public static void main(String[] args) {
		final Display display = new Display ();
		final Image image = display.getSystemImage(SWT.ICON_INFORMATION);
		final Shell shell = new Shell (display, SWT.NO_TRIM);
		Region region = new Region();
		final ImageData imageData = image.getImageData();
		if (imageData.alphaData != null) {
			Rectangle pixel = new Rectangle(0, 0, 1, 1);
			for (int y = 0; y < imageData.height; y++) {
				for (int x = 0; x < imageData.width; x++) {
					if (imageData.getAlpha(x, y) == 255) {
						pixel.x = imageData.x + x;
						pixel.y = imageData.y + y;
						region.add(pixel);
					} 
				}
			}
		} else {
			ImageData mask = imageData.getTransparencyMask();
			Rectangle pixel = new Rectangle(0, 0, 1, 1);
			for (int y = 0; y < mask.height; y++) {
				for (int x = 0; x < mask.width; x++) {
					if (mask.getPixel(x, y) != 0) {
						pixel.x = imageData.x + x;
						pixel.y = imageData.y + y;
						region.add(pixel);
					}
				}
			}
		}
		shell.setRegion(region);

		Listener l = new Listener() {
			int startX, startY;
			@Override
			public void handleEvent(Event e)  {
				if (e.type == SWT.KeyDown && e.character == SWT.ESC) {
					shell.dispose();
				}
				if (e.type == SWT.MouseDown && e.button == 1) {
					startX = e.x;
					startY = e.y; 
				}
				if (e.type == SWT.MouseMove && (e.stateMask & SWT.BUTTON1) != 0) {
					Point p = shell.toDisplay(e.x, e.y);
					p.x -= startX;
					p.y -= startY;
					shell.setLocation(p);
				}
				if (e.type == SWT.Paint) {
					e.gc.drawImage(image, imageData.x, imageData.y);
				}
			}
		};
		shell.addListener(SWT.KeyDown, l);
		shell.addListener(SWT.MouseDown, l);
		shell.addListener(SWT.MouseMove, l);
		shell.addListener(SWT.Paint, l);

		shell.setSize(imageData.x + imageData.width, imageData.y + imageData.height);
		shell.open ();
		while (!shell.isDisposed ()) {
			if (!display.readAndDispatch ()) display.sleep ();
		}
		region.dispose();
		image.dispose ();
		display.dispose ();
	}