code: function (col, opaque) {
              this.save();
              this.resetTransform();
              this.backBufferContext2D.globalCompositeOperation = opaque ? "copy" : "source-over";
              this.backBufferContext2D.fillStyle = (col instanceof me.Color) ? col.toRGBA() : col;
              this.fillRect(0, 0, this.backBufferCanvas.width, this.backBufferCanvas.height);
              this.restore();
          }
docs: Clears the main framebuffer with the given color
  @name clearColor
  @memberOf me.CanvasRenderer.prototype
  @function
  @param {me.Color|String} color CSS color.
  @param {Boolean} [opaque=false] Allow transparency [default] or clear the surface completely [true]