Rust Image URL to ASCII

img_url_to_ascii.rs

use image::{io::Reader as ImageReader, GenericImageView};
use reqwest::blocking::get;
use std::io::{Cursor, Write};

fn main() {
    // Fetch the image from the URL
    let url = "https://media-4.api-sports.io/football/teams/529.png";
    let response = get(url).expect("Failed to fetch the image");
    let bytes = response.bytes().expect("Failed to read response bytes");

    // Create a cursor from the response bytes
    let cursor = Cursor::new(bytes);

    // Convert the cursor to a dynamic image
    let img = ImageReader::with_format(cursor, image::ImageFormat::Png)
        .decode()
        .expect("Failed to decode image");

    // Convert the image to an ascii
    let glyph = convert_image_to_ascii(&img);

    // Simulating appending ascii to the output using write!()
    let mut output = Vec::new();

    write!(&mut output, "{}", glyph).expect("Failed to write to output");

    // Print the output (or use it as needed)
    println!("{}", String::from_utf8_lossy(&output));
}

fn convert_image_to_ascii(img: &image::DynamicImage) -> String {
    // Resize the image to a specific width and height
    let resized_img = img.resize_exact(90, 50, image::imageops::FilterType::Lanczos3);

    // Convert the resized image to grayscale
    let grayscale_img = resized_img.grayscale();

    // Define the ASCII characters to represent varying intensities
    let ascii_chars = ['0', '#', '8', '&', 'o', ':', '*', '.', ' '];

    let mut result = String::new();

    // Iterate through each pixel and convert its intensity to ASCII
    for y in 0..grayscale_img.height() {
        for x in 0..grayscale_img.width() {
            let pixel = grayscale_img.get_pixel(x, y);
            let luminance = pixel[0] as usize; // Assuming grayscale has only one channel

            // Normalize luminance to ASCII characters
            let index = (luminance * (ascii_chars.len() - 1)) / 255;
            let ascii_char = ascii_chars[index];

            result.push(ascii_char);
        }
        result.push('\n'); // Newline for each row
    }

    result
}