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Fixed broken interpolation of grayscale colors

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This commit is contained in:
Martin Tůma 2019-10-06 13:26:30 +02:00
parent cc0c16cfd6
commit 7ea19d260c
1 changed files with 3 additions and 1 deletions
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4
src/function.cpp
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@ -40,7 +40,9 @@ static QColor interpolate(const QPair<qreal, QColor> &p0,
qreal p1h, p1s, p1l, p1a;
p1.second.getHslF(&p1h, &p1s, &p1l, &p1a);
return QColor::fromHslF(f(p0h, p1h, ratio), f(p0s, p1s, ratio),
/* Qt returns a hue of -1 for achromatic colors. We convert it to a hue of 1
using qAbs() to enable interpolation of grayscale colors */
return QColor::fromHslF(f(qAbs(p0h), qAbs(p1h), ratio), f(p0s, p1s, ratio),
f(p0l, p1l, ratio), f(p0a, p1a, ratio));
}