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/****************************************************************************
**
** Copyright (C) 2011 Nokia Corporation and/or its subsidiary(-ies).
** All rights reserved.
** Contact: Nokia Corporation (qt-info@nokia.com)
**
** This file is part of the QtQuick3D module of the Qt Toolkit.
**
** $QT_BEGIN_LICENSE:LGPL$
** GNU Lesser General Public License Usage
** 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.
**
** GNU General Public License Usage
** Alternatively, this file may be used under the terms of the GNU General
** Public License version 3.0 as published by the Free Software Foundation
** and appearing in the file LICENSE.GPL included in the packaging of this
** file. Please review the following information to ensure the GNU General
** Public License version 3.0 requirements will be met:
** http://www.gnu.org/copyleft/gpl.html.
**
** Other Usage
** Alternatively, this file may be used in accordance with the terms and
** conditions contained in a signed written agreement between you and Nokia.
**
**
**
**
**
** $QT_END_LICENSE$
**
****************************************************************************/
#ifndef QAREAALLOCATOR_P_H
#define QAREAALLOCATOR_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 "qt3dglobal.h"
#include <QtCore/qsize.h>
#include <QtCore/qrect.h>
#include <QtCore/qlist.h>
QT_BEGIN_HEADER
QT_BEGIN_NAMESPACE
QT_MODULE(Qt3D)
class Q_QT3D_EXPORT QAreaAllocator
{
public:
QAreaAllocator(const QSize &size);
virtual ~QAreaAllocator();
QSize size() const { return m_size; }
QSize minimumAllocation() const { return m_minAlloc; }
void setMinimumAllocation(const QSize &size) { m_minAlloc = size; }
QSize margin() const { return m_margin; }
void setMargin(const QSize &margin) { m_margin = margin; }
virtual void expand(const QSize &size);
void expandBy(const QSize &size);
virtual QRect allocate(const QSize &size) = 0;
virtual QList<QRect> allocate(const QList<QSize> &sizes);
virtual void release(const QRect &rect);
virtual void release(const QList<QRect> &rects);
virtual int overhead() const;
protected:
QSize m_size;
QSize m_minAlloc;
QSize m_margin;
QSize roundAllocation(const QSize &size) const;
};
class Q_QT3D_EXPORT QSimpleAreaAllocator : public QAreaAllocator
{
public:
QSimpleAreaAllocator(const QSize &size);
virtual ~QSimpleAreaAllocator();
QRect allocate(const QSize &size);
private:
int m_row;
int m_column;
int m_rowHeight;
};
class Q_QT3D_EXPORT QGeneralAreaAllocator : public QAreaAllocator
{
public:
QGeneralAreaAllocator(const QSize &size);
virtual ~QGeneralAreaAllocator();
void expand(const QSize &size);
QRect allocate(const QSize &size);
void release(const QRect &rect);
int overhead() const;
private:
enum Split { SplitOnX, SplitOnY };
struct Node
{
QRect rect;
QSize largestFree;
Node *parent;
Node *left;
Node *right;
};
Node *m_root;
int m_nodeCount;
static void freeNode(Node *node);
QPoint allocateFromNode(const QSize &size, Node *node);
Node *splitNode(Node *node, Split split);
static void updateLargestFree(Node *node);
};
class Q_QT3D_EXPORT QUniformAreaAllocator : public QAreaAllocator
{
public:
QUniformAreaAllocator(const QSize &size, const QSize &uniformSize);
virtual ~QUniformAreaAllocator();
QSize uniformSize() const { return m_uniformSize; }
void expand(const QSize &size);
QRect allocate(const QSize &size);
void release(const QRect &rect);
int overhead() const;
private:
QSize m_uniformSize;
QSize m_gridSize;
int *m_grid;
int m_firstFree;
};
QT_END_NAMESPACE
QT_END_HEADER
#endif
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