1 files changed, 12 insertions, 3 deletions

diff --git a/core/java/android/view/ThreadedRenderer.java b/core/java/android/view/ThreadedRenderer.java
index 5d2822d..3d1332c 100644
--- a/core/java/android/view/ThreadedRenderer.java
+++ b/core/java/android/view/ThreadedRenderer.java
@@ -16,6 +16,7 @@
 
 package android.view;
 
+import android.graphics.Color;
 import com.android.internal.R;
 
 import android.content.Context;
@@ -267,7 +268,8 @@ public class ThreadedRenderer extends HardwareRenderer {
         view.mRecreateDisplayList = false;
     }
 
-    private void updateRootDisplayList(View view, HardwareDrawCallbacks callbacks) {
+    private void updateRootDisplayList(View view, HardwareDrawCallbacks callbacks,
+            boolean isStartingWindow) {
         Trace.traceBegin(Trace.TRACE_TAG_VIEW, "getDisplayList");
         updateViewTreeDisplayList(view);
 
@@ -279,6 +281,12 @@ public class ThreadedRenderer extends HardwareRenderer {
                 callbacks.onHardwarePreDraw(canvas);
 
                 canvas.insertReorderBarrier();
+                if (isStartingWindow) {
+                    // Compensate for some situations in which a hw-accelerated surface
+                    // will not be filled with anything by default; this is equivalent
+                    // to the old behavior when the system process was not hw-accelerated
+                    canvas.drawColor(Color.BLACK);
+                }
                 canvas.drawRenderNode(view.getDisplayList());
                 canvas.insertInorderBarrier();
 
@@ -298,7 +306,8 @@ public class ThreadedRenderer extends HardwareRenderer {
     }
 
     @Override
-    void draw(View view, AttachInfo attachInfo, HardwareDrawCallbacks callbacks) {
+    void draw(View view, AttachInfo attachInfo, HardwareDrawCallbacks callbacks,
+            boolean isStartingWindow) {
         attachInfo.mIgnoreDirtyState = true;
         long frameTimeNanos = mChoreographer.getFrameTimeNanos();
         attachInfo.mDrawingTime = frameTimeNanos / TimeUtils.NANOS_PER_MS;
@@ -308,7 +317,7 @@ public class ThreadedRenderer extends HardwareRenderer {
             recordDuration = System.nanoTime();
         }
 
-        updateRootDisplayList(view, callbacks);
+        updateRootDisplayList(view, callbacks, isStartingWindow);
 
         if (mProfilingEnabled) {
             recordDuration = System.nanoTime() - recordDuration;