D20263: [WIP] Keep perceived contrast in random background color

[Mariusz Glebocki]

mglb created this revision.
mglb added projects: Konsole, VDG.
mglb requested review of this revision.

REVISION SUMMARY
  Randomize colors using HSLuv color space instead of HSL. It has
  perceptually uniform lightness, which means every color with the same
  lightness value is perceived as equally bright by humans. Displays
  quality and lack of calibration in most monitors lowers this uniformity,
  but even on worst color display it should be better than standard HSL.
  
  More information about HSLuv: http://www.hsluv.org/
  
  Minor changes:
  
  - Random seed takes PID into account to prevent repeated colors in separate Konsole processes
  - Key names in a config were changed
  - Adapted "Black on random light" color scheme
  
  Breeze with random ranges on default bg and fg: hue=360° saturation=100:
  F6754773: Screenshot_2019-04-05-14-17-38.png <https://phabricator.kde.org/F6754773>
  
  Todo:
  
  - Automatically convert old values to new values when color scheme is loaded
  - Adjust defaults
  - Put https://github.com/hsluv/hsluv-c files (without tests) in `src/3rdparty/hsluv-c`. For now, hsluv.[c,h] are in src.
  - (?) Change "randomize background color" checkbox function to "randomize background and foreground color" (maybe in separate review)

REPOSITORY
  R319 Konsole

BRANCH
  wip/Keep-perceived-contrast-in-random-background-color (branched from master)

REVISION DETAIL
  https://phabricator.kde.org/D20263

AFFECTED FILES
  data/color-schemes/BlackOnRandomLight.colorscheme
  src/CMakeLists.txt
  src/ColorScheme.cpp
  src/ColorScheme.h
  src/ViewManager.cpp
  src/hsluv.c
  src/hsluv.h

To: mglb
Cc: konsole-devel, cblack, arvidhansson, ian, hannahk, Pixel_Lime, jraleigh, gennad, squeakypancakes, alexde, IohannesPetros, GB_2, trickyricky26, thsurrel, mglb, crozbo, ndavis, firef, ngraham, skadinna, maximilianocuria, aaronhoneycutt, hindenburg, mbohlender
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