From 49d82fd22e43457703e2da676b89d53c7d6923fc Mon Sep 17 00:00:00 2001
From: Benoit Girard <b56girard@gmail.com>
Date: Thu, 27 Aug 2015 18:29:37 -0400
Subject: [PATCH] Backout d4985245dfd55ba44e0417c42c956e03d094b0df (bug
 1136766) for talos regression

--HG--
extra : commitid : FLbaQb0zd8o
extra : rebase_source : 2d1a6691cadd24d46da7b65971bcd0818b1f75f6
---
 gfx/layers/composite/LayerManagerComposite.cpp | 6 +-----
 1 file changed, 1 insertion(+), 5 deletions(-)

diff --git a/gfx/layers/composite/LayerManagerComposite.cpp b/gfx/layers/composite/LayerManagerComposite.cpp
index 92042f531922..f218bf2969b5 100644
--- a/gfx/layers/composite/LayerManagerComposite.cpp
+++ b/gfx/layers/composite/LayerManagerComposite.cpp
@@ -226,11 +226,7 @@ LayerManagerComposite::ApplyOcclusionCulling(Layer* aLayer, nsIntRegion& aOpaque
   LayerComposite *composite = aLayer->AsLayerComposite();
   if (!localOpaque.IsEmpty()) {
     nsIntRegion visible = composite->GetShadowVisibleRegion();
-    nsIntRegion afterCulling;
-    afterCulling.Sub(visible, localOpaque);
-    // Intersect the original region with the bounds of the culled region so
-    // that we don't increase the region's complexity.
-    visible.AndWith(afterCulling.GetBounds());
+    visible.Sub(visible, localOpaque);
     composite->SetShadowVisibleRegion(visible);
   }