jdk/test/java/awt/image/MultiResolutionImageTest.java
changeset 23256 d71287a532f8
child 31448 1066345d2a8a
--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/jdk/test/java/awt/image/MultiResolutionImageTest.java	Thu Jan 09 18:04:31 2014 +0400
@@ -0,0 +1,620 @@
+/*
+ * Copyright (c) 2013, 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.Color;
+import java.awt.Graphics;
+import java.awt.Graphics2D;
+import java.awt.Image;
+import java.awt.Toolkit;
+import java.awt.image.BufferedImage;
+import java.io.File;
+import java.lang.reflect.Method;
+import java.net.URL;
+import javax.imageio.ImageIO;
+import sun.awt.OSInfo;
+import sun.awt.SunHints;
+import java.awt.MediaTracker;
+import java.awt.geom.AffineTransform;
+import java.awt.image.ImageObserver;
+import java.util.Arrays;
+import java.util.List;
+import javax.swing.JPanel;
+import sun.awt.SunToolkit;
+import sun.awt.image.MultiResolutionImage;
+
+/**
+ * @test
+ * @bug 8011059
+ * @author Alexander Scherbatiy
+ * @summary [macosx] Make JDK demos look perfect on retina displays
+ * @run main MultiResolutionImageTest CUSTOM
+ * @run main MultiResolutionImageTest TOOLKIT_PREPARE
+ * @run main MultiResolutionImageTest TOOLKIT_LOAD
+ * @run main MultiResolutionImageTest TOOLKIT
+ */
+public class MultiResolutionImageTest {
+
+    private static final int IMAGE_WIDTH = 300;
+    private static final int IMAGE_HEIGHT = 200;
+    private static final Color COLOR_1X = Color.GREEN;
+    private static final Color COLOR_2X = Color.BLUE;
+    private static final String IMAGE_NAME_1X = "image.png";
+    private static final String IMAGE_NAME_2X = "image@2x.png";
+
+    public static void main(String[] args) throws Exception {
+
+        System.out.println("args: " + args.length);
+
+        if (args.length == 0) {
+            throw new RuntimeException("Not found a test");
+        }
+
+        String test = args[0];
+
+        System.out.println("TEST: " + test);
+        System.out.println("CHECK OS: " + checkOS());
+
+        if ("CUSTOM".equals(test)) {
+            testCustomMultiResolutionImage();
+        } else if (checkOS()) {
+            switch (test) {
+                case "CUSTOM":
+                    break;
+                case "TOOLKIT_PREPARE":
+                    testToolkitMultiResolutionImagePrepare();
+                    break;
+                case "TOOLKIT_LOAD":
+                    testToolkitMultiResolutionImageLoad();
+                    break;
+                case "TOOLKIT":
+                    testToolkitMultiResolutionImage();
+                    testImageNameTo2xParsing();
+                    break;
+                default:
+                    throw new RuntimeException("Unknown test: " + test);
+            }
+        }
+    }
+
+    static boolean checkOS() {
+        return OSInfo.getOSType() == OSInfo.OSType.MACOSX;
+    }
+
+    public static void testCustomMultiResolutionImage() {
+        testCustomMultiResolutionImage(false);
+        testCustomMultiResolutionImage(true);
+    }
+
+    public static void testCustomMultiResolutionImage(boolean enableImageScaling) {
+
+        Image image = new MultiResolutionBufferedImage();
+
+        // Same image size
+        BufferedImage bufferedImage = new BufferedImage(IMAGE_WIDTH, IMAGE_HEIGHT,
+                BufferedImage.TYPE_INT_RGB);
+        Graphics2D g2d = (Graphics2D) bufferedImage.getGraphics();
+        setImageScalingHint(g2d, enableImageScaling);
+        g2d.drawImage(image, 0, 0, null);
+        checkColor(bufferedImage.getRGB(3 * IMAGE_WIDTH / 4, 3 * IMAGE_HEIGHT / 4), false);
+
+        // Twice image size
+        bufferedImage = new BufferedImage(2 * IMAGE_WIDTH, 2 * IMAGE_HEIGHT,
+                BufferedImage.TYPE_INT_RGB);
+        g2d = (Graphics2D) bufferedImage.getGraphics();
+        setImageScalingHint(g2d, enableImageScaling);
+        g2d.drawImage(image, 0, 0, 2 * IMAGE_WIDTH, 2 * IMAGE_HEIGHT, 0, 0, IMAGE_WIDTH, IMAGE_HEIGHT, null);
+        checkColor(bufferedImage.getRGB(3 * IMAGE_WIDTH / 2, 3 * IMAGE_HEIGHT / 2), enableImageScaling);
+
+        // Scale 2x
+        bufferedImage = new BufferedImage(2 * IMAGE_WIDTH, 2 * IMAGE_HEIGHT, BufferedImage.TYPE_INT_RGB);
+        g2d = (Graphics2D) bufferedImage.getGraphics();
+        setImageScalingHint(g2d, enableImageScaling);
+        g2d.scale(2, 2);
+        g2d.drawImage(image, 0, 0, IMAGE_WIDTH, IMAGE_HEIGHT, null);
+        checkColor(bufferedImage.getRGB(3 * IMAGE_WIDTH / 2, 3 * IMAGE_HEIGHT / 2), enableImageScaling);
+
+        // Rotate
+        bufferedImage = new BufferedImage(IMAGE_WIDTH, IMAGE_HEIGHT,
+                BufferedImage.TYPE_INT_RGB);
+        g2d = (Graphics2D) bufferedImage.getGraphics();
+        setImageScalingHint(g2d, enableImageScaling);
+        g2d.drawImage(image, 0, 0, null);
+        g2d.rotate(Math.PI / 4);
+        checkColor(bufferedImage.getRGB(3 * IMAGE_WIDTH / 4, 3 * IMAGE_HEIGHT / 4), false);
+
+        // Scale 2x and Rotate
+        bufferedImage = new BufferedImage(2 * IMAGE_WIDTH, 2 * IMAGE_HEIGHT, BufferedImage.TYPE_INT_RGB);
+        g2d = (Graphics2D) bufferedImage.getGraphics();
+        setImageScalingHint(g2d, enableImageScaling);
+        g2d.scale(-2, 2);
+        g2d.rotate(-Math.PI / 10);
+        g2d.drawImage(image, -IMAGE_WIDTH, 0, IMAGE_WIDTH, IMAGE_HEIGHT, null);
+        checkColor(bufferedImage.getRGB(3 * IMAGE_WIDTH / 2, 3 * IMAGE_HEIGHT / 2), enableImageScaling);
+
+        // General Transform
+        bufferedImage = new BufferedImage(2 * IMAGE_WIDTH, 2 * IMAGE_HEIGHT, BufferedImage.TYPE_INT_RGB);
+        g2d = (Graphics2D) bufferedImage.getGraphics();
+        setImageScalingHint(g2d, enableImageScaling);
+        float delta = 0.05f;
+        float cos = 1 - delta * delta / 2;
+        float sin = 1 + delta;
+        AffineTransform transform = new AffineTransform(2 * cos, 0.1, 0.3, -2 * sin, 10, -5);
+        g2d.setTransform(transform);
+        g2d.drawImage(image, 0, -IMAGE_HEIGHT, IMAGE_WIDTH, IMAGE_HEIGHT, null);
+        checkColor(bufferedImage.getRGB(3 * IMAGE_WIDTH / 2, 3 * IMAGE_HEIGHT / 2), enableImageScaling);
+
+        int D = 10;
+        // From Source to small Destination region
+        bufferedImage = new BufferedImage(IMAGE_WIDTH, IMAGE_HEIGHT, BufferedImage.TYPE_INT_RGB);
+        g2d = (Graphics2D) bufferedImage.getGraphics();
+        setImageScalingHint(g2d, enableImageScaling);
+        g2d.drawImage(image, IMAGE_WIDTH / 2, IMAGE_HEIGHT / 2, IMAGE_WIDTH - D, IMAGE_HEIGHT - D,
+                D, D, IMAGE_WIDTH - D, IMAGE_HEIGHT - D, null);
+        checkColor(bufferedImage.getRGB(3 * IMAGE_WIDTH / 4, 3 * IMAGE_HEIGHT / 4), false);
+
+        // From Source to large Destination region
+        bufferedImage = new BufferedImage(2 * IMAGE_WIDTH, 2 * IMAGE_HEIGHT, BufferedImage.TYPE_INT_RGB);
+        g2d = (Graphics2D) bufferedImage.getGraphics();
+        setImageScalingHint(g2d, enableImageScaling);
+        g2d.drawImage(image, D, D, 2 * IMAGE_WIDTH - D, 2 * IMAGE_HEIGHT - D,
+                IMAGE_WIDTH / 2, IMAGE_HEIGHT / 2, IMAGE_WIDTH - D, IMAGE_HEIGHT - D, null);
+        checkColor(bufferedImage.getRGB(3 * IMAGE_WIDTH / 2, 3 * IMAGE_HEIGHT / 2), enableImageScaling);
+    }
+
+    static class MultiResolutionBufferedImage extends BufferedImage
+            implements MultiResolutionImage {
+
+        Image highResolutionImage;
+
+        public MultiResolutionBufferedImage() {
+            super(IMAGE_WIDTH, IMAGE_HEIGHT, BufferedImage.TYPE_INT_RGB);
+            highResolutionImage = new BufferedImage(
+                    2 * IMAGE_WIDTH, 2 * IMAGE_HEIGHT, BufferedImage.TYPE_INT_RGB);
+            draw(getGraphics(), 1);
+            draw(highResolutionImage.getGraphics(), 2);
+        }
+
+        void draw(Graphics graphics, float resolution) {
+            Graphics2D g2 = (Graphics2D) graphics;
+            g2.scale(resolution, resolution);
+            g2.setColor((resolution == 1) ? COLOR_1X : COLOR_2X);
+            g2.fillRect(0, 0, IMAGE_WIDTH, IMAGE_HEIGHT);
+        }
+
+        @Override
+        public Image getResolutionVariant(int width, int height) {
+            return ((width <= getWidth() && height <= getHeight()))
+                    ? this : highResolutionImage;
+        }
+
+        @Override
+        public List<Image> getResolutionVariants() {
+            return Arrays.asList(this, highResolutionImage);
+        }
+    }
+
+    static void testToolkitMultiResolutionImagePrepare() throws Exception {
+
+        generateImages();
+
+        File imageFile = new File(IMAGE_NAME_1X);
+        String fileName = imageFile.getAbsolutePath();
+
+        Image image = Toolkit.getDefaultToolkit().getImage(fileName);
+
+        SunToolkit toolkit = (SunToolkit) Toolkit.getDefaultToolkit();
+        toolkit.prepareImage(image, IMAGE_WIDTH, IMAGE_HEIGHT, new LoadImageObserver(image));
+
+        testToolkitMultiResolutionImageLoad(image);
+    }
+
+    static void testToolkitMultiResolutionImageLoad() throws Exception {
+
+        generateImages();
+
+        File imageFile = new File(IMAGE_NAME_1X);
+        String fileName = imageFile.getAbsolutePath();
+        Image image = Toolkit.getDefaultToolkit().getImage(fileName);
+        testToolkitMultiResolutionImageLoad(image);
+    }
+
+    static void testToolkitMultiResolutionImageLoad(Image image) throws Exception {
+
+        MediaTracker tracker = new MediaTracker(new JPanel());
+        tracker.addImage(image, 0);
+        tracker.waitForID(0);
+        if (tracker.isErrorAny()) {
+            throw new RuntimeException("Error during image loading");
+        }
+        tracker.removeImage(image, 0);
+
+        testImageLoaded(image);
+
+        int w = image.getWidth(null);
+        int h = image.getHeight(null);
+
+        Image resolutionVariant = ((MultiResolutionImage) image)
+                .getResolutionVariant(2 * w, 2 * h);
+
+        if (image == resolutionVariant) {
+            throw new RuntimeException("Resolution variant is not loaded");
+        }
+
+        testImageLoaded(resolutionVariant);
+    }
+
+    static void testImageLoaded(Image image) {
+
+        SunToolkit toolkit = (SunToolkit) Toolkit.getDefaultToolkit();
+
+        int flags = toolkit.checkImage(image, IMAGE_WIDTH, IMAGE_WIDTH, new SilentImageObserver());
+        if ((flags & (ImageObserver.FRAMEBITS | ImageObserver.ALLBITS)) == 0) {
+            throw new RuntimeException("Image is not loaded!");
+        }
+    }
+
+    static class SilentImageObserver implements ImageObserver {
+
+        @Override
+        public boolean imageUpdate(Image img, int infoflags, int x, int y, int width, int height) {
+            throw new RuntimeException("Observer should not be called!");
+        }
+    }
+
+    static class LoadImageObserver implements ImageObserver {
+
+        Image image;
+
+        public LoadImageObserver(Image image) {
+            this.image = image;
+        }
+
+        @Override
+        public boolean imageUpdate(Image img, int infoflags, int x, int y, int width, int height) {
+
+            if (image != img) {
+                throw new RuntimeException("Original image is not passed to the observer");
+            }
+
+            if ((infoflags & ImageObserver.WIDTH) != 0) {
+                if (width != IMAGE_WIDTH) {
+                    throw new RuntimeException("Original width is not passed to the observer");
+                }
+            }
+
+            if ((infoflags & ImageObserver.HEIGHT) != 0) {
+                if (height != IMAGE_HEIGHT) {
+                    throw new RuntimeException("Original height is not passed to the observer");
+                }
+            }
+
+            return (infoflags & ALLBITS) == 0;
+        }
+
+    }
+
+    static void testToolkitMultiResolutionImage() throws Exception {
+
+        generateImages();
+
+        File imageFile = new File(IMAGE_NAME_1X);
+        String fileName = imageFile.getAbsolutePath();
+        URL url = imageFile.toURI().toURL();
+        testToolkitMultiResolutionImageChache(fileName, url);
+
+        Image image = Toolkit.getDefaultToolkit().getImage(fileName);
+        testToolkitImageObserver(image);
+        testToolkitMultiResolutionImage(image, false);
+        testToolkitMultiResolutionImage(image, true);
+
+        image = Toolkit.getDefaultToolkit().getImage(url);
+        testToolkitImageObserver(image);
+        testToolkitMultiResolutionImage(image, false);
+        testToolkitMultiResolutionImage(image, true);
+    }
+
+    static void testToolkitMultiResolutionImageChache(String fileName, URL url) {
+
+        Image img1 = Toolkit.getDefaultToolkit().getImage(fileName);
+        if (!(img1 instanceof MultiResolutionImage)) {
+            throw new RuntimeException("Not a MultiResolutionImage");
+        }
+
+        Image img2 = Toolkit.getDefaultToolkit().getImage(fileName);
+        if (img1 != img2) {
+            throw new RuntimeException("Image is not cached");
+        }
+
+        img1 = Toolkit.getDefaultToolkit().getImage(url);
+        if (!(img1 instanceof MultiResolutionImage)) {
+            throw new RuntimeException("Not a MultiResolutionImage");
+        }
+
+        img2 = Toolkit.getDefaultToolkit().getImage(url);
+        if (img1 != img2) {
+            throw new RuntimeException("Image is not cached");
+        }
+    }
+
+    static void testToolkitMultiResolutionImage(Image image, boolean enableImageScaling)
+            throws Exception {
+
+        MediaTracker tracker = new MediaTracker(new JPanel());
+        tracker.addImage(image, 0);
+        tracker.waitForID(0);
+        if (tracker.isErrorAny()) {
+            throw new RuntimeException("Error during image loading");
+        }
+
+        final BufferedImage bufferedImage1x = new BufferedImage(IMAGE_WIDTH, IMAGE_HEIGHT,
+                BufferedImage.TYPE_INT_RGB);
+        Graphics2D g1x = (Graphics2D) bufferedImage1x.getGraphics();
+        setImageScalingHint(g1x, false);
+        g1x.drawImage(image, 0, 0, null);
+        checkColor(bufferedImage1x.getRGB(3 * IMAGE_WIDTH / 4, 3 * IMAGE_HEIGHT / 4), false);
+
+        Image resolutionVariant = ((MultiResolutionImage) image).
+                getResolutionVariant(2 * IMAGE_WIDTH, 2 * IMAGE_HEIGHT);
+
+        if (resolutionVariant == null) {
+            throw new RuntimeException("Resolution variant is null");
+        }
+
+        MediaTracker tracker2x = new MediaTracker(new JPanel());
+        tracker2x.addImage(resolutionVariant, 0);
+        tracker2x.waitForID(0);
+        if (tracker2x.isErrorAny()) {
+            throw new RuntimeException("Error during scalable image loading");
+        }
+
+        final BufferedImage bufferedImage2x = new BufferedImage(2 * IMAGE_WIDTH,
+                2 * IMAGE_HEIGHT, BufferedImage.TYPE_INT_RGB);
+        Graphics2D g2x = (Graphics2D) bufferedImage2x.getGraphics();
+        setImageScalingHint(g2x, enableImageScaling);
+        g2x.drawImage(image, 0, 0, 2 * IMAGE_WIDTH, 2 * IMAGE_HEIGHT, 0, 0, IMAGE_WIDTH, IMAGE_HEIGHT, null);
+        checkColor(bufferedImage2x.getRGB(3 * IMAGE_WIDTH / 2, 3 * IMAGE_HEIGHT / 2), enableImageScaling);
+
+        if (!(image instanceof MultiResolutionImage)) {
+            throw new RuntimeException("Not a MultiResolutionImage");
+        }
+
+        MultiResolutionImage multiResolutionImage = (MultiResolutionImage) image;
+
+        Image image1x = multiResolutionImage.getResolutionVariant(IMAGE_WIDTH, IMAGE_HEIGHT);
+        Image image2x = multiResolutionImage.getResolutionVariant(2 * IMAGE_WIDTH, 2 * IMAGE_HEIGHT);
+
+        if (image1x.getWidth(null) * 2 != image2x.getWidth(null)
+                || image1x.getHeight(null) * 2 != image2x.getHeight(null)) {
+            throw new RuntimeException("Wrong resolution variant size");
+        }
+    }
+
+    static void testToolkitImageObserver(final Image image) {
+
+        ImageObserver observer = new ImageObserver() {
+
+            @Override
+            public boolean imageUpdate(Image img, int infoflags, int x, int y, int width, int height) {
+
+                if (img != image) {
+                    throw new RuntimeException("Wrong image in observer");
+                }
+
+                if ((infoflags & (ImageObserver.ERROR | ImageObserver.ABORT)) != 0) {
+                    throw new RuntimeException("Error during image loading");
+                }
+
+                return (infoflags & ImageObserver.ALLBITS) == 0;
+
+            }
+        };
+
+        final BufferedImage bufferedImage2x = new BufferedImage(2 * IMAGE_WIDTH,
+                2 * IMAGE_HEIGHT, BufferedImage.TYPE_INT_RGB);
+        Graphics2D g2x = (Graphics2D) bufferedImage2x.getGraphics();
+        setImageScalingHint(g2x, true);
+
+        g2x.drawImage(image, 0, 0, 2 * IMAGE_WIDTH, 2 * IMAGE_HEIGHT, 0, 0, IMAGE_WIDTH, IMAGE_HEIGHT, observer);
+
+    }
+
+    static void setImageScalingHint(Graphics2D g2d, boolean enableImageScaling) {
+        g2d.setRenderingHint(SunHints.KEY_RESOLUTION_VARIANT, enableImageScaling
+                ? SunHints.VALUE_RESOLUTION_VARIANT_ON
+                : SunHints.VALUE_RESOLUTION_VARIANT_OFF);
+    }
+
+    static void checkColor(int rgb, boolean isImageScaled) {
+
+        if (!isImageScaled && COLOR_1X.getRGB() != rgb) {
+            throw new RuntimeException("Wrong 1x color: " + new Color(rgb));
+        }
+
+        if (isImageScaled && COLOR_2X.getRGB() != rgb) {
+            throw new RuntimeException("Wrong 2x color" + new Color(rgb));
+        }
+    }
+
+    static void generateImages() throws Exception {
+        if (!new File(IMAGE_NAME_1X).exists()) {
+            generateImage(1);
+        }
+
+        if (!new File(IMAGE_NAME_2X).exists()) {
+            generateImage(2);
+        }
+    }
+
+    static void generateImage(int scale) throws Exception {
+        BufferedImage image = new BufferedImage(scale * IMAGE_WIDTH, scale * IMAGE_HEIGHT,
+                BufferedImage.TYPE_INT_RGB);
+        Graphics g = image.getGraphics();
+        g.setColor(scale == 1 ? COLOR_1X : COLOR_2X);
+        g.fillRect(0, 0, scale * IMAGE_WIDTH, scale * IMAGE_HEIGHT);
+        File file = new File(scale == 1 ? IMAGE_NAME_1X : IMAGE_NAME_2X);
+        ImageIO.write(image, "png", file);
+    }
+
+    static void testImageNameTo2xParsing() throws Exception {
+
+        for (String[] testNames : TEST_FILE_NAMES) {
+            String testName = testNames[0];
+            String goldenName = testNames[1];
+            String resultName = getTestScaledImageName(testName);
+
+            if (!isValidPath(testName) && resultName == null) {
+                continue;
+            }
+
+            if (goldenName.equals(resultName)) {
+                continue;
+            }
+
+            throw new RuntimeException("Test name " + testName
+                    + ", result name: " + resultName);
+        }
+
+        for (URL[] testURLs : TEST_URLS) {
+            URL testURL = testURLs[0];
+            URL goldenURL = testURLs[1];
+            URL resultURL = getTestScaledImageURL(testURL);
+
+            if (!isValidPath(testURL.getPath()) && resultURL == null) {
+                continue;
+            }
+
+            if (goldenURL.equals(resultURL)) {
+                continue;
+            }
+
+            throw new RuntimeException("Test url: " + testURL
+                    + ", result url: " + resultURL);
+        }
+
+    }
+
+    static URL getTestScaledImageURL(URL url) throws Exception {
+        Method method = getScalableImageMethod("getScaledImageURL", URL.class);
+        return (URL) method.invoke(null, url);
+    }
+
+    static String getTestScaledImageName(String name) throws Exception {
+        Method method = getScalableImageMethod("getScaledImageName", String.class);
+        return (String) method.invoke(null, name);
+    }
+
+    private static boolean isValidPath(String path) {
+        return !path.isEmpty() && !path.endsWith("/") && !path.endsWith(".")
+                && !path.contains("@2x");
+    }
+
+    private static Method getScalableImageMethod(String name,
+            Class... parameterTypes) throws Exception {
+        Toolkit toolkit = Toolkit.getDefaultToolkit();
+        Method method = toolkit.getClass().getDeclaredMethod(name, parameterTypes);
+        method.setAccessible(true);
+        return method;
+    }
+    private static final String[][] TEST_FILE_NAMES;
+    private static final URL[][] TEST_URLS;
+
+    static {
+        TEST_FILE_NAMES = new String[][]{
+            {"", null},
+            {".", null},
+            {"..", null},
+            {"/", null},
+            {"/.", null},
+            {"dir/", null},
+            {"dir/.", null},
+            {"aaa@2x.png", null},
+            {"/dir/aaa@2x.png", null},
+            {"image", "image@2x"},
+            {"image.ext", "image@2x.ext"},
+            {"image.aaa.ext", "image.aaa@2x.ext"},
+            {"dir/image", "dir/image@2x"},
+            {"dir/image.ext", "dir/image@2x.ext"},
+            {"dir/image.aaa.ext", "dir/image.aaa@2x.ext"},
+            {"dir/aaa.bbb/image", "dir/aaa.bbb/image@2x"},
+            {"dir/aaa.bbb/image.ext", "dir/aaa.bbb/image@2x.ext"},
+            {"dir/aaa.bbb/image.ccc.ext", "dir/aaa.bbb/image.ccc@2x.ext"},
+            {"/dir/image", "/dir/image@2x"},
+            {"/dir/image.ext", "/dir/image@2x.ext"},
+            {"/dir/image.aaa.ext", "/dir/image.aaa@2x.ext"},
+            {"/dir/aaa.bbb/image", "/dir/aaa.bbb/image@2x"},
+            {"/dir/aaa.bbb/image.ext", "/dir/aaa.bbb/image@2x.ext"},
+            {"/dir/aaa.bbb/image.ccc.ext", "/dir/aaa.bbb/image.ccc@2x.ext"}
+        };
+        try {
+            TEST_URLS = new URL[][]{
+                // file
+                {new URL("file:/aaa"), new URL("file:/aaa@2x")},
+                {new URL("file:/aaa.ext"), new URL("file:/aaa@2x.ext")},
+                {new URL("file:/aaa.bbb.ext"), new URL("file:/aaa.bbb@2x.ext")},
+                {new URL("file:/ccc/aaa.bbb.ext"),
+                    new URL("file:/ccc/aaa.bbb@2x.ext")},
+                {new URL("file:/ccc.ddd/aaa.bbb.ext"),
+                    new URL("file:/ccc.ddd/aaa.bbb@2x.ext")},
+                {new URL("file:///~/image"), new URL("file:///~/image@2x")},
+                {new URL("file:///~/image.ext"),
+                    new URL("file:///~/image@2x.ext")},
+                // http
+                {new URL("http://www.test.com"), null},
+                {new URL("http://www.test.com/"), null},
+                {new URL("http://www.test.com///"), null},
+                {new URL("http://www.test.com/image"),
+                    new URL("http://www.test.com/image@2x")},
+                {new URL("http://www.test.com/image.ext"),
+                    new URL("http://www.test.com/image@2x.ext")},
+                {new URL("http://www.test.com/dir/image"),
+                    new URL("http://www.test.com/dir/image@2x")},
+                {new URL("http://www.test.com:80/dir/image.aaa.ext"),
+                    new URL("http://www.test.com:80/dir/image.aaa@2x.ext")},
+                {new URL("http://www.test.com:8080/dir/image.aaa.ext"),
+                    new URL("http://www.test.com:8080/dir/image.aaa@2x.ext")},
+                // jar
+                {new URL("jar:file:/dir/Java2D.jar!/image"),
+                    new URL("jar:file:/dir/Java2D.jar!/image@2x")},
+                {new URL("jar:file:/dir/Java2D.jar!/image.aaa.ext"),
+                    new URL("jar:file:/dir/Java2D.jar!/image.aaa@2x.ext")},
+                {new URL("jar:file:/dir/Java2D.jar!/images/image"),
+                    new URL("jar:file:/dir/Java2D.jar!/images/image@2x")},
+                {new URL("jar:file:/dir/Java2D.jar!/images/image.ext"),
+                    new URL("jar:file:/dir/Java2D.jar!/images/image@2x.ext")},
+                {new URL("jar:file:/aaa.bbb/Java2D.jar!/images/image.ext"),
+                    new URL("jar:file:/aaa.bbb/Java2D.jar!/images/image@2x.ext")},
+                {new URL("jar:file:/dir/Java2D.jar!/aaa.bbb/image.ext"),
+                    new URL("jar:file:/dir/Java2D.jar!/aaa.bbb/image@2x.ext")},};
+        } catch (Exception e) {
+            throw new RuntimeException(e);
+        }
+    }
+
+    static class PreloadedImageObserver implements ImageObserver {
+
+        @Override
+        public boolean imageUpdate(Image img, int infoflags, int x, int y, int width, int height) {
+            throw new RuntimeException("Image should be already preloaded");
+        }
+    }
+}