image manipulation

[Dieter Merlin]

Hi,

I have some code to create thumbnails of pictures anddisplay them on a site.
The problem is that we run into an outofmemoryerror every 2 weeks or so. (heap size = 512mb)

The average picture size is +- 1 MB

Here is the current code;

    
public static Image getImage(byte[] u) {
    return new ImageIcon(u).getImage();
}
 
public static byte[] processImage(final byte[] u, int maxWidth, int maxHeight, Render render, String text)
            throws IOException {
        final Image photo = getImage(u);
 
        // ImageObserver is ingnored for BufferedImages
        final int photoWidth = photo.getWidth(null);
        final int photoHeight = photo.getHeight(null);
 
        int thumbWidth = maxWidth;
        int thumbHeight = maxHeight;
        double photoRatio = 0.0;
        
        if (photoWidth > photoHeight) {
        photoRatio = (double) photoWidth / (double) photoHeight;
        thumbHeight = maxHeight;
        thumbWidth = (int) (maxHeight * photoRatio);
    }
 
    if (photoHeight > photoWidth) { // portrait
    photoRatio = (double) photoHeight / (double) photoWidth;
    thumbWidth = maxWidth;
    thumbHeight = (int) (maxWidth * photoRatio);
    }
 
    BufferedImage thumbnail = new BufferedImage(thumbWidth, thumbHeight,
                BufferedImage.TYPE_INT_RGB);
        final Graphics2D graphics2D = thumbnail.createGraphics();
 
        render.setRenderingHints(graphics2D);
        final AffineTransform t = AffineTransform.getScaleInstance((double) thumbWidth / photoWidth, (double) thumbHeight / photoHeight);
 
        graphics2D.drawImage(photo, t, null);
        
        if (text != null) {
            graphics2D.setFont(f);
            FontRenderContext frc = graphics2D.getFontRenderContext();
            Rectangle2D bounds = f.getStringBounds(text, frc);
            int textX = (thumbWidth - ((int)bounds.getWidth()))/2;
            int textY = (thumbHeight - ((int)(1.5*bounds.getHeight())));
            graphics2D.setColor(Color.BLACK);
            graphics2D.drawString(text, textX-1, textY+1);
            graphics2D.setColor(BG);
            graphics2D.drawString(text, textX, textY);
        }
        
        graphics2D.dispose();
        ByteArrayOutputStream baos = new ByteArrayOutputStream();
        ImageIO.write(thumbnail, "jpeg", baos);
        return baos.toByteArray();
    }

I know that the ImageIcon(byte[] data).getImage() holds a reference to the data but using Toolkit.createImage fails to work (black image)
and using ImageIO.read() doesnt help with the OOM either.

Avoiding the BAOS and writing the thumb directly to the ServletOutputStream causes 100% cpu usage and prevents the picture to be loaded.

I'm a little desperate on this since I cant find anything usefull that would help.

Thanks in advance

[Bear Bibeault]

As the servlet API has no means of image manipulation, this has been moved to the AWT forum.

[Dieter Merlin]

sorry, its just because we do it from a servlet in a jboss container that I thought it should be there, that it could have a meaning to it