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// Copyright (C) 2016 The Qt Company Ltd.
// SPDX-License-Identifier: LicenseRef-Qt-Commercial OR LGPL-3.0-only OR GPL-2.0-only OR GPL-3.0-only
#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 <QtWidgets/private/qtwidgetsglobal_p.h>
#include <qlist.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(QList<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.size(); }
inline QList<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(QList<int> &leaf, const QRect &area, uint visited, QBspTreeData data);
static void remove(QList<int> &leaf, const QRect &area, uint visited, QBspTreeData data);
private:
uint depth;
mutable uint visited;
QList<Node> nodes;
mutable QList<QList<int>> leaves; // the leaves are just indices into the items
};
QT_END_NAMESPACE
#endif // QBSPTREE_P_H
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