useWhiteForeground function
Implementation
bool useWhiteForeground(Color color, {double bias = 1.0}) {
// Old:
// return 1.05 / (color.computeLuminance() + 0.05) > 4.5;
// New:
int v = sqrt(pow(color.red, 2) * 0.299 +
pow(color.green, 2) * 0.587 +
pow(color.blue, 2) * 0.114)
.round();
return v < 130 * bias ? true : false;
}