[Bug 796846] compositor: Use 255 as maximum alpha instead of 256

[GStreamer (GNOME Bugzilla)]

https://bugzilla.gnome.org/show_bug.cgi?id=796846

--- Comment #5 from Sebastian Dröge (slomo) <slomo at coaxion.net> ---
(In reply to Jan Schmidt from comment #3)
> 
> On 2nd look though, this macro isn't used anywhere and can just be deleted.

Done, removed :)

(In reply to Thibault Saunier from comment #2)
> Review of attachment 373108 [details] [review]:
> 
> That makes sense, but then, this bug should be trigerable without using
> crossfade-ratio too right?

Probably, I didn't try very hard though. You basically would need to get alpha
of 256 in the C code before passing it to orc, which happens more easily with
crossfading because there you have two alphas that are individually
controllable

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