KisLanczos3FilterStrategy Class Reference

#include <kis_filter_strategy.h>

Inheritance diagram for KisLanczos3FilterStrategy:

Public Member Functions
QString	description () override
	KisLanczos3FilterStrategy ()
qreal	valueAt (qreal t, qreal weightsPositionScale) const override
	~KisLanczos3FilterStrategy () override
Public Member Functions inherited from KisFilterStrategy
QString	id ()
virtual qint32	intSupport (qreal weightsPositionScale)
virtual qint32	intValueAt (qint32 t, qreal weightsPositionScale) const
	KisFilterStrategy (KoID id)
QString	name ()
virtual qreal	support (qreal weightsPositionScale)
virtual	~KisFilterStrategy ()

Private Member Functions
qreal	sinc (qreal x) const

Additional Inherited Members
Protected Attributes inherited from KisFilterStrategy
qint32	intSupportVal {0}
KoID	m_id
qreal	supportVal {0.0}

Detailed Description

Definition at line 143 of file kis_filter_strategy.h.

Constructor & Destructor Documentation

KisLanczos3FilterStrategy()

KisLanczos3FilterStrategy::KisLanczos3FilterStrategy ( )

inline

Definition at line 146 of file kis_filter_strategy.h.

                                : KisFilterStrategy(KoID("Lanczos3", i18n("Lanczos3"))) {
        supportVal = 3.0; intSupportVal = 768;
    }

~KisLanczos3FilterStrategy()

KisLanczos3FilterStrategy::~KisLanczos3FilterStrategy ( )

inlineoverride

Definition at line 149 of file kis_filter_strategy.h.

{}

Member Function Documentation

description()

QString KisLanczos3FilterStrategy::description ( )

inlineoverridevirtual

Reimplemented from KisFilterStrategy.

Definition at line 151 of file kis_filter_strategy.h.

                                   {
        return i18n("Offers similar results than Bicubic, but maybe a little bit sharper. Can produce light and dark halos along strong edges.");
    }

sinc()

qreal KisLanczos3FilterStrategy::sinc ( qreal x ) const

private

Definition at line 164 of file kis_filter_strategy.cc.

{
    const qreal pi = 3.1415926535897932385;
    x *= pi;
    if (x != 0) return(sin(x) / x);
    return(1.0);
}

valueAt()

qreal KisLanczos3FilterStrategy::valueAt ( qreal t, qreal weightsPositionScale ) const

overridevirtual

Reimplemented from KisFilterStrategy.

Definition at line 156 of file kis_filter_strategy.cc.

{
    Q_UNUSED(weightsPositionScale);
    if (t < 0) t = -t;
    if (t < 3.0) return(sinc(t) * sinc(t / 3.0));
    return(0.0);
}

References sinc().

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

• libs/image/kis_filter_strategy.h
• libs/image/kis_filter_strategy.cc