static BufferedImage renderShape_antiAlias(Color bg default Color.white, Shape shape, int w, int h) {
  BufferedImage img = newBufferedImage(w, h, bg);
  Graphics2D g = antiAliasOn(img.createGraphics());
  g.setColor(Color.black);
  g.fill(shape);
  ret img;
}

// uses shape.getBounds()
static BufferedImage renderShape_antiAlias(Color bg default Color.white, Shape shape) {
  if (shape == null) null;
  Rect r = toRect(shape.getBounds());
  
  BufferedImage img = newBufferedImage(max(1, r.w), max(1, r.h), bg);
  Graphics2D g = antiAliasOn(img.createGraphics());
  g.translate(-r.x, -r.y);
  g.setColor(Color.black);
  g.fill(shape);
  ret img;
}