test/jdk/java/awt/font/Outline/OutlineInvarianceTest.java

/*
 * Copyright (c) 2005, 2018, 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
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 * questions.
 */

/*
 * @test
 * @bug 5027379 8154463
 * @summary This test verifies that outlines are the same for AA and B&W text
 */


import java.awt.*;
import java.awt.font.*;
import java.awt.geom.*;
import java.awt.image.*;

public class OutlineInvarianceTest {

    private static Shape getOutline(Font font, String str, boolean isAA) {
        BufferedImage img = new BufferedImage(400, 400, BufferedImage.TYPE_INT_ARGB);

        Graphics2D gc = (Graphics2D) img.getGraphics();

        if (isAA) {
            gc.setRenderingHint(RenderingHints.KEY_TEXT_ANTIALIASING, RenderingHints.VALUE_TEXT_ANTIALIAS_ON);
        } else {
            gc.setRenderingHint(RenderingHints.KEY_TEXT_ANTIALIASING, RenderingHints.VALUE_TEXT_ANTIALIAS_OFF);
        }

        FontRenderContext frc = gc.getFontRenderContext();
        GlyphVector gv;
        gv = font.layoutGlyphVector(frc, str.toCharArray(), 0, str.length(), 0);

        return gv.getOutline();
    }

   private static boolean compareShapes(Shape s1, Shape s2) {
       if (s1 == null || s2 == null)
           return false;

       PathIterator p1 = s1.getPathIterator(null);
       float coords1[] = {0f, 0f, 0f, 0f, 0f, 0f};

       PathIterator p2 = s2.getPathIterator(null);
       float coords2[] = {0f, 0f, 0f, 0f, 0f, 0f};

       while (!p1.isDone() || !p2.isDone()) {
           if (p1.currentSegment(coords1) != p2.currentSegment(coords2)) {
               System.err.println("Types of segment are different");
               return false;
           }

           for (int i=0; i<6; i++)
               if (coords1[i] != coords2[i]) {
                   System.err.println("Coordinate "+i+" are different");
                   return false;
               }

           p1.next();
           p2.next();
      }

      if (!(p1.isDone() && p2.isDone())) {
          System.err.println("Length of paths are different");
      }

      return (p1.isDone() && p2.isDone());
   }

   private static void testFont(String family, float sz, String testStr) throws Exception {
       Font f = new Font(family, Font.PLAIN, 1);

       for(int style=1; style<4; style++) {
           f = f.deriveFont(Font.BOLD, sz);

           Shape s1 = getOutline(f, testStr, false);
           Shape s2 = getOutline(f, testStr, true);

           if (!compareShapes(s1, s2))
               throw new Exception("Failed for font " + f);
       }
   }

   public static void main(String[] arg) throws Exception {
       String testStr = "0123456789";

       testFont("MS Gothic", 30.0f, testStr);
       testFont("MS Gothic", 12.0f, testStr);
       testFont("MS Gothic",  7.0f, testStr);
   }
}