Customer bug report from ###@###.###:

In trying to implement transparent objects, we enountered the following bugs
in JDK Beta 2.0

    - PixelGrabber hangs occasionally
    - IndexColorMap has a bug in it. Try the following experiment: create
      an offscreen image, draw a white (255, 255, 255) rectangle into it.
      Then use PixelGrabber to get its pixels: they'll all be blue. Similarly,
      red pixels (255, 0, 0) have a similar problem (I don't remember the
      new color)
    - PixelGrabber does not work for framebuffers > 8-bit wide. Get mostly
      black pixels, occasionally, random colored pixels

_____fp.bugs 3272_____: PixelGrabber hang
This hang occurs under Solaris as well. Just get an imagefile for this applet. Contact hagen@eng for a ready-made html and image file.
I would not be surprised if this bug had something to do with 1235466 or 1234421.
/*
 *
 * Bug: When running this applet with the appletviewer application
 * using 'Version 1.0 Beta 2: Java(tm) Developers Kit' for Windows 95,
 * I can get a hang in PixelGrabber.grabPixels().
 *
 *
 * David Lipscomb
 * ###@###.###
 * 415 778-0931
 * mBED Software
 */

import java.awt.image.*;
import java.awt.*;
import java.net.*;
import java.applet.*;

/**
 * Bug Class.
 */
public class Bug extends Applet implements Runnable
{
Thread fRunner;
Image fImage;

static String IMAGEFILE = "imagefile";
static final int SLEEPTIME = 20 /* miliseconds */;

public void init()
{
fRunner = null;
fImage = null;
} /* init */

public String getAppletInfo()
{
return new String("Pixel Grabber Test");
} /* getAppletInfo */

public void start()
{
fRunner = new Thread(this);
fRunner.start();
} /* start */

public void stop()
{
fRunner.stop();
} /* stop */

public void run()
{
// Load up the image. And guarantee that it's in memory

fImage = getImage(getDocumentBase(), getParameter(IMAGEFILE));
prepareImage(fImage,this);
while ((checkImage(fImage, this) & ImageObserver.ALLBITS) == 0)
doSleep();

// Loop forever
while (true)
{
System.gc();
doSleep();
}

} /* run */

synchronized public boolean mouseDown(Event evt, int x, int y)
{

int width = fImage.getWidth(this);
int height = fImage.getHeight(this);
int pixels[] = new int[width*height];
PixelGrabber pg = new
PixelGrabber(fImage,0,0,width,height,pixels,0,width);

try
{
while (true)
{
System.out.println("GRABBING STARTED");
pg.grabPixels(); // *** HANGS HERE EVENTUALLY ***
System.out.println("GRABBING COMPLETE");
System.out.println("");
/*
if (pg.status() == 0)
{
System.out.println("Grab failed - retrying");
pg = null;
System.gc();
doSleep();
pg = new
PixelGrabber(fImage,0,0,width,height,pixels,0,width);
}
else
*/
break;
}
}
catch (Exception e)
System.out.println(e.toString());


return super.mouseDown(evt, x, y);
} /* mouseDown */

synchronized public void paint(Graphics g)
{
g.drawString(getAppletInfo(), 10, 10);
if (fImage != null)
g.drawImage(fImage, 10, 10, this);

} /* paint */


private void doSleep()
{
try
Thread.currentThread().sleep(SLEEPTIME);
catch (InterruptedException e)
;
} /* doSleep */


} /* class Bug */