commit 9a0afda7680840a704f179b20f97d5a4a3cf8780
author Leon Scroggins III <scroggo@google.com> Tue Jan 11 16:53:09 2022 -0500
committer Leon Scroggins III <scroggo@google.com> Fri Jan 28 15:48:47 2022 -0500
tree 6c3e8b507f7e4969f09645ebbc9e1195fd7b0772
parent 701625279bbe4e08d7cc638835b098dbccecf00d

Set blockingRegion for DISPLAY_DECORATION layers

Devices that have support for DISPLAY_DECORATION layers may also have
support for a blockingRegion, which will allow the DPU to skip regions
that are known to be transparent, in order to save power.

Use the transparentRegionHint to compute the blockingRegion. It may not
be accurate for all layers, which is why it is only used for
DISPLAY_DECORATION layers.

Add tests.

Bug: 212736475
Test: libcompositionengine_test
Change-Id: I6c5d29614dc8d65d8481150ce717a440192083a0