diff options
Diffstat (limited to 'src/gui/painting/qdatabuffer_p.h')
-rw-r--r-- | src/gui/painting/qdatabuffer_p.h | 145 |
1 files changed, 145 insertions, 0 deletions
diff --git a/src/gui/painting/qdatabuffer_p.h b/src/gui/painting/qdatabuffer_p.h new file mode 100644 index 0000000000..5e50f6e032 --- /dev/null +++ b/src/gui/painting/qdatabuffer_p.h @@ -0,0 +1,145 @@ +/**************************************************************************** +** +** 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 QtGui module of the Qt Toolkit. +** +** $QT_BEGIN_LICENSE:LGPL$ +** No Commercial Usage +** This file contains pre-release code and may not be distributed. +** You may use this file in accordance with the terms and conditions +** contained in the Technology Preview License Agreement accompanying +** this package. +** +** GNU Lesser General Public License Usage +** Alternatively, 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. +** +** If you have questions regarding the use of this file, please contact +** Nokia at qt-info@nokia.com. +** +** +** +** +** +** +** +** +** $QT_END_LICENSE$ +** +****************************************************************************/ + +#ifndef QDATABUFFER_P_H +#define QDATABUFFER_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 "QtCore/qbytearray.h" + +QT_BEGIN_NAMESPACE + +template <typename Type> class QDataBuffer +{ +public: + QDataBuffer(int res) + { + capacity = res; + if (res) + buffer = (Type*) qMalloc(capacity * sizeof(Type)); + else + buffer = 0; + siz = 0; + } + + ~QDataBuffer() + { + if (buffer) + qFree(buffer); + } + + inline void reset() { siz = 0; } + + inline bool isEmpty() const { return siz==0; } + + inline int size() const { return siz; } + inline Type *data() const { return buffer; } + + inline Type &at(int i) { Q_ASSERT(i >= 0 && i < siz); return buffer[i]; } + inline const Type &at(int i) const { Q_ASSERT(i >= 0 && i < siz); return buffer[i]; } + inline Type &last() { Q_ASSERT(!isEmpty()); return buffer[siz-1]; } + inline const Type &last() const { Q_ASSERT(!isEmpty()); return buffer[siz-1]; } + inline Type &first() { Q_ASSERT(!isEmpty()); return buffer[0]; } + inline const Type &first() const { Q_ASSERT(!isEmpty()); return buffer[0]; } + + inline void add(const Type &t) { + reserve(siz + 1); + buffer[siz] = t; + ++siz; + } + + inline void pop_back() { + Q_ASSERT(siz > 0); + --siz; + } + + inline void resize(int size) { + reserve(size); + siz = size; + } + + inline void reserve(int size) { + if (size > capacity) { + if (capacity == 0) + capacity = 1; + while (capacity < size) + capacity *= 2; + buffer = (Type*) qRealloc(buffer, capacity * sizeof(Type)); + } + } + + inline void shrink(int size) { + capacity = size; + if (size) + buffer = (Type*) qRealloc(buffer, capacity * sizeof(Type)); + else { + qFree(buffer); + buffer = 0; + } + } + + inline void swap(QDataBuffer<Type> &other) { + qSwap(capacity, other.capacity); + qSwap(siz, other.siz); + qSwap(buffer, other.buffer); + } + + inline QDataBuffer &operator<<(const Type &t) { add(t); return *this; } + +private: + int capacity; + int siz; + Type *buffer; +}; + +QT_END_NAMESPACE + +#endif // QDATABUFFER_P_H |