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