Add correct damage and visible regions for cached buffers.

To ensure that these are reasonably accurate when using caching so that
we're robust to partial update support in composer:

1. Set the visible region to be the union of visible regions for all
cached layers.
2. When the cached set is first created, set the surface damage to be
the cached set. For subsequent frames, set the surface damage to be
empty.

Bug: 183456093
Test: libcompositionengine_test

Change-Id: I2b7b3b4b5630011323a802908c5a80917bdb86ef
diff --git a/services/surfaceflinger/CompositionEngine/src/OutputLayer.cpp b/services/surfaceflinger/CompositionEngine/src/OutputLayer.cpp
index fd06de5..3f36a8f 100644
--- a/services/surfaceflinger/CompositionEngine/src/OutputLayer.cpp
+++ b/services/surfaceflinger/CompositionEngine/src/OutputLayer.cpp
@@ -355,7 +355,7 @@
     Rect displayFrame = outputDependentState.displayFrame;
     FloatRect sourceCrop = outputDependentState.sourceCrop;
 
-    if (outputDependentState.overrideInfo.buffer != nullptr) { // adyabr
+    if (outputDependentState.overrideInfo.buffer != nullptr) {
         displayFrame = outputDependentState.overrideInfo.displayFrame;
         sourceCrop = displayFrame.toFloatRect();
     }
@@ -429,8 +429,10 @@
 
     // TODO(lpique): b/121291683 outputSpaceVisibleRegion is output-dependent geometry
     // state and should not change every frame.
-    if (auto error = hwcLayer->setVisibleRegion(outputDependentState.outputSpaceVisibleRegion);
-        error != hal::Error::NONE) {
+    Region visibleRegion = outputDependentState.overrideInfo.buffer
+            ? Region(outputDependentState.overrideInfo.visibleRegion)
+            : outputDependentState.outputSpaceVisibleRegion;
+    if (auto error = hwcLayer->setVisibleRegion(visibleRegion); error != hal::Error::NONE) {
         ALOGE("[%s] Failed to set visible region: %s (%d)", getLayerFE().getDebugName(),
               to_string(error).c_str(), static_cast<int32_t>(error));
         outputDependentState.outputSpaceVisibleRegion.dump(LOG_TAG);
@@ -459,8 +461,11 @@
                   to_string(error).c_str(), static_cast<int32_t>(error));
     }
 
-    if (auto error = hwcLayer->setSurfaceDamage(outputIndependentState.surfaceDamage);
-        error != hal::Error::NONE) {
+    const Region& surfaceDamage = getState().overrideInfo.buffer
+            ? getState().overrideInfo.damageRegion
+            : outputIndependentState.surfaceDamage;
+
+    if (auto error = hwcLayer->setSurfaceDamage(surfaceDamage); error != hal::Error::NONE) {
         ALOGE("[%s] Failed to set surface damage: %s (%d)", getLayerFE().getDebugName(),
               to_string(error).c_str(), static_cast<int32_t>(error));
         outputIndependentState.surfaceDamage.dump(LOG_TAG);