src/gui/painting/qdatabuffer_p.h
author Dremov Kirill (Nokia-D-MSW/Tampere) <kirill.dremov@nokia.com>
Fri, 19 Feb 2010 23:40:16 +0200
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Revision: 201003 Kit: 201007
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/****************************************************************************
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**
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** Copyright (C) 2010 Nokia Corporation and/or its subsidiary(-ies).
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** All rights reserved.
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** Contact: Nokia Corporation (qt-info@nokia.com)
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**
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** This file is part of the QtGui module of the Qt Toolkit.
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**
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** $QT_BEGIN_LICENSE:LGPL$
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** No Commercial Usage
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** This file contains pre-release code and may not be distributed.
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** You may use this file in accordance with the terms and conditions
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** contained in the Technology Preview License Agreement accompanying
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** this package.
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**
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** GNU Lesser General Public License Usage
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** Alternatively, this file may be used under the terms of the GNU Lesser
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** General Public License version 2.1 as published by the Free Software
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** Foundation and appearing in the file LICENSE.LGPL included in the
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** packaging of this file.  Please review the following information to
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** ensure the GNU Lesser General Public License version 2.1 requirements
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** will be met: http://www.gnu.org/licenses/old-licenses/lgpl-2.1.html.
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**
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** In addition, as a special exception, Nokia gives you certain additional
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** rights.  These rights are described in the Nokia Qt LGPL Exception
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** version 1.1, included in the file LGPL_EXCEPTION.txt in this package.
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**
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** If you have questions regarding the use of this file, please contact
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** Nokia at qt-info@nokia.com.
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**
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**
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**
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**
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**
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**
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**
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**
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** $QT_END_LICENSE$
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**
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****************************************************************************/
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#ifndef QDATABUFFER_P_H
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#define QDATABUFFER_P_H
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//
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//  W A R N I N G
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//  -------------
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//
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// This file is not part of the Qt API.  It exists for the convenience
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// of other Qt classes.  This header file may change from version to
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// version without notice, or even be removed.
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//
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// We mean it.
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//
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#include "QtCore/qbytearray.h"
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QT_BEGIN_NAMESPACE
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template <typename Type> class QDataBuffer
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{
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public:
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    QDataBuffer(int res = 64)
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    {
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        capacity = res;
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        buffer = (Type*) qMalloc(capacity * sizeof(Type));
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        siz = 0;
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    }
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    ~QDataBuffer()
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    {
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        qFree(buffer);
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    }
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    inline void reset() { siz = 0; }
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    inline bool isEmpty() const { return siz==0; }
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    inline int size() const { return siz; }
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    inline Type *data() const { return buffer; }
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    inline Type &at(int i) { Q_ASSERT(i >= 0 && i < siz); return buffer[i]; }
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    inline const Type &at(int i) const { Q_ASSERT(i >= 0 && i < siz); return buffer[i]; }
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    inline const Type &last() const { Q_ASSERT(!isEmpty()); return buffer[siz-1]; }
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    inline const Type &first() const { Q_ASSERT(!isEmpty()); return buffer[0]; }
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    inline void add(const Type &t) {
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        reserve(siz + 1);
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        buffer[siz] = t;
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        ++siz;
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    }
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    inline void resize(int size) {
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        reserve(size);
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        siz = size;
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    }
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    inline void reserve(int size) {
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        if (size > capacity) {
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            while (capacity < size)
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                capacity *= 2;
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            buffer = (Type*) qRealloc(buffer, capacity * sizeof(Type));
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        }
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    }
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    inline void shrink(int size) {
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        capacity = size;
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        buffer = (Type*) qRealloc(buffer, capacity * sizeof(Type));
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    }
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    inline void swap(QDataBuffer<Type> &other) {
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        qSwap(capacity, other.capacity);
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        qSwap(siz, other.siz);
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        qSwap(buffer, other.buffer);
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    }
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    inline QDataBuffer &operator<<(const Type &t) { add(t); return *this; }
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private:
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    int capacity;
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    int siz;
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    Type *buffer;
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};
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QT_END_NAMESPACE
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#endif // QDATABUFFER_P_H