jdk/test/javax/swing/JFrame/8175301/ScaledFrameBackgroundTest.java

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 * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
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 * 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
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 *
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 * 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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import java.awt.Color;
import java.awt.Rectangle;
import java.awt.Robot;
import javax.swing.JFrame;
import javax.swing.JPanel;
import javax.swing.SwingUtilities;

/**
 * @test
 * @bug 8175301
 * @summary Java GUI hangs on Windows when Display set to 125%
 * @run main/othervm -Dsun.java2d.uiScale=2 ScaledFrameBackgroundTest
 * @run main/othervm -Dsun.java2d.uiScale=2 -Dsun.java2d.d3d=true ScaledFrameBackgroundTest
 * @run main/othervm -Dsun.java2d.uiScale=2 -Dsun.java2d.opengl=true ScaledFrameBackgroundTest
 */
public class ScaledFrameBackgroundTest {

    private static final Color BACKGROUND = Color.RED;
    private static JFrame frame;

    public static void main(String[] args) throws Exception {

        Robot robot = new Robot();
        robot.setAutoDelay(50);

        SwingUtilities.invokeAndWait(() -> {
            frame = new JFrame();
            frame.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
            frame.setSize(400, 300);
            JPanel panel = new JPanel();
            panel.setBackground(BACKGROUND);
            frame.getContentPane().add(panel);
            frame.setVisible(true);
        });

        robot.waitForIdle();
        Thread.sleep(200);

        Rectangle[] rects = new Rectangle[1];
        SwingUtilities.invokeAndWait(() -> {
            rects[0] = frame.getBounds();
        });

        Rectangle bounds = rects[0];

        int x = bounds.x + bounds.width / 4;
        int y = bounds.y + bounds.height / 4;

        Color color = robot.getPixelColor(x, y);

        if (!BACKGROUND.equals(color)) {
            throw new RuntimeException("Wrong backgound color!");
        }

        x = bounds.x + 3 * bounds.width / 4;
        y = bounds.y + 3 * bounds.height / 4;

        color = robot.getPixelColor(x, y);

        if (!BACKGROUND.equals(color)) {
            throw new RuntimeException("Wrong backgound color!");
        }
    }
}