code: function (mat2d) {
              var a = mat2d.val;
              var tx = a[6],
                  ty = a[7];
  
              if (this.settings.subPixel === false) {
                  tx = ~~tx;
                  ty = ~~ty;
              }
  
              this.backBufferContext2D.transform(
                  a[0],
                  a[1],
                  a[3],
                  a[4],
                  tx,
                  ty
              );
          }
docs: Multiply given matrix into the renderer tranformation matrix
  @name transform
  @memberOf me.CanvasRenderer.prototype
  @function
  @param {me.Matrix2d} mat2d Matrix to transform by