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

Source/core/rendering/RenderView.h

 /*
  * Copyright (C) 1999 Lars Knoll (knoll@kde.org)
  * Copyright (C) 2006 Apple Computer, Inc.
  *
  * This library is free software; you can redistribute it and/or
  * modify it under the terms of the GNU Library General Public
  * License as published by the Free Software Foundation; either
  * version 2 of the License, or (at your option) any later version.
  *
  * This library is distributed in the hope that it will be useful,
@@ skipping 43 matching lines @@
     virtual LayerType layerTypeRequired() const OVERRIDE { return NormalLayer; }
 
     virtual bool isChildAllowed(RenderObject*, RenderStyle*) const OVERRIDE;
 
     virtual void layout() OVERRIDE;
     virtual void updateLogicalWidth() OVERRIDE;
     virtual void computeLogicalHeight(LayoutUnit logicalHeight, LayoutUnit logicalTop, LogicalExtentComputedValues&) const OVERRIDE;
 
     virtual bool supportsPartialLayout() const OVERRIDE { return true; }
 
-    virtual LayoutUnit availableLogicalHeight(AvailableLogicalHeightType) const OVERRIDE;
-
     // The same as the FrameView's layoutHeight/layoutWidth but with null check guards.
     int viewHeight(ScrollableArea::IncludeScrollbarsInRect scrollbarInclusion = ScrollableArea::ExcludeScrollbars) const;
     int viewWidth(ScrollableArea::IncludeScrollbarsInRect scrollbarInclusion = ScrollableArea::ExcludeScrollbars) const;
     int viewLogicalWidth(ScrollableArea::IncludeScrollbarsInRect scrollbarInclusion = ScrollableArea::ExcludeScrollbars) const
     {
         return style()->isHorizontalWritingMode() ? viewWidth(scrollbarInclusion) : viewHeight(scrollbarInclusion);
     }
     int viewLogicalHeight(ScrollableArea::IncludeScrollbarsInRect scrollbarInclusion = ScrollableArea::ExcludeScrollbars) const;
 
     float zoomFactor() const;
@@ skipping 126 matching lines @@
 
 private:
     virtual void mapLocalToContainer(const RenderLayerModelObject* repaintContainer, TransformState&, MapCoordinatesFlags = ApplyContainerFlip, bool* wasFixed = 0) const OVERRIDE;
     virtual const RenderObject* pushMappingToContainer(const RenderLayerModelObject* ancestorToStopAt, RenderGeometryMap&) const OVERRIDE;
     virtual void mapAbsoluteToLocalPoint(MapCoordinatesFlags, TransformState&) const OVERRIDE;
     virtual bool requiresColumns(int desiredColumnCount) const OVERRIDE;
     virtual void computeSelfHitTestRects(Vector<LayoutRect>&, const LayoutPoint& layerOffset) const OVERRIDE;
 
     void initializeLayoutState(LayoutState&);
 
-    virtual void calcColumnWidth() OVERRIDE;
-    virtual ColumnInfo::PaginationUnit paginationUnit() const OVERRIDE;
-
     bool shouldRepaint(const LayoutRect&) const;
 
     // These functions may only be accessed by LayoutStateMaintainer.
-    bool pushLayoutState(RenderBox* renderer, const LayoutSize& offset, LayoutUnit pageHeight = 0, bool pageHeightChanged = false, ColumnInfo* colInfo = 0)
+    bool pushLayoutState(RenderBox* renderer, const LayoutSize& offset, LayoutUnit pageHeight = 0, bool pageHeightChanged = false)
     {
         // We push LayoutState even if layoutState is disabled because it stores layoutDelta too.
-        if (!doingFullRepaint() || m_layoutState->isPaginated() || renderer->hasColumns() || renderer->flowThreadContainingBlock()
+        if (!doingFullRepaint() || m_layoutState->isPaginated() || renderer->flowThreadContainingBlock()
             || m_layoutState->lineGrid() || (renderer->style()->lineGrid() != RenderStyle::initialLineGrid() && renderer->isRenderBlockFlow())
             || (renderer->isRenderBlock() && toRenderBlock(renderer)->shapeInsideInfo())
             || (m_layoutState->shapeInsideInfo() && renderer->isRenderBlock() && !toRenderBlock(renderer)->allowsShapeInsideInfoSharing(m_layoutState->shapeInsideInfo()->owner()))
             ) {
             pushLayoutStateForCurrentFlowThread(renderer);
-            m_layoutState = new LayoutState(m_layoutState, renderer, offset, pageHeight, pageHeightChanged, colInfo);
+            m_layoutState = new LayoutState(m_layoutState, renderer, offset, pageHeight, pageHeightChanged);
             return true;
         }
         return false;
     }
 
     void popLayoutState()
     {
         LayoutState* state = m_layoutState;
         m_layoutState = state->m_next;
         delete state;
@@ skipping 48 matching lines @@
     unsigned m_renderCounterCount;
 };
 
 DEFINE_RENDER_OBJECT_TYPE_CASTS(RenderView, isRenderView());
 
 // Stack-based class to assist with LayoutState push/pop
 class LayoutStateMaintainer {
     WTF_MAKE_NONCOPYABLE(LayoutStateMaintainer);
 public:
     // ctor to push now
-    LayoutStateMaintainer(RenderView* view, RenderBox* root, LayoutSize offset, bool disableState = false, LayoutUnit pageHeight = 0, bool pageHeightChanged = false, ColumnInfo* colInfo = 0)
+    LayoutStateMaintainer(RenderView* view, RenderBox* root, LayoutSize offset, bool disableState = false, LayoutUnit pageHeight = 0, bool pageHeightChanged = false)
         : m_view(view)
         , m_disabled(disableState)
         , m_didStart(false)
         , m_didEnd(false)
         , m_didCreateLayoutState(false)
     {
-        push(root, offset, pageHeight, pageHeightChanged, colInfo);
+        push(root, offset, pageHeight, pageHeightChanged);
     }
 
     // ctor to maybe push later
     LayoutStateMaintainer(RenderView* view)
         : m_view(view)
         , m_disabled(false)
         , m_didStart(false)
         , m_didEnd(false)
         , m_didCreateLayoutState(false)
     {
     }
 
     ~LayoutStateMaintainer()
     {
         ASSERT(m_didStart == m_didEnd);   // if this fires, it means that someone did a push(), but forgot to pop().
     }
 
-    void push(RenderBox* root, LayoutSize offset, LayoutUnit pageHeight = 0, bool pageHeightChanged = false, ColumnInfo* colInfo = 0)
+    void push(RenderBox* root, LayoutSize offset, LayoutUnit pageHeight = 0, bool pageHeightChanged = false)
     {
         ASSERT(!m_didStart);
         // We push state even if disabled, because we still need to store layoutDelta
-        m_didCreateLayoutState = m_view->pushLayoutState(root, offset, pageHeight, pageHeightChanged, colInfo);
+        m_didCreateLayoutState = m_view->pushLayoutState(root, offset, pageHeight, pageHeightChanged);
         if (m_disabled && m_didCreateLayoutState)
             m_view->disableLayoutState();
         m_didStart = true;
     }
 
     void pop()
     {
         if (m_didStart) {
             ASSERT(!m_didEnd);
             if (m_didCreateLayoutState) {
@@ skipping 31 matching lines @@
         if (m_view)
             m_view->enableLayoutState();
     }
 private:
     RenderView* m_view;
 };
 
 } // namespace WebCore
 
 #endif // RenderView_h