qsgareaallocator_p.h

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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 QSGAREAALLOCATOR_P_H
#define QSGAREAALLOCATOR_P_H
 
//
//  W A R N I N G
//  -------------
//
// This file is not part of the Qt API.  It exists purely as an
// implementation detail.  This header file may change from version to
// version without notice, or even be removed.
//
// We mean it.
//
 
#include <private/qtquickglobal_p.h>
#include <QtCore/qsize.h>
 
QT_BEGIN_NAMESPACE
 
class QRect;
class QPoint;
struct QSGAreaAllocatorNode;
class Q_QUICK_EXPORT QSGAreaAllocator
{
public:
    QSGAreaAllocator(const QSize &size);
    ~QSGAreaAllocator();
 
    QRect allocate(const QSize &size);
    bool deallocate(const QRect &rect);
    bool isEmpty() const { return m_root == nullptr; }
    QSize size() const { return m_size; }
 
    QByteArray serialize();
    const char *deserialize(const char *data, int size);
 
private:
    bool allocateInNode(const QSize &size, QPoint &result, const QRect &currentRect, QSGAreaAllocatorNode *node);
    bool deallocateInNode(const QPoint &pos, QSGAreaAllocatorNode *node);
    void mergeNodeWithNeighbors(QSGAreaAllocatorNode *node);
 
    QSGAreaAllocatorNode *m_root;
    QSize m_size;
};
 
QT_END_NAMESPACE
 
#endif