说明：  主要是实现Yxy转RGB，在搞ZIGBEE项目的时候，花了好几天研究这个玩意，最后终于被搞出来了，注意，里面是适合D65 模式，其它的要改那3个方程的系数，系数要补偿到1.希望能帮助到你。你也可以在里面加入伽玛算法。看个人需求，这个里面我就没加入了。
(It is mainly to realize the conversion of YXY to RGB. During the ZigBee project, I spent several days studying this device. Finally, it was developed. Note that it is suitable for D65 mode. The coefficients of the three equations should be changed to 1)