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diff --git a/WebCore/rendering/GapRects.h b/WebCore/rendering/GapRects.h
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+/*
+    This file is part of the KDE libraries
+
+    Copyright (C) 2005, 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,
+    but WITHOUT ANY WARRANTY; without even the implied warranty of
+    MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
+    Library General Public License for more details.
+
+    You should have received a copy of the GNU Library General Public License
+    along with this library; see the file COPYING.LIB.  If not, write to
+    the Free Software Foundation, Inc., 51 Franklin Street, Fifth Floor,
+    Boston, MA 02110-1301, USA.
+
+
+    Some useful definitions needed for laying out elements
+*/
+
+#ifndef GapRects_h
+#define GapRects_h
+
+#include "IntRect.h"
+
+namespace WebCore {
+
+    struct GapRects {
+        const IntRect& left() const { return m_left; }
+        const IntRect& center() const { return m_center; }
+        const IntRect& right() const { return m_right; }
+        
+        void uniteLeft(const IntRect& r) { m_left.unite(r); }
+        void uniteCenter(const IntRect& r) { m_center.unite(r); }
+        void uniteRight(const IntRect& r) { m_right.unite(r); }
+        void unite(const GapRects& o) { uniteLeft(o.left()); uniteCenter(o.center()); uniteRight(o.right()); }
+
+        operator IntRect() const
+        {
+            IntRect result = m_left;
+            result.unite(m_center);
+            result.unite(m_right);
+            return result;
+        }
+
+        bool operator==(const GapRects& other)
+        {
+            return m_left == other.left() && m_center == other.center() && m_right == other.right();
+        }
+        bool operator!=(const GapRects& other) { return !(*this == other); }
+
+    private:
+        IntRect m_left;
+        IntRect m_center;
+        IntRect m_right;
+    };
+
+} // namespace WebCore
+
+#endif // GapRects_h