8215105: java/awt/Robot/HiDPIScreenCapture/ScreenCaptureTest.java: Wrong Pixel Color

Reviewed-by: prr

src/java.desktop/macosx/native/libawt_lwawt/awt/CRobot.m

@@ -300,7 +300,7 @@ Java_sun_lwawt_macosx_CRobot_nativeGetScreenPixels
 
     // create a graphics context around the Java int array
     CGColorSpaceRef picColorSpace = CGColorSpaceCreateWithName(
-                                            kCGColorSpaceGenericRGB);
+                                            kCGColorSpaceSRGB);
     CGContextRef jPicContextRef = CGBitmapContextCreate(
                                             jPixelData,
                                             picWidth, picHeight,

test/jdk/java/awt/Robot/CheckCommonColors/CheckCommonColors.java

@@ -0,0 +1,86 @@
+/*
+ * Copyright (c) 2018, 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.Color;
+import java.awt.Frame;
+import java.awt.Point;
+import java.awt.Robot;
+import java.util.List;
+
+/**
+ * @test
+ * @key headful
+ * @bug 8215105
+ * @summary tests that Robot can capture the common colors without artifacts
+ */
+public final class CheckCommonColors {
+
+    private static final Frame frame = new Frame();
+    private static Robot robot;
+
+    public static void main(final String[] args) throws Exception {
+        robot = new Robot();
+        try {
+            test();
+        } finally {
+            frame.dispose();
+        }
+    }
+
+    private static void test() {
+        frame.setSize(400, 400);
+        frame.setLocationRelativeTo(null);
+        frame.setUndecorated(true);
+        for (final Color color : List.of(Color.WHITE, Color.LIGHT_GRAY,
+                                         Color.GRAY, Color.DARK_GRAY,
+                                         Color.BLACK, Color.RED, Color.PINK,
+                                         Color.ORANGE, Color.YELLOW,
+                                         Color.GREEN, Color.MAGENTA, Color.CYAN,
+                                         Color.BLUE)) {
+            frame.dispose();
+            frame.setBackground(color);
+            frame.setVisible(true);
+            checkPixels(color);
+        }
+    }
+
+    private static void checkPixels(final Color color) {
+        int attempt = 0;
+        while (true) {
+            Point p = frame.getLocationOnScreen();
+            Color pixel = robot.getPixelColor(p.x + frame.getWidth() / 2,
+                                              p.y + frame.getHeight() / 2);
+            if (color.equals(pixel)) {
+                return;
+            }
+            if (attempt > 10) {
+                System.err.println("Expected: " + color);
+                System.err.println("Actual: " + pixel);
+                throw new RuntimeException("Too many attempts: " + attempt);
+            }
+            // skip Robot.waitForIdle to speedup the common case, but also take
+            // care about slow systems
+            robot.delay((int) Math.pow(2.2, attempt++));
+        }
+    }
+}