LABPixel.h

#ifndef LABPIXEL_H
#define LABPIXEL_H
 
#include <cmath>
 
#include "internal/Pixel.h"
 
/*
can support signed data types
preferrably float or double
*/
 
namespace ImageLib {
template <typename NumberT>
struct LABPixel : public Pixel<NumberT> {
    // ----- Members -----
    NumberT l, a, b;
 
    constexpr LABPixel(NumberT l = 0, NumberT a = 0, NumberT b = 0) : l(l), a(a), b(b) {
    }
 
    // ----- Modifiers -----
    [[nodiscard]] inline bool operator==(const LABPixel &other) const {
        return l == other.l && a == other.a && b == other.b;
    }
    [[nodiscard]] inline bool operator!=(const LABPixel &other) const {
        return !(*this == other);
    }
 
    // ----- Utilities -----
    inline void setGray(NumberT new_luma) {
        l = new_luma;
        a = b = 0;
    }
 
    static inline float colorDistance(const LABPixel<NumberT> &a, const LABPixel<NumberT> &b) {
        LABPixel<float> af{static_cast<float>(a.l), static_cast<float>(a.a),
                           static_cast<float>(a.b)};
        LABPixel<float> bf{static_cast<float>(b.l), static_cast<float>(b.a),
                           static_cast<float>(b.b)};
        return std::sqrt((a.l - b.l) * (a.l - b.l) + (a.a - b.a) * (a.a - b.a) +
                         (a.b - b.b) * (a.b - b.b));
    }
 
} __attribute__((packed));
}  // namespace ImageLib
 
#endif  // LABPIXEL_H