在网站上看到过很多Alpha混合计算的相关文档，其中不乏经典之作，但大多数都是基于16位显示模式下的，而256色的却很少有人谈及。所以，决定写一个基于256色的Alpha混合算法的详细实现方法。以帮助那些初学者，给他们一点点小小的灵感：）-Alpha blending calculations related documents see on the site, many of them classics, but most are based on 16-bit display mode, 256 colors but rarely talked about. So, I decided to write a method based on the 256 Color Alpha Blending algorithm. To help those who are beginners, giving them a little bit of inspiration :)