[Bug 666090] videoconvert: Add support for GST_VIDEO_FLAG_PREMULTIPLIED_ALPHA

[GStreamer (GNOME Bugzilla)]

https://bugzilla.gnome.org/show_bug.cgi?id=666090

Wim Taymans <wim.taymans at gmail.com> changed:

           What    |Removed                     |Added
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                 CC|                            |wim.taymans at gmail.com

--- Comment #3 from Wim Taymans <wim.taymans at gmail.com> ---
video-convert should use premultiplied alpha when doing scaling or else you can
get wrong colors from neighbouring pixels with 0 alpha.

video-convert should therefore look at the input video-info flags and
premultiply before scaling if needed, then look at the output flags and
unpremultiply if needed.

We don't have anything in the caps to mark premultiplied alpha.

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