Implement a Hit Test Cache.

Source/core/layout/HitTestLocation.cpp

 /*
  * Copyright (C) 2006, 2008, 2011 Apple Inc. All rights reserved.
  * 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 104 matching lines @@
     m_transformedPoint.move(offset);
     m_transformedRect.move(offset);
     m_boundingBox = enclosingIntRect(m_transformedRect.boundingBox());
 }
 
 template<typename RectType>
 bool HitTestLocation::intersectsRect(const RectType& rect, const RectType& boundingBox) const
 {
     // FIXME: When the hit test is not rect based we should use rect.contains(m_point).
     // That does change some corner case tests though.
-
     // First check if rect even intersects our bounding box.
     if (!rect.intersects(boundingBox))
         return false;
 
     // If the transformed rect is rectilinear the bounding box intersection was accurate.
     if (m_isRectilinear)
         return true;
 
     // If rect fully contains our bounding box, we are also sure of an intersection.
     if (rect.contains(boundingBox))
         return true;
 
     // Otherwise we need to do a slower quad based intersection test.
     return m_transformedRect.intersectsRect(rect);
 }
 
 bool HitTestLocation::intersects(const LayoutRect& rect) const
 {
+    if (!m_isRectBased)
+        return rect.contains(m_point);
+
     return intersectsRect(rect, LayoutRect(m_boundingBox));
 }
 
 bool HitTestLocation::intersects(const FloatRect& rect) const
 {
+    if (!m_isRectBased)
+        return rect.contains(FloatPoint(m_point));
+
     return intersectsRect(rect, FloatRect(m_boundingBox));
 }
 
 bool HitTestLocation::intersects(const FloatRoundedRect& rect) const
 {
     return rect.intersectsQuad(m_transformedRect);
 }
 
 bool HitTestLocation::containsPoint(const FloatPoint& point) const
 {
     return m_transformedRect.containsPoint(point);
 }
 
 IntRect HitTestLocation::rectForPoint(const LayoutPoint& point, unsigned topPadding, unsigned rightPadding, unsigned bottomPadding, unsigned leftPadding)
 {
     IntPoint actualPoint(flooredIntPoint(point));
     actualPoint -= IntSize(leftPadding, topPadding);
 
     IntSize actualPadding(leftPadding + rightPadding, topPadding + bottomPadding);
     // As IntRect is left inclusive and right exclusive (seeing IntRect::contains(x, y)), adding "1".
     // FIXME: Remove this once non-rect based hit-detection stops using IntRect:intersects.
     actualPadding += IntSize(1, 1);
 
     return IntRect(actualPoint, actualPadding);
 }
 
 } // namespace blink