[PATCH 0/10] Add a mechanism for nested compositors to use subsurfaces without blitting

[Neil Roberts]

Looking at the Weston branch again I found some problems so I've force
pushed a new version.

I wasn't destroying the wl_buffer that the subcompositor creates with
eglCreateWaylandBufferFromImageWL when the client destroys its buffer.
This doesn't really matter because in this example the client doesn't
destroy any buffers but it's nice to make it complete in case someone
tries to use the code as a basis.

To test that I was doing killall on weston-nested-client which showed
some other bugs. I added this patch at the beginning to remove the
surface from the list when a surface is destroyed:

https://github.com/bpeel/weston/commit/12c21d9b1448e401096939b11fc

Similarly the subsurface renderer wasn't destroying its frame callback
when the surface was destroyed so it would sometimes crash.

I also took out the note about using 3 buffers with the subsurface
renderer in one of the commit messages because that no longer happens
with v2 of the Mesa patch.

Regards,
- Neil
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