7049339: AnyBlit is broken with non-rectangular clips.

Reviewed-by: flar

src/share/classes/sun/java2d/loops/Blit.java

@@ -172,11 +172,11 @@ public class Blit extends GraphicsPrimitive
             while (si.nextSpan(span)) {
                 int w = span[2] - span[0];
                 int h = span[3] - span[1];
-                srcRas = srcRas.createChild(srcx + span[0], srcy + span[1],
-                                            w, h, 0, 0, null);
-                dstRas = dstRas.createWritableChild(span[0], span[1],
-                                                    w, h, 0, 0, null);
-                ctx.compose(srcRas, dstRas, dstRas);
+                Raster tmpSrcRas = srcRas.createChild(srcx + span[0], srcy + span[1],
+                                                      w, h, 0, 0, null);
+                WritableRaster tmpDstRas = dstRas.createWritableChild(span[0], span[1],
+                                                                      w, h, 0, 0, null);
+                ctx.compose(tmpSrcRas, tmpDstRas, tmpDstRas);
             }
             ctx.dispose();
         }

test/sun/java2d/loops/Bug7049339.java

+/*
+ * Copyright 2011 Red Hat, Inc.  All Rights Reserved.
+ * Copyright (c) 2011, 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 7049339
+  @summary Copying images with a non-rectangular clip and a custom composite
+           fails
+  @author Denis Lila <dlila@redhat.com>
+  @run main Bug7049339
+ */
+
+import java.awt.Composite;
+import java.awt.CompositeContext;
+import java.awt.Graphics2D;
+import java.awt.RenderingHints;
+import java.awt.Shape;
+import java.awt.geom.Ellipse2D;
+import java.awt.image.BufferedImage;
+import java.awt.image.ColorModel;
+import java.awt.image.Raster;
+import java.awt.image.WritableRaster;
+
+public class Bug7049339 {
+    public static void main(String[] argv) {
+        int x = 100, y = 100;
+        BufferedImage src = new BufferedImage(x, y, BufferedImage.TYPE_INT_ARGB);
+        BufferedImage dst = new BufferedImage(x, y, BufferedImage.TYPE_3BYTE_BGR);
+
+        Graphics2D dstg2d = dst.createGraphics();
+        dstg2d.setComposite(new Composite() {
+            @Override
+            public CompositeContext createContext(
+                    ColorModel srcColorModel,
+                    ColorModel dstColorModel,
+                    RenderingHints hints)
+            {
+                return new CompositeContext() {
+                    @Override
+                    public void compose(Raster src, Raster dstIn,
+                            WritableRaster dstOut)
+                    {
+                        // do nothing
+                    }
+                    @Override
+                    public void dispose() {
+                    }
+                };
+            }
+        });
+        Shape clip = new Ellipse2D.Double(x/4, y/4, x/2, y/2);
+        dstg2d.setClip(clip);
+        // This will throw a RasterFormatException if the bug is present.
+        dstg2d.drawImage(src, 0, 0, null);
+    }
+}