Canvas.toDataURL is not base64 encoded

calling toDataURL and logging the result gives the below:

data:image/png;base64,�PNG

    �Om
�╝\ ╔+.��    IEND�B`�

there is a base64 function here - https://github.com/ReneNyffenegger/cpp-base64 would that be suitable do you think? I can cut a PR if you think that one could work.

[sidequestlegend]

I had exactly the same thought, i had a branch but had some problems sending the buffer back. I see you have it in hand though 😃

[avaer]

Actually I see this is done by Skia: https://github.com/webmixedreality/exokit/blob/master/deps/exokit-bindings/canvascontext/src/canvas-context.cc#L1259

So we could probably get this as an ArrayBuffer (therefore implementing toBlob), and use Buffer to convert that to a base64 string.