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Escher is a collection of libraries for X Window System written purely in Java.
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package gnu.x11.test;

import gnu.x11.GC;
import gnu.x11.Pixmap;
import gnu.x11.image.XBM;


/**
 * Test Nonrectangular Window Extension. 
 *
 * @see 
 * screenshot
 * 
 * @see 
 * text output
 *
 * @see 
 * help output
 */
public class Shape extends Graphics {
  public static final int [] xbm_data = {
    0xff, 0x00, 0x00, 0xc0, 0xfe, 0x01, 0x00, 0xc0, 0xfc, 0x03, 0x00, 0x60,
    0xf8, 0x07, 0x00, 0x30, 0xf8, 0x07, 0x00, 0x18, 0xf0, 0x0f, 0x00, 0x0c,
    0xe0, 0x1f, 0x00, 0x06, 0xc0, 0x3f, 0x00, 0x06, 0xc0, 0x3f, 0x00, 0x03,
    0x80, 0x7f, 0x80, 0x01, 0x00, 0xff, 0xc0, 0x00, 0x00, 0xfe, 0x61, 0x00,
    0x00, 0xfe, 0x31, 0x00, 0x00, 0xfc, 0x33, 0x00, 0x00, 0xf8, 0x1b, 0x00,
    0x00, 0xf0, 0x0d, 0x00, 0x00, 0xf0, 0x0e, 0x00, 0x00, 0x60, 0x1f, 0x00,
    0x00, 0xb0, 0x3f, 0x00, 0x00, 0x98, 0x7f, 0x00, 0x00, 0x98, 0x7f, 0x00,
    0x00, 0x0c, 0xff, 0x00, 0x00, 0x06, 0xfe, 0x01, 0x00, 0x03, 0xfc, 0x03,
    0x80, 0x01, 0xfc, 0x03, 0xc0, 0x00, 0xf8, 0x07, 0xc0, 0x00, 0xf0, 0x0f,
    0x60, 0x00, 0xe0, 0x1f, 0x30, 0x00, 0xe0, 0x1f, 0x18, 0x00, 0xc0, 0x3f,
    0x0c, 0x00, 0x80, 0x7f, 0x06, 0x00, 0x00, 0xff
  };


  public Shape (String [] args) throws gnu.x11.extension.NotFoundException {
    super (args, 32, 32); 

    about ("0.1", "test nonrectangular window extension",
      "Stephen Tse ",
      "http://escher.sourceforge.net/");

    if (help_option) return;

    Pixmap mask = new Pixmap (window, 32, 32, 1);
    XBM xbm = new XBM (display, 32, 32, xbm_data);
    
    GC.Values gv = new GC.Values ();
    gv.set_background (display.default_white);
    gv.set_foreground (display.default_black);
    GC gc = new GC (mask, gv);

    mask.put_image (gc, xbm, 0, 0);


    gnu.x11.extension.Shape shape = new gnu.x11.extension.Shape (display);

    // test extension opcode string in error 
    try {
      shape.combine_mask (window, -1, 0, 0, mask, -1);
      display.check_error (); 

    } catch (Error e) {
      System.out.println ("Forced error for testing: " + e);
    }      

    // force a round trip after an error is generated
    display.input.input_focus ();

    // test extension event mechanism
    shape.select_input (window, true);

    shape.combine_mask (window, gnu.x11.extension.Shape.BOUNDING, 0, 0, 
      mask, gnu.x11.extension.Shape.SUBTRACT);
  }


  public void dispatch_event () {
    super.dispatch_event ();
    if (event instanceof gnu.x11.extension.Shape.NotifyEvent) {
      gnu.x11.extension.Shape.NotifyEvent ne = 
        (gnu.x11.extension.Shape.NotifyEvent) event;
      System.out.println ("shape notify: " + ne.rectangle ());
    }
  }


  public static void main (String [] args) throws Exception { 
    new Shape (args).exec ();
  }
}