tree 13c5dbee2115accb08e1c873145a1d0f3039e038
parent 9737f323762359ca7fa9ec46e4ce4139f0ecc30a
author Alec Mouri <alecmouri@google.com> 1616536845 -0700
committer Alec Mouri <alecmouri@google.com> 1617317024 -0700

Override buffer always sets blend mode and plane alpha

This fixes a caching issue where split screen chrome blanks out the
other side of the split screen, because chrome uses an opaque layer and
is the first layer of the cached set. The opaque bit must not be
propagated to composer, since the cached buffer is allowed to blend with
other layers if there are undamaged regions. Similarly, plane alpha is
already applied when generating the override buffer, so we should not
re-apply a non-zero plane alpha.

Bug: 183480321
Test: libcompositionengine_test
Test: split screen with chrome and recent screen

Change-Id: I22ef304409f15f10435d824e5fab6d0c075d1b9a