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/****************************************************************************
**
** Copyright (C) 2009 Nokia Corporation and/or its subsidiary(-ies).
** All rights reserved.
** Contact: Nokia Corporation (qt-info@nokia.com)
**
** This file is part of the QtCore 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 QMATH_H
#define QMATH_H
#include <math.h>
#include <QtCore/qglobal.h>
QT_BEGIN_HEADER
QT_BEGIN_NAMESPACE
QT_MODULE(Core)
#define QT_SINE_TABLE_SIZE 256
extern Q_CORE_EXPORT const qreal qt_sine_table[QT_SINE_TABLE_SIZE];
inline int qCeil(qreal v)
{
#ifdef QT_USE_MATH_H_FLOATS
if (sizeof(qreal) == sizeof(float))
return int(ceilf(float(v)));
else
#endif
return int(ceil(v));
}
inline int qFloor(qreal v)
{
#ifdef QT_USE_MATH_H_FLOATS
if (sizeof(qreal) == sizeof(float))
return int(floorf(float(v)));
else
#endif
return int(floor(v));
}
inline qreal qSin(qreal v)
{
#ifdef QT_USE_MATH_H_FLOATS
if (sizeof(qreal) == sizeof(float))
return sinf(float(v));
else
#endif
return sin(v);
}
inline qreal qCos(qreal v)
{
#ifdef QT_USE_MATH_H_FLOATS
if (sizeof(qreal) == sizeof(float))
return cosf(float(v));
else
#endif
return cos(v);
}
inline qreal qAcos(qreal v)
{
#ifdef QT_USE_MATH_H_FLOATS
if (sizeof(qreal) == sizeof(float))
return acosf(float(v));
else
#endif
return acos(v);
}
inline qreal qSqrt(qreal v)
{
#ifdef QT_USE_MATH_H_FLOATS
if (sizeof(qreal) == sizeof(float))
return sqrtf(float(v));
else
#endif
return sqrt(v);
}
inline qreal qLn(qreal v)
{
#ifdef QT_USE_MATH_H_FLOATS
if (sizeof(qreal) == sizeof(float))
return logf(float(v));
else
#endif
return log(v);
}
inline qreal qPow(qreal x, qreal y)
{
#ifdef QT_USE_MATH_H_FLOATS
if (sizeof(qreal) == sizeof(float))
return powf(float(x), float(y));
else
#endif
return pow(x, y);
}
#ifndef M_PI
#define M_PI (3.14159265358979323846)
#endif
inline qreal qFastSin(qreal x)
{
int si = int(x * (0.5 * QT_SINE_TABLE_SIZE / M_PI)); // Would be more accurate with qRound, but slower.
qreal d = x - si * (2.0 * M_PI / QT_SINE_TABLE_SIZE);
int ci = si + QT_SINE_TABLE_SIZE / 4;
si &= QT_SINE_TABLE_SIZE - 1;
ci &= QT_SINE_TABLE_SIZE - 1;
return qt_sine_table[si] + (qt_sine_table[ci] - 0.5 * qt_sine_table[si] * d) * d;
}
inline qreal qFastCos(qreal x)
{
int ci = int(x * (0.5 * QT_SINE_TABLE_SIZE / M_PI)); // Would be more accurate with qRound, but slower.
qreal d = x - ci * (2.0 * M_PI / QT_SINE_TABLE_SIZE);
int si = ci + QT_SINE_TABLE_SIZE / 4;
si &= QT_SINE_TABLE_SIZE - 1;
ci &= QT_SINE_TABLE_SIZE - 1;
return qt_sine_table[si] - (qt_sine_table[ci] + 0.5 * qt_sine_table[si] * d) * d;
}
QT_END_NAMESPACE
QT_END_HEADER
#endif // QMATH_H
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