Improve multi-window render clipping logic

Fixes: 28125010

Restructures 'scene defer', to implement window backdrop overdraw
avoidance in new render pipeline, and disable clipping to content draw
bounds.

Also restructures FrameBuilder's constructors, to separate out into
multiple defer methods.

Change-Id: I53facb904c1a4a4acc493d8a489921a79a50494e

1 files changed, 2 insertions, 1 deletions

diff --git a/libs/hwui/LayerBuilder.cpp b/libs/hwui/LayerBuilder.cpp
index eea11bff7d8a..30007772b1bc 100644
--- a/libs/hwui/LayerBuilder.cpp
+++ b/libs/hwui/LayerBuilder.cpp
@@ -244,7 +244,8 @@ void LayerBuilder::onDeferOp(LinearAllocator& allocator, const BakedOpState* bak
 
         if (CC_UNLIKELY(activeUnclippedSaveLayers.empty()
                 && bakedState->computedState.opaqueOverClippedBounds
-                && bakedState->computedState.clippedBounds.contains(repaintRect))) {
+                && bakedState->computedState.clippedBounds.contains(repaintRect)
+                && !Properties::debugOverdraw)) {
             // discard all deferred drawing ops, since new one will occlude them
             clear();
         }