image: Uncaught (in promise) RuntimeError: unreachable

Hi, I am trying to use image and imageproc functions but keep getting in both cases a runtime error mentioning unreacheable. Any clues why this could be? I am compiling my code into wasm using cargo/wasm-pack. Thank you!

example:

let w = 200;
let h = 200;

let img = ImageBuffer::from_fn(w, h, |x, y| {
    if (x + y) % 3 == 0 {
        image::Rgba([0, 0, 0, 255])
    } else {
        image::Rgba([255, 255, 255, 255])
    }
});

img.save("out.png").unwrap();

About this issue

Original URL
State: closed
Created 3 years ago
Reactions: 2
Comments: 15 (2 by maintainers)

Most upvoted comments

@birdlavv You can copy the code here: https://crates.io/crates/console_error_panic_hook

zhyd1997 on Feb 4, 2022

Aha! It the hook produces:

panicked at 'called `Result::unwrap()` on an `Err` value: IoError(Error { kind: Unsupported, message: "operation not supported on this platform" })', src/lib.rs:20:25

After removing the img.save("out.png").unwrap(); line it ran successfully!

I believe this is because WASM does not have access to the filesystem. Thanks @zhyd1997! Bounty paid & closed.

birdlavv on Feb 4, 2022

Apologies @zhyd1997, I was unable to get a working WASM package built with those specific versions of rustup and cargo and your PR.

I’ve made a reproduction repo here: https://github.com/birdlavv/image-rs-1471-reproduction

birdlavv on Feb 3, 2022