Translate flow thread coords to the nearest enclosing coord space when appropriate.

third_party/WebKit/Source/core/layout/LayoutObject.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 1143 matching lines @@
     // The output rect is suitable for purposes such as paint invalidation.
     //
     // If visualRectFlags has the EdgeInclusive bit set, clipping operations will use
     // LayoutRect::inclusiveIntersect, and the return value of inclusiveIntersect will be propagated
     // to the return value of this method.  Otherwise, clipping operations will use LayoutRect::intersect,
     // and the return value will be true only if the clipped rect has non-zero area.
     // See the documentation for LayoutRect::inclusiveIntersect for more information.
     virtual bool mapToVisualRectInAncestorSpace(const LayoutBoxModelObject* ancestor, LayoutRect&, VisualRectFlags = DefaultVisualRectFlags) const;
 
     // Return the offset to the column in which the specified point (in flow-thread coordinates)
-    // lives. This is used to convert a flow-thread point to a visual point.
+    // lives. This is used to convert a flow-thread point to a point in the containing coordinate space.
     virtual LayoutSize columnOffset(const LayoutPoint&) const { return LayoutSize(); }
 
     virtual unsigned length() const { return 1; }
 
     bool isFloatingOrOutOfFlowPositioned() const { return (isFloating() || isOutOfFlowPositioned()); }
 
     bool isTransparent() const { return style()->hasOpacity(); }
     float opacity() const { return style()->opacity(); }
 
     bool hasReflection() const { return m_bitfields.hasReflection(); }
@@ skipping 1000 matching lines @@
 void showTree(const blink::LayoutObject*);
 void showLineTree(const blink::LayoutObject*);
 void showLayoutTree(const blink::LayoutObject* object1);
 // We don't make object2 an optional parameter so that showLayoutTree
 // can be called from gdb easily.
 void showLayoutTree(const blink::LayoutObject* object1, const blink::LayoutObject* object2);
 
 #endif
 
 #endif // LayoutObject_h