tree 0072ca6810ee57122aa5b56abf52b18032b0f6f1
parent 0a4b951a590910bab35f20f03d25316426dbf8ae
author Vishnu Nair <vishnun@google.com> 1579646168 -0800
committer Vishnu Nair <vishnun@google.com> 1579670270 -0800

Skip client composition requests

Keep track of client compositions requests in CompositionEngine and
the buffer used to render the request. If the requests do not change
and the buffer matches, reuse the buffer instead of going
to client composition.

Certain layers properties (buffer format, rounded corner or shadows)
will force the device to go into GPU or mixed composition. In mixed
composition scenarios, we can avoid redundant client composition
requests by reusing the RenderSurface buffers. If the device goes
into GPU composition then all the layers will be composited and there
will be no performance benefit.

Bug: b/136561771, b/144690120

Test: dump SurfaceFlinger --timestats -dump
Test: manual testing with mixed and gpu composition scenarios
Test: atest libcompositionengine_test libsurfaceflinger_unittest SurfaceFlinger_test
Change-Id: I466d5dcded0c9fcfa64bc72fd91dfaddd795f315