I only see a bunch of small collections (I tried on
6u10) - probably because for each pixel you set an
int[1] array is created.
I don't see the heap growing. Run it with -verbose:gc ,
see what it says.
If you want to try the approach Clemens suggested, you'll
only need to change your random_fill method:
import java.awt.image.DataBufferInt;
...
int data[] = ((DataBufferInt)(_bimg.getRaster().getDataBuffer())).getData();
for (int i = 0; i < data.length; i++) {
r = rand.nextInt() % 256;
g = rand.nextInt() % 256;
b = rand.nextInt() % 256;
data[i] = 0xff<<24 | r<<16 | g<<8 | b;
}
(in real life examples you'll need to calculate
the index for each element based on raster's
data)
Note that you can only cast to DataBufferInt here
because you create an INT_RGB image.
Also, getting the DataBuffer of a BufferedImage
will forfeit any possibility of caching this image
in video memory. For this particular case
it doesn't matter that much since you're updating
it on every frame, but it is something that needs
to be considered.
You can use DataBuffer to set pixels without
having to reference the array directly - by using
DataBufferInt.setElem(i, val). This will keep the
possibility of the image being cached in vram, but
may be slightly slower than direct array access
approach.
Thanks,
Dmitri
[EMAIL PROTECTED] wrote:
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:
-----------------------------------------------------------------------------------------------------------------------
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);
}
}
-----------------------------------------------------------------------------------------------------------------------
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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