1 /* 2 * Copyright (c) 2010, 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. Oracle designates this 8 * particular file as subject to the "Classpath" exception as provided 9 * by Oracle in the LICENSE file that accompanied this code. 10 * 11 * This code is distributed in the hope that it will be useful, but WITHOUT 12 * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or 13 * FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License 14 * version 2 for more details (a copy is included in the LICENSE file that 15 * accompanied this code). 16 * 17 * You should have received a copy of the GNU General Public License version 18 * 2 along with this work; if not, write to the Free Software Foundation, 19 * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA. 20 * 21 * Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA 22 * or visit www.oracle.com if you need additional information or have any 23 * questions. 24 */ 25 26 package sun.java2d.xr; 27 28 /** 29 * UInt32 "emulation", mimics the behaviour of xcb's request counter. 30 * In order to be compatible with xcb we have to wrap exactly when xcb would do. 31 * @author Clemens Eisserer 32 */ 33 34 public class XcbRequestCounter { 35 private final static long MAX_UINT = 4294967295L; 36 37 long value; 38 39 public XcbRequestCounter(long value) { 40 this.value = value; 41 } 42 43 public void setValue(long value) { 44 this.value = value; 45 } 46 47 public long getValue() { 48 return value; 49 } 50 51 public void add(long v) { 52 value += v; 53 54 /*Handle 32-bit unsigned int overflow*/ 55 if (value > MAX_UINT) { 56 value = 0; //-= MAX_UINT; //Shouldn't that be zero?!?! 57 } 58 } 59 }