import java.io.File;

import org.eclipse.swt.SWT;
import org.eclipse.swt.events.PaintEvent;
import org.eclipse.swt.events.PaintListener;
import org.eclipse.swt.graphics.GC;
import org.eclipse.swt.graphics.Image;
import org.eclipse.swt.graphics.ImageData;
import org.eclipse.swt.layout.FillLayout;
import org.eclipse.swt.widgets.Canvas;
import org.eclipse.swt.widgets.Display;
import org.eclipse.swt.widgets.Shell;

public class Test {

	protected Shell shell;
	private Canvas canvas;
	private Image imgInput;

	/**
	 * Launch the application.
	 * 
	 * @param args
	 */
	public static void main(String[] args) {
		try {
			Test window = new Test();
			window.open();
		} catch (Exception e) {
			e.printStackTrace();
		}
	}

	/**
	 * Open the window.
	 */
	public void open() {
		Display display = Display.getDefault();
		createContents();
		shell.open();
		shell.layout();
		while (!shell.isDisposed()) {
			if (!display.readAndDispatch()) {
				display.sleep();
			}
		}
	}

	/**
	 * Create contents of the window.
	 */
	protected void createContents() {
		shell = new Shell();
		shell.setSize(450, 300);
		shell.setText("SWT Application");
		shell.setLayout(new FillLayout());
		canvas = new Canvas(shell, SWT.NO_BACKGROUND);
		File input = new File("C:\\Users\\Simon\\Desktop\\atemschutz.png");

		imgInput = new Image(Display.getDefault(), input.getAbsolutePath());

		canvas.addPaintListener(new ImagePaintListener());

	}

	private class ImagePaintListener implements PaintListener {

		@Override
		public void paintControl(PaintEvent e) {
			// Calculate positions

			int width = e.width;
			int height = e.height;
			// Create the image to fill the canvas
			Image image = new Image(Display.getCurrent(), canvas.getBounds());

			// Set up the offscreen gc
			GC gcImage = new GC(image);
			// Draw the background
			gcImage.fillRectangle(image.getBounds());
			gcImage.setAntialias(SWT.ON);
			gcImage.setAdvanced(true);
			e.gc.setAntialias(SWT.ON);
			if (imgInput != null) {
				// Noch keine Daten >> Logo
				// 260x113
				float scale = 1.0f;
				ImageData data = imgInput.getImageData();
				if (width < data.width) {
					scale = width / (float) data.width;
				}
				if (height < data.height) {
					float tmpScale = height / (float) data.height;
					scale = scale < tmpScale ? scale : tmpScale;
				}
				if (scale > 0.0) {
					Image scaledImage = new Image(e.display, data.scaledTo(Math.round(data.width * scale), Math.round(data.height * scale)));
					int imgWidth = scaledImage.getImageData().width;
					int imgHeight = scaledImage.getImageData().height;
					// Bild in voller Größe
					gcImage.drawImage(scaledImage, width / 2 - imgWidth / 2, height / 2 - imgHeight / 2);
					scaledImage.dispose();
				}
			}

			// Draw the offscreen buffer to the screen
			e.gc.drawImage(image, 0, 0);

			// Clean up
			image.dispose();
			gcImage.dispose();
			e.gc.dispose();
		}
	}

}

gc.drawImage(Image image, int srcX, int srcY, int srcWidth, int srcHeight, int destX, int destY, int destWidth, int destHeight)