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compositor: copy frames as-is when possible

Nirbheek Chauhan requested to merge nirbheek/gst-plugins-base:compositor-copy-frames-as-is into master

The blend functions for alpha formats need to do more work than just doing a memcpy, so we can do a memcpy when we know that a blend is not actually needed.

1080p AYUV ! compositor background=transparent ! fakesink - 56% faster

Specifically, when we don't draw the background and the first pad we draw completely covers the output frame, we can just copy it as-is. The rest of the pads (if any) will get composited on top normally.

Edited by Nirbheek Chauhan

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