BC(混合后的颜色) = C x BF1 + Cs x BF2
PA模式：
BF1 = 恒定Alpha/255
BF2 = 1 - BF1
PA X CA模式：
BC(混合后的颜色） = C x BF1 +Cs x BF2
BF1 =（恒定Alpha x 像素Alpha）/255
BF2 = 1 - BF1
ltdc层透明度设置
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Origin blog.csdn.net/weixin_43527214/article/details/104670585
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