tree ab784cb40177de9f1118b884b2cc5d1057979a19
parent 2610a1ba5d2657932d46b818472c2713bec7293e
author Chet Haase <chet@google.com> 1411569089 -0700
committer Chet Haase <chet@google.com> 1411569089 -0700

Avoid drawing the starting window twice

Logic in WindowState caused a delayed layout on the starting window,
which forced another layout/draw pass, which was unnecessary. Making
the resize call happen sooner means that that request gets lumped in
with a pending layout request, so there's only one resulting draw.

This saves not only the second drawing operation, but also the creation
of an extra buffer in SurfaceFlinger for that second draw request. This
buffer is temporary, but can be quite large on some devices and push
the system over the memory edge in extreme situations. It's difficult
to track this memory usage difference as the buffer resides at a very
low level in the system. But you can see in systrace that the second
allocation (and the second draw) is not happening after the fix.

Issue #17570761 Constrain starting window to only one buffer

Change-Id: I0e0fff7efdc812730706afccbfb020dea3f8d3e2