WASM support

[dshatz]

Would be nice to also build for wasm.

There is an (experimental) wasm pdfium binary: https://github.com/bblanchon/pdfium-binaries

[Maxi937]

I would like support for wasm for an app I am building. I am wondering if you could give a high level overview of what must be done and maybe I could take a crack at it. I had a go already and I don't think I am going in the right direction.

[dshatz]

I would like support for wasm for an app I am building. I am wondering if you could give a high level overview of what must be done and maybe I could take a crack at it. I had a go already and I don't think I am going in the right direction.

Hi and thanks for your interest! @Maxi937

Wasm implementation should be similar to iOS in a sense that it's native only, without all the JNI stuff. So after adding the wasm target you should be able to directly use PdfRenderer in the native source set.

You will also need to add a native wasm lib and somehow make Gradle bundle that into the library. This part I'm not familiar with, will need to try different things.

In regards to buffers, I would start with the code for creating the compose image to figure out what is the most efficient type for the buffer. Hopefully it's the same as on ios. From there you can just reuse the existing code for buffer allocation or make another actual function.

Will be happy to help. You can also share what you have accomplished so maybe I'll have some more thoughts.