What is wesron_plane?

[Sichem Zhou]

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`?

Thanks alot

Sichem
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