Can anyone here explain, or point me at an example, of how to move large data, e.g an image, between JS memory and wasm memory using a function defined with WebIDL binder?
In embind for moving data from JS to wasm, I use an emscripten::val parameter
to pass in the JS handle then emscripten::val::module_property to get a handle
to the wasm memory on which I make a memory view to which the data is copied.
To move data from wasm to JS I use emscripten::val::get_typed_memory_view to
create a view onto the item in wasm memory and return the view via a
emscripten::val.
I tried to use emscripten::val with WebIDL binder but I could not get it to
compile. There is a short section in the WebIDL docs "Pointers, References,
Value types (Ref and Value)”, which is not very illuminating, but does suggest
that emscripten::val is not the right way to move data with WebIDL binder.
I’d prefer to use WebIDL binder because in order to document my previous embind
wrappers I ended up writing what looked very much like web IDL because it seems
the best way to tie all the pieces together.
Regards
-Mark
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