jdk/test/java/awt/Robot/HiDPIScreenCapture/HiDPIRobotScreenCaptureTest.java

/*
 * Copyright (c) 2015, Oracle and/or its affiliates. All rights reserved.
 * 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.
 *
 * Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA
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 * questions.
 */

import java.awt.BorderLayout;
import java.awt.Canvas;
import java.awt.Color;
import java.awt.Frame;
import java.awt.Graphics;
import java.awt.Panel;
import java.awt.Rectangle;
import java.awt.Robot;
import java.awt.image.BufferedImage;
import javax.swing.UIManager;

/* @test
 * @bug 8073320
 * @summary  Windows HiDPI support
 * @author Alexander Scherbatiy
 * @requires (os.family == "windows")
 * @run main/othervm -Dsun.java2d.win.uiScaleX=3 -Dsun.java2d.win.uiScaleY=2
 *                    HiDPIRobotScreenCaptureTest
 */
public class HiDPIRobotScreenCaptureTest {

    private static final Color[] COLORS = {
        Color.GREEN, Color.BLUE, Color.ORANGE, Color.RED};

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

        try {
            UIManager.setLookAndFeel(
                    "com.sun.java.swing.plaf.windows.WindowsLookAndFeel");
        } catch (Exception e) {
            return;
        }

        Frame frame = new Frame();
        frame.setBounds(40, 30, 400, 300);
        frame.setUndecorated(true);

        Panel panel = new Panel(new BorderLayout());
        Canvas canvas = new Canvas() {
            @Override
            public void paint(Graphics g) {
                super.paint(g);
                int w = getWidth();
                int h = getHeight();
                g.setColor(COLORS[0]);
                g.fillRect(0, 0, w / 2, h / 2);
                g.setColor(COLORS[1]);
                g.fillRect(w / 2, 0, w / 2, h / 2);
                g.setColor(COLORS[2]);
                g.fillRect(0, h / 2, w / 2, h / 2);
                g.setColor(COLORS[3]);
                g.fillRect(w / 2, h / 2, w / 2, h / 2);
            }
        };

        panel.add(canvas);
        frame.add(panel);
        frame.setVisible(true);
        Robot robot = new Robot();
        robot.waitForIdle();
        Thread.sleep(200);

        Rectangle rect = canvas.getBounds();
        rect.setLocation(canvas.getLocationOnScreen());

        BufferedImage image = robot.createScreenCapture(rect);
        frame.dispose();

        int w = image.getWidth();
        int h = image.getHeight();

        if (w != frame.getWidth() || h != frame.getHeight()) {
            throw new RuntimeException("Wrong image size!");
        }

        if (image.getRGB(w / 4, h / 4) != COLORS[0].getRGB()) {
            throw new RuntimeException("Wrong image color!");
        }

        if (image.getRGB(3 * w / 4, h / 4) != COLORS[1].getRGB()) {
            throw new RuntimeException("Wrong image color!");
        }

        if (image.getRGB(w / 4, 3 * h / 4) != COLORS[2].getRGB()) {
            throw new RuntimeException("Wrong image color!");
        }

        if (image.getRGB(3 * w / 4, 3 * h / 4) != COLORS[3].getRGB()) {
            throw new RuntimeException("Wrong image color!");
        }
    }
}