[Bug 755482] videotestsrc: Force alpha downstream if foreground color contains alpha

[GStreamer (GNOME Bugzilla)]

https://bugzilla.gnome.org/show_bug.cgi?id=755482

--- Comment #5 from Thibault Saunier <tsaunier at gnome.org> ---
(In reply to Sebastian Dröge (slomo) from comment #3)
> Comment on attachment 311962 [details] [review]
> videotestsrc: Force alpha downstream if foreground color contains alpha
> 
> Not sure if this is a good idea. Pipelines that worked before are failing
> now, people might've just left alpha unset for example. Maybe just make it a
> warning and *prefer* alpha formats?

I just WARN if downstream does not support alpha and keep old behaviour in that
case.

> Also this is only really relevant for a few patterns, not all of them, right?

It is potentially relevant for all patterns afaiu.

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