Name: yyT116575 Date: 10/16/2001


java version "1.3.0"
Java(TM) 2 Runtime Environment, Standard Edition (build 1.3.0-C)
Java HotSpot(TM) Client VM (build 1.3.0-C, mixed mode)

The incremental display of images does not work in JDK 1.2 and later.

The following is the code for a component that displays an image:

    class ImageViewer extends Panel {
      private Image image;

      public ImageViewer( Image image ) {
        this.image = image;
      }

      public void paint( Graphics g ) {
        Dimension size = getSize();
        g.drawImage( image, 0, 0, size.width, size.height, this );
      }
    }

I have tested this in both an application and an applet and I get the
same results. It works with JDK 1.1.*, but not with 1.2.* or 1.3.*. I
have also tried this with Swing components and see the same behavior.

All of the ImageObserver mechanisms work properly. The component's
imageUpdate() method is called multiple times as the image is loaded.
The default implementation of imageUpdate() does a repaint(), and the
component's paint() method is called.

But when the paint() method calls Graphics.drawImage() on the partially loaded
image, it draws nothing (with JDK 1.2 and JDK 1.3), even though the docs say
that it "Draws as much of the specified image as is currently available".

An examination of the source for sun.awt.image.ImageRepresentation appears to
confirm that the actual rendering call, involving a BufferedImage, is not made
until ALLBITS are received. Hence the implementation is in direct confict with
the documented behavior and the behavior of previous releases.
(Review ID: 133468)
======================================================================