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Keeps the destination pixels that cover source pixels, discards the remaining source and destination

The source pixels are discarded, leaving the destination intact. 代码 重叠部分只保留dst的内容,清空所有的src。非重叠部分只保留d

直接Paint 绘制混合 效果图： 但是如果改成如下： 目测代码逻辑是一样的只是把混合模式设置给了Layer。但是最终效果就是界面上啥页没有全部被清空了。这是因为设置了混合模式之后,整个图层都会被当作

The source pixels are drawn over the destination pixels. 公式: 在dst.a = 1 的情况下， a = 1 ,c = src.c + (1-

srcOut Keeps the source pixels that do not cover destination pixels. Discards source pixels that cov

SRC_ATOP Discards the source pixels that do not cover destination pixels. Draws remaining source pix

SRC_IN Keeps the source pixels that cover the destination pixels, discards the remaining source and

1 SrcOut 用途： Keeps the source pixels that do not cover destination pixels. Discards source pixels th

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