diff -r 000000000000 -r 1918ee327afb src/gui/itemviews/qbsptree_p.h
--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/src/gui/itemviews/qbsptree_p.h	Mon Jan 11 14:00:40 2010 +0000
@@ -0,0 +1,119 @@
+/****************************************************************************
+**
+** Copyright (C) 2009 Nokia Corporation and/or its subsidiary(-ies).
+** All rights reserved.
+** Contact: Nokia Corporation (qt-info@nokia.com)
+**
+** This file is part of the QtGui module of the Qt Toolkit.
+**
+** $QT_BEGIN_LICENSE:LGPL$
+** No Commercial Usage
+** This file contains pre-release code and may not be distributed.
+** You may use this file in accordance with the terms and conditions
+** contained in the Technology Preview License Agreement accompanying
+** this package.
+**
+** GNU Lesser General Public License Usage
+** Alternatively, this file may be used under the terms of the GNU Lesser
+** General Public License version 2.1 as published by the Free Software
+** Foundation and appearing in the file LICENSE.LGPL included in the
+** packaging of this file.  Please review the following information to
+** ensure the GNU Lesser General Public License version 2.1 requirements
+** will be met: http://www.gnu.org/licenses/old-licenses/lgpl-2.1.html.
+**
+** In addition, as a special exception, Nokia gives you certain additional
+** rights.  These rights are described in the Nokia Qt LGPL Exception
+** version 1.1, included in the file LGPL_EXCEPTION.txt in this package.
+**
+** If you have questions regarding the use of this file, please contact
+** Nokia at qt-info@nokia.com.
+**
+**
+**
+**
+**
+**
+**
+**
+** $QT_END_LICENSE$
+**
+****************************************************************************/
+
+#ifndef QBSPTREE_P_H
+#define QBSPTREE_P_H
+
+//
+//  W A R N I N G
+//  -------------
+//
+// This file is not part of the Qt API.  It exists for the convenience
+// of other Qt classes.  This header file may change from version to
+// version without notice, or even be removed.
+//
+// We mean it.
+//
+
+#include <qvector.h>
+#include <qrect.h>
+
+QT_BEGIN_NAMESPACE
+
+class QBspTree
+{
+public:
+
+    struct Node
+    {
+        enum Type { None = 0, VerticalPlane = 1, HorizontalPlane = 2, Both = 3 };
+        inline Node() : pos(0), type(None) {}
+        int pos;
+        Type type;
+    };
+    typedef Node::Type NodeType;
+
+    struct Data
+    {
+        Data(void *p) : ptr(p) {}
+        Data(int n) : i(n) {}
+        union {
+            void *ptr;
+            int i;
+        };
+    };
+    typedef QBspTree::Data QBspTreeData;
+    typedef void callback(QVector<int> &leaf, const QRect &area, uint visited, QBspTreeData data);
+
+    QBspTree();
+
+    void create(int n, int d = -1);
+    void destroy();
+
+    inline void init(const QRect &area, NodeType type) { init(area, depth, type, 0); }
+
+    void climbTree(const QRect &rect, callback *function, QBspTreeData data);
+
+    inline int leafCount() const { return leaves.count(); }
+    inline QVector<int> &leaf(int i) { return leaves[i]; }
+    inline void insertLeaf(const QRect &r, int i) { climbTree(r, &insert, i, 0); }
+    inline void removeLeaf(const QRect &r, int i) { climbTree(r, &remove, i, 0); }
+
+protected:
+    void init(const QRect &area, int depth, NodeType type, int index);
+    void climbTree(const QRect &rect, callback *function, QBspTreeData data, int index);
+
+    inline int parentIndex(int i) const { return (i & 1) ? ((i - 1) / 2) : ((i - 2) / 2); }
+    inline int firstChildIndex(int i) const { return ((i * 2) + 1); }
+
+    static void insert(QVector<int> &leaf, const QRect &area, uint visited, QBspTreeData data);
+    static void remove(QVector<int> &leaf, const QRect &area, uint visited, QBspTreeData data);
+
+private:
+    uint depth;
+    mutable uint visited;
+    QVector<Node> nodes;
+    mutable QVector< QVector<int> > leaves; // the leaves are just indices into the items
+};
+
+QT_END_NAMESPACE
+
+#endif // QBSPTREE_P_H