Bug 976877 - Don't simplify invalidation regions since it leads to poor results. r=roc

gfx/layers/LayerTreeInvalidation.cpp

@@ -59,14 +59,12 @@ AddTransformedRegion(nsIntRegion& aDest, const nsIntRegion& aSource, const gfx3D
   while ((r = iter.Next())) {
     aDest.Or(aDest, TransformRect(*r, aTransform));
   }
-  aDest.SimplifyOutward(4);
 }
 
 static void
 AddRegion(nsIntRegion& aDest, const nsIntRegion& aSource)
 {
   aDest.Or(aDest, aSource);
-  aDest.SimplifyOutward(4);
 }
 
 static nsIntRegion

gfx/layers/basic/BasicThebesLayer.h

@@ -53,7 +53,6 @@ public:
     NS_ASSERTION(BasicManager()->InConstruction(),
                  "Can only set properties in construction phase");
     mInvalidRegion.Or(mInvalidRegion, aRegion);
-    mInvalidRegion.SimplifyOutward(10);
     mValidRegion.Sub(mValidRegion, mInvalidRegion);
   }
 

gfx/layers/client/ClientThebesLayer.h

@@ -60,7 +60,6 @@ public:
     NS_ASSERTION(ClientManager()->InConstruction(),
                  "Can only set properties in construction phase");
     mInvalidRegion.Or(mInvalidRegion, aRegion);
-    mInvalidRegion.SimplifyOutward(10);
     mValidRegion.Sub(mValidRegion, mInvalidRegion);
   }
 

gfx/layers/d3d9/ThebesLayerD3D9.cpp

@@ -52,7 +52,6 @@ void
 ThebesLayerD3D9::InvalidateRegion(const nsIntRegion &aRegion)
 {
   mInvalidRegion.Or(mInvalidRegion, aRegion);
-  mInvalidRegion.SimplifyOutward(10);
   mValidRegion.Sub(mValidRegion, mInvalidRegion);
 }