I had a much simpler idea: overlay the previous frame on the video field,
offset
by the desired amount (say, 70%).  This is what many consumer digicams do
in
panorama mode, including my cell phone.  It is then obvious to the user to
turn
the screen until the overlaid image aligns with the camera output.  Based
on the
Video Chat/Virtual Whiteboard mockups, it seems like we have accelerated
alpha
on top of video on the LX, but I don't know this for sure...


Well, that's just so much better!  That makes a lot of sense, and requires
no extra CPU (apart from the compositing, as you mention).  I'll take that
idea into account and mockup a few screenshots for how this could integrate
with Record when I get a chance.

- Eben
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