8000176: Need automated test for checking scale quality

Reviewed-by: prr, bae
Contributed-by: NVadim Pakhnushev <vadim.pakhnushev@oracle.com>

test/sun/java2d/pipe/InterpolationQualityTest.java

+/*
+ * Copyright (c) 2012, 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 7188093 8000176
+ * @summary Tests each of the 3 possible methods for rendering an upscaled
+ * image via rendering hints for default, xrender and opengl pipelines.
+ *
+ * @author Vadim.Pakhnushev@oracle.com
+ * @run main/othervm -Dsun.java2d.xrender=false InterpolationQualityTest
+ * @run main/othervm -Dsun.java2d.xrender=True InterpolationQualityTest
+ * @run main/othervm -Dsun.java2d.opengl=True InterpolationQualityTest
+ * @run main/othervm -Dsun.java2d.d3d=false InterpolationQualityTest
+ * @run main/othervm -Dsun.java2d.d3d=True InterpolationQualityTest
+ */
+
+import java.awt.*;
+import java.awt.image.*;
+import java.io.File;
+import java.io.IOException;
+import javax.imageio.ImageIO;
+
+public class InterpolationQualityTest {
+
+    private static final int testSize = 4, scaleFactor = 20, tolerance = 3;
+    private static final int sw = testSize * scaleFactor;
+    private static final int sh = testSize * scaleFactor;
+
+    private Image testImage;
+    private VolatileImage vImg;
+
+    public InterpolationQualityTest() {
+        testImage = createTestImage();
+    }
+
+    private Image createTestImage() {
+        BufferedImage bi = new BufferedImage(testSize, testSize, BufferedImage.TYPE_INT_ARGB);
+        Graphics2D g = bi.createGraphics();
+        g.setColor(Color.BLACK);
+        g.fillRect(0, 0, testSize, testSize);
+        for (int i = 0; i < testSize; i++) {
+            bi.setRGB(i, i, Color.WHITE.getRGB());
+        }
+        return bi;
+    }
+
+    private BufferedImage createReferenceImage(Object hint) {
+        BufferedImage bi = new BufferedImage(sw, sh, BufferedImage.TYPE_INT_ARGB);
+        Graphics2D g2d = bi.createGraphics();
+        drawImage(g2d, hint);
+        return bi;
+    }
+
+    private void drawImage(Graphics2D g2d, Object hint) {
+        g2d.setRenderingHint(RenderingHints.KEY_INTERPOLATION, hint);
+        g2d.drawImage(testImage, 0, 0, sw, sh, null);
+    }
+
+    private GraphicsConfiguration getDefaultGC() {
+        return GraphicsEnvironment.getLocalGraphicsEnvironment().
+                getDefaultScreenDevice().getDefaultConfiguration();
+    }
+
+    private void createVImg() {
+        vImg = getDefaultGC().createCompatibleVolatileImage(sw, sh);
+    }
+
+    private void renderOffscreen(Object hint) {
+        Graphics2D g = vImg.createGraphics();
+        drawImage(g, hint);
+        g.dispose();
+    }
+
+    private BufferedImage renderImage(Object hint) {
+        BufferedImage snapshot;
+        createVImg();
+        renderOffscreen(hint);
+
+        do {
+            int status = vImg.validate(getDefaultGC());
+            if (status != VolatileImage.IMAGE_OK) {
+                if (status == VolatileImage.IMAGE_INCOMPATIBLE) {
+                    createVImg();
+                }
+                renderOffscreen(hint);
+            }
+            snapshot = vImg.getSnapshot();
+        } while (vImg.contentsLost());
+        vImg.flush();
+        return snapshot;
+    }
+
+    private boolean compareComponent(int comp1, int comp2) {
+        return Math.abs(comp1 - comp2) <= tolerance;
+    }
+
+    private boolean compareRGB(int rgb1, int rgb2) {
+        Color col1 = new Color(rgb1);
+        Color col2 = new Color(rgb2);
+        return compareComponent(col1.getRed(), col2.getRed()) &&
+                compareComponent(col1.getBlue(), col2.getBlue()) &&
+                compareComponent(col1.getGreen(), col2.getGreen()) &&
+                compareComponent(col1.getAlpha(), col2.getAlpha());
+    }
+
+    private boolean compareImages(BufferedImage img, BufferedImage ref, String imgName) {
+        for (int y = 0; y < ref.getHeight(); y++) {
+            for (int x = 0; x < ref.getWidth(); x++) {
+                if (!compareRGB(ref.getRGB(x, y), img.getRGB(x, y))) {
+                    System.out.println(imgName + ".getRGB(" + x + ", " + y + ") = "
+                            + new Color(img.getRGB(x, y)) + " != "
+                            + new Color(ref.getRGB(x, y)));
+                    return false;
+                }
+            }
+        }
+        return true;
+    }
+
+    private boolean test(Object hint) {
+        BufferedImage refImage = createReferenceImage(hint);
+        BufferedImage resImage = renderImage(hint);
+
+        boolean passed = compareImages(resImage, refImage, "resImage");
+        System.out.println(getHintName(hint) + (passed ? " passed." : " failed."));
+        if (!passed) {
+            dumpImage(refImage, "out_" + getHintName(hint) + "_ref.png");
+            dumpImage(resImage, "out_" + getHintName(hint) + ".png");
+        }
+        return passed;
+    }
+
+    public void test() {
+        boolean passed = true;
+        passed &= test(RenderingHints.VALUE_INTERPOLATION_NEAREST_NEIGHBOR);
+        passed &= test(RenderingHints.VALUE_INTERPOLATION_BILINEAR);
+        passed &= test(RenderingHints.VALUE_INTERPOLATION_BICUBIC);
+        if (passed) {
+            System.out.println("Test PASSED.");
+        } else {
+            throw new RuntimeException("Test FAILED.");
+        }
+    }
+
+    private String getHintName(Object hint) {
+        if (hint == RenderingHints.VALUE_INTERPOLATION_NEAREST_NEIGHBOR) {
+            return "nearest";
+        }
+        else if (hint == RenderingHints.VALUE_INTERPOLATION_BILINEAR) {
+            return "bilinear";
+        }
+        else if (hint == RenderingHints.VALUE_INTERPOLATION_BICUBIC) {
+            return "bicubic";
+        }
+        else {
+            return "null";
+        }
+    }
+
+    private void dumpImage(BufferedImage bi, String name) {
+        try {
+            ImageIO.write(bi, "PNG", new File(name));
+        } catch (IOException ex) {
+        }
+    }
+
+    public static void main(String[] argv) {
+        InterpolationQualityTest test = new InterpolationQualityTest();
+        test.test();
+    }
+}