Hi, all

I wonder the behavior of overlay_queuebuffer. Does it block the
application? Our display hardware swap buffers on per vetical retrace.
So during queueBuffer, there can be 2 implementation here:

1. Record the buffer, and return immediately. Driver will post it in
the next vertical retrace interrupt.
2. Block the application, and return until the next vertical retrace.

Item 1 will save more time. But it seems that Android has no interface
to define MAX queue number. For example, if user press "Pause" bottom
of the application, there may be still quite many commands queued to
display. So that application can't stop overlay display in time.

Regards,
Jill

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