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sucking a wee bit less

This commit is contained in:
Adam D. Ruppe 2019-03-23 14:45:15 -04:00
parent 95755a1512
commit dc8c03b7c7
1 changed files with 11 additions and 1 deletions
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12
color.d
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@ -217,6 +217,7 @@ struct Color {
/// Return black-and-white color /// Return black-and-white color
Color toBW() () nothrow pure @safe @nogc { Color toBW() () nothrow pure @safe @nogc {
// FIXME: gamma?
int intens = clampToByte(cast(int)(0.2126*r+0.7152*g+0.0722*b)); int intens = clampToByte(cast(int)(0.2126*r+0.7152*g+0.0722*b));
return Color(intens, intens, intens, a); return Color(intens, intens, intens, a);
} }
@ -520,6 +521,15 @@ Color fromHsl(double h, double s, double l, double a = 255) nothrow pure @safe @
cast(int)(a)); cast(int)(a));
} }
/// Assumes the input `u` is already between 0 and 1 fyi.
nothrow pure @safe @nogc
double srgbToLinearRgb(double u) {
if(u < 0.4045)
return u / 12.92;
else
return ((u + 0.055) / 1.055) ^^ 2.4;
}
/// Converts an RGB color into an HSL triplet. useWeightedLightness will try to get a better value for luminosity for the human eye, which is more sensitive to green than red and more to red than blue. If it is false, it just does average of the rgb. /// Converts an RGB color into an HSL triplet. useWeightedLightness will try to get a better value for luminosity for the human eye, which is more sensitive to green than red and more to red than blue. If it is false, it just does average of the rgb.
double[3] toHsl(Color c, bool useWeightedLightness = false) nothrow pure @trusted @nogc { double[3] toHsl(Color c, bool useWeightedLightness = false) nothrow pure @trusted @nogc {
double r1 = cast(double) c.r / 255; double r1 = cast(double) c.r / 255;
@ -533,7 +543,7 @@ double[3] toHsl(Color c, bool useWeightedLightness = false) nothrow pure @truste
if(useWeightedLightness) { if(useWeightedLightness) {
// the colors don't affect the eye equally // the colors don't affect the eye equally
// this is a little more accurate than plain HSL numbers // this is a little more accurate than plain HSL numbers
L = 0.2126*r1 + 0.7152*g1 + 0.0722*b1; L = 0.2126*srgbToLinearRgb(r1) + 0.7152*srgbToLinearRgb(g1) + 0.0722*srgbToLinearRgb(b1);
// maybe a better number is 299, 587, 114 // maybe a better number is 299, 587, 114
} }
double S = 0; double S = 0;