[Bug 753821] assrender: improve overlay blending performance

[GStreamer (GNOME Bugzilla)]

https://bugzilla.gnome.org/show_bug.cgi?id=753821

--- Comment #2 from Arnaud Vrac <rawoul at gmail.com> ---
Blending of libass images is special since you need to blend many 1bpp images,
each having a different ARGB color. It might be possible to optimise the code
but I'm not sure the generic composition blending code could help here.

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