D21948: [colorcorrection] Add "Constant" mode

[Roman Gilg]

romangg added a comment.


  The idea for constant changes to screen temperature was to have this in a separate facility for generic color correction. This would then allow to:
  
  - Change overall color temperature, brightness and contrast
  - Or change gamma curves directly.
  
  Like KGamma. The constant change would be the baseline and could then be multiplied by Night Color values. A separate mode to Night Color does not allow that. And it is in my opinion also structurally not the place for it.
  
  If you want to do constant color adjustment create a new class for it independent of NightColor and create a method to combine these input variables into unique ramps sent to crtcs.

REPOSITORY
  R108 KWin

REVISION DETAIL
  https://phabricator.kde.org/D21948

To: zzag, #kwin
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