1 /*
2  * Copyright (c) 2013, Oracle and/or its affiliates. All rights reserved.
3  * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
4  *
5  * This code is free software; you can redistribute it and/or modify it
6  * under the terms of the GNU General Public License version 2 only, as
7  * published by the Free Software Foundation.
8  *
9  * This code is distributed in the hope that it will be useful, but WITHOUT
10  * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
11  * FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License
12  * version 2 for more details (a copy is included in the LICENSE file that
13  * accompanied this code).
14  *
15  * You should have received a copy of the GNU General Public License version
16  * 2 along with this work; if not, write to the Free Software Foundation,
17  * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.
18  *
19  * Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA
20  * or visit www.oracle.com if you need additional information or have any
21  * questions.
22  */
23 
24 /**
25  * @bug 8015334
26  * @summary Memory leak with kerning.
27  */
28 
29 import java.awt.EventQueue;
30 import java.awt.Font;
31 import java.awt.FontMetrics;
32 import java.awt.font.TextAttribute;
33 import java.util.HashMap;
34 import java.util.Map;
35 import javax.swing.JLabel;
36 import javax.swing.SwingUtilities;
37 
38 public class KerningLeak {
39 
main(String[] args)40     public static void main(String[] args) {
41         EventQueue.invokeLater(new Runnable() {
42             @Override
43             public void run() {
44                 leak();
45             }
46         });
47     }
48 
leak()49     private static void leak() {
50         Map<TextAttribute, Object> textAttributes = new HashMap<>();
51         textAttributes.put(TextAttribute.FAMILY, "Sans Serif");
52         textAttributes.put(TextAttribute.SIZE, 12);
53         textAttributes.put(TextAttribute.KERNING, TextAttribute.KERNING_ON);
54         Font font = Font.getFont(textAttributes);
55         JLabel label = new JLabel();
56         int dummy = 0;
57         for (int i = 0; i < 500; i++) {
58             if (i % 10 == 0) System.out.println("Starting iter " + (i+1));
59             for (int j = 0; j <1000; j++) {
60                 FontMetrics fm = label.getFontMetrics(font);
61                 dummy += SwingUtilities.computeStringWidth(fm, Integer.toString(j));
62             }
63         }
64         System.out.println("done " + dummy);
65     }
66 }
67