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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.
*/
/*
* @test
* @bug 4216180
* @summary This test verifies that Graphics2D.setBackground and clearRect
* performs correctly regardless of antialiasing hint.
* @key headful
* @run main NativeWin32Clear
*/
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.Graphics2D;
import java.awt.Insets;
import java.awt.Point;
import java.awt.Rectangle;
import java.awt.RenderingHints;
import java.awt.Robot;
import java.awt.image.BufferedImage;
import java.lang.reflect.InvocationTargetException;
public class NativeWin32Clear extends Frame {
public void initialize() {
setLocationRelativeTo(null);
setSize(300, 200);
setBackground(Color.red);
setVisible(true);
}
public void paint(Graphics g) {
Graphics2D g2 = (Graphics2D) g;
Dimension d = getSize();
g2.setBackground(Color.green);
g2.setRenderingHint(RenderingHints.KEY_ANTIALIASING,
RenderingHints.VALUE_ANTIALIAS_ON);
g2.clearRect(0, 0, d.width / 2, d.height);
g2.setRenderingHint(RenderingHints.KEY_ANTIALIASING,
RenderingHints.VALUE_ANTIALIAS_OFF);
g2.clearRect(d.width / 2, 0, d.width / 2, d.height);
g2.setColor(Color.black);
}
public void cleanup() {
setVisible(false);
dispose();
}
public void requestCoordinates(Rectangle r) {
Insets insets = getInsets();
Point location = getLocationOnScreen();
Dimension size = getSize();
r.x = location.x + insets.left + 5;
r.y = location.y + insets.top + 5;
r.width = size.width - (insets.left + insets.right + 10);
r.height = size.height - (insets.top + insets.bottom + 10);
}
/*
* Check color match within allowed deviation.
* Prints first non-matching pixel coordinates and actual and expected values.
* Returns true if image is filled with the provided color, false otherwise.
*/
private boolean checkColor(BufferedImage img, Color c, int delta) {
int cRed = c.getRed();
int cGreen = c.getGreen();
int cBlue = c.getBlue();
for (int y = 0; y < img.getHeight(); y++) {
for (int x = 0; x < img.getWidth(); x++) {
int rgb = img.getRGB(x, y);
int red = (rgb & 0x00ff0000) >> 16;
int green = (rgb & 0x0000ff00) >> 8;
int blue = rgb & 0x000000ff;
if (cRed > (red + delta) || cRed < (red - delta)
|| cGreen > (green + delta) || cGreen < (green - delta)
|| cBlue > (blue + delta) || cBlue < (blue - delta)) {
System.err.println("Color at coordinates (" + x + ", " + y + ") does not match");
System.err.println("Expected color: " + c.getRGB());
System.err.println("Actual color: " + rgb);
System.err.println("Allowed deviation: " + delta);
return false;
}
}
}
return true;
}
public static void main(String[] args) throws InterruptedException,
InvocationTargetException, AWTException {
NativeWin32Clear test = new NativeWin32Clear();
try {
EventQueue.invokeAndWait(test::initialize);
Robot robot = new Robot();
Rectangle coords = new Rectangle();
EventQueue.invokeAndWait(() -> {
test.requestCoordinates(coords);
});
robot.delay(2000);
robot.mouseMove(coords.x - 50, coords.y - 50);
robot.waitForIdle();
BufferedImage capture = robot.createScreenCapture(coords);
robot.delay(2000);
if (!test.checkColor(capture, Color.green, 5)) {
throw new RuntimeException("Incorrect color encountered, check error log for details");
}
} finally {
EventQueue.invokeAndWait(test::cleanup);
}
}
}
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