Function allegro_color_sys::allegro_color::al_color_rgb_to_hsl

pub unsafe extern "C" fn al_color_rgb_to_hsl(
    red: c_float,
    green: c_float,
    blue: c_float,
    hue: *mut c_float,
    saturation: *mut c_float,
    lightness: *mut c_float
)