docs: function (x, y, r, g, b, a) {
  		x = Math.ceil(x);
  		y = Math.ceil(y);
  		var offset = (x + y * this.width) * 4;
  			
  		this.data[offset + 0] = Math.floor(r);
  		this.data[offset + 1] = Math.floor(g);
  		this.data[offset + 2] = Math.floor(b);
  		this.data[offset + 3] = (arguments.length == 5) ? Math.floor(a) : 255;
  	}