*** DO NOT LAND *** Attempt to understand Regions complexity

Source/core/rendering/HitTestLocation.h

 /*
  * Copyright (C) 2006 Apple Computer, Inc.
  * Copyright (C) 2012 Nokia Corporation and/or its subsidiary(-ies)
  *
  * 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 20 matching lines @@
 #include "wtf/OwnPtr.h"
 #include "wtf/RefPtr.h"
 
 namespace WebCore {
 
 class Element;
 class Frame;
 class Image;
 class KURL;
 class Node;
-class RenderRegion;
 class Scrollbar;
 
 class HitTestLocation {
 public:
 
     HitTestLocation();
     HitTestLocation(const LayoutPoint&);
     HitTestLocation(const FloatPoint&);
     HitTestLocation(const FloatPoint&, const FloatQuad&);
     // Pass non-zero padding values to perform a rect-based hit test.
     HitTestLocation(const LayoutPoint& centerPoint, unsigned topPadding, unsigned rightPadding, unsigned bottomPadding, unsigned leftPadding);
-    // Make a copy the HitTestLocation in a new region by applying given offset to internal point and area.
-    HitTestLocation(const HitTestLocation&, const LayoutSize& offset, RenderRegion* = 0);
+    // FIXME: is copy + offset still used?
+    HitTestLocation(const HitTestLocation&, const LayoutSize& offset);
     HitTestLocation(const HitTestLocation&);
     ~HitTestLocation();
     HitTestLocation& operator=(const HitTestLocation&);
 
     const LayoutPoint& point() const { return m_point; }
     IntPoint roundedPoint() const { return roundedIntPoint(m_point); }
 
-    RenderRegion* region() const { return m_region; }
-
     // Rect-based hit test related methods.
     bool isRectBasedTest() const { return m_isRectBased; }
     bool isRectilinear() const { return m_isRectilinear; }
     IntRect boundingBox() const { return m_boundingBox; }
 
     static IntRect rectForPoint(const LayoutPoint&, unsigned topPadding, unsigned rightPadding, unsigned bottomPadding, unsigned leftPadding);
     int topPadding() const { return roundedPoint().y() - m_boundingBox.y(); }
     int rightPadding() const { return m_boundingBox.maxX() - roundedPoint().x() - 1; }
     int bottomPadding() const { return m_boundingBox.maxY() - roundedPoint().y() - 1; }
     int leftPadding() const { return roundedPoint().x() - m_boundingBox.x(); }
@@ skipping 10 matching lines @@
     bool intersectsRect(const RectType&) const;
     void move(const LayoutSize& offset);
 
     // This is cached forms of the more accurate point and area below.
     LayoutPoint m_point;
     IntRect m_boundingBox;
 
     FloatPoint m_transformedPoint;
     FloatQuad m_transformedRect;
 
-    RenderRegion* m_region; // The region we're inside.
-
     bool m_isRectBased;
     bool m_isRectilinear;
 };
 
 } // namespace WebCore
 
 #endif // HitTestLocation_h