Turn styleWillChange |newStyle| into a reference

Source/core/rendering/RenderLayerModelObject.cpp

 /*
  * Copyright (C) 1999 Lars Knoll (knoll@kde.org)
  *           (C) 1999 Antti Koivisto (koivisto@kde.org)
  *           (C) 2005 Allan Sandfeld Jensen (kde@carewolf.com)
  *           (C) 2005, 2006 Samuel Weinig (sam.weinig@gmail.com)
  * Copyright (C) 2005, 2006, 2007, 2008, 2009 Apple Inc. All rights reserved.
  * Copyright (C) 2010, 2012 Google Inc. All rights reserved.
  *
  * This library is free software; you can redistribute it and/or
  * modify it under the terms of the GNU Library General Public
@@ skipping 70 matching lines @@
                     frameView->removeViewportConstrainedObject(this);
             }
         }
     }
 
     RenderObject::willBeDestroyed();
 
     destroyLayer();
 }
 
-void RenderLayerModelObject::styleWillChange(StyleDifference diff, const RenderStyle* newStyle)
+void RenderLayerModelObject::styleWillChange(StyleDifference diff, const RenderStyle& newStyle)
 {
     s_wasFloating = isFloating();
 
     // If our z-index changes value or our visibility changes,
     // we need to dirty our stacking context's z-order list.
     RenderStyle* oldStyle = style();
-    if (oldStyle && newStyle) {
+    if (oldStyle) {
         if (parent()) {
             // Do a repaint with the old style first, e.g., for example if we go from
             // having an outline to not having an outline.
             if (diff == StyleDifferenceRepaintLayer) {
                 layer()->repainter().repaintIncludingDescendants();
-                if (oldStyle->clip() != newStyle->clip())
+                if (oldStyle->clip() != newStyle.clip())
                     layer()->clipper().clearClipRectsIncludingDescendants();
-            } else if (diff == StyleDifferenceRepaint || newStyle->outlineSize() < oldStyle->outlineSize())
+            } else if (diff == StyleDifferenceRepaint || newStyle.outlineSize() < oldStyle->outlineSize())
                 repaint();
         }
 
         if (diff == StyleDifferenceLayout || diff == StyleDifferenceSimplifiedLayout) {
             // When a layout hint happens, we go ahead and do a repaint of the layer, since the layer could
             // end up being destroyed.
             if (hasLayer()) {
-                if (oldStyle->hasClip() != newStyle->hasClip()
-                    || oldStyle->clip() != newStyle->clip()) {
+                if (oldStyle->hasClip() != newStyle.hasClip()
+                    || oldStyle->clip() != newStyle.clip()) {
                     // Composited layers don't need to be repainted when a parent's clip changes.
                     layer()->repainter().repaintIncludingNonCompositingDescendants(containerForRepaint());
                 } else if (!layer()->hasCompositedLayerMapping()) {
-                    if (oldStyle->position() != newStyle->position()
-                        || oldStyle->zIndex() != newStyle->zIndex()
-                        || oldStyle->hasAutoZIndex() != newStyle->hasAutoZIndex()
-                        || oldStyle->opacity() != newStyle->opacity()
-                        || oldStyle->transform() != newStyle->transform()
-                        || oldStyle->filter() != newStyle->filter())
+                    if (oldStyle->position() != newStyle.position()
+                        || oldStyle->zIndex() != newStyle.zIndex()
+                        || oldStyle->hasAutoZIndex() != newStyle.hasAutoZIndex()
+                        || oldStyle->opacity() != newStyle.opacity()
+                        || oldStyle->transform() != newStyle.transform()
+                        || oldStyle->filter() != newStyle.filter())
                     layer()->repainter().repaintIncludingDescendants();
                 }
-            } else if (newStyle->hasTransform() || newStyle->opacity() < 1 || newStyle->hasFilter()) {
+            } else if (newStyle.hasTransform() || newStyle.opacity() < 1 || newStyle.hasFilter()) {
                 // If we don't have a layer yet, but we are going to get one because of transform or opacity,
                 //  then we need to repaint the old position of the object.
                 repaint();
             }
         }
     }
 
     RenderObject::styleWillChange(diff, newStyle);
 }
 
@@ skipping 84 matching lines @@
     return m_layer ? m_layer->hasCompositedLayerMapping() : false;
 }
 
 CompositedLayerMapping* RenderLayerModelObject::groupedMapping() const
 {
     return m_layer ? m_layer->groupedMapping() : 0;
 }
 
 } // namespace WebCore