net>:
> > Giulio,
> > Couple thoughts.  First, you don't provide an implementation of the
> > clipping in  any of the renderers.  Probably have to wait on the
> > Collabora people for the RPi renderer, but we should have pixman
> > and gl implementations of this.
> 
> There is no need to add support in the renderers for that. The masking
> is done in view_accumulate_damage(): the part of the view's
> boundingbox that doesn't fit in the mask is added to the view's clip,
> and the renderers then clip that away already.

Does this work if the renderer paints the whole surface regardless of
damage? Rpi-renderer does that, since every surface is on its own
overlay.

The whole damage tracking is kind of unused on the rpi-renderer, since
the firmware will probably redraw everything anyway. Prohibiting damage
will not prevent parts of a surface from being painted. Damage is just
a hint saying what is not necessary to repaint.


Thanks,
pq