8039345: Strange behaviour of per-pixel translucency on linux

Reviewed-by: prr, azvegint

jdk/src/java.desktop/unix/classes/sun/java2d/xr/XRSurfaceData.java

@@ -548,8 +548,18 @@ public abstract class XRSurfaceData extends XSurfaceData {
                   peer.getColorModel().getPixelSize(), Transparency.OPAQUE);
 
             if (isXRDrawableValid()) {
-                initXRender(XRUtils.
-                    getPictureFormatForTransparency(Transparency.OPAQUE));
+                // If we have a 32 bit color model for the window it needs
+                // alpha to support translucency of the window so we need
+                // to get the ARGB32 XRender picture format else for
+                // 24 bit colormodel we need RGB24 or OPAQUE pictureformat.
+                if (peer.getColorModel().getPixelSize() == 32) {
+                     initXRender(XRUtils.
+                      getPictureFormatForTransparency(Transparency.TRANSLUCENT));
+                 }
+                 else {
+                     initXRender(XRUtils.
+                       getPictureFormatForTransparency(Transparency.OPAQUE));
+                 }
                 makePipes();
             }
         }

jdk/test/sun/java2d/XRSurfaceData/ComponentResizeTest.java

@@ -0,0 +1,100 @@
+/*
+ * Copyright (c) 2015, 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.FlowLayout;
+import javax.swing.JButton;
+import javax.swing.JCheckBox;
+import javax.swing.JFrame;
+import javax.swing.SwingUtilities;
+import java.awt.Component;
+import javax.swing.JOptionPane;
+
+/**
+ * @test
+ * @bug 8039345
+ * @author Prasanta Sadhukhan
+ * @run main/manual ComponentResizeTest
+ * @summary Resizes JFrame so that component drawn inside it gets repainted
+ * without leaving any trails
+ */
+public class ComponentResizeTest {
+
+    private static JFrame demoFrame;
+
+    public static void testresize() throws Exception {
+        Thread.sleep(5000);
+        for (int i = 0; i < 20; i++) {
+            SwingUtilities.invokeLater(() -> {
+                demoFrame.setSize(demoFrame.getWidth() + 5, demoFrame.getHeight() + 5);
+            });
+            Thread.sleep(1000);
+        }
+    }
+
+    public static void main(String[] args) throws Exception {
+        SwingUtilities.invokeAndWait(() -> {
+            JOptionPane.showMessageDialog(
+                    (Component) null,
+                    "The test creates a transparent JFrame and resizes the JFrame. Please verify JFrame is transparent and components (like JButton, checkbox) move without leaving any trails",
+                    "information", JOptionPane.INFORMATION_MESSAGE);
+            createAndShowGUI();
+        });
+
+        try {
+            testresize();
+        } finally {
+            SwingUtilities.invokeLater(() -> {
+                demoFrame.dispose();
+            });
+        }
+
+        SwingUtilities.invokeAndWait(() -> {
+            int confirm = JOptionPane.showConfirmDialog(
+                    (Component) null,
+                    "Did the component resize work without leaving any trails?",
+                    "alert", JOptionPane.YES_NO_OPTION);
+            if (confirm == JOptionPane.YES_OPTION) {
+                System.out.println("Test passed");
+            } else {
+                System.out.println("Test failed");
+                throw new RuntimeException("Component resize leaves trail");
+            }
+        });
+    }
+
+    private static void createAndShowGUI() {
+        demoFrame = new JFrame();
+        demoFrame.setSize(300, 300);
+        demoFrame.setLayout(new FlowLayout());
+        demoFrame.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
+        demoFrame.setUndecorated(true);
+        demoFrame.setBackground(new Color(0f, 0, 0, 0.1f));
+        JCheckBox b = new JCheckBox("Whatever");
+        demoFrame.paintAll(null);
+        b.setOpaque(true);
+        demoFrame.add(b);
+        demoFrame.add(new JButton());
+        demoFrame.setVisible(true);
+    }
+}