Make RenderObject::style() return a const object

Source/core/rendering/RenderObject.h

 /*
  * Copyright (C) 2000 Lars Knoll (knoll@kde.org)
  *           (C) 2000 Antti Koivisto (koivisto@kde.org)
  *           (C) 2000 Dirk Mueller (mueller@kde.org)
  *           (C) 2004 Allan Sandfeld Jensen (kde@carewolf.com)
  * Copyright (C) 2003, 2004, 2005, 2006, 2007, 2008, 2009, 2012 Apple Inc. All rights reserved.
  * Copyright (C) 2009 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 250 matching lines @@
 
     // Called when an object that was floating or positioned becomes a normal flow object
     // again.  We have to make sure the render tree updates as needed to accommodate the new
     // normal flow object.
     void handleDynamicFloatPositionChange();
 
     // RenderObject tree manipulation
     //////////////////////////////////////////
     virtual bool canHaveChildren() const { return virtualChildren(); }
     virtual bool canHaveGeneratedChildren() const;
-    virtual bool isChildAllowed(RenderObject*, RenderStyle*) const { return true; }
+    virtual bool isChildAllowed(RenderObject*, const RenderStyle*) const { return true; }
     virtual void addChild(RenderObject* newChild, RenderObject* beforeChild = 0);
     virtual void addChildIgnoringContinuation(RenderObject* newChild, RenderObject* beforeChild = 0) { return addChild(newChild, beforeChild); }
     virtual void removeChild(RenderObject*);
     virtual bool createsAnonymousWrapper() const { return false; }
     //////////////////////////////////////////
 
 protected:
     //////////////////////////////////////////
     // Helper functions. Dangerous to use!
     void setPreviousSibling(RenderObject* previous) { m_previous = previous; }
@@ skipping 32 matching lines @@
     void showRenderTreeForThis() const;
     void showLineTreeForThis() const;
 
     void showRenderObject() const;
     // We don't make printedCharacters an optional parameter so that
     // showRenderObject can be called from gdb easily.
     void showRenderObject(int printedCharacters) const;
     void showRenderTreeAndMark(const RenderObject* markedObject1 = 0, const char* markedLabel1 = 0, const RenderObject* markedObject2 = 0, const char* markedLabel2 = 0, int depth = 0) const;
 #endif
 
-    static RenderObject* createObject(Element*, RenderStyle*);
+    static RenderObject* createObject(Element*, const RenderStyle*);
     static unsigned instanceCount() { return s_instanceCount; }
 
 #if !ENABLE(OILPAN)
     // RenderObjects are allocated out of the rendering partition.
     void* operator new(size_t);
     void operator delete(void*);
 #endif
 
 public:
     bool isPseudoElement() const { return node() && node()->isPseudoElement(); }
@@ skipping 261 matching lines @@
     bool hasHiddenBackface() const { return style() && style()->backfaceVisibility() == BackfaceVisibilityHidden; }
 
     bool hasFilter() const { return style() && style()->hasFilter(); }
 
     bool hasShapeOutside() const { return style() && style()->shapeOutside(); }
 
     inline bool preservesNewline() const;
 
     // The pseudo element style can be cached or uncached.  Use the cached method if the pseudo element doesn't respect
     // any pseudo classes (and therefore has no concept of changing state).
-    RenderStyle* getCachedPseudoStyle(PseudoId, RenderStyle* parentStyle = 0) const;
-    PassRefPtr<RenderStyle> getUncachedPseudoStyle(const PseudoStyleRequest&, RenderStyle* parentStyle = 0, RenderStyle* ownStyle = 0) const;
+    RenderStyle* getCachedPseudoStyle(PseudoId, const RenderStyle* parentStyle = 0) const;
+    PassRefPtr<RenderStyle> getUncachedPseudoStyle(const PseudoStyleRequest&, const RenderStyle* parentStyle = 0, const RenderStyle* ownStyle = 0) const;
 
     virtual void updateDragState(bool dragOn);
 
     RenderView* view() const { return document().renderView(); };
     FrameView* frameView() const { return document().view(); };
 
     bool isRooted() const;
 
     Node* node() const
     {
@@ skipping 171 matching lines @@
     virtual IntRect absoluteFocusRingBoundingBoxRect() const;
 
     static FloatRect absoluteBoundingBoxRectForRange(const Range*);
 
     // the rect that will be painted if this object is passed as the paintingRoot
     LayoutRect paintingRootRect(LayoutRect& topLevelRect);
 
     virtual LayoutUnit minPreferredLogicalWidth() const { return 0; }
     virtual LayoutUnit maxPreferredLogicalWidth() const { return 0; }
 
-    RenderStyle* style() const { return m_style.get(); }
+    const RenderStyle* style() const { return m_style.get(); }
+    RenderStyle* deprecatedMutableStyle() const { return m_style.get(); }
 
     /* The two following methods are inlined in RenderObjectInlines.h */
-    RenderStyle* firstLineStyle() const;
-    RenderStyle* style(bool firstLine) const;
+    const RenderStyle* firstLineStyle() const;
+    const RenderStyle* style(bool firstLine) const;
 
     static inline Color resolveColor(const RenderStyle* styleToUse, int colorProperty)
     {
         return styleToUse->visitedDependentColor(colorProperty);
     }
 
     inline Color resolveColor(int colorProperty) const
     {
         return style()->visitedDependentColor(colorProperty);
     }
@@ skipping 803 matching lines @@
 void showTree(const blink::RenderObject*);
 void showLineTree(const blink::RenderObject*);
 void showRenderTree(const blink::RenderObject* object1);
 // We don't make object2 an optional parameter so that showRenderTree
 // can be called from gdb easily.
 void showRenderTree(const blink::RenderObject* object1, const blink::RenderObject* object2);
 
 #endif
 
 #endif // RenderObject_h