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/*
* Copyright (c) 1999, 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 javax.imageio.ImageIO;
import java.awt.AWTException;
import java.awt.Color;
import java.awt.Dimension;
import java.awt.EventQueue;
import java.awt.Frame;
import java.awt.Graphics;
import java.awt.Insets;
import java.awt.Label;
import java.awt.Panel;
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 java.lang.reflect.InvocationTargetException;
/*
* @test
* @bug 4191297
* @summary Tests that unreferenced GDI resources are correctly
* destroyed when no longer needed.
* @key headful
* @run main GDIResourceExhaustionTest
*/
public class GDIResourceExhaustionTest extends Frame {
public void initUI() {
setSize(200, 200);
setUndecorated(true);
setLocationRelativeTo(null);
Panel labelPanel = new Panel();
Label label = new Label("Red label");
label.setBackground(Color.red);
labelPanel.add(label);
labelPanel.setLocation(20, 50);
add(labelPanel);
setVisible(true);
}
public void paint(Graphics graphics) {
super.paint(graphics);
for (int rgb = 0; rgb <= 0xfff; rgb++) {
graphics.setColor(new Color(rgb));
graphics.fillRect(0, 0, 5, 5);
}
}
public void requestCoordinates(Rectangle r) {
Insets insets = getInsets();
Point location = getLocationOnScreen();
Dimension size = getSize();
r.x = location.x + insets.left;
r.y = location.y + insets.top;
r.width = size.width - (insets.left + insets.right);
r.height = size.height - (insets.top + insets.bottom);
}
public static void main(String[] args) throws InterruptedException,
InvocationTargetException, AWTException, IOException {
GDIResourceExhaustionTest test = new GDIResourceExhaustionTest();
try {
EventQueue.invokeAndWait(test::initUI);
Robot robot = new Robot();
robot.delay(2000);
Rectangle coords = new Rectangle();
EventQueue.invokeAndWait(() -> {
test.requestCoordinates(coords);
});
robot.mouseMove(coords.x - 50, coords.y - 50);
robot.waitForIdle();
robot.delay(5000);
BufferedImage capture = robot.createScreenCapture(coords);
robot.delay(500);
boolean redFound = false;
int redRGB = Color.red.getRGB();
for (int y = 0; y < capture.getHeight(); y++) {
for (int x = 0; x < capture.getWidth(); x++) {
if (capture.getRGB(x, y) == redRGB) {
redFound = true;
break;
}
if (redFound) {
break;
}
}
}
if (!redFound) {
File errorImage = new File("screenshot.png");
ImageIO.write(capture, "png", errorImage);
throw new RuntimeException("Red label is not detected, possibly GDI resources exhausted");
}
} finally {
EventQueue.invokeAndWait(test::dispose);
}
}
}
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