diff --git a/core/java/android/view/HardwareRenderer.java b/core/java/android/view/HardwareRenderer.java
index 7918823bf583f..8055077d58b90 100644
--- a/core/java/android/view/HardwareRenderer.java
+++ b/core/java/android/view/HardwareRenderer.java
@@ -451,10 +451,8 @@ public abstract class HardwareRenderer {
      * @param attachInfo AttachInfo tied to the specified view.
      * @param callbacks Callbacks invoked when drawing happens.
      * @param dirty The dirty rectangle to update, can be null.
-     * 
-     * @return true if the dirty rect was ignored, false otherwise
      */
-    abstract boolean draw(View view, View.AttachInfo attachInfo, HardwareDrawCallbacks callbacks,
+    abstract void draw(View view, View.AttachInfo attachInfo, HardwareDrawCallbacks callbacks,
             Rect dirty);
 
     /**
@@ -992,11 +990,7 @@ public abstract class HardwareRenderer {
                             mCanvas = createCanvas();
                             mCanvas.setName(mName);
                         }
-                        if (mCanvas != null) {
-                            setEnabled(true);
-                        } else {
-                            Log.w(LOG_TAG, "Hardware accelerated Canvas could not be created");
-                        }
+                        setEnabled(true);
                     }
 
                     return mCanvas != null;
@@ -1340,7 +1334,7 @@ public abstract class HardwareRenderer {
         }
 
         @Override
-        boolean draw(View view, View.AttachInfo attachInfo, HardwareDrawCallbacks callbacks,
+        void draw(View view, View.AttachInfo attachInfo, HardwareDrawCallbacks callbacks,
                 Rect dirty) {
             if (canDraw()) {
                 if (!hasDirtyRegions()) {
@@ -1401,11 +1395,8 @@ public abstract class HardwareRenderer {
                     }
 
                     attachInfo.mIgnoreDirtyState = false;
-                    return dirty == null;
                 }
             }
-
-            return false;
         }
 
         private DisplayList buildDisplayList(View view, HardwareCanvas canvas) {
diff --git a/core/java/android/view/ViewRootImpl.java b/core/java/android/view/ViewRootImpl.java
index 9387624e9ce3e..efa8a9e0a6645 100644
--- a/core/java/android/view/ViewRootImpl.java
+++ b/core/java/android/view/ViewRootImpl.java
@@ -197,7 +197,6 @@ public final class ViewRootImpl implements ViewParent,
     int mHeight;
     Rect mDirty;
     final Rect mCurrentDirty = new Rect();
-    final Rect mPreviousDirty = new Rect();
     boolean mIsAnimating;
 
     CompatibilityInfo.Translator mTranslator;
@@ -767,10 +766,11 @@ public final class ViewRootImpl implements ViewParent,
 
                 final boolean translucent = attrs.format != PixelFormat.OPAQUE;
                 mAttachInfo.mHardwareRenderer = HardwareRenderer.createGlRenderer(2, translucent);
-                mAttachInfo.mHardwareRenderer.setName(attrs.getTitle().toString());
-                mAttachInfo.mHardwareAccelerated = mAttachInfo.mHardwareAccelerationRequested
-                        = mAttachInfo.mHardwareRenderer != null;
-
+                if (mAttachInfo.mHardwareRenderer != null) {
+                    mAttachInfo.mHardwareRenderer.setName(attrs.getTitle().toString());
+                    mAttachInfo.mHardwareAccelerated =
+                            mAttachInfo.mHardwareAccelerationRequested = true;
+                }
             } else if (fakeHwAccelerated) {
                 // The window had wanted to use hardware acceleration, but this
                 // is not allowed in its process.  By setting this flag, it can
@@ -2387,14 +2387,10 @@ public final class ViewRootImpl implements ViewParent,
                 mResizeAlpha = resizeAlpha;
 
                 mCurrentDirty.set(dirty);
-                mCurrentDirty.union(mPreviousDirty);
-                mPreviousDirty.set(dirty);
                 dirty.setEmpty();
 
-                if (attachInfo.mHardwareRenderer.draw(mView, attachInfo, this,
-                        animating ? null : mCurrentDirty)) {
-                    mPreviousDirty.set(0, 0, mWidth, mHeight);
-                }
+                attachInfo.mHardwareRenderer.draw(mView, attachInfo, this,
+                        animating ? null : mCurrentDirty);
             } else {
                 // If we get here with a disabled & requested hardware renderer, something went
                 // wrong (an invalidate posted right before we destroyed the hardware surface
@@ -2449,6 +2445,8 @@ public final class ViewRootImpl implements ViewParent,
 
             canvas = mSurface.lockCanvas(dirty);
 
+            // The dirty rectangle can be modified by Surface.lockCanvas()
+            //noinspection ConstantConditions
             if (left != dirty.left || top != dirty.top || right != dirty.right ||
                     bottom != dirty.bottom) {
                 attachInfo.mIgnoreDirtyState = true;
@@ -3099,8 +3097,7 @@ public final class ViewRootImpl implements ViewParent,
                         boolean inTouchMode = msg.arg2 != 0;
                         ensureTouchModeLocally(inTouchMode);
 
-                        if (mAttachInfo.mHardwareRenderer != null &&
-                                mSurface != null && mSurface.isValid()) {
+                        if (mAttachInfo.mHardwareRenderer != null && mSurface.isValid()){
                             mFullRedrawNeeded = true;
                             try {
                                 mAttachInfo.mHardwareRenderer.initializeIfNeeded(