Name: rm29839 Date: 01/22/98


drawImage is about 5X slower on Java1.2 than it is
on Java 1.1.5. I'm running on a 3-year-old GW2K
Pentium-90, no MMX if that matters.

The following code produces a 400 X 500 blue box with
a diagonal line across it. When I iconize it and
deiconize it, it takes about 80 msec per drawImage
on Java 1.2 and more like 16 on Java 1.1.5. This
is a serious problem for high performance code,
so I'd rank it as a "performance bug".

To see the problem produced in all of its dramatic glory, just resize the box

import java.awt.*;
import java.awt.event.*;

class Test4 extends Frame
{
  Image img;

  Test4()
  {
    addWindowListener(new WindowAdapter()
{
public void windowClosing(WindowEvent e)
{
System.out.println("firing down!");
System.exit(0);
}
}
);
    setLayout(null);
  }

  void init()
  {
    Dimension d = getSize();
    img = this.createImage(d.width, d.height);
    if ( img == null )
      System.out.println("createImage returned null.");
    Graphics g = img.getGraphics();

    g.setColor(Color.blue);
    g.fillRect(0,0,d.width,d.height);
    g.setColor(Color.black);
    g.drawLine(0,0,d.width,d.height);

  }

  public void paint(Graphics g)
  {
    int reps = 100;
    Dimension d = getSize();
    if ( img == null )
      init();
    if ( img == null )
      System.out.println("Trouble initializing img");

    if ( img != null )
      {
long t1 = System.currentTimeMillis();

for (int j=0; j < reps; j++)
{
boolean done =
g.drawImage(img,
0, 0, d.width, d.height,
null);
if ( ! done )
System.out.println("!!! Not Done");
}

long t2 = System.currentTimeMillis();
System.out.println("Frame: " + g.getClip() + " " + (t2-t1)/reps +
" millis ");
      }
  }

  public static void main(String args[])
  {
    System.out.println("Firing up");
    Test4 f = new Test4();
    f.setSize(400, 500);
    f.show();
  }

}
(Review ID: 23783)
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