#include <KisGradientMapFilterDitherCachedGradient.h>

Classes
struct	CachedEntry

Public Member Functions
const CachedEntry &	cachedAt (qreal t) const
	gets the color data at position 0 <= t <= 1

	KisGradientMapFilterDitherCachedGradient (const KoAbstractGradientSP gradient, qint32 steps, const KoColorSpace *cs)

Private Attributes
QVector< CachedEntry >	m_cachedEntries

const qint32	m_max

const CachedEntry	m_nullEntry

Detailed Description

Definition at line 19 of file KisGradientMapFilterDitherCachedGradient.h.

Constructor & Destructor Documentation

◆ KisGradientMapFilterDitherCachedGradient()

KisGradientMapFilterDitherCachedGradient::KisGradientMapFilterDitherCachedGradient	(	const KoAbstractGradientSP	gradient,
		qint32	steps,
		const KoColorSpace *	cs )

Definition at line 17 of file KisGradientMapFilterDitherCachedGradient.cpp.

    : m_max(steps - 1)
    , m_nullEntry(CachedEntry{KoColor(cs), KoColor(cs), 0.0})
{
    if (gradient.dynamicCast<KoStopGradient>()) {
        KoStopGradient *stopGradient = static_cast<KoStopGradient*>(gradient.data());
        for (qint32 i = 0; i < steps; i++) {
            qreal t = static_cast<qreal>(i) / m_max;
            KoGradientStop leftStop, rightStop;
            if (!stopGradient->stopsAt(leftStop, rightStop, t)) {
                m_cachedEntries << m_nullEntry;
            } else {
                const qreal localT = (t - leftStop.position) / (rightStop.position - leftStop.position);
                m_cachedEntries << CachedEntry{leftStop.color.convertedTo(cs), rightStop.color.convertedTo(cs), localT};
            }
        }
    } else if (gradient.dynamicCast<KoSegmentGradient>()) {
        KoSegmentGradient *segmentGradient = static_cast<KoSegmentGradient*>(gradient.data());
        for (qint32 i = 0; i < steps; i++) {
            qreal t = static_cast<qreal>(i) / m_max;
            KoGradientSegment *segment = segmentGradient->segmentAt(t);
            if (!segment) {
                m_cachedEntries << m_nullEntry;
            } else {
                const qreal localT = (t - segment->startOffset()) / (segment->endOffset() - segment->startOffset());
                m_cachedEntries << CachedEntry{segment->startColor().convertedTo(cs), segment->endColor().convertedTo(cs), localT};
            }
        }
    }
}

References KoGradientStop::color, KoColor::convertedTo(), KoGradientSegment::endColor(), KoGradientSegment::endOffset(), m_cachedEntries, m_max, m_nullEntry, KoGradientStop::position, KoSegmentGradient::segmentAt(), KoGradientSegment::startColor(), KoGradientSegment::startOffset(), and KoStopGradient::stopsAt().

Member Function Documentation

◆ cachedAt()

const KisGradientMapFilterDitherCachedGradient::CachedEntry & KisGradientMapFilterDitherCachedGradient::cachedAt ( qreal t ) const

gets the color data at position 0 <= t <= 1

Definition at line 48 of file KisGradientMapFilterDitherCachedGradient.cpp.

{
    qint32 tInt = t * m_max + 0.5;
    if (m_cachedEntries.size() > tInt) {
        return m_cachedEntries[tInt];
    } else {
        return m_nullEntry;
    }
}