[RFC] xrandr: display gamma and brightness

[Éric Piel]

Hello,
I did this out of curiosity, but maybe it could useful for others. For
now in xrandr, even in verbose mode, the current gamma is not displayed
because it's too much info (3*256 floats typically). Therefore the user
is able to set the gamma and the brightness, but cannot know the current
value. The idea is to retrieve the values in the same simple form out of
the gamma ramps. It assumes that the gamma ramps follows just a normal
gamma correction.

Do you think it could be useful? If so, I can try to clean it up and
send it again :-)

See you,
Eric
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