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Re: Text rendering artifacts

On Sep 4, 2008, at 5:36 AM, Ken Orr wrote:

Does anyone know why resizing a window can cause weird text drawing artifacts (see below)? Running with - Dapple.awt.graphics.UseQuartz=true doesn't seem to help much.

Good text:
<good_text.png>
Bad text (after tiny resize):
<bad_text.png>

Here's some sample code to reproduce the problem:

public class TextAntialiasingTest {

public static void main(String[] args) {
JLabel button = new JLabel("A Button With Some Text", SwingConstants.CENTER);

       JFrame frame = new JFrame();
       frame.add(button);
       frame.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
       frame.setSize(200,100);
       frame.setLocationRelativeTo(null);
       frame.setVisible(true);
   }

}

JLabels (like most Aqua controls) are setOpaque(false) by default. If you put the label on a panel (which is setOpaque(true)), it's will be asked to paint it's background color before the label paints again.

Hope this help explains what's going on,
Mike Swingler
Java Runtime Engineer
Apple Inc.
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