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RGB to HSV conversion

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This commit is contained in:
Ian Gulliver
2017-08-13 12:10:58 -07:00
parent 018beba472
commit 7a47fc4a56
3 changed files with 51 additions and 4 deletions
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36
color.cc
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@@ -2,3 +2,39 @@
RgbColor::RgbColor(const Color<3>& src)
: Color<3>(src) {}
RgbColor::operator HsvColor() const {
constexpr int32_t kSection = kNumColors / 6;
int32_t max = *std::max_element(this->begin(), this->end());
int32_t min = *std::min_element(this->begin(), this->end());
int32_t delta = max - min;
if (delta == 0) {
return {{{{{0x0000, 0x0000, max}}}}};
}
HsvColor ret = {{{{{0, 0, max}}}}};
if (max == this->at(0)) {
ret.at(0) = (kSection * (this->at(1) - this->at(2))) / delta + (0 * kSection);
} else if (max == this->at(1)) {
ret.at(0) = (kSection * (this->at(2) - this->at(0))) / delta + (2 * kSection);
} else {
assert(max == this->at(2));
ret.at(0) = (kSection * (this->at(0) - this->at(1))) / delta + (4 * kSection);
}
if (ret.at(0) < 0) {
ret.at(0) += kNumColors;
}
if (max > 0) {
ret.at(1) = static_cast<int32_t>(static_cast<int64_t>(delta) * kMaxColor / max);
}
return ret;
}
HsvColor::HsvColor(const Color<3>& src)
: Color<3>(src) {}