private static void paintImage(GC gc, Point size) {
    gc.setBackground(gc.getDevice().getSystemColor(SWT.COLOR_WIDGET_BACKGROUND));
    gc.fillRectangle(0, 0, size.x, size.y);

    gc.setBackground(gc.getDevice().getSystemColor(SWT.COLOR_LIST_SELECTION));
    gc.fillRoundRectangle(0, 0, size.x - 1, size.y - 1, 10, 10);

    gc.setBackground(gc.getDevice().getSystemColor(SWT.COLOR_WIDGET_BACKGROUND));
    gc.drawRoundRectangle(0, 0, size.x - 1, size.y - 1, 10, 10);
    gc.drawText(gc.getFont().getFontData()[0].toString(), 10, 10, true);
  }
 public static void main(String[] args) {
   final Display display = new Display();
   final Image image = new Image(display, 16, 16);
   GC gc = new GC(image);
   gc.setBackground(display.getSystemColor(SWT.COLOR_RED));
   gc.fillRectangle(image.getBounds());
   gc.dispose();
   final Shell shell = new Shell(display);
   shell.setText("Lazy Table");
   shell.setLayout(new FillLayout());
   final Table table = new Table(shell, SWT.BORDER | SWT.MULTI);
   table.setSize(200, 200);
   Thread thread =
       new Thread() {
         @Override
         public void run() {
           for (int i = 0; i < 20000; i++) {
             if (table.isDisposed()) return;
             final int[] index = new int[] {i};
             display.syncExec(
                 () -> {
                   if (table.isDisposed()) return;
                   TableItem item = new TableItem(table, SWT.NONE);
                   item.setText("Table Item " + index[0]);
                   item.setImage(image);
                 });
           }
         }
       };
   thread.start();
   shell.setSize(200, 200);
   shell.open();
   while (!shell.isDisposed()) {
     if (!display.readAndDispatch()) display.sleep();
   }
   image.dispose();
   display.dispose();
 }
  private static void paintImage2(GC gc, Point size, int f) {
    gc.setBackground(gc.getDevice().getSystemColor(SWT.COLOR_WIDGET_BACKGROUND));
    gc.fillRectangle(0, 0, size.x, size.y);

    // Scale line width, corner roundness, and font size.
    // Caveat: line width expands in all directions, so the origin also has to move.

    gc.setBackground(gc.getDevice().getSystemColor(SWT.COLOR_LIST_SELECTION));
    gc.fillRoundRectangle(f / 2, f / 2, size.x - f, size.y - f, 10 * f, 10 * f);

    gc.setBackground(gc.getDevice().getSystemColor(SWT.COLOR_WIDGET_BACKGROUND));
    gc.setLineWidth(f);
    gc.drawRoundRectangle(f / 2, f / 2, size.x - f, size.y - f, 10 * f, 10 * f);
    FontData fontData = gc.getFont().getFontData()[0];
    fontData.setHeight(fontData.getHeight() * f);
    Font font = new Font(gc.getDevice(), fontData);
    try {
      gc.setFont(font);
      gc.drawText(fontData.toString(), 10 * f, 10 * f, true);
    } finally {
      font.dispose();
    }
  }