javascript/gwt: converting Uint8Array or ArrayBuffer to ImageData element

gwt, html, javascript

Solution

It would go something like this in pure javascript:

var c=document.getElementById("myCanvas");
var ctx=c.getContext("2d");    
var imgData = ctx.createImageData(100,100);

var buffer = new ArrayBuffer(4*100*100);
var ubuf = new Uint8Array(buffer);
for (var i=0;i < ubuf.length; i+=4) {
    imgData.data[i]   = ubuf[i];   //red
    imgData.data[i+1] = ubuf[i+1]; //green
    imgData.data[i+2] = ubuf[i+2]; //blue
    imgData.data[i+3] = ubuf[i+3]; //alpha
}

ctx.putImageData(imgData,0,0);

To do this in GWT you need to wrap this in a JSNI method

Problem

I want to take an ArrayBuffer or Uint8Array element and convert them to ImageData element, and eventually to Canvas element. Is it possible?

Original source