Renderer/src/color.rs

use super::{utility, Color, Rgb, RgbImage};
use std::io::Write;

pub fn write_color(out: &mut impl Write, pixel_color: &Color) {
    write!(
        out,
        "{} {} {}\n",
        (255.999 * pixel_color.x()) as u32,
        (255.999 * pixel_color.y()) as u32,
        (255.999 * pixel_color.z()) as u32
    )
    .unwrap();
}

pub fn put_color(img: &mut RgbImage, pixel_color: &Color, x: u32, y: u32, samples_per_pixel: u32) {
    let mut r = pixel_color.x();
    let mut g = pixel_color.y();
    let mut b = pixel_color.z();

    let scale = 1.0 / samples_per_pixel as f64;
    r *= scale;
    g *= scale;
    b *= scale;

    img.put_pixel(
        x,
        y,
        Rgb([
            (256.0 * utility::clamp(r, 0.0, 0.999)) as u8,
            (256.0 * utility::clamp(g, 0.0, 0.999)) as u8,
            (256.0 * utility::clamp(b, 0.0, 0.999)) as u8,
        ]),
    );
}