Name: gsC80088 Date: 02/23/99


The Graphics2D.drawImage() does not draw one
BufferedImage.TYPE_BYTE_INDEXED image into another. It just
fills an area on the destination image with the background
color of the source image. If the
images used are BufferedImage.TYPE_INT_RGB then drawImage()
works correctly. The images have the same ColorModel.
This seriously impacts our program, as we will be forced to
use true-color images, which take up much more memory and
disk space, if there is not a fix to this. I have only tried
this on NT.

Here is a program that will show the problem:
<CODE>
<PRE>
import java.awt.*;
import java.awt.image.*;

public class ImageTest
{
private static final int IMAGE_TYPE = BufferedImage.TYPE_BYTE_INDEXED;
public static void main(String argv[])
{
//Inner Image
BufferedImage ii = new BufferedImage(100, 100, IMAGE_TYPE);
//Outer Image
BufferedImage oi = new BufferedImage(100, 100, IMAGE_TYPE);
//Inner Graphics
Graphics iig = ii.getGraphics();
//Outer Graphics
Graphics oig = oi.getGraphics();

//Draw something on the inner image
iig.drawLine(0, 0, 100, 100);
iig.setColor(Color.blue);
iig.drawRect(0, 0, 50, 50);
//Draw the inner image onto the outer image.
oig.drawImage(ii, 0, 0, null);
//Do it again, just to show it doesn't work.
oig.drawImage(ii, 0, 0, null);

Frame f = new Frame();
f.setTitle("Outer Image");
f.setSize(200, 200);
f.add(new ImageCanvas(oi));
f.show();

f = new Frame();
f.setTitle("Inner Image");
f.setSize(200, 200);
f.add(new ImageCanvas(ii));
f.show();
} // main()
} // class ImageTest

/**
 * Shows an image.
 */
class ImageCanvas extends Canvas
{
private Image m_i = null;

public ImageCanvas(Image i)
{
m_i = i;
}

public void paint(Graphics g)
{
g.drawImage(m_i, 0, 0, null);
}
} // class ImageCanvas
</PRE>
</CODE>
(Review ID: 54622)
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