[Bug 666090] videoconvert: Add support for GST_VIDEO_FLAG_PREMULTIPLIED_ALPHA

[GStreamer (GNOME Bugzilla)]

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

Nicolas Dufresne (stormer) <nicolas.dufresne at collabora.co.uk> changed:

           What    |Removed                     |Added
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                 CC|                            |nicolas.dufresne at collabora.
                   |                            |co.uk

--- Comment #8 from Nicolas Dufresne (stormer) <nicolas.dufresne at collabora.co.uk> ---
A compromise could be to allocate an extra buffer, in which we store the
pre-multiplied colors. This way we can reference the original and the
premultiplied colors as needed to maintain precision. And we don't need to
"unmultiply" at the end.

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