KisBilinearFilterStrategy Class Reference

#include <kis_filter_strategy.h>

Inheritance diagram for KisBilinearFilterStrategy:

Public Member Functions
QString	description () override
qint32	intValueAt (qint32 t, qreal weightsPositionScale) const override
	KisBilinearFilterStrategy ()
qreal	valueAt (qreal t, qreal weightsPositionScale) const override
	~KisBilinearFilterStrategy () override
Public Member Functions inherited from KisFilterStrategy
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 105 of file kis_filter_strategy.h.

Constructor & Destructor Documentation

KisBilinearFilterStrategy()

KisBilinearFilterStrategy::KisBilinearFilterStrategy ( )

inline

Definition at line 108 of file kis_filter_strategy.h.

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

~KisBilinearFilterStrategy()

KisBilinearFilterStrategy::~KisBilinearFilterStrategy ( )

inlineoverride

Definition at line 111 of file kis_filter_strategy.h.

{}

Member Function Documentation

description()

QString KisBilinearFilterStrategy::description ( )

inlineoverridevirtual

Reimplemented from KisFilterStrategy.

Definition at line 113 of file kis_filter_strategy.h.

                                   {
        return i18n("Adds pixels averaging the color values of surrounding pixels. Produces medium quality results when the image is scaled from half to two times the original size.");
    }

intValueAt()

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

overridevirtual

Reimplemented from KisFilterStrategy.

Definition at line 114 of file kis_filter_strategy.cc.

{
    Q_UNUSED(weightsPositionScale);
    /* f(t) = |t|, -1 <= t <= 1 */
    if (t < 0) t = -t;
    if (t < 256) {
        // calc 256-1 but also go from .8 fixed point to 8bitscale. ie t = (t*255)/256; ie: if(t>=128) return t-1;
        if (t >= 128) return 256 - t;
        return 255 - t;
    }
    return(0);
}

valueAt()

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

overridevirtual

Reimplemented from KisFilterStrategy.

Definition at line 106 of file kis_filter_strategy.cc.

{
    Q_UNUSED(weightsPositionScale);
    if (t < 0.0) t = -t;
    if (t < 1.0) return(1.0 - t);
    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