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/*
* Copyright (c) 2022, 2023, Oracle and/or its affiliates. All rights reserved.
* Copyright (c) 2022, JetBrains s.r.o.. 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.imageio.ImageIO;
import java.io.File;
import java.io.IOException;
/**
* @test
* @key headful
* @bug 8280861
* @summary Verifies Robot screen capture capabilities with different
* Gtk backends and presence of UI scaling
* @requires os.family == "linux"
* @run main/othervm -Djdk.gtk.version=2 -Dsun.java2d.uiScale=1 ScreenCaptureGtkTest
* @run main/othervm -Djdk.gtk.version=3 -Dsun.java2d.uiScale=1 ScreenCaptureGtkTest
*/
public class ScreenCaptureGtkTest {
private static final Color[] COLORS = {
Color.GREEN, Color.BLUE, Color.ORANGE, Color.RED};
public static void main(String[] args) throws Exception {
if ("2".equals(System.getProperty("jdk.gtk.version"))
&& System.getenv("WAYLAND_DISPLAY") != null) {
// screen capture is not supported with gtk2 on Wayland
return;
}
final int topOffset = 50;
final int leftOffset = 50;
Frame frame = new Frame();
// Position the frame such that color picker will work with
// prime number coordinates (mind the 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(89, 99, 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, h);
// Paint several distinct pixels next to one another
// in order to test color picker's precision.
for (int i = 1; i < COLORS.length; i++) {
g.setColor(COLORS[i]);
g.fillRect(leftOffset + i, topOffset, 1, 1);
}
}
};
panel.add(canvas);
frame.add(panel);
frame.setVisible(true);
Robot robot = new Robot();
robot.waitForIdle();
robot.delay(500);
captureImageOf(frame, robot);
final Point screenLocation = frame.getLocationOnScreen();
try {
checkPixelColors(robot, screenLocation.x + leftOffset,
screenLocation.y + topOffset);
} finally {
robot.delay(100);
frame.dispose();
}
}
static void checkPixelColors(Robot robot, int x, int y) {
for (int i = 0; i < COLORS.length; i++) {
final Color actualColor = robot.getPixelColor(x + i, y);
System.out.print("Checking color at " + (x + i) + ", " + y + " to be equal to " + COLORS[i]);
if (!actualColor.equals(COLORS[i])) {
System.out.println("... Mismatch: found " + actualColor + " instead");
saveImage();
throw new RuntimeException("Wrong screen pixel color");
} else {
System.out.println("... OK");
}
}
}
private static BufferedImage image;
static void captureImageOf(Frame frame, Robot robot) {
Rectangle rect = frame.getBounds();
rect.setLocation(frame.getLocationOnScreen());
System.out.println("Creating screen capture of " + rect);
image = robot.createScreenCapture(rect);
}
static void saveImage() {
System.out.println("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();
}
}
}
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