draw image using DataURI

gistfile1.txt

  socket.on("render_data", function(data) {
    console.log("render_data");

    var canvas = document.getElementById('mycanvas');
    var ctx = canvas.getContext('2d');
    var canvasWidth  = canvas.width;
    var canvasHeight = canvas.height;

    var img = new Image();
    img.onload = function() { ctx.drawImage(img, 0, 0, canvasWidth, canvasHeight); };
    img.src = data; // Assume data is provided as DataURI format
  });