Super-/subscripts finally work in 1.5. But they look horrible - it seems
as if the vertical shift is done twice - once by the Transform in Font,
and then again in sun.font.TextLine (CoreMetrics.ssOffset). Or is it just
too large and this double shift is intentional?

Compare: http://www.chka.de/tmp/standard.png
        http://www.chka.de/tmp/hacked.png

where the latter was done with a modified TextLine.
I think anyone will agree that the second one looks better.

Any comments?

import java.awt.*;
import java.awt.font.*;
import java.awt.geom.*;

import java.text.*;

import java.util.List;
import java.util.*;

import javax.swing.*;

// this is no code of high quality!
public class SuperTest
{
   // for simplicity
   private static FontRenderContext context = new FontRenderContext(new AffineTransform(), true, true);

   public static void main(String[] args)
   {
    Font plain = new Font("Serif", Font.PLAIN, 100);

    AttributedString s = new AttributedString("ABCDEFGH");

       s.addAttribute(TextAttribute.FONT, plain);
    s.addAttribute(TextAttribute.FONT, plain.deriveFont(java.util.Collections.singletonMap(TextAttribute.SUPERSCRIPT, new Integer(1))), 1, 2);
    s.addAttribute(TextAttribute.FONT, plain.deriveFont(java.util.Collections.singletonMap(TextAttribute.SUPERSCRIPT, new Integer(-1))), 6, 7);

    TextLayout m = new TextLayout(s.getIterator(), context);
   
       JFrame f = new JFrame("TextLayout");

       f.getContentPane().add(new TLComponent(Arrays.asList(new Object[] { m })));
       
       f.pack(); f.show();
   }

   protected static class TLComponent
       extends JComponent
   {
    private static final int INSETS = 50;

       private List textLayouts;

       public TLComponent(List l)
       {
           textLayouts = l;
       }

       
       public Dimension getPreferredSize()
       {
           Dimension result = new Dimension();

           for (Iterator i = textLayouts.iterator(); i.hasNext();)
           {
               TextLayout l = (TextLayout)i.next();

               result.width = Math.max(result.width, (int)Math.ceil(l.getAdvance()));

               result.height += (int)Math.ceil(l.getAscent() + l.getDescent() + 2 * l.getLeading());
           }

           result.width += 2 * INSETS;
           result.height += 2 * INSETS;

           return result;
       }

       protected void paintComponent(Graphics g)
       {
       Graphics2D h = (Graphics2D)g;

       h.setColor(Color.white);

       h.fillRect(0, 0, getWidth(), getHeight());

       h.setColor(Color.black);

           int y = INSETS;
           int x = INSETS;

       if (context.isAntiAliased())
       {
        h.setRenderingHint(RenderingHints.KEY_ANTIALIASING, RenderingHints.VALUE_ANTIALIAS_ON);
        h.setRenderingHint(RenderingHints.KEY_TEXT_ANTIALIASING, RenderingHints.VALUE_TEXT_ANTIALIAS_ON);
       }

       if (context.usesFractionalMetrics())
       {
        h.setRenderingHint(RenderingHints.KEY_FRACTIONALMETRICS, RenderingHints.VALUE_FRACTIONALMETRICS_ON);
       }

           for (Iterator i = textLayouts.iterator(); i.hasNext();)
           {
               TextLayout l = (TextLayout)i.next();

               l.draw(h, x, y + l.getAscent());

               y += Math.ceil(l.getAscent() + l.getDescent() + 2 * l.getLeading());
           }
       }
   }

}

Christian