roundtrip_image/
main.rs

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//! Logs an `Image` archetype for roundtrip checks.

// Allow unwrap() in tests (allow-unwrap-in-tests doesn't apply)
#![allow(clippy::unwrap_used)]

use half::f16;
use image::{Rgb, RgbImage};
use ndarray::{Array, ShapeBuilder as _};
use rerun::{archetypes::Image, RecordingStream};

#[derive(Debug, clap::Parser)]
#[clap(author, version, about)]
struct Args {
    #[command(flatten)]
    rerun: rerun::clap::RerunArgs,
}

fn run(rec: &RecordingStream, _args: &Args) -> anyhow::Result<()> {
    let mut img = RgbImage::new(3, 2);

    // h=2 w=3 c=3 image. Red channel = x. Green channel = y. Blue channel = 128.
    for x in 0..3 {
        for y in 0..2 {
            img.put_pixel(x, y, Rgb([x as u8, y as u8, 128]));
        }
    }

    rec.log(
        "image",
        &Image::from_color_model_and_tensor(rerun::ColorModel::RGB, img)?,
    )?;

    let mut array_image = Array::<f16, _>::default((4, 5).f());

    // h=4, w=5 mono image. Pixel = x * y * 123.4
    for y in 0..4 {
        for x in 0..5 {
            *array_image.get_mut((y, x)).unwrap() = f16::from_f32(x as f32 * y as f32 * 123.4);
        }
    }

    rec.log(
        "image_f16",
        &Image::from_color_model_and_tensor(rerun::ColorModel::L, array_image)?,
    )?;

    Ok(())
}

fn main() -> anyhow::Result<()> {
    re_log::setup_logging();

    use clap::Parser as _;
    let args = Args::parse();

    let (rec, _serve_guard) = args.rerun.init("rerun_example_roundtrip_image")?;
    run(&rec, &args)
}