8062164: Incorrect color conversion, when bicubic interpolation is used

Reviewed-by: flar, prr

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

@@ -510,7 +510,7 @@ public class DrawImage implements DrawImagePipe
         // We need to transform to a temp image and then copy
         // just the pieces that are valid data to the dest.
         BufferedImage tmpimg = new BufferedImage(dx2-dx1, dy2-dy1,
-                                                 BufferedImage.TYPE_INT_ARGB);
+                                                 BufferedImage.TYPE_INT_ARGB_PRE);
         SurfaceData tmpData = SurfaceData.getPrimarySurfaceData(tmpimg);
         SurfaceType tmpType = tmpData.getSurfaceType();
         MaskBlit tmpmaskblit =

test/java/awt/image/DrawImage/IncorrectAlphaConversionBicubic.java

+/*
+ * Copyright (c) 2014, 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.AlphaComposite;
+import java.awt.Color;
+import java.awt.Graphics2D;
+import java.awt.GraphicsConfiguration;
+import java.awt.GraphicsDevice;
+import java.awt.GraphicsEnvironment;
+import java.awt.RenderingHints;
+import java.awt.image.BufferedImage;
+import java.awt.image.DataBuffer;
+import java.awt.image.DataBufferByte;
+import java.awt.image.DataBufferInt;
+import java.awt.image.DataBufferShort;
+import java.awt.image.VolatileImage;
+
+import static java.awt.Transparency.TRANSLUCENT;
+
+/**
+ * @test
+ * @bug 8062164
+ * @summary We should get correct alpha, when we draw to/from VolatileImage and
+ *          bicubic interpolation is enabled
+ * @author Sergey Bylokhov
+ */
+public final class IncorrectAlphaConversionBicubic {
+
+    private static final Color RGB = new Color(200, 255, 7, 123);
+    private static final int SIZE = 100;
+
+    public static void main(final String[] args) {
+        final GraphicsEnvironment ge =
+                GraphicsEnvironment.getLocalGraphicsEnvironment();
+        final GraphicsDevice gd = ge.getDefaultScreenDevice();
+        final GraphicsConfiguration gc = gd.getDefaultConfiguration();
+        final VolatileImage vi =
+                gc.createCompatibleVolatileImage(SIZE, SIZE, TRANSLUCENT);
+        final BufferedImage bi = makeUnmanagedBI(gc, TRANSLUCENT);
+        final int expected = bi.getRGB(2, 2);
+
+        int attempt = 0;
+        BufferedImage snapshot;
+        while (true) {
+            if (++attempt > 10) {
+                throw new RuntimeException("Too many attempts: " + attempt);
+            }
+            vi.validate(gc);
+            final Graphics2D g2d = vi.createGraphics();
+            g2d.setComposite(AlphaComposite.Src);
+            g2d.scale(2, 2);
+            g2d.setRenderingHint(RenderingHints.KEY_INTERPOLATION,
+                                 RenderingHints.VALUE_INTERPOLATION_BICUBIC);
+            g2d.drawImage(bi, 0, 0, null);
+            g2d.dispose();
+
+            snapshot = vi.getSnapshot();
+            if (vi.contentsLost()) {
+                continue;
+            }
+            break;
+        }
+        final int actual = snapshot.getRGB(2, 2);
+        if (actual != expected) {
+            System.err.println("Actual: " + Integer.toHexString(actual));
+            System.err.println("Expected: " + Integer.toHexString(expected));
+            throw new RuntimeException("Test failed");
+        }
+    }
+
+    private static BufferedImage makeUnmanagedBI(GraphicsConfiguration gc,
+                                                 int type) {
+        BufferedImage img = gc.createCompatibleImage(SIZE, SIZE, type);
+        Graphics2D g2d = img.createGraphics();
+        g2d.setColor(RGB);
+        g2d.fillRect(0, 0, SIZE, SIZE);
+        g2d.dispose();
+        final DataBuffer db = img.getRaster().getDataBuffer();
+        if (db instanceof DataBufferInt) {
+            ((DataBufferInt) db).getData();
+        } else if (db instanceof DataBufferShort) {
+            ((DataBufferShort) db).getData();
+        } else if (db instanceof DataBufferByte) {
+            ((DataBufferByte) db).getData();
+        } else {
+            try {
+                img.setAccelerationPriority(0.0f);
+            } catch (final Throwable ignored) {
+            }
+        }
+        return img;
+    }
+}