Bug 598482 part 23. Set a backup timer to update plugin geometry if we don't manage to do any painting or layout flushes for a while. r=roc

layout/base/nsPresContext.cpp

@@ -1081,6 +1081,12 @@ nsPresContext::SetShell(nsIPresShell* aShell)
       mAnimationManager->Disconnect();
       mAnimationManager = nsnull;
     }
+
+    if (IsRoot()) {
+      // Have to cancel our plugin geometry timer, because the
+      // callback for that depends on a non-null presshell.
+      static_cast<nsRootPresContext*>(this)->CancelUpdatePluginGeometryTimer();
+    }
   }
 }
 
@@ -2354,6 +2360,7 @@ nsRootPresContext::~nsRootPresContext()
   NS_ASSERTION(mRegisteredPlugins.Count() == 0,
                "All plugins should have been unregistered");
   CancelDidPaintTimer();
+  CancelUpdatePluginGeometryTimer();
 }
 
 void
@@ -2594,6 +2601,9 @@ nsRootPresContext::UpdatePluginGeometry()
   if (!mNeedsToUpdatePluginGeometry)
     return;
   mNeedsToUpdatePluginGeometry = false;
+  // Cancel out mUpdatePluginGeometryTimer so it doesn't do a random
+  // update when we don't actually want one.
+  CancelUpdatePluginGeometryTimer();
 
   nsIFrame* f = mUpdatePluginGeometryForFrame;
   if (f) {
@@ -2615,6 +2625,12 @@ nsRootPresContext::UpdatePluginGeometry()
   DidApplyPluginGeometryUpdates();
 }
 
+static void
+UpdatePluginGeometryCallback(nsITimer *aTimer, void *aClosure)
+{
+  static_cast<nsRootPresContext*>(aClosure)->UpdatePluginGeometry();
+}
+
 void
 nsRootPresContext::RequestUpdatePluginGeometry(nsIFrame* aFrame)
 {
@@ -2625,7 +2641,19 @@ nsRootPresContext::RequestUpdatePluginGeometry(nsIFrame* aFrame)
     // We'll update the plugin geometry during the next paint in this
     // presContext (either from nsPresShell::WillPaint or from
     // nsPresShell::DidPaint, depending on the platform) or on the next
-    // layout flush, whichever comes first.
+    // layout flush, whichever comes first.  But we may not have anyone
+    // flush layout, and paints might get optimized away if the old
+    // plugin geometry covers the whole canvas, so set a backup timer to
+    // do this too.  We want to make sure this won't fire before our
+    // normal paint notifications, if those would update the geometry,
+    // so set it for double the refresh driver interval.
+    mUpdatePluginGeometryTimer = do_CreateInstance("@mozilla.org/timer;1");
+    if (mUpdatePluginGeometryTimer) {
+      mUpdatePluginGeometryTimer->
+        InitWithFuncCallback(UpdatePluginGeometryCallback, this,
+                             nsRefreshDriver::DefaultInterval() * 2,
+                             nsITimer::TYPE_ONE_SHOT);
+    }
     mNeedsToUpdatePluginGeometry = true;
     mUpdatePluginGeometryForFrame = aFrame;
     mUpdatePluginGeometryForFrame->PresContext()->

layout/base/nsPresContext.h

@@ -1341,7 +1341,17 @@ protected:
     nsRootPresContext* mPresContext;
   };
 
+  friend class nsPresContext;
+  void CancelUpdatePluginGeometryTimer()
+  {
+    if (mUpdatePluginGeometryTimer) {
+      mUpdatePluginGeometryTimer->Cancel();
+      mUpdatePluginGeometryTimer = nsnull;
+    }
+  }
+
   nsCOMPtr<nsITimer> mNotifyDidPaintTimer;
+  nsCOMPtr<nsITimer> mUpdatePluginGeometryTimer;
   nsTHashtable<nsPtrHashKey<nsObjectFrame> > mRegisteredPlugins;
   // if mNeedsToUpdatePluginGeometry is set, then this is the frame to
   // use as the root of the subtree to search for plugin updates, or

layout/base/nsRefreshDriver.cpp

@@ -74,6 +74,13 @@ nsRefreshDriver::InitializeStatics()
                                "layout.frame_rate.precise",
                                false);
 }
+
+/* static */ PRInt32
+nsRefreshDriver::DefaultInterval()
+{
+  return NSToIntRound(1000.0 / DEFAULT_FRAME_RATE);
+}
+
 // Compute the interval to use for the refresh driver timer, in
 // milliseconds
 PRInt32

layout/base/nsRefreshDriver.h

@@ -238,6 +238,11 @@ public:
 			   mozFlushType aFlushType);
 #endif
 
+  /**
+   * Default interval the refresh driver uses, in ms.
+   */
+  static PRInt32 DefaultInterval();
+
 private:
   typedef nsTObserverArray<nsARefreshObserver*> ObserverArray;
   typedef nsTHashtable<nsISupportsHashKey> RequestTable;