Name: mc57594 Date: 03/13/97


The problem appears to be a bad Gif file. However, the one I
am using was created using imagetool to convert one of the
CDE images to a GIF (just for testing). I have attached the
ImageCanvas code, testing code, the html to launch, the
traceback output and the uuencoded guilty Gif file.


The codes were compiled using
javac -deprecation -d $DEVELHOME/classes
And run using
${JAVA_HOME}/bin/java -verbosegc -noverify

-----------------------------------------------------------------

package pal.awt;
//
// Copyright, Pair-a-Links Consulting Inc., 1997
//
// %Z%%M% %I% %E%
//

import java.awt.*;
import java.io.Serializable;
import pal.lang.Traceable;

//////////////////////////////////////////////////////////////////////
/**
This class provides a simple way to place a static image onscreen.
The canvas will automatically size itself to contain the image.

@author Carl Linkletter
@version %I% %E%
*/
//////////////////////////////////////////////////////////////////////
public class ImageCanvas extends Canvas
                        implements Serializable, Cloneable, Traceable {
    private static String internalVersion="%Z%%M% %I% %E%";
    private static String copyright="Copyright, Pair-a-Links Consulting In
c., 1997";

    private Image image;

//////////////////////////////////////////////////////////////////////
/**
Create a new ImageCanvas without an image in it. The size will be
set to 10X10 but you should call <tt>setImage</tt> and set the image
to display.
*/
//////////////////////////////////////////////////////////////////////
    public ImageCanvas() {
        super();
    }

//////////////////////////////////////////////////////////////////////
/**
Create a new ImageCanvas and display the image <tt>img</tt> in it.
@param img The image to be displayed. Note: if this image has not
already been downloaded, it will be now.

*/
//////////////////////////////////////////////////////////////////////
    public ImageCanvas(Image img) {
        super();
        if (img != null) setImage(img);
    }

//////////////////////////////////////////////////////////////////////
/**
Get the image which is being displayed.
@return The image which is being displayed or null if none has been set.
*/
//////////////////////////////////////////////////////////////////////
    public Image getImage() {
        return image;
    }
//////////////////////////////////////////////////////////////////////
/**
Return the minimum size allowed to display the image. This method is
used by the LayoutManager<tt>s</tt>.
@return The dimensions of the Image.
*/
//////////////////////////////////////////////////////////////////////
    public Dimension getMinimumSize() {
        Dimension ans;

        if (image != null) {
            ans = new Dimension(image.getWidth(this), image.getHeight(this));
            if (ans.height <= 0) ans.height = 10; // In case there are problems
            if (ans.width <= 0) ans.width = 10; // downloading.

        } else {
            ans = new Dimension(10,10);
        }

        return ans;
    }
//////////////////////////////////////////////////////////////////////
/**
Return the preferred size display the image. This method is
used by the LayoutManager<tt>s</tt>.
@return The dimensions of the Image.
*/
//////////////////////////////////////////////////////////////////////
    public Dimension getPreferredSize() {
        return getMinimumSize();
    }
//////////////////////////////////////////////////////////////////////
/**
This method is used to actually draw the image. Do not override.
*/
//////////////////////////////////////////////////////////////////////
    public void paint(Graphics g) {
        if (image != null) {
            g.drawImage(image, 0, 0, this);
        }
    }
//////////////////////////////////////////////////////////////////////
/**
Change the image to be displayed.
@param img The image to be displayed. The canvas will resize to fit
the new image size.
*/
//////////////////////////////////////////////////////////////////////
    public void setImage(Image img) {
        img.getHeight(this); // Throw a null pointer exception if img null

        MediaTracker mt = new MediaTracker(this);
        mt.addImage(img, 1);
        try {
            mt.waitForID(1); // Force Download so Dimensions are available
        } catch (InterruptedException e) { }

        image = img;
        Container parent = getParent();
        if (parent != null) { // If onscreen
            invalidate();
            parent.validate();
            repaint();
        }
    }
}



// Testing Code
import java.awt.*;
import java.applet.*;
import java.net.*;
import pal.awt.*;

public class foo extends Applet {
    Image img;
    ImageCanvas ic;
    
    public void init() {
        img = getMyImage(getParameter("image"));

        ic = new ImageCanvas(img);
        add(ic);
    }

    public Image getMyImage(String surl) {
        URL url = null;
        Image ans = null;

        try {
            url = new URL(surl);
        } catch (MalformedURLException e) {
            System.err.println("URL Exception");
            System.exit(1);
        }
        ans = Toolkit.getDefaultToolkit().getImage(url);
        return ans;
    }
}

-----------------------------------------------------------------
<html>
<applet code=foo.class height=100 width=100>
<param name=image value=file:/tmp/Leaves.gif>
</applet>
</html>
-----------------------------------------------------------------

SIGFPE 8* arithmetic exception
    si_signo [8]: SIGFPE 8* arithmetic exception
    si_errno [0]: Error 0
    si_code [1]: FPE_INTOVF [addr: 0xef4f6e68]

        stackbase=EE029000, stackpointer=EE0288B0

Full thread dump:
    "Image Fetcher 0" (TID:0xee76bb60, sys_thread_t:0xee028de0, state:R) prio=3
*current thread*
        sun.awt.image.ImageRepresentation.imageComplete(ImageRepresentation.java
:248)
        sun.awt.image.PixelStore.replay(PixelStore.java:241)
        sun.awt.image.PixelStore.replay(PixelStore.java:161)
        sun.awt.image.InputStreamImageSource.updateFromStore(InputStreamImageSou
rce.java:267)
        sun.awt.image.InputStreamImageSource.doFetch(InputStreamImageSource.java
:211)
        sun.awt.image.ImageFetcher.fetchloop(ImageFetcher.java:139)
        sun.awt.image.ImageFetcher.run(ImageFetcher.java:116)
    "Screen Updater" (TID:0xee76cd40, sys_thread_t:0xee006de0, state:CW) prio=4
        java.lang.Object.wait(Object.java)
        sun.awt.ScreenUpdater.nextEntry(ScreenUpdater.java:78)
        sun.awt.ScreenUpdater.run(ScreenUpdater.java:98)
    "AWT-Motif" (TID:0xee76caf0, sys_thread_t:0xee04ade0, state:CW) prio=5
        java.lang.Thread.run(Thread.java)
    "AWT-Input" (TID:0xee76cad0, sys_thread_t:0xee06cde0, state:MW) prio=5
    "AWT-EventQueue-0" (TID:0xee76cab8, sys_thread_t:0xee08ede0, state:CW) prio=
5
        java.awt.EventQueue.getNextEvent(EventQueue.java)
        java.awt.EventDispatchThread.run(EventDispatchThread.java)
    "thread applet-foo.class" (TID:0xee76bd78, sys_thread_t:0xee353de0, state:CW
) prio=4
        java.awt.MediaTracker.waitForID(MediaTracker.java:515)
        java.awt.MediaTracker.waitForID(MediaTracker.java:476)
        pal.awt.ImageCanvas.setImage(ImageCanvas.java:114)
        pal.awt.ImageCanvas.<init>(ImageCanvas.java:48)
        foo.init(foo.java:13)
        sun.applet.AppletPanel.run(AppletPanel.java:273)
        java.lang.Thread.run(Thread.java)
    "Finalizer thread" (TID:0xee75f220, sys_thread_t:0xee375de0, state:CW) prio=
1
    "Async Garbage Collector" (TID:0xee75f1d8, sys_thread_t:0xee397de0, state:R)
 prio=1
    "Idle thread" (TID:0xee75f190, sys_thread_t:0xee3b9de0, state:R) prio=0
    "Clock" (TID:0xee75f0d0, sys_thread_t:0xee3dbde0, state:CW) prio=12
    "main" (TID:0xee75f0a8, sys_thread_t:0x6e650, state:CW) prio=5
Monitor Cache Dump:
         sun.awt.image.PixelStore8@EE76B7C0/EE7E4AD8 (key=0xee76b7c0): monit
or owner ee028de0: "Image Fetcher 0"
         java.awt.MediaTracker@EE76B760/EE7E8410 (key=0xee76b760): unowned
        Waiting to be notified:
            "thread applet-foo.class"
         java.awt.EventQueue@EE76CA68/EE7DF618 (key=0xee76ca68): unowned
        Waiting to be notified:
            "AWT-EventQueue-0"
         unknown key (key=0xee397de0): monitor owner ee397de0: "Async Garbag
e Collector"
         sun.awt.motif.MToolkit@EE76CA58/EE7CD2B8 (key=0xee76ca58): monitor
owner ee028de0: "Image Fetcher 0"
        Waiting to enter:
            "AWT-Input"
        Waiting to be notified:
            "AWT-Motif"
         sun.awt.ScreenUpdater@EE76CD40/EE7DBDD8 (key=0xee76cd40): unowned
        Waiting to be notified:
            "Screen Updater"
Registered Monitor Dump:
    Thread queue lock: unowned
        Waiting to be notified:
            "main"
    Name and type hash table lock: unowned
    String intern lock: unowned
    JNI global reference lock: unowned
    BinClass lock: unowned
    Class loading lock: unowned
    Java stack lock: unowned
    Code rewrite lock: unowned
    Heap lock: unowned
    Has finalization queue lock: unowned
    Finalize me queue lock: unowned
        Waiting to be notified:
            "Finalizer thread"
    Monitor IO lock: unowned
    Child death monitor: unowned
    Event monitor: unowned
    I/O monitor: unowned
    Alarm monitor: unowned
        Waiting to be notified:
            "Clock"
    Sbrk lock: unowned
    Monitor cache expansion lock: unowned
    Monitor registry: monitor owner ee028de0: "Image Fetcher 0"
Thread Alarm Q:

-----------------------------------------------------------------

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end

company - Summit Network Integrators Corp. , email - ###@###.###
======================================================================