src/java.desktop/share/classes/sun/java2d/pipe/DrawImage.java

@@ -338,11 +338,11 @@
      *      correspond to the TransformHelpers, which we know we have. And
      *      acceleration can change the type of the surface
      * <li> Image will be used only once and acceleration caching wouldn't help
      * </ul>
      */
-    BufferedImage makeBufferedImage(Image img, Color bgColor, int type,
+    private BufferedImage makeBufferedImage(Image img, Color bgColor, int type,
                                     int sx1, int sy1, int sx2, int sy2)
     {
         final int width = sx2 - sx1;
         final int height = sy2 - sy1;
         final BufferedImage bimg = new BufferedImage(width, height, type);

@@ -428,14 +428,20 @@
             }
         }
 
         if (isBgOperation(srcData, bgColor)) {
             // We cannot perform bg operations during transform so make
-            // an opaque temp image with the appropriate background
-            // and work from there.
-            img = makeBufferedImage(img, bgColor, BufferedImage.TYPE_INT_RGB,
-                                    sx1, sy1, sx2, sy2);
+            // a temp image with the appropriate background based on
+            // background alpha value and work from there. If background
+            // alpha is opaque use INT_RGB else use INT_ARGB so that we
+            // will not lose translucency of background.
+
+            int bgAlpha = bgColor.getAlpha();
+            int type = ((bgAlpha == 255)
+                        ? BufferedImage.TYPE_INT_RGB
+                        : BufferedImage.TYPE_INT_ARGB);
+            img = makeBufferedImage(img, bgColor, type, sx1, sy1, sx2, sy2);
             // Temp image has appropriate subimage at 0,0 now.
             sx2 -= sx1;
             sy2 -= sy1;
             sx1 = sy1 = 0;