*** DO NOT LAND *** Measure the size and complexity of the old multicol implementation.

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 385 matching lines @@
     inline bool isAfterContent() const;
     inline bool isBeforeOrAfterContent() const;
     static inline bool isAfterContent(const RenderObject* obj) { return obj && obj->isAfterContent(); }
 
     bool hasCounterNodeMap() const { return m_bitfields.hasCounterNodeMap(); }
     void setHasCounterNodeMap(bool hasCounterNodeMap) { m_bitfields.setHasCounterNodeMap(hasCounterNodeMap); }
     bool everHadLayout() const { return m_bitfields.everHadLayout(); }
 
     bool childrenInline() const { return m_bitfields.childrenInline(); }
     void setChildrenInline(bool b) { m_bitfields.setChildrenInline(b); }
-    bool hasColumns() const { return m_bitfields.hasColumns(); }
-    void setHasColumns(bool b = true) { m_bitfields.setHasColumns(b); }
 
     bool ancestorLineBoxDirty() const { return m_bitfields.ancestorLineBoxDirty(); }
     void setAncestorLineBoxDirty(bool value = true)
     {
         m_bitfields.setAncestorLineBoxDirty(value);
         if (value)
             setNeedsLayout();
     }
 
     enum FlowThreadState {
@@ skipping 71 matching lines @@
     bool isAnonymousBlock() const
     {
         // This function is kept in sync with anonymous block creation conditions in
         // RenderBlock::createAnonymousBlock(). This includes creating an anonymous
         // RenderBlock having a BLOCK or BOX display. Other classes such as RenderTextFragment
         // are not RenderBlocks and will return false. See https://bugs.webkit.org/show_bug.cgi?id=56709.
         return isAnonymous() && (style()->display() == BLOCK || style()->display() == BOX) && style()->styleType() == NOPSEUDO && isRenderBlock() && !isListMarker() && !isRenderFlowThread()
             && !isRenderFullScreen()
             && !isRenderFullScreenPlaceholder();
     }
-    bool isAnonymousColumnsBlock() const { return style()->specifiesColumns() && isAnonymousBlock(); }
-    bool isAnonymousColumnSpanBlock() const { return style()->columnSpan() && isAnonymousBlock(); }
     bool isElementContinuation() const { return node() && node()->renderer() != this; }
     bool isInlineElementContinuation() const { return isElementContinuation() && isInline(); }
     virtual RenderBoxModelObject* virtualContinuation() const { return 0; }
 
     bool isFloating() const { return m_bitfields.floating(); }
 
     bool isOutOfFlowPositioned() const { return m_bitfields.isOutOfFlowPositioned(); } // absolute or fixed positioning
     bool isInFlowPositioned() const { return m_bitfields.isRelPositioned() || m_bitfields.isStickyPositioned(); } // relative or sticky positioning
     bool isRelPositioned() const { return m_bitfields.isRelPositioned(); } // relative positioning
     bool isStickyPositioned() const { return m_bitfields.isStickyPositioned(); }
@@ skipping 318 matching lines @@
     IntRect pixelSnappedAbsoluteClippedOverflowRect() const;
     virtual LayoutRect clippedOverflowRectForRepaint(const RenderLayerModelObject* repaintContainer) const;
     virtual LayoutRect rectWithOutlineForRepaint(const RenderLayerModelObject* repaintContainer, LayoutUnit outlineWidth) const;
     virtual LayoutRect outlineBoundsForRepaint(const RenderLayerModelObject* /*repaintContainer*/, const RenderGeometryMap* = 0) const { return LayoutRect(); }
 
     // Given a rect in the object's coordinate space, compute a rect suitable for repainting
     // that rect in the coordinate space of repaintContainer.
     virtual void computeRectForRepaint(const RenderLayerModelObject* repaintContainer, LayoutRect&, bool fixed = false) const;
     virtual void computeFloatRectForRepaint(const RenderLayerModelObject* repaintContainer, FloatRect& repaintRect, bool fixed = false) const;
 
-    // If multiple-column layout results in applying an offset to the given point, add the same
-    // offset to the given size.
-    virtual void adjustForColumns(LayoutSize&, const LayoutPoint&) const { }
-    LayoutSize offsetForColumns(const LayoutPoint& point) const
-    {
-        LayoutSize offset;
-        adjustForColumns(offset, point);
-        return offset;
-    }
-
     virtual unsigned int length() const { return 1; }
 
     bool isFloatingOrOutOfFlowPositioned() const { return (isFloating() || isOutOfFlowPositioned()); }
 
     bool isTransparent() const { return style()->opacity() < 1.0f; }
     float opacity() const { return style()->opacity(); }
 
     bool hasReflection() const { return m_bitfields.hasReflection(); }
 
     // Applied as a "slop" to dirty rect checks during the outline painting phase's dirty-rect checks.
@@ skipping 261 matching lines @@
             , m_horizontalWritingMode(true)
             , m_isDragging(false)
             , m_hasLayer(false)
             , m_hasOverflowClip(false)
             , m_hasTransform(false)
             , m_hasReflection(false)
             , m_hasCounterNodeMap(false)
             , m_everHadLayout(false)
             , m_ancestorLineBoxDirty(false)
             , m_childrenInline(false)
-            , m_hasColumns(false)
             , m_layoutDidGetCalled(false)
             , m_positionedState(IsStaticallyPositioned)
             , m_selectionState(SelectionNone)
             , m_flowThreadState(NotInsideFlowThread)
             , m_boxDecorationState(NoBoxDecorations)
             , m_hasPendingResourceUpdate(false)
         {
         }
 
         // 32 bits have been used in the first word, and 3 in the second.
@@ skipping 19 matching lines @@
         ADD_BOOLEAN_BITFIELD(hasOverflowClip, HasOverflowClip); // Set in the case of overflow:auto/scroll/hidden
         ADD_BOOLEAN_BITFIELD(hasTransform, HasTransform);
         ADD_BOOLEAN_BITFIELD(hasReflection, HasReflection);
 
         ADD_BOOLEAN_BITFIELD(hasCounterNodeMap, HasCounterNodeMap);
         ADD_BOOLEAN_BITFIELD(everHadLayout, EverHadLayout);
         ADD_BOOLEAN_BITFIELD(ancestorLineBoxDirty, AncestorLineBoxDirty);
 
         // from RenderBlock
         ADD_BOOLEAN_BITFIELD(childrenInline, ChildrenInline);
-        ADD_BOOLEAN_BITFIELD(hasColumns, HasColumns);
 
         ADD_BOOLEAN_BITFIELD(layoutDidGetCalled, LayoutDidGetCalled);
 
     private:
         unsigned m_positionedState : 2; // PositionedState
         unsigned m_selectionState : 3; // SelectionState
         unsigned m_flowThreadState : 2; // FlowThreadState
         unsigned m_boxDecorationState : 2; // BoxDecorationState
 
     public:
@@ skipping 236 matching lines @@
 void showTree(const WebCore::RenderObject*);
 void showLineTree(const WebCore::RenderObject*);
 void showRenderTree(const WebCore::RenderObject* object1);
 // We don't make object2 an optional parameter so that showRenderTree
 // can be called from gdb easily.
 void showRenderTree(const WebCore::RenderObject* object1, const WebCore::RenderObject* object2);
 
 #endif
 
 #endif // RenderObject_h