[Webkit-unassigned] [Bug 123058] JSC should have an API for typed arrays

[bugzilla-daemon at webkit.org]

https://bugs.webkit.org/show_bug.cgi?id=123058





--- Comment #6 from Filip Pizlo <fpizlo at apple.com>  2013-10-19 13:44:50 PST ---
(In reply to comment #4)
> I think Alexey is also asking for a way to create typed arrays.
> 
> > JSGetTypedArrayBase(JSValueRef) -> returns void* of the first element in the view or the base of the buffer
> > JSGetTypedArrayByteLength(JSValueRef) -> returns size_t of the number of bytes that the view sees or the byteLength of the buffer.
> 
> This would be 
> 
> JSObjectGetTypedArrayBase(JSContextRef, JSValueRef)
> JSObjectGetTypedArrayByteLength(JSContextRef, JSValueRef)

OK, but out of curiosity, does it have to be?  You can get a JSGenericTypedArrayView's base and length without an ExecState*.

> 
> Maybe "BytesPtr" is a better name than "Base", to match our string and data APIs.

Yeah.

> 
> How would I know the data type in the typed array?

Why would a client care?  If they did, they can already get the element type using JS constructs.

> How long would the returned pointer remain valid?

Only so long as the JSValueRef of the buffer or view was live and so long as it wasn't neutered.

> What happens after neutering?

It's interesting to note that neutering is purely a DOM construct - it will only happen if you use the JS API in conjunction with a WebView.

Neutering will free the buffer so your pointer will become invalid.

-- 
Configure bugmail: https://bugs.webkit.org/userprefs.cgi?tab=email
------- You are receiving this mail because: -------
You are the assignee for the bug.