Name: bsC130419 Date: 05/31/2001


java version "1.4.0-beta"
Java(TM) 2 Runtime Environment, Standard Edition (build 1.4.0-beta-b65)
Java HotSpot(TM) Client VM (build 1.4.0-beta-b65, mixed mode)


I did a new standalone test of image scaling with the new JDK1.4beta and was
sad to see it slower than JDK1.3. The program that generates the following
numbers is below. It uses a BufferedImage.TYPE_INT_ARGB_PRE (the fastest one I
found). I also tried it on TYPE_INT_ARGB. I'm running on an IBM T21 ThinkPad
with Windows 2000. The bottom line is that JDK1.3 is about 30% faster for
ARGB_PRE and about 10% faster for ARGB.

This is a crucial problem since my entire project revolves around animated
zooming of images and other graphics. See the Open Source Jazz toolkit to
understand why it is important at
http://www.cs.umd.edu/hcil/jazz

Timing results:

JDK1.3 - TYPE_INT_ARGB
----------------------
$ java ZoomImage
total time = 2854, 142 ms/frame, 7 fps
total time = 2694, 134 ms/frame, 7 fps
total time = 2663, 133 ms/frame, 7 fps
total time = 2654, 132 ms/frame, 7 fps
total time = 2633, 131 ms/frame, 7 fps
total time = 2644, 132 ms/frame, 7 fps

JDK1.4beta - TYPE_INT_ARGB
--------------------------
$ /jdk1.4b/bin/java ZoomImage
total time = 3104, 155 ms/frame, 6 fps
total time = 2954, 147 ms/frame, 6 fps
total time = 2924, 146 ms/frame, 6 fps
total time = 2914, 145 ms/frame, 6 fps
total time = 2894, 144 ms/frame, 6 fps
total time = 2895, 144 ms/frame, 6 fps

JDK1.3 - TYPE_INT_ARGB_PRE
--------------------------
$ java ZoomImage
total time = 2844, 142 ms/frame, 7 fps
total time = 2674, 133 ms/frame, 7 fps
total time = 2633, 131 ms/frame, 7 fps
total time = 2624, 131 ms/frame, 7 fps
total time = 2614, 130 ms/frame, 7 fps

JDK1.4beta - TYPE_INT_ARGB_PRE
------------------------------
$ /jdk1.4b/bin/java ZoomImage
total time = 4176, 208 ms/frame, 4 fps
total time = 3945, 197 ms/frame, 5 fps
total time = 3906, 195 ms/frame, 5 fps
total time = 3895, 194 ms/frame, 5 fps
total time = 3896, 194 ms/frame, 5 fps

Test program
===============

import java.awt.*;
import java.awt.font.*;
import java.awt.geom.*;
import java.awt.event.*;
import java.awt.image.*;
import javax.swing.*;

public class ZoomImage extends JFrame {
    int width = 800;
    int height = 800;

    public ZoomImage() {
setBounds(100, 100, width, height);
setVisible(true);
Component comp = new ZoomImageComponent();
comp.setBounds(0, 0, width, height);
getContentPane().add(comp);

addWindowListener(new WindowAdapter() {
public void windowClosing(WindowEvent e) {
System.exit(0);
}
});
    }

    static public void main(String[] args) {
new ZoomImage();
    }
}

class ZoomImageComponent extends JComponent {
    float mag = 1.0f;
    float magStep = 1.01f;
    int i = 0;
    int iw = 800;
    int ih = 800;
    BufferedImage image = null;
    int imageType = BufferedImage.TYPE_INT_ARGB_PRE;

    public ZoomImageComponent() {
createImage();

addMouseListener(new MouseAdapter() {
public void mousePressed(MouseEvent e) {
if ((e.getModifiers() & MouseEvent.BUTTON1_MASK) ==
MouseEvent.BUTTON1_MASK) { // Left button only
magStep = 1.02f;
} else {
magStep = 0.98f;
}

long startTime = System.currentTimeMillis();
int frames = 20;
for (i=0; i<frames; i++) {
mag *= magStep;
repaint();
RepaintManager.currentManager
(ZoomImageComponent.this).paintDirtyRegions();
}
long endTime = System.currentTimeMillis();
long dt = (endTime - startTime);
System.out.println("total time = " + dt + ", " + dt / frames
+ " ms/frame, " + (frames * 1000 / dt) + " fps");
}
});
    }

    public void paintComponent(Graphics g) {
Graphics2D g2 = (Graphics2D)g;
g2.setRenderingHint(RenderingHints.KEY_ANTIALIASING,
RenderingHints.VALUE_ANTIALIAS_OFF);
g2.setRenderingHint(RenderingHints.KEY_RENDERING,
RenderingHints.VALUE_RENDER_SPEED);
AffineTransform at1 = AffineTransform.getTranslateInstance(0.0f, 0.0f);
AffineTransform at2 = AffineTransform.getScaleInstance(mag, mag);
g2.setTransform(at1);
g2.transform(at2);

g2.drawImage(image, 0, 0, this);
    }

    void createImage() {
        image = new BufferedImage(iw, ih, imageType);

        for (int i = 2; i < iw; i +=3) {
            for (int j = 2; j < ih; j +=3) {
                image.setRGB(i, j, java.awt.Color.red.getRGB());
                image.setRGB(i-1, j, java.awt.Color.blue.getRGB());
                image.setRGB(i+1, j, java.awt.Color.green.getRGB());
                image.setRGB(i, j-1, java.awt.Color.yellow.getRGB());
                image.setRGB(i, j+1, java.awt.Color.black.getRGB());
                image.setRGB(i-1, j+1, java.awt.Color.white.getRGB());
                image.setRGB(i+1, j+1, java.awt.Color.white.getRGB());
                image.setRGB(i-1, j-1, java.awt.Color.white.getRGB());
                image.setRGB(i+1, j-1, java.awt.Color.white.getRGB());
            }
        }
    }
}
(Review ID: 125171)
======================================================================


ingrid.yao@Eng 2001-06-14

It is even worse on JDK1.3.1 for both TYPE_INT_ARG and TYPE_INT_ARG_PRE

E:\CAP\bug\umd>c:\jdk1.3.1\bin\java ZoomImagePRE
total time = 4347, 217 ms/frame, 4 fps
total time = 4116, 205 ms/frame, 4 fps
total time = 4086, 204 ms/frame, 4 fps
total time = 4076, 203 ms/frame, 4 fps
total time = 4056, 202 ms/frame, 4 fps
total time = 4045, 202 ms/frame, 4 fps
total time = 4056, 202 ms/frame, 4 fps


E:\CAP\bug\umd>c:\jdk1.3.1\bin\java ZoomImage
total time = 4246, 212 ms/frame, 4 fps
total time = 4086, 204 ms/frame, 4 fps
total time = 4056, 202 ms/frame, 4 fps
total time = 4026, 201 ms/frame, 4 fps
total time = 4156, 207 ms/frame, 4 fps
total time = 4026, 201 ms/frame, 4 fps
total time = 4026, 201 ms/frame, 4 fps