Clip Circle from rectangle

private Bitmap getCircleImageBitmap() {

        Display display = getWindow().getWindowManager().getDefaultDisplay();
        Bitmap output = Bitmap.createBitmap(display.getWidth(), display.getHeight(), Config.ARGB_8888);
        Canvas canvas = new Canvas(output);

        final int color = 0x99000000;
        final Paint paint = new Paint();
        final Rect rect = new Rect(0, 0, display.getWidth(), display.getHeight());

        paint.setAntiAlias(true);
        canvas.drawARGB(0, 0, 0, 0);
        paint.setColor(color);
        paint.setStyle(Style.FILL);
        canvas.drawCircle(display.getWidth() / 2, display.getHeight() / 2, (display.getWidth() / 2) - 30, paint);
        paint.setXfermode(new PorterDuffXfermode(Mode.SRC_OUT));
        canvas.drawBitmap(bitmapimg, rect, rect, paint);
        return output;
    }