from_rgb
static hsl_color from_rgb(const rgb_color& rgb);
hsl_color normalViewColor = hsl_color::from_rgb(viewColor);
hsl_color newViewColor = hsl_color::from_rgb(failureColor);
const hsl_color statusColorHSL = hsl_color::from_rgb(color);
const hsl_color tabColorHSL = hsl_color::from_rgb(color);
hsl_color success = hsl_color::from_rgb(BPrivate::GetSystemColor(B_SUCCESS_COLOR, isDark));
hsl_color failure = hsl_color::from_rgb(BPrivate::GetSystemColor(B_FAILURE_COLOR, isDark));