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/*
* Copyright (c) 2015, 2022, 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
* or visit www.oracle.com if you need additional information or have any
* 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.Point;
import java.awt.Rectangle;
import java.awt.Robot;
import java.awt.image.BufferedImage;
import javax.swing.UIManager;
import javax.imageio.ImageIO;
import java.io.File;
import java.io.IOException;
/**
* @test
* @key headful
* @bug 8073320 8280861
* @summary Linux and Windows HiDPI support
* @author Alexander Scherbatiy
* @requires (os.family == "linux" | os.family == "windows")
* @run main/othervm -Dsun.java2d.win.uiScaleX=3 -Dsun.java2d.win.uiScaleY=2
* HiDPIRobotScreenCaptureTest
* @run main/othervm -Dsun.java2d.uiScale=1 HiDPIRobotScreenCaptureTest
* @run main/othervm -Dsun.java2d.uiScale=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 {
if (System.getProperty("os.name").toLowerCase().contains("win")) {
try {
UIManager.setLookAndFeel(
"com.sun.java.swing.plaf.windows.WindowsLookAndFeel");
} catch (Exception e) {
return;
}
}
Frame frame = new Frame();
// Position the frame on prime number coordinates (mind OFFSET)
// to avoid them being multiple of the desktop scale; this tests Linux
// color picker better.
// Also, the position should be far enough from the top left
// corner of the screen to reduce the chance of being repositioned
// by the system because that area's occupied by the global
// menu bar and such.
frame.setBounds(78, 92, 100, 100);
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();
robot.delay(500);
Rectangle rect = canvas.getBounds();
rect.setLocation(canvas.getLocationOnScreen());
System.out.println("Creating screen capture of " + rect);
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!");
}
checkRectColor(image, new Rectangle(0, 0, w / 2, h / 2), COLORS[0]);
checkRectColor(image, new Rectangle(w / 2, 0, w / 2, h / 2), COLORS[1]);
checkRectColor(image, new Rectangle(0, h / 2, w / 2, h / 2), COLORS[2]);
checkRectColor(image, new Rectangle(w / 2, h / 2, w / 2, h / 2), COLORS[3]);
}
private static final int OFFSET = 5;
static void checkRectColor(BufferedImage image, Rectangle rect, Color expectedColor) {
System.out.println("Checking rectangle " + rect + " to have color " + expectedColor);
final Point[] pointsToCheck = new Point[] {
new Point(rect.x + OFFSET, rect.y + OFFSET), // top left corner
new Point(rect.x + rect.width - OFFSET, rect.y + OFFSET), // top right corner
new Point(rect.x + rect.width / 2, rect.y + rect.height / 2), // center
new Point(rect.x + OFFSET, rect.y + rect.height - OFFSET), // bottom left corner
new Point(rect.x + rect.width - OFFSET, rect.y + rect.height - OFFSET) // bottom right corner
};
for (final var point : pointsToCheck) {
System.out.print("Checking color at " + point + " to be equal to " + expectedColor);
final int actualColor = image.getRGB(point.x, point.y);
if (actualColor != expectedColor.getRGB()) {
System.out.println("... Mismatch: found " + new Color(actualColor) + " instead. Check image.png.");
try {
ImageIO.write(image, "png", new File("image.png"));
} catch(IOException e) {
System.out.println("failed to save image.png.");
e.printStackTrace();
}
throw new RuntimeException("Wrong image color!");
} else {
System.out.println("... OK");
}
}
}
}
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