8076106: [macosx] Drag image of TransferHandler does not honor MultiResolutionImage

Reviewed-by: serb, alexsch
Contributed-by: NHendrik Schreiber <hs@tagtraum.com>

src/macosx/classes/sun/lwawt/macosx/CImage.java

@@ -136,33 +136,35 @@ public class CImage extends CFRetainedResource {
             return ((DataBufferInt)bimg.getRaster().getDataBuffer()).getData();
         }
 
-        public CImage createFromImageImmediately(final Image image) {
-            int[]  buffer = imageToArray(image, false);
-
-            if (buffer == null) {
-                return null;
-            }
+        // This is used to create a CImage from a Image
+        public CImage createFromImage(final Image image) {
+            return createFromImage(image, true);
+        }
 
-            return new CImage(nativeCreateNSImageFromArray(buffer, image.getWidth(null),
-                                                           image.getHeight(null)));
+        public CImage createFromImageImmediately(final Image image) {
+            return createFromImage(image, false);
         }
 
         // This is used to create a CImage from a Image
-        public CImage createFromImage(final Image image) {
+        private CImage createFromImage(final Image image, final boolean prepareImage) {
             if (image instanceof MultiResolutionImage) {
                 List<Image> resolutionVariants
                         = ((MultiResolutionImage) image).getResolutionVariants();
-                return createFromImages(resolutionVariants);
+                return createFromImages(resolutionVariants, prepareImage);
             }
 
-            int[] buffer = imageToArray(image, true);
+            int[] buffer = imageToArray(image, prepareImage);
             if (buffer == null) {
                 return null;
             }
             return new CImage(nativeCreateNSImageFromArray(buffer, image.getWidth(null), image.getHeight(null)));
         }
 
-        public CImage createFromImages(List<Image> images) {
+        public CImage createFromImages(final List<Image> images) {
+            return createFromImages(images, true);
+        }
+
+        private CImage createFromImages(final List<Image> images, final boolean prepareImage) {
             if (images == null || images.isEmpty()) {
                 return null;
             }
@@ -175,8 +177,8 @@ public class CImage extends CFRetainedResource {
 
             num = 0;
 
-            for (Image img : images) {
-                buffers[num] = imageToArray(img, true);
+            for (final Image img : images) {
+                buffers[num] = imageToArray(img, prepareImage);
                 if (buffers[num] == null) {
                     // Unable to process the image
                     continue;
@@ -191,9 +193,9 @@ public class CImage extends CFRetainedResource {
             }
 
             return new CImage(nativeCreateNSImageFromArrays(
-                        Arrays.copyOf(buffers, num),
-                        Arrays.copyOf(w, num),
-                        Arrays.copyOf(h, num)));
+                    Arrays.copyOf(buffers, num),
+                    Arrays.copyOf(w, num),
+                    Arrays.copyOf(h, num)));
         }
 
         static int getSelectorAsInt(final String fromString) {

test/java/awt/datatransfer/DragImage/MultiResolutionDragImageTest.java

+/*
+ * 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 sun.awt.image.MultiResolutionToolkitImage;
+import sun.java2d.SunGraphics2D;
+
+import javax.swing.*;
+import java.awt.*;
+import java.awt.image.BufferedImage;
+
+import static java.awt.event.InputEvent.BUTTON1_DOWN_MASK;
+
+/**
+ * @test
+ * @bug 8076106
+ * @author Hendrik Schreiber
+ * @summary [macosx] Drag image of TransferHandler does not honor
+ * MultiResolutionImage
+ * @run main MultiResolutionDragImageTest TEST_DRAG
+ */
+public class MultiResolutionDragImageTest {
+
+    private static final Color COLOR_1X = Color.BLUE;
+    private static final Color COLOR_2X = Color.RED;
+    private static JFrame frame;
+    private static JTextField field;
+    private static Point p;
+
+    public static void main(String[] args) throws Exception {
+
+        final String test = args[0];
+
+        switch (test) {
+            case "TEST_DRAG":
+                testDrag();
+                break;
+            default:
+                throw new RuntimeException("Unknown test: " + test);
+        }
+    }
+
+    private static void testDrag() throws Exception {
+
+
+        SwingUtilities.invokeAndWait(() -> {
+
+            frame = new JFrame();
+            field = new JTextField("Drag Me");
+            setupFrame(frame, field);
+            frame.setVisible(true);
+        });
+
+        final Robot robot = new Robot();
+        robot.setAutoDelay(500);
+        robot.setAutoWaitForIdle(true);
+        robot.waitForIdle();
+
+        // get mouse into position
+        SwingUtilities.invokeAndWait(() -> {
+
+            p = new Point(field.getWidth() / 2, field.getHeight() / 2);
+            SwingUtilities.convertPointToScreen(p, field);
+        });
+
+        robot.mouseMove(p.x, p.y);
+        // simulate dragging
+        robot.mousePress(BUTTON1_DOWN_MASK);
+        p.translate(10, 10);
+        robot.mouseMove(p.x, p.y);
+
+        p.translate(5, 5);
+        final Color color = robot.getPixelColor(p.x, p.y);
+        robot.mouseRelease(BUTTON1_DOWN_MASK);
+
+        SwingUtilities.invokeAndWait(frame::dispose);
+
+        final float scaleFactor = getScaleFactor();
+        final Color testColor = (1 < scaleFactor) ? COLOR_2X : COLOR_1X;
+
+        if (!similar(testColor, color)) {
+            throw new RuntimeException(
+                    "TEST FAILED: Image with wrong resolution is used for drag image!");
+        }
+        System.out.println("TEST PASSED!");
+    }
+
+    private static void setupFrame(final JFrame frame, final JTextField field) {
+
+        frame.setBounds(0, 0, 50, 50);
+        frame.setLayout(new BorderLayout());
+        field.setDragEnabled(true);
+        final TransferHandler transferHandler = field.getTransferHandler();
+        transferHandler.setDragImage(createMultiResolutionImage());
+        frame.getContentPane().add(field, BorderLayout.CENTER);
+    }
+
+    private static boolean similar(Color c1, Color c2){
+        return similar(c1.getRed(), c2.getRed())
+                && similar(c1.getGreen(), c2.getGreen())
+                && similar(c1.getBlue(), c2.getBlue());
+    }
+
+    private static boolean similar(int n, int m){
+        return Math.abs(n - m) <= 80;
+    }
+
+    private static float getScaleFactor() {
+
+        final Dialog dialog = new Dialog((Window) null);
+        dialog.setSize(100, 100);
+        dialog.setModal(true);
+        final float[] scaleFactors = new float[1];
+        Panel panel = new Panel() {
+
+            @Override
+            public void paint(Graphics g) {
+                float scaleFactor = 1;
+                if (g instanceof SunGraphics2D) {
+                    scaleFactor = ((SunGraphics2D) g).surfaceData.getDefaultScale();
+                }
+                scaleFactors[0] = scaleFactor;
+                dialog.setVisible(false);
+            }
+        };
+
+        dialog.add(panel);
+        dialog.setVisible(true);
+        dialog.dispose();
+
+        return scaleFactors[0];
+    }
+
+    private static Image createMultiResolutionImage() {
+
+        return new MultiResolutionToolkitImage(
+                createImage(50, COLOR_1X),
+                createImage(100, COLOR_2X)
+        );
+
+    }
+
+    private static Image createImage(final int length, final Color color) {
+
+        final BufferedImage image = new BufferedImage(length, length,
+                BufferedImage.TYPE_INT_ARGB_PRE);
+        final Graphics graphics = image.getGraphics();
+        graphics.setColor(color);
+        graphics.fillRect(0, 0, length, length);
+        graphics.dispose();
+        return image;
+    }
+}
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