[Bug 740625] video: overlay composition blending in software should cache scaled/converted overlay rectangles

[GStreamer (GNOME Bugzilla)]

https://bugzilla.gnome.org/show_bug.cgi?id=740625

--- Comment #2 from Tim-Philipp Müller <t.i.m at zen.co.uk> ---
Created attachment 305837
  --> https://bugzilla.gnome.org/attachment.cgi?id=305837&action=edit
WIP: video: overlay-composition: cache converted rectangles when blending

Work-in-progress patch. Doesn't work properly yet, probably because it doesn't
take the fact that the RGBA from textoverlay is pre-multiplied into account
when converting to AYUV. Seems to work fine with gdkpixbufoverlay though.

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