test/java/awt/GraphicsDevice/CheckDisplayModes.java

/*
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 * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
 *
 * This code is free software; you can redistribute it and/or modify it
 * under the terms of the GNU General Public License version 2 only, as
 * published by the Free Software Foundation.
 *
 * This code is distributed in the hope that it will be useful, but WITHOUT
 * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
 * FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License
 * version 2 for more details (a copy is included in the LICENSE file that
 * accompanied this code).
 *
 * You should have received a copy of the GNU General Public License version
 * 2 along with this work; if not, write to the Free Software Foundation,
 * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.
 *
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 * questions.
 */

/*
 * @test
 * @bug 8007146
 * @summary [macosx] Setting a display mode crashes JDK under VNC
 * @author Alexander Scherbatiy
 * @run main CheckDisplayModes
 */
import java.awt.DisplayMode;
import java.awt.GraphicsDevice;
import java.awt.GraphicsEnvironment;

public class CheckDisplayModes {

    public static void main(String[] args) {
        GraphicsEnvironment ge = GraphicsEnvironment.getLocalGraphicsEnvironment();
        GraphicsDevice graphicDevice = ge.getDefaultScreenDevice();
        if (!graphicDevice.isDisplayChangeSupported()) {
            System.err.println("Display mode change is not supported on this host. Test is considered passed.");
            return;
        }
        DisplayMode defaultDisplayMode = graphicDevice.getDisplayMode();
        checkDisplayMode(defaultDisplayMode);
        graphicDevice.setDisplayMode(defaultDisplayMode);

        DisplayMode[] displayModes = graphicDevice.getDisplayModes();
        boolean isDefaultDisplayModeIncluded = false;
        for (DisplayMode displayMode : displayModes) {
            checkDisplayMode(displayMode);
            graphicDevice.setDisplayMode(displayMode);
            if (defaultDisplayMode.equals(displayMode)) {
                isDefaultDisplayModeIncluded = true;
            }
        }

        if (!isDefaultDisplayModeIncluded) {
            throw new RuntimeException("Default display mode is not included");
        }
    }

    static void checkDisplayMode(DisplayMode displayMode) {
        if (displayMode == null || displayMode.getWidth() <= 1 || displayMode.getHeight() <= 1) {
            throw new RuntimeException("invalid display mode");
        }
    }
}