KisFixedPoint Class Reference

#include <kis_fixed_point_maths.h>

Inheritance diagram for KisFixedPoint:

Public Member Functions
KisFixedPoint &	dec256Frac ()
KisFixedPoint &	from256Frac (qint32 v)
KisFixedPoint &	inc256Frac ()
bool	isInteger () const
	KisFixedPoint ()
	KisFixedPoint (int iValue)
	KisFixedPoint (qreal fValue)
KisFixedPoint &	operator*= (const KisFixedPoint &x)
KisFixedPoint &	operator+= (const KisFixedPoint &x)
KisFixedPoint &	operator-= (const KisFixedPoint &x)
KisFixedPoint &	operator/= (const KisFixedPoint &x)
bool	operator< (const KisFixedPoint &x) const
bool	operator== (const KisFixedPoint &x) const
qint32	to256Frac () const
qreal	toFloat () const
qint32	toInt () const
qint32	toIntCeil () const
qint32	toIntFloor () const
qint32	toIntRound () const

Private Attributes
qint32	d

Friends
KisFixedPoint	operator- (KisFixedPoint x)
QDebug	operator<< (QDebug dbg, const KisFixedPoint &v)

Detailed Description

Definition at line 13 of file kis_fixed_point_maths.h.

Constructor & Destructor Documentation

KisFixedPoint() [1/3]

KisFixedPoint::KisFixedPoint ( )

inline

Definition at line 16 of file kis_fixed_point_maths.h.

        : d(0){};

KisFixedPoint() [2/3]

KisFixedPoint::KisFixedPoint ( int iValue )

inline

Definition at line 19 of file kis_fixed_point_maths.h.

        : d(iValue * 256)
    {
    }

KisFixedPoint() [3/3]

KisFixedPoint::KisFixedPoint ( qreal fValue )

inline

Definition at line 24 of file kis_fixed_point_maths.h.

        : d(static_cast<int>(fValue * 256))
    {
    }

Member Function Documentation

dec256Frac()

KisFixedPoint & KisFixedPoint::dec256Frac ( )

inline

Definition at line 63 of file kis_fixed_point_maths.h.

                                {
        d--;
        return *this;
    }

References d.

from256Frac()

KisFixedPoint & KisFixedPoint::from256Frac ( qint32 v )

inline

Definition at line 49 of file kis_fixed_point_maths.h.

                                         {
        d = v;
        return *this;
    }

References d, and v.

inc256Frac()

KisFixedPoint & KisFixedPoint::inc256Frac ( )

inline

Definition at line 58 of file kis_fixed_point_maths.h.

                                {
        d++;
        return *this;
    }

References d.

isInteger()

bool KisFixedPoint::isInteger ( ) const

inline

Definition at line 68 of file kis_fixed_point_maths.h.

                           {
        return !(d & ((1 << 8) -1 ));
    }

References d.

operator*=()

KisFixedPoint & KisFixedPoint::operator*= ( const KisFixedPoint & x )

inline

Until C++20 d >>= 8 is "implementation defined" for negative d. But we have a unittest that confirms that the our compiler handles that in an expected way

Definition at line 90 of file kis_fixed_point_maths.h.

    {
        d *= x.d;
        d >>= 8;
        return *this;
    }

References d.

operator+=()

KisFixedPoint & KisFixedPoint::operator+= ( const KisFixedPoint & x )

inline

Definition at line 80 of file kis_fixed_point_maths.h.

                                                      {
        d += x.d;
        return *this;
    }

References d.

operator-=()

KisFixedPoint & KisFixedPoint::operator-= ( const KisFixedPoint & x )

inline

Definition at line 85 of file kis_fixed_point_maths.h.

                                                      {
        d -= x.d;
        return *this;
    }

References d.

operator/=()

KisFixedPoint & KisFixedPoint::operator/= ( const KisFixedPoint & x )

inline

Until C++20 d <<= 8 is an "undefined behavior" for negative d. But we have a unittest that confirms that the our compiler handles that in an expected way

Definition at line 103 of file kis_fixed_point_maths.h.

    {
        d *= 256;
        d /= x.d;
        return *this;
    }

References d.

operator<()

bool KisFixedPoint::operator< ( const KisFixedPoint & x ) const

inline

Definition at line 72 of file kis_fixed_point_maths.h.

                                                 {
        return d < x.d;
    }

References d.

operator==()

bool KisFixedPoint::operator== ( const KisFixedPoint & x ) const

inline

Definition at line 76 of file kis_fixed_point_maths.h.

                                                  {
        return d == x.d;
    }

References d.

to256Frac()

qint32 KisFixedPoint::to256Frac ( ) const

inline

Definition at line 54 of file kis_fixed_point_maths.h.

                             {
        return d;
    }

References d.

toFloat()

qreal KisFixedPoint::toFloat ( ) const

inline

Definition at line 45 of file kis_fixed_point_maths.h.

                          {
        return qreal(d) / qreal(1 << 8);
    }

References d.

toInt()

qint32 KisFixedPoint::toInt ( ) const

inline

Definition at line 29 of file kis_fixed_point_maths.h.

                         {
        return d >= 0 ? d >> 8 : -((-d) >> 8);
    }

References d.

toIntCeil()

qint32 KisFixedPoint::toIntCeil ( ) const

inline

Definition at line 37 of file kis_fixed_point_maths.h.

                             {
        return d >= 0 ? (d + ((1 << 8) - 1)) >> 8 : -((-d) >> 8);
    }

References d.

toIntFloor()

qint32 KisFixedPoint::toIntFloor ( ) const

inline

Definition at line 41 of file kis_fixed_point_maths.h.

                              {
        return d >= 0 ? d >> 8 : -((-d + ((1 << 8) - 1)) >> 8);
    }

References d.

toIntRound()

qint32 KisFixedPoint::toIntRound ( ) const

inline

Definition at line 33 of file kis_fixed_point_maths.h.

                              {
        return d >= 0 ? (d + (1 << 7)) >> 8 : -((-d + (1 << 7)) >> 8);
    }

References d.

Friends And Related Symbol Documentation

operator-

KisFixedPoint operator- ( KisFixedPoint x )

friend

Definition at line 124 of file kis_fixed_point_maths.h.

                                                {
    x.d = -x.d;
    return x;
}

operator<<

QDebug operator<< ( QDebug dbg, const KisFixedPoint & v )

friend

Definition at line 129 of file kis_fixed_point_maths.h.

                                                      {
    dbg.nospace() << v.toFloat() << " (d = " << v.d << ")";
    return dbg.space();
}

Member Data Documentation

d

qint32 KisFixedPoint::d

private

Definition at line 121 of file kis_fixed_point_maths.h.

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The documentation for this class was generated from the following file:

• libs/image/kis_fixed_point_maths.h