/****************************************************************************

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** Copyright (C) 2012 Nokia Corporation and/or its subsidiary(-ies).

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** Contact: Nokia Corporation (qt-info@nokia.com)

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** This file is part of the QtCore module of the Qt Toolkit.

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** This file may be used under the terms of the GNU Lesser General Public

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** appearing in the file LICENSE.LGPL included in the packaging of this

** file. Please review the following information to ensure the GNU Lesser

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** rights. These rights are described in the Nokia Qt LGPL Exception

** version 1.1, included in the file LGPL_EXCEPTION.txt in this package.

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** 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

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** file. Please review the following information to ensure the GNU General

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****************************************************************************/

#ifndef QMATH_H

#define QMATH_H

#include <math.h>

#include <QtCore/qglobal.h>

#ifdef Q_OS_SYMBIAN

#    include <e32math.h>

#endif

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 qFabs(qreal v)

{

#ifdef QT_USE_MATH_H_FLOATS

    if(sizeof(qreal) == sizeof(float))

        return fabsf(float(v));

    else

#endif

        return fabs(v);

}

inline qreal qSin(qreal v)

{

#ifdef Q_OS_SYMBIAN

    TReal sin_v;

    Math::Sin(sin_v, static_cast<TReal>(v));

    return static_cast<qreal>(sin_v);

#else

#    ifdef QT_USE_MATH_H_FLOATS

        if (sizeof(qreal) == sizeof(float))

            return sinf(float(v));

        else

#    endif

            return sin(v);

#endif

}

inline qreal qCos(qreal v)

{

#ifdef Q_OS_SYMBIAN

    TReal cos_v;

    Math::Cos(cos_v, static_cast<TReal>(v));

    return static_cast<qreal>(cos_v);

#else

#    ifdef QT_USE_MATH_H_FLOATS

        if (sizeof(qreal) == sizeof(float))

            return cosf(float(v));

        else

#    endif

            return cos(v);

#endif

}

inline qreal qTan(qreal v)

{

#ifdef Q_OS_SYMBIAN

    TReal tan_v;

    Math::Tan(tan_v, static_cast<TReal>(v));

    return static_cast<qreal>(tan_v);

#else

#    ifdef QT_USE_MATH_H_FLOATS

        if (sizeof(qreal) == sizeof(float))

            return tanf(float(v));

        else

#    endif

            return tan(v);

#endif

}

inline qreal qAcos(qreal v)

{

#ifdef Q_OS_SYMBIAN

    TReal acos_v;

    Math::ACos(acos_v, static_cast<TReal>(v));

    return static_cast<qreal>(acos_v);

#else

#    ifdef QT_USE_MATH_H_FLOATS

        if (sizeof(qreal) == sizeof(float))

            return acosf(float(v));

        else

#    endif

           return acos(v);

#endif

}

inline qreal qAsin(qreal v)

{

#ifdef Q_OS_SYMBIAN

    TReal asin_v;

    Math::ASin(asin_v, static_cast<TReal>(v));

    return static_cast<qreal>(asin_v);

#else

#    ifdef QT_USE_MATH_H_FLOATS

        if (sizeof(qreal) == sizeof(float))

            return asinf(float(v));

        else

#    endif

            return asin(v);

#endif

}

inline qreal qAtan(qreal v)

{

#ifdef Q_OS_SYMBIAN

    TReal atan_v;

    Math::ATan(atan_v, static_cast<TReal>(v));

    return static_cast<qreal>(atan_v);

#else

#    ifdef QT_USE_MATH_H_FLOATS

        if(sizeof(qreal) == sizeof(float))

            return atanf(float(v));

        else

#    endif

            return atan(v);

#endif

}

inline qreal qAtan2(qreal x, qreal y)

{

#ifdef Q_OS_SYMBIAN

    TReal atan2_v;

    Math::ATan(atan2_v, static_cast<TReal>(x), static_cast<TReal>(y));

    return static_cast<qreal>(atan2_v);

#else

#    ifdef QT_USE_MATH_H_FLOATS

        if(sizeof(qreal) == sizeof(float))

            return atan2f(float(x), float(y));

        else

#    endif

            return atan2(x, y);

#endif

}

inline qreal qSqrt(qreal v)

{

#ifdef Q_OS_SYMBIAN

    TReal sqrt_v;

    Math::Sqrt(sqrt_v, static_cast<TReal>(v));

    return static_cast<qreal>(sqrt_v);

#else

#    ifdef QT_USE_MATH_H_FLOATS

        if (sizeof(qreal) == sizeof(float))

            return sqrtf(float(v));

        else

#    endif

            return sqrt(v);

#endif

}

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 qExp(qreal v)

{

#ifdef Q_OS_SYMBIAN

    TReal exp_v;

    Math::Exp(exp_v, static_cast<TReal>(v));

    return static_cast<qreal>(exp_v);

#else

    // only one signature

    // exists, exp(double)

    return exp(v);

#endif

}

inline qreal qPow(qreal x, qreal y)

{

#ifdef Q_OS_SYMBIAN

    TReal pow_v;

    Math::Pow(pow_v, static_cast<TReal>(x), static_cast<TReal>(y));

    return static_cast<qreal>(pow_v);

#else

#    ifdef QT_USE_MATH_H_FLOATS

        if (sizeof(qreal) == sizeof(float))

            return powf(float(x), float(y));

        else

#    endif

            return pow(x, y);

#endif

}

#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