Java example source code file (SharedMemoryPixmapsTest.java)

This example Java source code file (SharedMemoryPixmapsTest.java) is included in the alvinalexander.com "Java Source Code Warehouse" project. The intent of this project is to help you "Learn Java by Example" ^TM.

Learn more about this Java project at its project page.

Java - Java tags/keywords

awt, bufferedimage, can\'t, dimension, frame, graphics, image, image_size, interruptedexception, override, rectangle, robot, runtimeexception, sharedmemorypixmapstest, string, testcomponent

The SharedMemoryPixmapsTest.java Java example source code

/*
 * Copyright (c) 2005, 2012, 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.AWTException;
import java.awt.Color;
import java.awt.Component;
import java.awt.Dimension;
import java.awt.Frame;
import java.awt.Graphics;
import java.awt.Point;
import java.awt.Rectangle;
import java.awt.Robot;
import java.awt.Toolkit;
import java.awt.image.BufferedImage;
import java.awt.image.VolatileImage;

/*
 *
 *
 * Tests that the use of shared memory pixmaps isn't broken:
 * create a VolatileImage, fill it with red color, copy it to the screen
 * make sure the pixels on the screen are red.
 *
 * Note that we force the use of shared memory pixmaps in the shell script.
 *
 * @author Dmitri.Trembovetski
 */

public class SharedMemoryPixmapsTest {
    static final int IMAGE_SIZE = 100;
    static boolean show = false;
    final Frame testFrame;
    /** Creates a new instance of SharedMemoryPixmapsTest */
    public SharedMemoryPixmapsTest() {
        testFrame = new Frame("SharedMemoryPixmapsTest");
        testFrame.add(new TestComponent());
        testFrame.setUndecorated(true);
        testFrame.setResizable(false);
        testFrame.pack();
        testFrame.setLocationRelativeTo(null);
        testFrame.setVisible(true);
        testFrame.toFront();
    }

    public static void main(String[] args) {
        for (String s : args) {
            if ("-show".equals(s)) {
                show = true;
            } else {
                System.err.println("Usage: SharedMemoryPixmapsTest [-show]");
            }
        }
        new SharedMemoryPixmapsTest();
    }

    private class TestComponent extends Component {
        VolatileImage vi = null;
        boolean tested = false;

        void initVI() {
            int res;
            if (vi == null) {
                res = VolatileImage.IMAGE_INCOMPATIBLE;
            } else {
                res = vi.validate(getGraphicsConfiguration());
            }
            if (res == VolatileImage.IMAGE_INCOMPATIBLE) {
                if (vi != null) vi.flush();
                vi = createVolatileImage(IMAGE_SIZE, IMAGE_SIZE);
                vi.validate(getGraphicsConfiguration());
                res = VolatileImage.IMAGE_RESTORED;
            }
            if (res == VolatileImage.IMAGE_RESTORED) {
                Graphics vig = vi.getGraphics();
                vig.setColor(Color.red);
                vig.fillRect(0, 0, vi.getWidth(), vi.getHeight());
                vig.dispose();
            }
        }

        @Override
        public synchronized void paint(Graphics g) {
            do {
                g.setColor(Color.green);
                g.fillRect(0, 0, getWidth(), getHeight());

                initVI();
                g.drawImage(vi, 0, 0, null);
            } while (vi.contentsLost());

            Toolkit.getDefaultToolkit().sync();
            if (!tested) {
                if (testRendering()) {
                    System.err.println("Test Passed");
                } else {
                    System.err.println("Test Failed");
                }
                tested = true;
            }
            if (!show) {
                testFrame.setVisible(false);
                testFrame.dispose();
            }
        }

        private boolean testRendering() throws RuntimeException {
            try {
                Thread.sleep(2000);
            } catch (InterruptedException ex) {}
            Robot r = null;
            try {
                r = new Robot();
            } catch (AWTException ex) {
                ex.printStackTrace();
                throw new RuntimeException("Can't create Robot");
            }
            Point p = getLocationOnScreen();
            BufferedImage b =
                r.createScreenCapture(new Rectangle(p, getPreferredSize()));
            for (int y = 0; y < b.getHeight(); y++) {
                for (int x = 0; x < b.getWidth(); x++) {
                    if (b.getRGB(x, y) != Color.red.getRGB()) {
                        System.err.println("Incorrect pixel" + " at "
                            + x + "x" + y + " : " +
                            Integer.toHexString(b.getRGB(x, y)));
                        if (show) {
                            return false;
                        }
                        System.err.println("Test Failed");
                        System.exit(1);
                    }
                }
            }
            return true;
        }

        @Override
        public Dimension getPreferredSize() {
            return new Dimension(IMAGE_SIZE, IMAGE_SIZE);
        }
    }

}