static short rgbToHi15(RGB rgb) {
  ret rgbIntToHi15(rgb.asInt());
}

static short rgbToHi15(Color color) {
  ret rgbIntToHi15(colorToInt(color));
}

static short rgbToHi15(int rgb) {
  ret rgbIntToHi15(rgb);
}

static short rgbToHi15(int r, int g, int b) {
  r >>= 3;
  g >>= 3;
  b >>= 3;
  ret (short) ((r << 10) | (g << 5) | b);
}

Began life as a copy of #1035587