zeus/src/CColor.cpp

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#include "zeus/CColor.hpp"
#include <algorithm>
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namespace zeus {
float hueToRgb(float p, float q, float t) {
if (t < 0.0f)
t += 1.0f;
if (t > 1.0f)
t -= 1.0f;
if (t < 1.f / 6.f)
return p + (q - p) * 6.f * t;
if (t < 1.f / 2.f)
return q;
if (t < 2.f / 3.f)
return p + (q - p) * (2.f / 3.f - t) * 6.f;
return p;
}
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void CColor::fromHSV(float h, float s, float v, float _a) {
int i = int(h * 6.f);
float f = h * 6.f - i;
float p = v * (1.f - s);
float q = v * (1.f - f * s);
float t = v * (1.f - (1.f - f) * s);
simd_floats fo;
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switch (i % 6) {
case 0:
fo[0] = v, fo[1] = t, fo[2] = p;
break;
case 1:
fo[0] = q, fo[1] = v, fo[2] = p;
break;
case 2:
fo[0] = p, fo[1] = v, fo[2] = t;
break;
case 3:
fo[0] = p, fo[1] = q, fo[2] = v;
break;
case 4:
fo[0] = t, fo[1] = p, fo[2] = v;
break;
case 5:
fo[0] = v, fo[1] = p, fo[2] = q;
break;
default:
break;
}
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fo[3] = _a;
mSimd.copy_from(fo);
}
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void CColor::toHSV(float& h, float& s, float& v) const {
const float min = std::min({r(), g(), b()});
const float max = std::max({r(), g(), b()});
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v = max;
const float delta = max - min;
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s = max == 0.f ? 0.f : delta / max;
if (max == min) {
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h = 0.f;
} else {
if (max == r()) {
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h = (g() - b()) / delta + (g() < b() ? 6.f : 0.f);
} else if (max == g()) {
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h = (b() - r()) / delta + 2.f;
} else if (max == b()) {
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h = (r() - g()) / delta + 4.f;
}
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h /= 6.f;
}
}
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void CColor::fromHSL(float h, float s, float l, float _a) {
if (s == 0.0f) {
mSimd = simd<float>(l);
} else {
const float q = l < 0.5f ? l * (1.f + s) : l + s - 1.f * s;
const float p = 2.f * l - q;
r() = hueToRgb(p, q, h + 1.f / 3.f);
g() = hueToRgb(p, q, h);
b() = hueToRgb(p, q, h - 1.f / 3.f);
}
a() = _a;
}
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void CColor::toHSL(float& h, float& s, float& l) const {
const float min = std::min({r(), g(), b()});
const float max = std::max({r(), g(), b()});
l = (max + min) / 2.0f;
if (max == min) {
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h = s = 0.f;
} else {
const float d = max - min;
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s = l > 0.5f ? d / (2.f - max - min) : d / (max + min);
if (max == r()) {
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h = (g() - b()) / d + (g() < b() ? 6.f : 0.f);
} else if (max == g()) {
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h = (b() - r()) / d + 2.f;
} else if (max == b()) {
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h = (r() - g()) / d + 4.f;
}
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h /= 6.f;
}
}
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} // namespace zeus