8139173: [macosx] JInternalFrame shadow is not properly drawn

Reviewed-by: mdoerr
Backport-of: f7814c120bf84d7e9b459f81a6ce19b44fa122ec

Author: Ichiroh Takiguchi

src/java.desktop/macosx/classes/com/apple/laf/AquaInternalFrameBorder.java

@@ -1,5 +1,5 @@
 /*
- * Copyright (c) 2011, 2012, Oracle and/or its affiliates. All rights reserved.
+ * Copyright (c) 2011, 2022, 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
@@ -378,9 +378,7 @@ public void drawWindowTitle(final Graphics g, final JInternalFrame frame, final
         final int x = inX;
         final int y = inY;
         final int w = inW;
-        int h = inH;
-
-        h = metrics.titleBarHeight + inH;
+        final int h = inH;
 
         // paint the background
         titleBarPainter.state.set(frame.isSelected() ? State.ACTIVE : State.INACTIVE);

test/jdk/javax/swing/plaf/aqua/JInternalFrameBorderTest.java

@@ -0,0 +1,143 @@
+/*
+ * Copyright (c) 2022, 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
+ * @key headful
+ * @bug 8139173
+ * @requires (os.family == "mac")
+ * @summary Verify JInternalFrame's border
+ * @run main JInternalFrameBorderTest
+ */
+
+import java.awt.BorderLayout;
+import java.awt.Color;
+import java.awt.Graphics;
+import java.awt.Insets;
+import java.awt.Point;
+import java.awt.Rectangle;
+import java.awt.Robot;
+import javax.swing.JDesktopPane;
+import javax.swing.JFrame;
+import javax.swing.JInternalFrame;
+import javax.swing.SwingUtilities;
+import javax.swing.UIManager;
+
+public class JInternalFrameBorderTest {
+
+    private static JFrame frame;
+    private static JDesktopPane desktopPane;
+    private static JInternalFrame internalFrame;
+    private static final int LIMIT = 100;
+    private static Robot robot;
+    private static Point pos;
+    private static Rectangle rect;
+    private static Insets insets;
+
+    public static void main(String[] args) throws Exception {
+        robot = new Robot();
+        createUI();
+        robot.waitForIdle();
+        robot.delay(1000);
+
+        SwingUtilities.invokeAndWait(() -> {
+            pos = internalFrame.getLocationOnScreen();
+            rect = internalFrame.getBounds();
+            insets = internalFrame.getInsets();
+        });
+        robot.waitForIdle();
+
+        // bottom
+        int x = pos.x + rect.x + rect.width/2;
+        int y = pos.y + rect.y + rect.height - insets.bottom + 1;
+        Color colorBottom = robot.getPixelColor(x, y);
+
+        // left
+        x = pos.x + rect.x + insets.left - 1;
+        y = pos.y + rect.y + rect.height/2;
+        Color colorLeft = robot.getPixelColor(x, y);
+
+        // right
+        x = pos.x + rect.x + rect.width - insets.left + 1;
+        y = pos.y + rect.y + rect.height/2;
+        Color colorRight = robot.getPixelColor(x, y);
+
+        robot.waitForIdle();
+        cleanUp();
+
+        int diff = getDiff(colorLeft, colorBottom);
+        if (diff > LIMIT) {
+            throw new RuntimeException("Unexpected border bottom=" +
+                    colorBottom + " left=" + colorLeft);
+        }
+        diff = getDiff(colorRight, colorBottom);
+        if (diff > LIMIT) {
+            throw new RuntimeException("Unexpected border bottom=" +
+                    colorBottom + " right=" + colorRight);
+        }
+    }
+
+    private static void createUI() throws Exception {
+        SwingUtilities.invokeAndWait(() -> {
+            try {
+                UIManager.setLookAndFeel("com.apple.laf.AquaLookAndFeel");
+            } catch (Exception e) {
+                throw new RuntimeException("Cannot initialize Aqua L&F");
+            }
+            desktopPane = new JDesktopPane() {
+                @Override
+                protected void paintComponent(Graphics g) {
+                    super.paintComponent(g);
+                    g.setColor(Color.BLUE);
+                    g.fillRect(0, 0, getWidth(), getHeight());
+                }
+            };
+            internalFrame = new JInternalFrame();
+            frame = new JFrame();
+            internalFrame.setSize(500, 200);
+            internalFrame.setVisible(true);
+            desktopPane.add(internalFrame);
+
+            frame.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
+            frame.getContentPane().setLayout(new BorderLayout());
+            frame.getContentPane().add(desktopPane, "Center");
+            frame.setSize(500, 500);
+            frame.setLocationRelativeTo(null);
+            frame.setVisible(true);
+            frame.toFront();
+        });
+    }
+
+    private static int getDiff(Color c1, Color c2) {
+        int r = Math.abs(c1.getRed()   - c2.getRed());
+        int g = Math.abs(c1.getGreen() - c2.getGreen());
+        int b = Math.abs(c1.getBlue()  - c2.getBlue());
+        return r + g + b;
+    }
+
+    private static void cleanUp() throws Exception {
+        SwingUtilities.invokeAndWait(() -> {
+            frame.dispose();
+        });
+    }
+}