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 * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
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 * 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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import java.awt.Color;
import java.awt.Dimension;
import java.awt.EventQueue;
import java.awt.Frame;
import java.awt.GraphicsConfiguration;
import java.awt.GraphicsEnvironment;
import java.awt.Point;
import java.awt.Rectangle;
import java.awt.Robot;
import java.awt.image.BufferedImage;
import java.io.File;
import java.io.IOException;
import javax.imageio.ImageIO;

/*
 * @test
 * @bug 4328588
 * @key headful
 * @summary Non-default visual on top-level Frame should work
 * @run main FrameVisualTest
 */

public class FrameVisualTest {
    private static GraphicsConfiguration[] gcs;
    private static volatile Frame[] frames;
    private static volatile int index;

    private static Frame f;
    private static Robot robot;
    private static volatile Point p;
    private static volatile Dimension d;
    private static final int TOLERANCE = 5;

    public static void main(String[] args) throws Exception {
        gcs = GraphicsEnvironment.getLocalGraphicsEnvironment().getDefaultScreenDevice().getConfigurations();
        robot = new Robot();
        robot.setAutoDelay(100);
        try {
            EventQueue.invokeAndWait(() -> {
                createAndShowUI();
            });
            robot.delay(1000);
            System.out.println("frames.length: "+frames.length);
            for (index = 0; index < frames.length; index++) {
                EventQueue.invokeAndWait(() -> {
                    p = frames[index].getLocation();
                    d = frames[index].getSize();
                });
                Rectangle rect = new Rectangle(p, d);
                BufferedImage img = robot.createScreenCapture(rect);
                if (chkImgBackgroundColor(img)) {
                    try {
                        ImageIO.write(img, "png", new File("Frame_" + index + ".png"));
                    } catch (IOException ignored) {}
                    throw new RuntimeException("Frame visual test failed with non-white background color");
                }
            }
        } finally {
            for (index = 0; index < frames.length; index++) {
                EventQueue.invokeAndWait(() -> {
                    if (frames[index] != null) {
                        frames[index].dispose();
                    }
                });
            }
        }
    }

    private static void createAndShowUI() {
        frames = new Frame[gcs.length];
        for (int i = 0; i < frames.length; i++) {
            frames[i] = new Frame("Frame w/ gc " + i, gcs[i]);
            frames[i].setSize(100, 100);
            frames[i].setUndecorated(true);
            frames[i].setBackground(Color.WHITE);
            frames[i].setVisible(true);
        }
    }

    private static boolean chkImgBackgroundColor(BufferedImage img) {

        // scan for mid-line and if it is non-white color then return true.
        for (int x = 1; x < img.getWidth() - 1; ++x) {
            Color c = new Color(img.getRGB(x, img.getHeight() / 2));
            if ((c.getRed() - Color.WHITE.getRed()) > TOLERANCE &&
                    (c.getGreen() - Color.WHITE.getGreen()) > TOLERANCE &&
                    (c.getBlue() - Color.WHITE.getBlue()) > TOLERANCE) {
                return true;
            }
        }
        return false;
    }
}