I'm trying to set a circle of pixels to transparent in a Bitmap.
Currently I am iterating through the pixels in a circle and drawing
them with Bitmap.setPixel(x, y, Color.TRANSPARENT), and I would like
to see if it is quicker to make a Canvas from the Bitmap and use
Canvas.drawCircle(x, y, Color.TRANSPARENT);. However, when drawing to
the Canvas with a transparent Paint, it doesn't replace the colour but
draws on top of it, so I see no change in the Bitmap.

Is there a way to make Canvas.drawXXX replace the colours below rather
than paint on top of them?

Cheers,
Martin

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