FindClosestColor
map->index_map[color] = FindClosestColor(rgbColor, palette);
map->inversion_map[index] = FindClosestColor(inverted, palette);
fColor8 = FindClosestColor(SystemPalette(), fColor32);
map->index_map[color] = FindClosestColor(rgbColor, palette);
map->inversion_map[index] = FindClosestColor(inverted, palette);