Minimum SIXEL in Rust

sixel.rs

use anyhow::{anyhow, Result};
use std::io::Write;

// MIT: Atanas Yankov <atanas.yankov98@gmail.com>
// https://github.com/atanunq/viuer/blob/3b99255f0d1586dd5b8cb1d409fa8515d9e77493/Cargo.toml#L10
// https://github.com/atanunq/viuer/blob/3b99255f0d1586dd5b8cb1d409fa8515d9e77493/src/printer/sixel.rs#L23
pub fn render_image(image: &image::DynamicImage) -> Result<()> {
    let image = image.resize(128, 128, image::imageops::Nearest);
    let encoder = sixel::encoder::Encoder::new()
        .map_err(|e| anyhow!("failed to create a sixel encoder: {:?}", e))?;
    let rgb = image.to_rgb8();
    let frame = sixel::encoder::QuickFrameBuilder::new()
        .width(rgb.width() as usize)
        .height(rgb.height() as usize)
        .format(sixel_sys::PixelFormat::RGB888)
        .pixels(rgb.to_vec());
    encoder
        .encode_bytes(frame)
        .map_err(|e| anyhow!("failed to encode bytes: {:?}", e))?;
    Ok(())
}

// MIT: Atanas Yankov <atanas.yankov98@gmail.com>
// https://github.com/atanunq/viuer/blob/3b99255f0d1586dd5b8cb1d409fa8515d9e77493/Cargo.toml#L10
// https://github.com/atanunq/viuer/blob/3b99255f0d1586dd5b8cb1d409fa8515d9e77493/src/printer/sixel.rs#L82
pub fn is_sixel_supported() -> bool {
    if let Ok(term) = std::env::var("TERM") {
        match term.as_str() {
            "mlterm" | "yaft-256color" | "foot" => return true,
            "st-256color" | "xterm" | "xterm-256color" => {
                return check_device_attrs().unwrap_or(false)
            }
            _ => {
                if let Ok(term_program) = std::env::var("TERM_PROGRAM") {
                    return term_program == "MacTerm";
                }
            }
        }
    }
    false
}

// MIT: Atanas Yankov <atanas.yankov98@gmail.com>
// https://github.com/atanunq/viuer/blob/3b99255f0d1586dd5b8cb1d409fa8515d9e77493/Cargo.toml#L10
// https://github.com/atanunq/viuer/blob/3b99255f0d1586dd5b8cb1d409fa8515d9e77493/src/printer/sixel.rs#L61
fn check_device_attrs() -> Result<bool> {
    let mut term = console::Term::stdout();
    let mut resp = String::new();

    write!(&mut term, "\x1b[c")?;
    term.flush()?;
    while let Ok(c) = term.read_char() {
        if c == 'c' {
            break;
        }
        resp.push(c);
    }
    term.clear_line()?;

    let mut bits = resp.split(";");
    Ok(bits.any(|v| v == "4"))
}

• sixel-rs
• sixel-sys
• console