Re: Screen recording needs a performance boost.

pyro9219@gmail.com wrote:


Of course it is! The code is setting up try/catch constructs,
instantiating objects, updating a number of GUI elements,
scaling images, ..and creating a screencapture of the entire
screen!
...


Here is my altered code, and test results..

Oh, and while I recall, please post SSCCE's, rather
than code snippets..
<http://www.physci.org/codes/sscce.html>

<sscce>
import java.awt.*;
import javax.swing.*;

public class AnimatedScreenCapture extends JFrame {

  JLabel jLabel1;
  Robot robot;

  Rectangle rectangle1;

  int scaleX;
  int scaleY;

  public AnimatedScreenCapture() {
    super("Animated Screen Capture");
    setDefaultCloseOperation( JFrame.EXIT_ON_CLOSE );
    jLabel1 = new JLabel();
    jLabel1.setPreferredSize(new Dimension(400,300));
    getContentPane().add( jLabel1 );

    rectangle1 = new Rectangle(100,100);
    scaleX = Toolkit
        .getDefaultToolkit()
        .getScreenSize()
        .width / 2;
    scaleY =Toolkit
        .getDefaultToolkit()
        .getScreenSize()
        .height / 2;
    try {
      robot = new java.awt.Robot();
    } catch (AWTException e) {
      e.printStackTrace();
      System.exit(-1);
    }
  }

  public void startCapture2() {
    long t0 = System.currentTimeMillis();
    int i = 0;
    int fps = 0;

    while (true) {
      i++;
      long t1 = System.currentTimeMillis();
      int seconds = (int) (t1-t0)/1000;

      if (i%1000==0 && seconds>0) {
        fps = i / seconds;
        this.setTitle("FPS: " + fps);
      }

      Image screen_capture = robot
        .createScreenCapture(rectangle1)
        .getScaledInstance(scaleX, scaleY, Image.SCALE_FAST)
        ;

      jLabel1.setIcon(new ImageIcon(screen_capture));
      jLabel1.update(jLabel1.getGraphics());
    }
  }

  public static void main(String[] args) throws AWTException {
    Thread t = new Thread() {
      public void run() {
        AnimatedScreenCapture asc = new AnimatedScreenCapture();
        asc.pack();
        asc.setVisible(true);
        asc.startCapture2();
      }
    };
    SwingUtilities.invokeLater(t);
  }
}
</sscce>

Results:
FPS Conditions
3 original code (screen size 1024x768)
3 instantiated robot in constructor
4 replaced try/catch on division with test for 0.
20-22 screencap2 with rect of 100,100
250-290+ " " " " " and no scale
520-600+ " " " " " and no label update
540+ " " " " " and no label update/scale

It seems most of the time is taken up scaling the image
and updating the GUI. This should be done in a separate
thread.

This is not a good project for a newbie.

--
Andrew Thompson
http://www.athompson.info/andrew/

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