Re: How to detect hardware acceleration?

> To let the user decide to enable such an option is OK.
>
> However I think possibly there still exists a performance bug. The test case below causes an avererage of 5% CPU utilization for opaque window and 50% CPU utilization for non-opaque windows even if the animated panel is placed on an opaque panel (tested on the older machine).
>
> [code]
> public class NonOpaqueWindowPerformanceTest extends JFrame
> {
>   public NonOpaqueWindowPerformanceTest()
>   {
>     super();    
>     setLayout(new BorderLayout());
>
>     JPanel p = new JPanel();
>     p.setBorder(new LineBorder(Color.GREEN));
>     p.setBackground(Color.RED);
>     p.setOpaque(true);
>
>     final JPanel p2 = new JPanel();
>     p2.setOpaque(true);
>     p2.setBorder(new LineBorder(Color.blue));
>     p2.setPreferredSize(new Dimension(300,300));    
>     p.add(p2);
>    
>     add(p);
>     //remarking the following line means 90% less CPU-utilization on Windows XP
>     setWindowNonOpaque(this);
>    
>     setTitle(getClass().getSimpleName());
>     setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
>     setSize(800, 600);    
>     setLocationRelativeTo(null);
>     setVisible(true);
>    
>     new Thread(){
>       public void run()
>       {
>         while (true)
>         {  
>           try
>           {
>             Thread.sleep(50);
>           }
>           catch (InterruptedException e)
>           {
>             e.printStackTrace();
>           }
>
>           EventQueue.invokeLater(new Runnable()
>           {
>             public void run()
>             {
>               Color color = new Color(new Random().nextInt(0xFFFFFF));
>               p2.setBackground(color);
>             }      
>           });
>         }
>       }      
>     }.start();
>   }
>  
>   private void setWindowNonOpaque(Window w)
>   {
>     try
>     {
>       Class<?> c = Class.forName("com.sun.awt.AWTUtilities");
>       Method m = c.getMethod("setWindowOpaque", Window.class, boolean.class);
>       m.invoke(null, w, false);
>     }
>     catch (Exception e)
>     {
>       e.printStackTrace();
>     }    
>   }
>
>   public static void main(String[] args) throws Exception
>   {
>     EventQueue.invokeLater(new Runnable(){
>       public void run()
>       {
>         JFrame.setDefaultLookAndFeelDecorated(true);
>         new NonOpaqueWindowPerformanceTest();
>       }      
>     });
>   }  
> }
> [/code]
> [Message sent by forum member 'wzberger' (wzberger)]
>
> http://forums.java.net/jive/thread.jspa?messageID=287511
>
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