8016524: [macosx] Bottom line is not visible for JTableHeader

Reviewed-by: psadhukhan, prr

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

@@ -1,5 +1,5 @@
 /*
- * Copyright (c) 2011, 2014, 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
@@ -105,7 +105,7 @@ public class AquaTableHeaderBorder extends AbstractBorder {
         final int newWidth = width;
         final int newHeight = height;
 
-        painter.paint(g, c, newX - 1, newY - 1, newWidth + 1, newHeight);
+        painter.paint(g, c, newX - 1, newY - 1, newWidth + 1, newHeight + 1);
 
         // Draw the header
         g.clipRect(newX, y, newWidth, height);

test/jdk/javax/swing/JTableHeader/8016524/JTHeaderBorderTest.java

@@ -0,0 +1,123 @@
+/*
+ * 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
+ * @bug 8016524
+ * @requires (os.family=="mac")
+ * @key headful
+ * @summary Tests whether the bottom line of JTableHeader border is visible for MacOS default LAF
+ * @run main JTHeaderBorderTest
+ */
+
+import java.awt.Graphics2D;
+import javax.imageio.ImageIO;
+import javax.swing.JFrame;
+import javax.swing.JTable;
+import javax.swing.JScrollPane;
+import javax.swing.SwingUtilities;
+import javax.swing.UIManager;
+import javax.swing.UnsupportedLookAndFeelException;
+import java.awt.image.BufferedImage;
+import java.io.File;
+import java.io.IOException;
+
+import static java.awt.image.BufferedImage.TYPE_INT_ARGB;
+
+public class JTHeaderBorderTest {
+
+    private static JFrame frame;
+    private static JTable table;
+    private static JScrollPane scrollableTable;
+
+    private static final int FRAME_HT = 300;
+    private static final int FRAME_WT = 300;
+    private static final int TABLE_COLS = 3;
+    private static final int TABLE_ROWS = 2;
+    private static final int Y_OFFSET_START = 30;
+    private static final int Y_OFFSET_END = 55;
+    private static final int X_OFFSET = 25;
+
+    public static void main(String[] args) throws Exception {
+
+        try {
+            try {
+                UIManager.setLookAndFeel(UIManager.getSystemLookAndFeelClassName());
+            } catch (ClassNotFoundException | InstantiationException | IllegalAccessException
+                    | UnsupportedLookAndFeelException e) {
+                throw new RuntimeException("Unsupported Look&Feel Class");
+            }
+
+            SwingUtilities.invokeAndWait(() -> {
+                table = new JTable(TABLE_ROWS, TABLE_COLS);
+                scrollableTable = new JScrollPane(table);
+
+                frame = new JFrame();
+                frame.getContentPane().add(scrollableTable);
+                frame.setSize(FRAME_WT, FRAME_HT);
+                frame.setLocationRelativeTo(null);
+                frame.setVisible(true);
+                frame.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
+
+                // paint JFrame to BufferedImage
+                BufferedImage image = new BufferedImage(FRAME_WT, FRAME_HT, TYPE_INT_ARGB);
+                Graphics2D graphics2D = image.createGraphics();
+                frame.paint(graphics2D);
+                graphics2D.dispose();
+
+                int tableColor = table.getBackground().getRGB();
+                int headerColor = table.getTableHeader().getBackground().getRGB();
+                //at start pixelColor initialized to table header background color
+                int pixelColor = headerColor;
+                boolean isBottomLineVisible = false;
+
+                // scan table header region to check if bottom border of JTableHeader is visible
+                for (int y = Y_OFFSET_START; y <= Y_OFFSET_END; y++) {
+                    pixelColor = image.getRGB(X_OFFSET, y);
+                    System.out.println("Y offset: "+ y + " Color: "+ (Integer.toHexString(image.getRGB(X_OFFSET, y))));
+                    if (pixelColor != tableColor || pixelColor != headerColor) {
+                        isBottomLineVisible = true;
+                        break;
+                    }
+                }
+                // throw Runtime Exception if border is not visible in the scanned region
+                if (!isBottomLineVisible) {
+                    saveImage(image, "JTableHeader.png");
+                    throw new RuntimeException("JTableHeader Bottom Border not visible");
+                }
+            });
+        } finally {
+            if (frame != null) {
+                SwingUtilities.invokeAndWait(()-> frame.dispose());
+            }
+        }
+    }
+    // to save the BufferedImage as .png in the event the test fails (for debugging purpose)
+    private static void saveImage(BufferedImage image, String filename) {
+        try {
+            ImageIO.write(image, "png", new File(filename));
+        } catch (IOException e) {
+            e.printStackTrace();
+        }
+    }
+}