1 /*
2  * Copyright (c) 2013, 2019, 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  * @test
26  * @key headful
27  * @bug 8007146 8213119
28  * @summary [macosx] Setting a display mode crashes JDK under VNC
29  */
30 import java.awt.DisplayMode;
31 import java.awt.GraphicsDevice;
32 import java.awt.GraphicsEnvironment;
33 
34 public class CheckDisplayModes {
35 
main(String[] args)36     public static void main(String[] args) {
37         GraphicsEnvironment ge = GraphicsEnvironment.getLocalGraphicsEnvironment();
38         for (GraphicsDevice graphicDevice : ge.getScreenDevices()) {
39             if (!graphicDevice.isDisplayChangeSupported()) {
40                 System.err.println("Display mode change is not supported on this host. Test is considered passed.");
41                 continue;
42             }
43             DisplayMode defaultDisplayMode = graphicDevice.getDisplayMode();
44             checkDisplayMode(defaultDisplayMode);
45             graphicDevice.setDisplayMode(defaultDisplayMode);
46 
47             DisplayMode[] displayModes = graphicDevice.getDisplayModes();
48             boolean isDefaultDisplayModeIncluded = false;
49             for (DisplayMode displayMode : displayModes) {
50                 checkDisplayMode(displayMode);
51                 graphicDevice.setDisplayMode(displayMode);
52                 if (defaultDisplayMode.equals(displayMode)) {
53                     isDefaultDisplayModeIncluded = true;
54                 }
55             }
56 
57             if (!isDefaultDisplayModeIncluded) {
58                 throw new RuntimeException("Default display mode is not included");
59             }
60         }
61     }
62 
checkDisplayMode(DisplayMode displayMode)63     static void checkDisplayMode(DisplayMode displayMode) {
64         if (displayMode == null || displayMode.getWidth() <= 1 || displayMode.getHeight() <= 1) {
65             throw new RuntimeException("invalid display mode");
66         }
67     }
68 }
69