--- a/src/java.desktop/unix/classes/sun/java2d/xr/XRGraphicsConfig.java	Tue Jul 31 14:03:39 2018 -0700
+++ b/src/java.desktop/unix/classes/sun/java2d/xr/XRGraphicsConfig.java	Tue Jul 31 14:04:29 2018 -0700
@@ -30,9 +30,14 @@
 
 package sun.java2d.xr;
 
-import sun.awt.*;
-import sun.awt.image.*;
-import sun.java2d.*;
+import java.awt.Transparency;
+import sun.awt.X11GraphicsConfig;
+import sun.awt.X11ComponentPeer;
+import sun.awt.X11GraphicsDevice;
+import sun.awt.X11GraphicsEnvironment;
+import sun.awt.image.SurfaceManager;
+import sun.java2d.SurfaceData;
+import sun.java2d.loops.SurfaceType;
 
 public class XRGraphicsConfig extends X11GraphicsConfig implements
         SurfaceManager.ProxiedGraphicsConfig {
@@ -58,4 +63,14 @@
     public Object getProxyKey() {
         return this;
     }
+
+    public synchronized SurfaceType getSurfaceType() {
+        if (surfaceType != null) {
+            return surfaceType;
+        }
+
+        surfaceType = XRSurfaceData.getSurfaceType(this, Transparency.OPAQUE);
+        return surfaceType;
+    }
+
 }

--- a/src/java.desktop/unix/classes/sun/java2d/xr/XRSurfaceData.java	Tue Jul 31 14:03:39 2018 -0700
+++ b/src/java.desktop/unix/classes/sun/java2d/xr/XRSurfaceData.java	Tue Jul 31 14:04:29 2018 -0700
@@ -25,17 +25,36 @@
 
 package sun.java2d.xr;
 
-import java.awt.*;
-import java.awt.geom.*;
-import java.awt.image.*;
-import sun.awt.*;
+import java.awt.AlphaComposite;
+import java.awt.GraphicsConfiguration;
+import java.awt.GraphicsDevice;
+import java.awt.GraphicsEnvironment;
+import java.awt.Image;
+import java.awt.Rectangle;
+import java.awt.Transparency;
+import java.awt.geom.AffineTransform;
+import java.awt.image.ColorModel;
+import java.awt.image.DirectColorModel;
+import java.awt.image.Raster;
+import sun.awt.SunHints;
+import sun.awt.SunToolkit;
+import sun.awt.X11ComponentPeer;
+import sun.awt.image.PixelConverter;
 import sun.java2d.InvalidPipeException;
 import sun.java2d.SunGraphics2D;
 import sun.java2d.SurfaceData;
 import sun.java2d.SurfaceDataProxy;
-import sun.java2d.loops.*;
-import sun.java2d.pipe.*;
-import sun.java2d.x11.*;
+import sun.java2d.loops.CompositeType;
+import sun.java2d.loops.MaskFill;
+import sun.java2d.loops.RenderLoops;
+import sun.java2d.loops.SurfaceType;
+import sun.java2d.loops.XORComposite;
+import sun.java2d.pipe.PixelToShapeConverter;
+import sun.java2d.pipe.Region;
+import sun.java2d.pipe.ShapeDrawPipe;
+import sun.java2d.pipe.TextPipe;
+import sun.java2d.pipe.ValidatePipe;
+import sun.java2d.x11.XSurfaceData;
 import sun.font.FontManagerNativeLibrary;
 
 public abstract class XRSurfaceData extends XSurfaceData {
@@ -63,7 +82,8 @@
     public static final SurfaceType
         ByteA8X11 = SurfaceType.ByteGray.deriveSubType(DESC_BYTE_A8_X11);
     public static final SurfaceType
-        IntRgbX11 = SurfaceType.IntRgb.deriveSubType(DESC_INT_RGB_X11);
+        IntRgbX11 = SurfaceType.IntRgb.deriveSubType(DESC_INT_RGB_X11,
+                                              PixelConverter.ArgbPre.instance);
     public static final SurfaceType
         IntArgbPreX11 = SurfaceType.IntArgbPre.deriveSubType(DESC_INT_ARGB_X11);
 

--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/test/jdk/java/awt/Color/AlphaColorTest.java	Tue Jul 31 14:04:29 2018 -0700
@@ -0,0 +1,83 @@
+/*
+ * 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.
+ */
+
+/**
+ * @test
+ * @key headful
+ * @bug 8204931
+ * @summary test alpha colors are blended with background.
+ */
+
+import java.awt.Color;
+import java.awt.Component;
+import java.awt.Dimension;
+import java.awt.Frame;
+import java.awt.Graphics;
+import java.awt.Robot;
+import javax.swing.SwingUtilities;
+
+public class AlphaColorTest extends Component {
+
+    private Color color;
+
+    public AlphaColorTest(Color c) {
+       this.color = c;
+    }
+
+    public void paint(Graphics g) {
+        g.setColor(color);
+        g.fillRect(0, 0, getSize().width, getSize().height);
+    }
+
+    public Dimension getPreferredSize() {
+        return getSize();
+    }
+
+    public Dimension getSize() {
+        return new Dimension(200, 200);
+    }
+
+    public static void main(String args[]) throws Exception {
+        SwingUtilities.invokeAndWait(() -> createAndShowGUI());
+        Robot robot = new Robot();
+        robot.delay(5000);
+        robot.waitForIdle();
+        Color c = robot.getPixelColor(frame.getX() + 100, frame.getY() + 100);
+        int red = c.getRed();
+        frame.dispose();
+        // Should be 126-128, but be tolerant of gamma correction.
+        if (red < 122 || red > 132) {
+            throw new RuntimeException("Color is not as expected. Got " + c);
+        }
+     }
+
+    static Frame frame;
+    private static void createAndShowGUI() {
+        frame = new Frame("Alpha Color Test");
+        frame.setBackground(Color.black);
+        Color color = new Color(255, 255, 255, 127);
+        frame.add("Center", new AlphaColorTest(color));
+        frame.pack();
+        frame.setVisible(true);
+    }
+}