ascii-image-cli 0.2.0

Convert images into ASCII art using a fast Rust CLI
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use image::{Rgb, RgbImage};
use rusttype::{Font, Scale};

use crate::config::*;

pub fn draw_char(
    font: &Font,
    ch: char,
    color: [u8; 3],
    out: &mut RgbImage,
    base_x: u32,
    base_y: u32,
    config: &Config,
    greyscale: bool,
) {
    let scale = Scale {
        x: config.char_w as f32,
        y: config.char_h as f32,
    };

    let glyph = font.glyph(ch).scaled(scale).positioned(rusttype::point(
        base_x as f32,
        (base_y + config.char_h as u32) as f32,
    ));

    if let Some(bb) = glyph.pixel_bounding_box() {
        glyph.draw(|px, py, v| {
            let x = bb.min.x + px as i32;
            let y = bb.min.y + py as i32;

            if x >= 0 && y >= 0 {
                let x = x as u32;
                let y = y as u32;

                if x < out.width() && y < out.height() {
                    let pixel = if !greyscale {
                        Rgb([
                            (color[0] as f32 * v) as u8,
                            (color[1] as f32 * v) as u8,
                            (color[2] as f32 * v) as u8,
                        ])
                    } else {
                        Rgb([255, 255, 255])
                    };

                    out.put_pixel(x, y, pixel);
                }
            }
        });
    }
}