I have a bitmap and want to be able to change all black pixels to all
blue. I know you can do this via Bitmap.setPixel but that process is
extremely slow (believe me, I tried it).

Researching this is see where people recommend using PorterDuff Xor,
but there isn't any posts on how this was successfully done. Lots of
people asking...no one spelling out the answer.

So using, paint, bitmap, and canvas, how do you change every black
pixel to all blue ones?

Thanks!

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