Kde4 style:reverse fonts color if needed

Actually, if in a theme/style the background of something
(toolbar, menubar, menus , statusbar) is dark and the fonts are dark , or it's light and the fonts are white, you'll read nothing (check screen #1, this is the best I could do to keep reading
the kmenu and the kicker icon popups).

Adding a check "per part" (one check for menubar, one for toolbar, etc) to reverse
the font color (negate if you prefer:
Red=255-Red,Green=255-Green,Blue=255-Blue)
might fix this.
As a result all fonts would be highly readable as per screenshot #2.

Here is an example of the algorithm:
(140 is 60% luminosity, 80 is 30% luminosity)
if ( bgcolor.luminosity is less than 140 AND fontcolor.luminosity is less than 80 ) OR (bgcolor.luminosity is more than 115 AND fontcolor.luminosity is more than 175) then
{reverse font color algorithm}.

This would help in darker theme creation.