tree 9ac1ad4873135c00cddb91d7f7672d8ebb4eda08
parent 74cb3b6d6b6077fc0280d1700d9fe54d59b32783
author Dennis Kempin <denniskempin@google.com> 1495073791 -0700
committer Dennis Kempin <denniskempin@google.com> 1495154260 -0700

Surface: Do not copy back if front and back buffer are identical

It is unnecessary to copy from and to the same surface. Skipping
the copy back is a huge performance improvement when using shared
buffer mode and locking a rectangle of the surface.

Bug: 38398135
Test: Use stylus demo and remove full-surface locking hack.
Change-Id: Ie8d03468507489247ba4a4be5f0cde5960e69c16