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
26package 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
34public class XcbRequestCounter {
35    private static final 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}
60