I am looking for some source code which manipulates pixels within a bitmap
or window, preferably greyscale images manipulating either or both planes.
My ultimate goal is to quantize a greyscale image down to black and white,
scrANDNOT it off the screen, then scrOR the original greyscale image back
onto the screen.
The way it stands now, if you scrOR a light grey pixel onto a dark grey
pixel, the pixel becomes black on the screen. Icky! I want the pixels
copied onto the screen to take precedence as to what is already there.
