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

Source/core/rendering/RenderRegionSet.h

Index: Source/core/rendering/RenderRegionSet.h
diff --git a/Source/core/rendering/RenderRegionSet.h b/Source/core/rendering/RenderRegionSet.h
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-/*
- * Copyright (C) 2012 Apple Inc.  All rights reserved.
- *
- * Redistribution and use in source and binary forms, with or without
- * modification, are permitted provided that the following conditions
- * are met:
- * 1. Redistributions of source code must retain the above copyright
- *    notice, this list of conditions and the following disclaimer.
- * 2. Redistributions in binary form must reproduce the above copyright
- *    notice, this list of conditions and the following disclaimer in the
- *    documentation and/or other materials provided with the distribution.
- *
- * THIS SOFTWARE IS PROVIDED BY APPLE INC. ``AS IS'' AND ANY
- * EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
- * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR
- * PURPOSE ARE DISCLAIMED.  IN NO EVENT SHALL APPLE COMPUTER, INC. OR
- * CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL,
- * EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO,
- * PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR
- * PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY
- * OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
- * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
- * OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
- */
-
-
-#ifndef RenderRegionSet_h
-#define RenderRegionSet_h
-
-#include "core/rendering/RenderBoxRegionInfo.h"
-#include "core/rendering/RenderRegion.h"
-
-namespace WebCore {
-
-class RenderFlowThread;
-
-// RenderRegionSet represents a set of regions that all have the same width and height. It is a "composite region box" that
-// can be used to represent a single run of contiguous regions.
-//
-// By combining runs of same-size columns or pages into a single object, we significantly reduce the number of unique RenderObjects
-// required to represent those objects.
-//
-// This class is abstract and is only intended for use by renderers that generate anonymous runs of identical regions, i.e.,
-// columns and printing. RenderMultiColumnSet and RenderPageSet represent runs of columns and pages respectively.
-//
-// FIXME: For now we derive from RenderRegion, but this may change at some point.
-
-class RenderRegionSet : public RenderRegion {
-public:
-    RenderRegionSet(Element*, RenderFlowThread*);
-
-protected:
-    virtual bool shouldHaveAutoLogicalHeight() const OVERRIDE { return false; }
-
-private:
-    virtual void installFlowThread() OVERRIDE FINAL;
-
-    virtual void expandToEncompassFlowThreadContentsIfNeeded() OVERRIDE FINAL;
-
-    virtual const char* renderName() const = 0;
-
-    virtual bool isRenderRegionSet() const OVERRIDE FINAL { return true; }
-};
-
-} // namespace WebCore
-
-#endif // RenderRegionSet_h
-