code: function () {
              this.backBufferContext2D.restore();
              this.currentColor.glArray[3] = this.backBufferContext2D.globalAlpha;
              this.currentScissor[0] = 0;
              this.currentScissor[1] = 0;
              this.currentScissor[2] = this.backBufferCanvas.width;
              this.currentScissor[3] = this.backBufferCanvas.height;
          }
docs: restores the canvas context
  @name restore
  @memberOf me.CanvasRenderer.prototype
  @function