[Bug 10057] New: gamma handling, application access to screen gamma, disabling gamma control

[wine-bugs at winehq.org]

http://bugs.winehq.org/show_bug.cgi?id=10057

           Summary: gamma handling, application access to screen gamma,
                    disabling gamma control
           Product: Wine
           Version: CVS/GIT
          Platform: PC
        OS/Version: Linux
            Status: UNCONFIRMED
          Severity: enhancement
          Priority: P2
         Component: wine-x11driver
        AssignedTo: wine-bugs at winehq.org
        ReportedBy: tuomo.kohvakka at iki.fi


My main problem is that

a) I need somewhat calibrated display. Not properly profiled, but I like that
black is black and white is about white [2]. This can be accomplished with
proper gamma ramps, eg, using application like xgamma or nvidia-settings [1].
No problem here actually.

[1]
http://www.rancholinux.com.ar/wp-content/uploads/2007/05/nvidia-settings.png
[2] http://www.aim-dtp.net/aim/evaluation/gamma_space/index.htm

b) Whenever I use any D3D application under wine, gamma ramps get set into
"default" messing screen colors. This affects the game in question and whole
desktop after exiting application (and wine).

It would be nice if there would be a solution. However, I don't know what it
should be.

At least wine probably should restore gamma ramps when exiting, but I'm not
totally certain even about this. It would obviously forbid using any win32
gamma setting (screen calibration) software. 

It wouldn't help with messed up colors in application either. I'm wondering if
it could be possible to calculate a "calibrated" gamma ramp from user (x11) and
application (win32) supplied and use that, resulting in no change if
application just wants something flat default. This would of course have same
problem as above.

I've found that not any of the games that I play actually uses gamma setting in
any meaningful way. As such I propose following patch which allows disabling
gamma functionality by setting up a registry key.

I can supply some screen shots (camera pointing at screen showing gamma
effects) if required.

There is similar bug with gnome-screensaver, see
http://bugzilla.gnome.org/show_bug.cgi?id=342850


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