Previously it used "contrast" and "brightness" values that were
computed in strange ways. Now it behaves more like the other
color computation functions and deals with the "flags" directly.
Comparing many controls, colors on button frames in all states appear
to be the same (or nearly the same, within 1-2 RGB values) before
and after this change.
Change-Id: Ia6d696c29fc76c73c88cc97af97ea45e1ff089ff
Reviewed-on: https://review.haiku-os.org/c/haiku/+/9321
Reviewed-by: waddlesplash <[email protected]>
Augustin Cavalier
8de71284ed