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Fix hue for rgb colors if saturation was zero #2135

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Aug 3, 2016
Merged

Fix hue for rgb colors if saturation was zero #2135

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6 changes: 6 additions & 0 deletions src/functions.cpp
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Original file line number Diff line number Diff line change
Expand Up @@ -385,6 +385,12 @@ namespace Sass {
while (h < 0) h += 1;
while (h > 1) h -= 1;

// if saturation is exacly zero, we loose
// information for hue, since it will evaluate
// to zero if converted back from rgb. Setting
// saturation to a very tiny number solves this.
if (s == 0) s = 1e-10;

// Algorithm from the CSS3 spec: http://www.w3.org/TR/css3-color/#hsl-color.
double m2;
if (l <= 0.5) m2 = l*(s+1.0);
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