static double scaleToFitInside(BufferedImage image, Component c) {
  ret scaleToFitInside(image, c.getWidth(), c.getHeight());
}

static double scaleToFitInside(BufferedImage image, int w, int h default w) {
  int iw = image.getWidth(), ih = image.getHeight();
  ret min(doubleRatio(h, ih), doubleRatio(w, iw));
}

Began life as a copy of #1034223