test/java/awt/image/ConvolveOp/OpCompatibleImageTest.java

/*
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 * 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.
 *
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 * questions.
 */

/*
 * @test
 * @bug     6585922
 * @summary Test verifies ConvolveOp creates compatible destination images
 *          of same type and this pair {src, dst} can be handled by the
 *          ConvolveOp filter.
 *
 * @run     main OpCompatibleImageTest
 */

import java.awt.Color;
import java.awt.Graphics;
import java.awt.image.BufferedImage;
import java.awt.image.BufferedImageOp;
import java.awt.image.ColorModel;
import java.awt.image.ConvolveOp;
import java.awt.image.ImagingOpException;
import java.awt.image.Kernel;

public class OpCompatibleImageTest {

    public static void main(String[] args) {
        OpCompatibleImageTest t = new OpCompatibleImageTest();
        t.doTest(BufferedImage.TYPE_3BYTE_BGR);
        t.doTest(BufferedImage.TYPE_4BYTE_ABGR);
        t.doTest(BufferedImage.TYPE_BYTE_GRAY);
        t.doTest(BufferedImage.TYPE_INT_ARGB);
        t.doTest(BufferedImage.TYPE_INT_BGR);
        t.doTest(BufferedImage.TYPE_INT_RGB);
        t.doTest(BufferedImage.TYPE_BYTE_INDEXED);
    }

    private BufferedImageOp op;

    public OpCompatibleImageTest() {
        final Kernel kernel = new Kernel(3, 3,
                new float[] {
            1f/9f, 1f/9f, 1f/9f,
            1f/9f, 1f/9f, 1f/9f,
            1f/9f, 1f/9f, 1f/9f});
        op = new ConvolveOp(kernel);
    }

    public void doTest(int type) {
        System.out.println("Test for type " + describeType(type));

        BufferedImage src = createTestImage(type);

        BufferedImage res = null;

        System.out.println("Testing null destination...");
        try {
            res = op.filter(src, null);
        } catch (ImagingOpException e) {
            throw new RuntimeException("Test FAILED!", e);
        }

        if (res == null ||
            ((src.getType() != BufferedImage.TYPE_BYTE_INDEXED) &&
             (res.getType() != src.getType())))
        {
            throw new RuntimeException("Test FAILED!");
        }
        System.out.println("Test PASSED.");
    }

    private BufferedImage createCompatible(ColorModel cm, int w, int h) {
        return new BufferedImage (cm,
                                  cm.createCompatibleWritableRaster(w, h),
                                  cm.isAlphaPremultiplied(), null);
    }

    private BufferedImage createTestImage(int type) {
        BufferedImage img = new BufferedImage(100, 100, type);
        Graphics g = img.createGraphics();
        g.setColor(Color.red);
        g.fillRect(0, 0, 100, 100);
        g.dispose();

        return img;
    }

    private static String describeType(int type) {
        switch(type) {
        case BufferedImage.TYPE_3BYTE_BGR:
            return "TYPE_3BYTE_BGR";
        case BufferedImage.TYPE_4BYTE_ABGR:
            return "TYPE_4BYTE_ABGR";
        case BufferedImage.TYPE_BYTE_GRAY:
            return "TYPE_BYTE_GRAY";
        case BufferedImage.TYPE_INT_ARGB:
            return "TYPE_INT_ARGB";
        case BufferedImage.TYPE_INT_BGR:
            return  "TYPE_INT_BGR";
        case BufferedImage.TYPE_INT_RGB:
            return "TYPE_INT_RGB";
        case BufferedImage.TYPE_BYTE_INDEXED:
            return "TYPE_BYTE_INDEXED";
        default:
            throw new RuntimeException("Test FAILED: unknown type " + type);
        }
    }
}