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/*
* Copyright (c) 2000, 2025, 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.Dimension;
import java.awt.EventQueue;
import java.awt.Font;
import java.awt.Frame;
import java.awt.Graphics;
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
* @key headful
* @bug 8342098
* @summary Verify that the image captured from the screen using a Robot
* and the source image are same.
* @requires os.family == "mac"
* @run main/othervm ScreenCaptureRobotTest
*/
/*
* @test
* @key headful
* @bug 8342098
* @summary Verify that the image captured from the screen using a Robot
* and the source image are same.
* @requires os.family != "mac"
* @run main/othervm -Dsun.java2d.uiScale=1 ScreenCaptureRobotTest
*/
public class ScreenCaptureRobotTest {
private static final int IMAGE_WIDTH = 200;
private static final int IMAGE_HEIGHT = 100;
private static final int OFFSET = 10;
private static Frame frame;
private static Canvas canvas;
private static BufferedImage realImage;
private static volatile Point point;
public static void main(String[] args) throws Exception {
try {
EventQueue.invokeAndWait(ScreenCaptureRobotTest::initializeGUI);
doTest();
} finally {
EventQueue.invokeAndWait(ScreenCaptureRobotTest::disposeFrame);
}
}
private static void initializeGUI() {
frame = new Frame("ScreenCaptureRobotTest Frame");
realImage = GraphicsEnvironment.getLocalGraphicsEnvironment()
.getDefaultScreenDevice()
.getDefaultConfiguration()
.createCompatibleImage(IMAGE_WIDTH, IMAGE_HEIGHT);
Graphics g = realImage.createGraphics();
g.setColor(Color.YELLOW);
g.fillRect(0, 0, IMAGE_WIDTH, IMAGE_HEIGHT);
g.setColor(Color.RED);
g.setFont(new Font(Font.SANS_SERIF, Font.BOLD, 20));
g.drawString("Capture This", 10, 40);
g.dispose();
canvas = new ImageCanvas();
canvas.setBackground(Color.YELLOW);
canvas.setPreferredSize(new Dimension(IMAGE_WIDTH + (OFFSET * 2),
IMAGE_HEIGHT + (OFFSET * 2)));
frame.setLayout(new BorderLayout());
frame.add(canvas);
frame.pack();
frame.setLocationRelativeTo(null);
frame.setVisible(true);
}
private static void doTest() throws Exception {
Robot robot = new Robot();
robot.mouseMove(0, 0);
robot.waitForIdle();
robot.delay(500);
EventQueue.invokeAndWait(() -> point = canvas.getLocationOnScreen());
Rectangle rect = new Rectangle(point.x + OFFSET, point.y + OFFSET,
IMAGE_WIDTH, IMAGE_HEIGHT);
BufferedImage capturedImage = robot.createScreenCapture(rect);
if (!compareImages(capturedImage, realImage)) {
String errorMessage = "FAIL : Captured Image is different from "
+ "the real image";
saveImage(capturedImage, "CapturedImage.png");
saveImage(realImage, "RealImage.png");
throw new RuntimeException(errorMessage);
}
}
private static boolean compareImages(BufferedImage capturedImg,
BufferedImage realImg) {
int capturedPixel;
int realPixel;
int imgWidth = capturedImg.getWidth();
int imgHeight = capturedImg.getHeight();
if (imgWidth != IMAGE_WIDTH || imgHeight != IMAGE_HEIGHT) {
System.out.println("Captured and real images are different in size");
return false;
}
for (int i = 0; i < imgWidth; i++) {
for (int j = 0; j < imgHeight; j++) {
capturedPixel = capturedImg.getRGB(i, j);
realPixel = realImg.getRGB(i, j);
if (capturedPixel != realPixel) {
System.out.println("Captured pixel ("
+ Integer.toHexString(capturedPixel) + ") at "
+ "(" + i + ", " + j + ") is not equal to real pixel ("
+ Integer.toHexString(realPixel) + ")");
return false;
}
}
}
return true;
}
private static class ImageCanvas extends Canvas {
@Override
public void paint(Graphics g) {
g.drawImage(realImage, OFFSET, OFFSET, this);
}
}
private static void saveImage(BufferedImage image, String fileName) {
try {
ImageIO.write(image, "png", new File(fileName));
} catch (IOException ignored) {
System.err.println(ignored.getMessage());
}
}
private static void disposeFrame() {
if (frame != null) {
frame.dispose();
}
}
}
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