WindowManagerService: Handle transparent region on client

Since the client owns its own SurfaceControl now, there is no
need to call through to the WM just to set transparent regions.

Bug: 161937501
Test: Existing tests pass
Change-Id: I1767090bc60be72b86879ae806876d49bfa0e06c

1 files changed, 8 insertions, 5 deletions

diff --git a/core/java/android/view/ViewRootImpl.java b/core/java/android/view/ViewRootImpl.java
index 036a703f178c..8fd897c1c7ee 100644
--- a/core/java/android/view/ViewRootImpl.java
+++ b/core/java/android/view/ViewRootImpl.java
@@ -3063,11 +3063,14 @@ public final class ViewRootImpl implements ViewParent,
                 if (!mTransparentRegion.equals(mPreviousTransparentRegion)) {
                     mPreviousTransparentRegion.set(mTransparentRegion);
                     mFullRedrawNeeded = true;
-                    // reconfigure window manager
-                    try {
-                        mWindowSession.setTransparentRegion(mWindow, mTransparentRegion);
-                    } catch (RemoteException e) {
-                    }
+                    // TODO: Ideally we would do this in prepareSurfaces,
+                    // but prepareSurfaces is currently working under
+                    // the assumption that we paused the render thread
+                    // via the WM relayout code path. We probably eventually
+                    // want to synchronize transparent region hint changes
+                    // with draws.
+                    mTransaction.setTransparentRegionHint(getSurfaceControl(),
+                        mTransparentRegion).apply();
                 }
             }