function rollbackDefaultTextStyle(style) {
    var insideRollback = style.insideRollback;
    if (insideRollback) {
        // Reset all of the props in `CACHED_LABEL_STYLE_PROPERTIES`.
        style.textFill = insideRollback.textFill;
        style.textStroke = insideRollback.textStroke;
        style.textStrokeWidth = insideRollback.textStrokeWidth;
        style.insideRollback = null;
    }
}
Apply transform to an vertex.
@param {Array.<number>} target [x, y]
@param {Array.<number>|TypedArray.<number>|Object} transform Can be:
     + Transform matrix: like [1, 0, 0, 1, 0, 0]
     + {position, rotation, scale}, the same as `zrender/Transformable`.
@param {boolean=} invert Whether use invert matrix.
@return {Array.<number>} [x, y]