KisHermiteFilterStrategy Class Reference

#include <kis_filter_strategy.h>

Inheritance diagram for KisHermiteFilterStrategy:

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

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

Detailed Description

Definition at line 57 of file kis_filter_strategy.h.

Constructor & Destructor Documentation

KisHermiteFilterStrategy()

KisHermiteFilterStrategy::KisHermiteFilterStrategy ( )

inline

Definition at line 60 of file kis_filter_strategy.h.

                               : KisFilterStrategy(KoID("Hermite", i18n("Hermite"))) {
        supportVal = 1.0; intSupportVal = 256;
    }

~KisHermiteFilterStrategy()

KisHermiteFilterStrategy::~KisHermiteFilterStrategy ( )

inlineoverride

Definition at line 63 of file kis_filter_strategy.h.

{}

Member Function Documentation

intValueAt()

qint32 KisHermiteFilterStrategy::intValueAt ( qint32 t, qreal weightsPositionScale ) const

overridevirtual

Reimplemented from KisFilterStrategy.

Definition at line 31 of file kis_filter_strategy.cc.

{
    Q_UNUSED(weightsPositionScale);
    /* f(t) = 2|t|^3 - 3|t|^2 + 1, -1 <= t <= 1 */
    if (t < 0) t = -t;
    if (t < 256) {
        t = (2 * t - 3 * 256) * t * t + (256 << 16);
 
        //go from .24 fixed point to .8 fixedpoint (hack only works with positive numbers, which it is)
        t = (t + 0x8000) >> 16;
 
        // go from .8 fixed point to 8bitscale. ie t = (t*255)/256;
        if (t >= 128)
            return t - 1;
        return t;
    }
    return(0);
}

valueAt()

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

overridevirtual

Reimplemented from KisFilterStrategy.

Definition at line 22 of file kis_filter_strategy.cc.

{
    Q_UNUSED(weightsPositionScale);
    /* f(t) = 2|t|^3 - 3|t|^2 + 1, -1 <= t <= 1 */
    if (t < 0.0) t = -t;
    if (t < 1.0) return((2.0 * t - 3.0) * t * t + 1.0);
    return(0.0);
}

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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