如何借鉴使用其他位图作为掩码位图？ [英] How to draw on bitmap using another bitmap as mask?

问题描述

我要的画的使用另一个位图作为掩码的位图。掩码是黑色的位图，在它透明物体。我希望此透明部分也可以填充有任意颜色，并添加到我的原始图像。如何才能做到这一点？

I want to draw on a bitmap using another bitmap as mask. The mask is a black bitmap with a transparent object in it. I want this transparent part to be filled with an arbitrary color and added to my original image. How can this be done?

推荐答案

我不得不通过@Christian描述来改变口罩。然后，想要的结果可以很容易地制备：

I had to change the masks as described by @Christian. Then, the wanted result could easily be produced:

canvas.drawRect(rect, paint);
paint.setXfermode(new PorterDuffXfermode(Mode.DST_IN));
canvas.drawBitmap(mask, 0.0f, 0.0f, paint);

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