1/****************************************************************************
2**
3** Copyright (C) 2016 The Qt Company Ltd.
4** Contact: https://www.qt.io/licensing/
5**
6** This file is part of the QtQuick module of the Qt Toolkit.
7**
8** $QT_BEGIN_LICENSE:LGPL$
9** Commercial License Usage
10** Licensees holding valid commercial Qt licenses may use this file in
11** accordance with the commercial license agreement provided with the
12** Software or, alternatively, in accordance with the terms contained in
13** a written agreement between you and The Qt Company. For licensing terms
14** and conditions see https://www.qt.io/terms-conditions. For further
15** information use the contact form at https://www.qt.io/contact-us.
16**
17** GNU Lesser General Public License Usage
18** Alternatively, this file may be used under the terms of the GNU Lesser
19** General Public License version 3 as published by the Free Software
20** Foundation and appearing in the file LICENSE.LGPL3 included in the
21** packaging of this file. Please review the following information to
22** ensure the GNU Lesser General Public License version 3 requirements
23** will be met: https://www.gnu.org/licenses/lgpl-3.0.html.
24**
25** GNU General Public License Usage
26** Alternatively, this file may be used under the terms of the GNU
27** General Public License version 2.0 or (at your option) the GNU General
28** Public license version 3 or any later version approved by the KDE Free
29** Qt Foundation. The licenses are as published by the Free Software
30** Foundation and appearing in the file LICENSE.GPL2 and LICENSE.GPL3
31** included in the packaging of this file. Please review the following
32** information to ensure the GNU General Public License requirements will
33** be met: https://www.gnu.org/licenses/gpl-2.0.html and
34** https://www.gnu.org/licenses/gpl-3.0.html.
35**
36** $QT_END_LICENSE$
37**
38****************************************************************************/
39
40#ifndef QT3DEXTRAS_AREAALLOCATOR_P_H
41#define QT3DEXTRAS_AREAALLOCATOR_P_H
42
43//
44// W A R N I N G
45// -------------
46//
47// This file is not part of the Qt API. It exists purely as an
48// implementation detail. This header file may change from version to
49// version without notice, or even be removed.
50//
51// We mean it.
52//
53
54//
55// This file is copied from qtdeclarative/src/quick/scenegraph/util/qsgareaallocator_p.h
56//
57
58#include <QtCore/qsize.h>
59
60QT_BEGIN_NAMESPACE
61
62class QRect;
63class QPoint;
64
65namespace Qt3DExtras {
66
67struct AreaAllocatorNode;
68
69class AreaAllocator
70{
71public:
72 AreaAllocator(const QSize &size);
73 ~AreaAllocator();
74
75 QRect allocate(const QSize &size);
76 bool deallocate(const QRect &rect);
77 bool isEmpty() const { return m_root == 0; }
78 QSize size() const { return m_size; }
79private:
80 bool allocateInNode(const QSize &size, QPoint &result, const QRect &currentRect, AreaAllocatorNode *node);
81 bool deallocateInNode(const QPoint &pos, AreaAllocatorNode *node);
82 void mergeNodeWithNeighbors(AreaAllocatorNode *node);
83
84 AreaAllocatorNode *m_root;
85 QSize m_size;
86};
87
88} // namespace Qt3DExtras
89
90QT_END_NAMESPACE
91
92#endif // QT3DEXTRAS_AREAALLOCATOR_P_H
93

source code of qt3d/src/extras/text/areaallocator_p.h