From: tmb
This does not look like form output to me.


Well, maybe I don't entirely understand how ImageConsumer is supposed
to work (comments/corrections appreciated), but the code below
actually causes a GPF under Windows95 and also returns an illegal
index for an IndexColorModel, neither of which should happen.

For our applications, this bug is extremely serious. So, a workaround
or fix would be appreciated.

Thomas.

// This little program demonstrates several bugs in JDK-1.0:
//
// -- under 8bpp, Windows95, there is an exception from deep within Windows at (1)
// -- under 16bpp or 32bpp, Windows95, this simply crashes with an "illegal operation"
// -- under 8bpp, X11/Linux, it works and seems to do the right thing

import java.lang.*;
import java.awt.*;
import java.awt.image.*;
import java.util.Hashtable;

class Printit implements ImageConsumer {
    boolean done = false;

    Printit(ImageProducer source) {
        source.startProduction(this);
        while(true) {
            try Thread.currentThread().sleep(200); catch (Throwable e);
            if(this.done) break;
        }
    }

    public void setProperties(java.util.Hashtable dummy) {}
    public void setColorModel(ColorModel dummy) {}
    public void setHints(int dummy) {}
    public void imageComplete(int dummy) {done = true;}
    public void setDimensions(int w,int h) {
        System.out.println("w,h: "+w+" "+h);
    }
    public void setPixels(int x,int y,int w,int h,
        ColorModel model,byte pixels[],int off,int scansize) {
        boolean is_index = (model instanceof IndexColorModel);
        for(int j=0;j<h;j++) {
            int pp = off + scansize * j;
            for(int i=0;i<w;i++) {
                int pixel = pixels[pp++];
                int rgb = model.getRGB(pixel); // (1)
                System.out.println("byte "+(i+x)+" "+(j+y)+" "+Integer.toString(rgb,16));
            }
        }
    }
    public void setPixels(int x,int y,int w,int h,
        ColorModel model,int pixels[],int off,int scansize) {
        for(int j=0;j<h;j++) {
            int pp = off + scansize * j;
            for(int i=0;i<w;i++) {
                int pixel = pixels[pp++];
                int rgb = model.getRGB(pixel);
                System.out.println("int "+(i+x)+" "+(j+y)+" "+Integer.toString(rgb,16));
            }
        }
    }
}

public class Bug1 extends Canvas {
    public void paint(Graphics g) {
        Image image = createImage(5,5);
        Graphics ig = image.getGraphics();
        ig.setColor(Color.white);
        ig.fillRect(0,0,1000,1000);
        ImageConsumer c = new Printit(image.getSource());
    }

    public static void main(String args[]) {
        Frame f = new Frame("Test");
        Bug1 c = new Bug1();
        c.resize(256,256);
        f.add("Center",c);
        f.pack();
        f.show();
    }
}