I have a canvas in Android where I draw many circles with 1 to 10px diameter. I only want to print this circle on transparent background, if there is any other color anywhere at the place where the circle would be painted, it should be canceled and I want to know the color which is on that place already. Also when its just overlapping a little bit.The problem is, alle the methods I have found have a bad performance. I'm painting more than 10000 circles on the screen, that works fine, but they are overlapping and I have to handle that problem.Can anyone help me?? 