test/jdk/java/awt/Checkbox/CheckboxCheckerScalingTest.java

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import java.awt.Checkbox;
import java.awt.Color;
import java.awt.EventQueue;
import java.awt.Frame;
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
 * @key headful
 * @bug 8233068
 * @summary Tests checkbox checker on scaling
 * @requires (os.family == "linux")
 * @run main CheckboxCheckerScalingTest
 */

public class CheckboxCheckerScalingTest {
    private static Frame frame;
    private static Checkbox checkbox;
    private static volatile Point point;
    private static boolean checkmarkFound = false;
    private static final int TOLERANCE = 5;
    private static final int COLOR_CHECK_THRESHOLD = 8;
    private static int colorCounter = 0;

    public static void main(String[] args) throws Exception {
        System.setProperty("sun.java2d.uiScale", "2");
        Robot robot = new Robot();

        try {
            EventQueue.invokeAndWait(() -> {
                frame = new Frame("CheckBox checker scaling test");
                checkbox = new Checkbox("one");
                checkbox.setState(true);
                frame.add(checkbox);
                frame.setLocationRelativeTo(null);
                frame.pack();
                frame.setVisible(true);
            });

            robot.waitForIdle();
            robot.delay(100);
            EventQueue.invokeAndWait(() -> point = checkbox.getLocationOnScreen());
            Rectangle rect = new Rectangle(point.x + 5, point.y + 7, 8, 8);
            BufferedImage imageAfterChecked = robot.createScreenCapture(rect);
            check:
            {
                for (int i = 0; i < imageAfterChecked.getHeight(); i++) {
                    for (int j = 0; j < imageAfterChecked.getWidth(); j++) {
                        Color pixelColor = new Color(imageAfterChecked.getRGB(i, j));
                        if (compareColor(pixelColor)) {
                            if (++colorCounter >= COLOR_CHECK_THRESHOLD) {
                                checkmarkFound = true;
                                break check;
                            }
                        }

                    }
                }
            }

            if (!checkmarkFound) {
                try {
                    ImageIO.write(imageAfterChecked, "png",
                            new File("imageAfterChecked.png"));
                } catch (IOException e) {
                    throw new RuntimeException(e);
                }
                throw new RuntimeException("Checkmark not scaled");
            }
            System.out.println("Test Passed");
        } finally {
            EventQueue.invokeAndWait(() -> {
                if (frame != null) {
                    frame.dispose();
                }
            });
        }
    }

    private static boolean compareColor(Color c) {
        return Math.abs(Color.black.getRed() - c.getRed()) < TOLERANCE &&
                Math.abs(Color.black.getGreen() - c.getGreen()) < TOLERANCE &&
                Math.abs(Color.black.getBlue() - c.getBlue()) < TOLERANCE;
    }
}