[Bug 743345] glimagesink: Add support for dmabuf

[bugzilla at gnome.org]

https://bugzilla.gnome.org/show_bug.cgi?id=743345

--- Comment #14 from Daniel Stone <daniel at fooishbar.org> ---
A couple of things:
  - being able to mmap() dmabufs is not only not guaranteed, but also not
implemented by DRM/KMS exporters
  - dma_buf_export isn't merged into Mesa, hasn't even been proposed for
merging, and is unlikely to see wide adoption for a spectacular variety of
issues (tl;dr: importing is easy - exporting forces you to change the entire
buffer allocation process - and given we've never been able to agree on generic
buffer allocation ...)

I've no particular opinion on the rest.

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