getImageArray doesn't handles ImageData type

[marcorighini]

getImageArrayFromDrawable correctly calls getImageArrayFromImageData if input drawable is of type ImageData.

From the documentation seems that getImageArray should correctly handle a source of type ImageData. The problem is that if you provide image of type ImageData a TypeError exception is thrown instead of calling getImageArrayFromDrawable.

[milhidaka]

Thanks for bug report. I reproduced it on Firefox 60.0.

Reproduction:
Open MNIST example and type on debug console

let idata = new ImageData(2, 2);
WebDNN.Image.getImageArray(idata);
=> TypeError: Failed to execute "getImageData(image, options)": "image" must be an instance of string, HTMLInputElement, HTMLCanvasElement, HTMLImageElement, or HTMLVideoElement object

WebDNN.Image.getImageArrayFromDrawable(idata);
=> Float32Array(12) [ 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, … ]

[milhidaka]

Fix merged to master branch. Please use latest dist/webdnn.js.