Hello,
I'm trying to fix some code that creates a wrapped C++ object ("Canvas",
emulating HTMLCanvasElement) with property accessors on the prototype.
Specifically, these assertions should work to reflect browsers'
HTMLCanvasElement API:
var c = new Canvas(...);
assert(!c.hasOwnProperty("width"));
assert("width" in c);
assert(HTMLCanvasElement.prototype.hasOwnProperty("width"));
Currently there's an assertion failure (from nan) because the
InternalFieldCount for the PrototypeTemplate is 0. Setting it to 1 fixes
this problem, but without touching the rest of the code, both the
FunctionTemplate and the PrototypeTemplate now have an InternalFieldCount
of 1. Is that the correct situation? I can't find any examples of setting
accessors on prototypes to work from.
The class in question is
this: https://github.com/Automattic/node-canvas/blob/master/src/Canvas.cc#L30
(sorry it uses nan's macros and not raw v8 APIs)
and the patch setting the PrototypeTemplate's InternalFieldCount is
https://github.com/Automattic/node-canvas/issues/803#issuecomment-244275154
Thanks,
Zach
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