code: function (inData, outData, width, height, options) {
          options = defaultOptions(options, {radius: 10});
          for (var i = 0; i < inData.length; i += 1) {
              outData[i] = inData[i];
          }
          stackblur(outData, width, height, options.radius);
      }
docs: Uses fast stackblur algorithm from http://www.quasimondo.com/StackBlurForCanvas