OSXLigatureTest.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).
 *
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 * 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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/*
 * @test
 * @bug 7162125
 * @summary Test ligatures form on OS X.
 */

import java.awt.Color;
import java.awt.Font;
import java.awt.Graphics2D;
import java.awt.image.BufferedImage;
import java.awt.font.TextAttribute;
import java.util.HashMap;
import java.util.Map;

public class OSXLigatureTest {

    public static void main(String[] args) {
        if (!System.getProperty("os.name").startsWith("Mac")) {
            return;
        }
        String ligStr = "ffi";
        int w = 50, h = 50;

        BufferedImage bi1 = new BufferedImage(w, h, BufferedImage.TYPE_INT_RGB);
        Graphics2D bi1Graphics = bi1.createGraphics();
        bi1Graphics.setColor(Color.white);
        bi1Graphics.fillRect(0, 0, w, h);
        bi1Graphics.setColor(Color.black);
        Font noLigFont = new Font("Gill Sans", Font.PLAIN, 30);
        bi1Graphics.setFont(noLigFont);
        bi1Graphics.drawString(ligStr, 10, 40);

        BufferedImage bi2 = new BufferedImage(w, h, BufferedImage.TYPE_INT_RGB);
        Graphics2D bi2Graphics = bi2.createGraphics();
        bi2Graphics.setColor(Color.white);
        bi2Graphics.fillRect(0, 0, w, h);
        bi2Graphics.setColor(Color.black);
        Map<TextAttribute, Object> attributes = new HashMap<>();
        attributes.put(TextAttribute.LIGATURES, TextAttribute.LIGATURES_ON);
        Font ligFont = noLigFont.deriveFont(attributes);
        bi2Graphics.setFont(ligFont);
        bi2Graphics.drawString(ligStr, 10, 40);

        boolean same = true;
        for (int x = 0; x < w; x++) {
            for (int y = 0; y < h; y++) {
                int c1 = bi1.getRGB(x, y);
                int c2 = bi2.getRGB(x, y);
                same &= (c1 == c2);
            }
            if (!same) {
               break;
            }
        }
        if (same) {
            throw new RuntimeException("Images do not differ - no ligature");
        }
    }
}