Bug 782413: Only paint widgets that have a layer manager. r=cjones

view/src/nsViewManager.cpp

@@ -398,11 +398,11 @@ void nsViewManager::ProcessPendingUpdatesForView(nsView* aView,
 
   // Push out updates after we've processed the children; ensures that
   // damage is applied based on the final widget geometry
-  if (aFlushDirtyRegion) {
+  if (aFlushDirtyRegion && aView->HasNonEmptyDirtyRegion()) {
+    FlushDirtyRegionToWidget(aView);
     if (IsRefreshDriverPaintingEnabled()) {
       nsIWidget *widget = aView->GetWidget();
-      if (widget && widget->NeedsPaint() && aView->HasNonEmptyDirtyRegion()) {
+      if (widget && widget->NeedsPaint()) {
-        FlushDirtyRegionToWidget(aView);
         // If an ancestor widget was hidden and then shown, we could
         // have a delayed resize to handle.
         for (nsViewManager *vm = this; vm;
@@ -431,8 +431,6 @@ void nsViewManager::ProcessPendingUpdatesForView(nsView* aView,
 #endif
         SetPainting(false);
       }
-    } else {
-      FlushDirtyRegionToWidget(aView);
     }
   }
 }

widget/gonk/nsWindow.cpp

@@ -525,6 +525,7 @@ nsWindow::GetLayerManager(PLayersChild* aShadowManager,
     if (mLayerManager)
         return mLayerManager;
 
+    LOG("Creating layer Manaer\n");
     // Set mUseAcceleratedRendering here to make it consistent with
     // nsBaseWidget::GetLayerManager
     mUseAcceleratedRendering = GetShouldAccelerate();
@@ -635,6 +636,15 @@ nsWindow::GetNaturalBounds()
     return gScreenBounds;
 }
 
+bool
+nsWindow::NeedsPaint()
+{
+  if (!mLayerManager) {
+    return false;
+  }
+  return nsIWidget::NeedsPaint();
+}
+
 // nsScreenGonk.cpp
 
 nsScreenGonk::nsScreenGonk(void *nativeScreen)

widget/gonk/nsWindow.h

@@ -106,6 +106,7 @@ public:
     virtual PRUint32 GetGLFrameBufferFormat() MOZ_OVERRIDE;
 
     virtual nsIntRect GetNaturalBounds() MOZ_OVERRIDE;
+    virtual bool NeedsPaint();
 
 protected:
     nsWindow* mParent;