1 /*
   2  * Copyright (c) 2018, 2020, Oracle and/or its affiliates. All rights reserved.
   3  * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
   4  *
   5  * This code is free software; you can redistribute it and/or modify it
   6  * under the terms of the GNU General Public License version 2 only, as
   7  * published by the Free Software Foundation.
   8  *
   9  * This code is distributed in the hope that it will be useful, but WITHOUT
  10  * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
  11  * FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License
  12  * version 2 for more details (a copy is included in the LICENSE file that
  13  * accompanied this code).
  14  *
  15  * You should have received a copy of the GNU General Public License version
  16  * 2 along with this work; if not, write to the Free Software Foundation,
  17  * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.
  18  *
  19  * Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA
  20  * or visit www.oracle.com if you need additional information or have any
  21  * questions.
  22  */
  23 
  24 import java.awt.Color;
  25 import java.awt.Frame;
  26 import java.awt.GraphicsDevice;
  27 import java.awt.GraphicsEnvironment;
  28 import java.awt.Point;
  29 import java.awt.Rectangle;
  30 import java.awt.Robot;
  31 import java.awt.image.BufferedImage;
  32 import java.util.List;
  33 
  34 /**
  35  * @test
  36  * @key headful
  37  * @bug 8215105 8211999
  38  * @summary tests that Robot can capture the common colors without artifacts
  39  */
  40 public final class CheckCommonColors {
  41 
  42     private static final Frame frame = new Frame();
  43     private static Robot robot;
  44 
  45     public static void main(final String[] args) throws Exception {
  46         robot = new Robot();
  47         var ge = GraphicsEnvironment.getLocalGraphicsEnvironment();
  48         for (GraphicsDevice gd : ge.getScreenDevices()) {
  49             try {
  50                 test(gd.getDefaultConfiguration().getBounds());
  51             } finally {
  52                 frame.dispose();
  53             }
  54         }
  55     }
  56 
  57     private static void test(Rectangle screen) {
  58         frame.setSize(400, 400);
  59         frame.setLocation((int)screen.getCenterX() - 200,
  60                           (int)screen.getCenterY() - 200);
  61         frame.setUndecorated(true);
  62         for (final Color color : List.of(Color.WHITE, Color.LIGHT_GRAY,
  63                                          Color.GRAY, Color.DARK_GRAY,
  64                                          Color.BLACK, Color.RED, Color.PINK,
  65                                          Color.ORANGE, Color.YELLOW,
  66                                          Color.GREEN, Color.MAGENTA, Color.CYAN,
  67                                          Color.BLUE)) {
  68             frame.dispose();
  69             frame.setBackground(color);
  70             frame.setVisible(true);
  71             checkPixels(color, true);
  72             checkPixels(color, false);
  73         }
  74     }
  75 
  76     private static void checkPixels(final Color color, boolean useRect) {
  77         System.out.println("color = " + color + ", useRect = " + useRect);
  78         int attempt = 0;
  79         while (true) {
  80             Point p = frame.getLocationOnScreen();
  81             Color pixel;
  82             Rectangle rect = new Rectangle(p.x + frame.getWidth() / 2,
  83                                            p.y + frame.getHeight() / 2, 1, 1);
  84             if (useRect) {
  85                 BufferedImage bi = robot.createScreenCapture(rect);
  86                 pixel = new Color(bi.getRGB(0, 0));
  87             } else {
  88                 pixel = robot.getPixelColor(rect.x, rect.y);
  89             }
  90             if (color.equals(pixel)) {
  91                 return;
  92             }
  93             if (attempt > 10) {
  94                 System.err.println("Expected: " + color);
  95                 System.err.println("Actual: " + pixel);
  96                 throw new RuntimeException("Too many attempts: " + attempt);
  97             }
  98             // skip Robot.waitForIdle to speedup the common case, but also take
  99             // care about slow systems
 100             robot.delay((int) Math.pow(2.2, attempt++));
 101         }
 102     }
 103 }