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 40 public static void main(String[] args) { 41 EventQueue.invokeLater(new Runnable() { 42 @Override 43 public void run() { 44 leak(); 45 } 46 }); 47 } 48 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 }