How-to alter a pixmap?

[Antonio Villani]

Hi,

i would patch xorg in such way that i can modify the pixmap for security
reasons (Soft tempest).
The first, idiot, goal is to send to the monitor a function of the "normal"
pixmap (more precisely the
negative of the color).

I would try just to flip each bit into the framebuffer automatically but i
can't find where the server sends data
to the video card on each refresh.

I'm still understanding how all the things works in xorg so any suggestions
would be much appreciated.

Thank you
Antonio
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