Converting pixel data from JavaScript to OpenCV's Mat

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I'm trying to use an OpenCV port in Google Chrome's Native Client, and things seem to be working okay, but I'm trying to hand off an image from a canvas element in JavaScript to OpenCV (in C++).

From JavaScript, I'm passing my C++ module a pixel array that's a Uint8ClampedArray (you get this in JavaScript by calling context.getImageData(args)), and I can send that as a buffer to my OpenCV module.

I'd like to convert this buffer array to an OpenCV Mat type.

Currently the image data looks like this:

pp::VarArrayBuffer array_buffer(dictionary.Get("data"));

(The dictionary is just a JSON object passed to OpenCV, where "data" contains the array buffer.)

And I've cast that to uint32_t

uint32_t* pixels = static_cast<uint32_t*>(array_buffer.Map());

But what I really need to do is figure out a way to translate that pixel array data into OpenCV's Mat type for processing. Any suggestions? (Thanks so much for any suggestions!)

**Btw, this is what NativeClient's pp::VarArrayBuffer is all about.