From 5e519a6ad884e07da7d1c52ac7412f2305097041 Mon Sep 17 00:00:00 2001
From: Matt Woodrow <mwoodrow@mozilla.com>
Date: Sat, 30 Jun 2012 15:06:12 +1200
Subject: [PATCH] Bug 539356 - Part 17 - Don't paint widgets that an invisible
 or empty bounds. r=roc * * * Bug 539356 - Part 13 - Only repaint widgets that
 have had changes since the last paint

---
 widget/nsIWidget.h | 12 +++++++++++-
 1 file changed, 11 insertions(+), 1 deletion(-)

diff --git a/widget/nsIWidget.h b/widget/nsIWidget.h
index ac328d1d52d9..4697672d26a3 100644
--- a/widget/nsIWidget.h
+++ b/widget/nsIWidget.h
@@ -1576,7 +1576,17 @@ class nsIWidget : public nsISupports {
       if (!mNeedsPaint) {
         return false;
       }
-      return true;
+
+      bool visible;
+      nsresult rv = IsVisible(visible);
+      NS_ENSURE_SUCCESS(rv, false);
+      if (!visible) {
+        return false;
+      }
+      nsIntRect bounds;
+      rv = GetBounds(bounds);
+      NS_ENSURE_SUCCESS(rv, false);
+      return !bounds.IsEmpty();
     }
 protected: