As requested, here a small runnable test. When you run it please start the JVM
with something like "-XX:NewSize=256m -XX:MaxNewSize=256m", elsehow the memory
message wont be of much use.
Here comes the code:
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import java.awt.BorderLayout;
import java.awt.Color;
import java.awt.Dimension;
import java.awt.Graphics;
import java.awt.Image;
import java.awt.event.ActionEvent;
import java.awt.event.ActionListener;
import java.awt.event.ItemEvent;
import java.awt.event.ItemListener;
import java.awt.event.WindowAdapter;
import java.awt.event.WindowEvent;
import java.awt.image.BufferedImage;
import java.awt.image.MemoryImageSource;
import java.util.Random;
import javax.swing.JButton;
import javax.swing.JCheckBox;
import javax.swing.JFrame;
import javax.swing.JPanel;
/**
* Small example to compare MemoryImageSource and BufferedImage.
*
* @author kif
*
*/
public class SetPixelTest {
private static MyDrawingArea _mda;
private static boolean _use_mis = false;
private static JCheckBox _jcb_use_mis;
public static class MyDrawingArea extends JPanel {
private static int IMG_WIDTH = 256;
private static int IMG_HEIGHT = 256;
// either use a BufferedImage ...
private BufferedImage _bimg;
// ... or a MemoryImageSource
private Image _img;
protected int[] _pixels;
protected MemoryImageSource _mis;
public MyDrawingArea() {
setPreferredSize(new Dimension(400,400));
setBackground(Color.black);
_bimg = new BufferedImage(IMG_WIDTH,IMG_HEIGHT,
BufferedImage.TYPE_INT_ARGB);
_pixels = new int[IMG_WIDTH*IMG_HEIGHT];
_mis = new MemoryImageSource(IMG_WIDTH, IMG_HEIGHT,
_pixels, 0, IMG_WIDTH);
_mis.setAnimated(true);
_img = createImage(_mis);
}
public void random_fill() {
Random rand = new Random();
int r, g, b, rgb;
if (_use_mis) { // MemoryImage Source
int pixel_counter = 0;
for (int y=0; y<IMG_HEIGHT; y++) {
for (int x=0; x<IMG_WIDTH; x++) {
r = rand.nextInt() % 256;
g = rand.nextInt() % 256;
b = rand.nextInt() % 256;
rgb = 0xff<<24 | r<<16 | g<<8 |
b;
_pixels[pixel_counter++] = rgb;
}
}
_mis.newPixels();
} else { // BufferedImage
for (int y=0; y<IMG_HEIGHT; y++) {
for (int x=0; x<IMG_WIDTH; x++) {
r = rand.nextInt() % 256;
g = rand.nextInt() % 256;
b = rand.nextInt() % 256;
rgb = 0xff<<24 | r<<16 | g<<8 |
b;
_bimg.setRGB(x, y, rgb);
}
}
}
repaint();
}
public void paint(Graphics g) {
if (_use_mis) { // MemoryImage Source
g.drawImage(_img, 0, 0, getWidth(),
getHeight(), this);
} else { // BufferedImage
g.drawImage(_bimg, 0, 0, getWidth(),
getHeight(), this);
}
}
}
/**
* @param args
*/
public static void main(String[] args) {
JFrame window = new JFrame("Pixel Performance Test");
_mda = new MyDrawingArea();
// if someone closes the main window, the program shall end.
window.addWindowListener(new WindowAdapter() {
public void windowClosing(WindowEvent e) {
System.exit(0);
}
});
JButton jb_fill = new JButton("Random Fill");
jb_fill.addActionListener(new ActionListener() {
public void actionPerformed(ActionEvent e) {
for (int i=0; i<10; i++) {
_mda.random_fill();
}
System.out.println((Runtime.getRuntime().totalMemory()-Runtime.getRuntime().freeMemory())/(1024*1024)
+" /
"+Runtime.getRuntime().totalMemory()/(1024*1024)+"MB");
}
});
_jcb_use_mis = new JCheckBox("Use MemoryImageSource");
_jcb_use_mis.addItemListener(new ItemListener() {
public void itemStateChanged(ItemEvent e) {
_use_mis = _jcb_use_mis.isSelected();
}
});
JPanel buttons = new JPanel();
buttons.add(jb_fill);
buttons.add(_jcb_use_mis);
window.setLayout(new BorderLayout());
window.add(_mda, BorderLayout.CENTER);
window.add(buttons, BorderLayout.SOUTH);
window.pack();
window.setVisible(true);
}
}
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Just run it and press the button a few times. Then click on the Checkbox and
repeat.
MfG;
ChaosE
[Message sent by forum member 'chaose71' (chaose71)]
http://forums.java.net/jive/thread.jspa?messageID=269278
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