static int widthToHeight(int w, int h, int newWidth) {
  ret heightForWidth(w, h, newWidth);
}

meta-for BufferedImage also as WidthAndHeight {
  static int widthToHeight(BufferedImage img, int newWidth) {
    ret heightForWidth(img.getWidth(), img.getHeight(), newWidth);
  }
  
  static int widthToHeight(int newWidth, BufferedImage img) {
    ret widthToHeight(img, newWidth);
  }
}