ColorUnits.h

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#ifndef INCLUDE_HUEPLUSPLUS_UNITS_H
#define INCLUDE_HUEPLUSPLUS_UNITS_H

#include <cstdint>

namespace hueplusplus
{
struct HueSaturation
{
    int hue;
    int saturation;

    bool operator==(const HueSaturation& other) const { return hue == other.hue && saturation == other.saturation; }
    bool operator!=(const HueSaturation& other) const { return !(*this == other); }
};

struct XY
{
    float x;
    float y;

    bool operator==(const XY& other) const { return x == other.x && y == other.y; }
    bool operator!=(const XY& other) const { return !(*this == other); }
};

struct XYBrightness
{
    XY xy;
    float brightness;

    bool operator==(const XYBrightness& other) const { return xy == other.xy && brightness == other.brightness; }
    bool operator!=(const XYBrightness& other) const { return !(*this == other); }
};

struct ColorGamut
{
    XY redCorner;
    XY greenCorner;
    XY blueCorner;

    bool contains(const XY& xy) const;
    XY corrected(const XY& xy) const;
};

namespace gamut
{
constexpr ColorGamut gamutA {{0.704f, 0.296f}, {0.2151f, 0.7106f}, {0.138f, 0.08f}};
constexpr ColorGamut gamutB {{0.675f, 0.322f}, {0.409f, 0.518f}, {0.167f, 0.04f}};
constexpr ColorGamut gamutC {{0.692f, 0.308f}, {0.17f, 0.7f}, {0.153f, 0.048f}};
constexpr ColorGamut maxGamut {{1.f, 0.f}, {0.f, 1.f}, {0.f, 0.f}};
} // namespace gamut

struct RGB
{
    uint8_t r;
    uint8_t g;
    uint8_t b;

    bool operator==(const RGB& other) const { return r == other.r && g == other.g && b == other.b; }
    bool operator!=(const RGB& other) const { return !(*this == other); }

    XYBrightness toXY() const;
    XYBrightness toXY(const ColorGamut& gamut) const;

    HueSaturation toHueSaturation() const;

    static RGB fromXY(const XYBrightness& xy);
    static RGB fromXY(const XYBrightness& xy, const ColorGamut& gamut);
};

unsigned int kelvinToMired(unsigned int kelvin);

unsigned int miredToKelvin(unsigned int mired);
} // namespace hueplusplus

#endif