static BufferedImage scaleBufferedImageToMaxWidthOrHeight(WidthAndHeight size, BufferedImage img) {
  ret img == null ?: scaleBufferedImageToMaxWidthOrHeight(size.w(), size.h(), img);
}

static BufferedImage scaleBufferedImageToMaxWidthOrHeight(int maxW, int maxH default maxW, BufferedImage img) {
  if (img == null) null;
  int w = img.getWidth(), h = img.getHeight();
  if (w <= maxW && h <= maxH) ret img;
  double scale = min(doubleRatio(maxW, w), doubleRatio(maxH, h));
  ret scaleImage(img, scale);
}

static BufferedImage scaleBufferedImageToMaxWidthOrHeight(BufferedImage img, int max) {
  ret scaleBufferedImageToMaxWidthOrHeight(max, img);
}