[RFC Weston 00/10] Sub-surfaces v2

[Kai-Uwe Behrmann]

Hello Pekka,

Am 22.02.2013 16:07, schrieb Pekka Paalanen:
> - A totally new demo client presenting sub-surfaces, including
>    Cairo-image rendered window with a pure EGL/GL widget in a
>    sub-surface, running independently, but still without glitches
>    on resize (sans bugs).
>    http://people.collabora.com/~pq/subsurface-2.png

The above example shows non overlapping regions. For a more throughout 
test, I would expect overlapping regions with and without alpha to test 
Z-order behaviour.

> The biggest improvement over v1 is that we have some thought-out
> commit behaviours. It is possible to resize a window so that all
> surfaces stay in sync on screen, and it is also possible to have
> sub-surfaces running on their own (i.e. without commit the
> parent surface, too).

What is the default behaviour of repainting in regards to Z-order? Draw 
all surfaces? I other words, is the possibility to have sub-surfaces 
running on their own only optional?

kind regards
Kai-Uwe