Optimize for horizontal writing mode

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 512 matching lines @@
     bool isOutOfFlowPositioned() const { return m_bitfields.isOutOfFlowPositioned(); } // absolute or fixed positioning
     bool isRelPositioned() const { return m_bitfields.isRelPositioned(); } // relative positioning
     bool isPositioned() const { return m_bitfields.isPositioned(); }
 
     bool isText() const  { return m_bitfields.isText(); }
     bool isBox() const { return m_bitfields.isBox(); }
     bool isInline() const { return m_bitfields.isInline(); } // inline object
     bool isDragging() const { return m_bitfields.isDragging(); }
     bool isReplaced() const { return m_bitfields.isReplaced(); } // a "replaced" element (see CSS)
     bool isHorizontalWritingMode() const { return m_bitfields.horizontalWritingMode(); }
+    bool hasFlippedBlocksWritingMode() const
+    {
+        return document().containsAnyRareWritingMode()
+            && style()->slowIsFlippedBlocksWritingMode();
+    }
 
     bool hasLayer() const { return m_bitfields.hasLayer(); }
 
     // "Box decoration background" includes all box decorations and backgrounds
     // that are painted as the background of the object. It includes borders,
     // box-shadows, background-color and background-image, etc.
     enum BoxDecorationBackgroundState {
         NoBoxDecorationBackground,
         HasBoxDecorationBackgroundObscurationStatusInvalid,
         HasBoxDecorationBackgroundKnownToBeObscured,
@@ skipping 494 matching lines @@
     bool shouldCheckForPaintInvalidation(const PaintInvalidationState& paintInvalidationState) const
     {
         return paintInvalidationState.forceCheckForPaintInvalidation() || shouldCheckForPaintInvalidationRegardlessOfPaintInvalidationState();
     }
 
     bool shouldCheckForPaintInvalidationRegardlessOfPaintInvalidationState() const
     {
         return layoutDidGetCalledSinceLastFrame() || mayNeedPaintInvalidation() || shouldDoFullPaintInvalidation() || shouldInvalidateSelection();
     }
 
-    bool supportsPaintInvalidationStateCachedOffsets() const { return !hasColumns() && !hasTransformRelatedProperty() && !hasReflection() && !style()->isFlippedBlocksWritingMode(); }
+    bool supportsPaintInvalidationStateCachedOffsets() const { return !hasColumns() && !hasTransformRelatedProperty() && !hasReflection() && !style()->slowIsFlippedBlocksWritingMode(); }
 
     void setNeedsOverflowRecalcAfterStyleChange();
     void markContainingBlocksForOverflowRecalc();
 
     virtual LayoutRect viewRect() const;
 
 protected:
     enum RenderObjectType {
         RenderObjectBr,
         RenderObjectCanvas,
@@ skipping 552 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