Efficient way to share data between Rust and JS, with WASM

1

In JS I'm loading in images (which will be displayed on a canvas). I need to read the width and height from these images, and send that data to Rust.

Do I just bundle the images' data in JS, to then send that; array?, object?, array of objects? to a Rust function at once?

Is this a good way?

I would want to setup something like this: https://developer.mozilla.org/en-US/docs/Web/JavaScript/Reference/Global_Objects/WebAssembly/instantiateStreaming. But I'm using wasm-pack build, and it doesn't work off the bat like the example.

2

If you are sending the content of the image, i.e. width * height * depth bytes, you probably want Uint8Array.

If all you are sending is (width, height) i.e. (u32, u32), you can probably just use json.

3

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