Java example source code file (InterpolationQualityTest.java)

This example Java source code file (InterpolationQualityTest.java) is included in the alvinalexander.com "Java Source Code Warehouse" project. The intent of this project is to help you "Learn Java by Example" ^TM.

Learn more about this Java project at its project page.

Java - Java tags/keywords

awt, bufferedimage, color, failed, file, graphics2d, graphicsconfiguration, image, imageio, interpolationqualitytest, ioexception, object, png, runtimeexception, string, volatileimage

The InterpolationQualityTest.java Java example source code

/*
 * 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();
    }
}