What is wesron_plane?

[Sichem Zhou]

Dear Pekka,

Thanks so much, after checking the documents online I finally know what it
does. If I understand correctly, I don't really need to do much with it
since compositors organise views on layers and backends lift the views on
the proper planes if possible. Like cursor or full screen layer.

Regards,
Sichem


Le lun. 14 mai 2018 04 h 50, Pekka Paalanen <ppaalanen at gmail.com> a écrit :

> On Fri, 04 May 2018 19:32:44 +0000
> Sichem Zhou <sichem.zh at gmail.com> wrote:
>
> > Hi all,
> >
> > Many data structure in libweston is straightforward, but I don't really
> > know what does weston_plane do in the compositor. As it seems I don't
> need
> > to deal with it alot. It seems that it's a abstract place to stack
> > `weston_output` and `weston_views`. Like a virtual plane to draw all the
> > outputs on it. What is the relationship between `weston_plane`,
> > `weston_view` and `weston_output`?
>
> Hi,
>
> weston_plane is an intermediate compositing entity to support
> hardware overlays. A backend uses the display hardware to composite
> several weston_planes for a single weston_output. A backend uses a
> renderer to composite weston_views into the primary weston_plane.
>
> For one weston_output, if the backend implements the assign_planes
> hook, the backend may lift some weston_views from the primary
> weston_plane to additional weston_planes. On the additional
> weston_planes, the renderer is not supported, and there is assumed
> to be at most one weston_view to one additional weston_plane, to be
> shown by hardware overlays.
>
> weston_planes are manipulated by the libweston backends, and never
> by libweston users.
>
>
> Thanks,
> pq
>
-------------- next part --------------
An HTML attachment was scrubbed...
URL: <https://lists.freedesktop.org/archives/wayland-devel/attachments/20180514/cf513003/attachment.html>