colorsys 0.7.3

A module for color conversion and mutation. Works with RGB(a)( as hexadecimal too), HSL(a), CMYK color models and with ANSI color codes
Documentation 
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#[cfg(not(feature = "std"))]
use alloc::string::String;

use crate::consts::RGB_UNIT_MAX;
use crate::{ColorTuple, ColorTupleA};
use crate::common::f64_round;

fn to_hex(n: f64) -> String {
  let s = format!("{:x}", f64_round(n) as u32);
  if s.len() == 1 {
    String::from("0") + &s
  } else {
    s
  }
}

pub fn rgb_to_hex(t: &ColorTuple) -> String {
  let (r, g, b) = *t;

  format!("#{}{}{}", to_hex(r), to_hex(g), to_hex(b))
}

pub fn rgb_to_hexa(t: &ColorTupleA) -> String {
  let (r, g, b, a) = *t;

  format!("#{}{}{}{}", to_hex(r), to_hex(g), to_hex(b), to_hex(a * RGB_UNIT_MAX))
}