custom thumbnail servlet performance

laurentpicquet

Hello all

We're running TS671 SP1 and I have a custom servlet to upload an image and create a thumbnail of the uploaded file.

as part of the servlet class, there's a resizeImage function which times out (i'd say after 2 minutes) if the uploaded image is quite big.

The trouble is, when I run the same method on a local file, it runs fast enough (1.3 seconds on a 4Mb image).

Here's what I have isolated as being the offending code:

        int type = (image.getTransparency() == Transparency.OPAQUE) ? BufferedImage.TYPE_INT_RGB : BufferedImage.TYPE_INT_ARGB; // check if the image supports transparency
        BufferedImage resizedImage = image;
        int currentWidth=image.getWidth();
        int currentHeight=image.getHeight();
        do {
            if (currentWidth > (int)rectangleX) {currentWidth /= 2;if (currentWidth < rectangleX) {currentWidth = (int) rectangleX;}}
            if (currentHeight > (int)rectangleY) {currentHeight /= 2;if (currentHeight < rectangleY) {currentHeight = (int) rectangleY;}}
            System.out.println("currentWidth:" + currentWidth  + "; rectangleX:" + (int)rectangleX);
            System.out.println("currentHeight:" + currentHeight+ "; rectangleY:" + (int)rectangleY);
            //BufferedImage tmp = new BufferedImage(currentWidth, currentHeight, type);
            BufferedImage tmp = image.createGraphics().getDeviceConfiguration().createCompatibleImage(currentWidth, currentHeight, type);
            Graphics2D g2 = tmp.createGraphics();
/* -->*/            g2.setRenderingHint(RenderingHints.KEY_INTERPOLATION, RenderingHints.VALUE_INTERPOLATION_BILINEAR);
/* --> */            g2.setRenderingHint(RenderingHints.KEY_RENDERING, RenderingHints.VALUE_RENDER_QUALITY);
            g2.drawImage(resizedImage, 0, 0, currentWidth, currentHeight, null);
            g2.dispose();
            resizedImage = tmp;
        } while (currentWidth != (int)rectangleX || currentHeight != (int)rectangleY);

If I remove the rendering hints, it runs in a similar time as a servlet as it does when I execute it as a local class, but it's makes the thumbnail is somewhat pixelated. If I put them in, it runs like a dog...

Any idea what's causing this? Is it memory related? How can I make it faster whilst still retaining image quality?