effectiveColors function
Packed-RGB fg/bg after applying inverse (swap) and dim (darken fg).
Implementation
({int fg, int bg}) effectiveColors(int flags, int rawFg, int rawBg) {
var fg = rawFg, bg = rawBg;
if (flags & kFlagInverse != 0) {
final t = fg;
fg = bg;
bg = t;
}
if (flags & kFlagDim != 0) {
int dim(int c) => (c * 0.66).round().clamp(0, 255);
fg = (dim(fg >> 16 & 0xFF) << 16) | (dim(fg >> 8 & 0xFF) << 8) | dim(fg & 0xFF);
}
return (fg: fg, bg: bg);
}