1 /*

     2  * Copyright (c) 2019, Oracle and/or its affiliates. All rights reserved.

     3  * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.

     4  *

     5  * This code is free software; you can redistribute it and/or modify it

     6  * under the terms of the GNU General Public License version 2 only, as

     7  * published by the Free Software Foundation.

     8  *

     9  * This code is distributed in the hope that it will be useful, but WITHOUT

    10  * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or

    11  * FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License

    12  * version 2 for more details (a copy is included in the LICENSE file that

    13  * accompanied this code).

    14  *

    15  * You should have received a copy of the GNU General Public License version

    16  * 2 along with this work; if not, write to the Free Software Foundation,

    17  * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.

    18  *

    19  * Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA

    20  * or visit www.oracle.com if you need additional information or have any

    21  * questions.

    22  */

    23 

    24 

    25 import java.awt.BasicStroke;

    26 import java.awt.Color;

    27 import java.awt.Graphics2D;

    28 import java.awt.Rectangle;

    29 import java.awt.RenderingHints;

    30 import java.awt.geom.AffineTransform;

    31 import java.awt.geom.Ellipse2D;

    32 import java.awt.image.BufferedImage;

    33 import java.io.File;

    34 import java.io.IOException;

    35 import javax.imageio.ImageIO;

    36 

    37 

    38 /**

    39  * Tests calculating user space line with a negative determinant (flip).

    40  *

    41  * @test

    42  * @summary verify that flipped transformed lines are properly rasterized

    43  * @bug 8230728

    44  */

    45 public class FlipBitTest {

    46 

    47     static final boolean SAVE_IMAGE = false;

    48 

    49     public static void main(final String[] args) {

    50 

    51         final int size = 100;

    52 

    53         // First display which renderer is tested:

    54         // JDK9 only:

    55         System.setProperty("sun.java2d.renderer.verbose", "true");

    56 

    57         System.out.println("FlipBitTest: size = " + size);

    58 

    59         final BufferedImage image = new BufferedImage(size, size, BufferedImage.TYPE_INT_ARGB);

    60 

    61         final Graphics2D g2d = (Graphics2D) image.getGraphics();

    62         try {

    63             g2d.setRenderingHint(RenderingHints.KEY_ANTIALIASING, RenderingHints.VALUE_ANTIALIAS_ON);

    64             g2d.setRenderingHint(RenderingHints.KEY_RENDERING, RenderingHints.VALUE_RENDER_QUALITY);

    65             g2d.setRenderingHint(RenderingHints.KEY_STROKE_CONTROL, RenderingHints.VALUE_STROKE_NORMALIZE);

    66 

    67             final AffineTransform at = new AffineTransform();

    68             at.setToScale(1, -1.01);

    69             g2d.setTransform(at);

    70 

    71             g2d.translate(0, -image.getHeight());

    72             g2d.setPaint(Color.WHITE);

    73             g2d.fill(new Rectangle(image.getWidth(), image.getHeight()));

    74 

    75             g2d.setPaint(Color.BLACK);

    76             g2d.setStroke(new BasicStroke(0.1f));

    77             g2d.draw(new Ellipse2D.Double(25, 25, 50, 50));

    78 

    79             if (SAVE_IMAGE) {

    80                 try {

    81                     final File file = new File("FlipBitTest.png");

    82 

    83                     System.out.println("Writing file: " + file.getAbsolutePath());

    84                     ImageIO.write(image, "PNG", file);

    85                 } catch (IOException ex) {

    86                     ex.printStackTrace();

    87                 }

    88             }

    89 

    90             boolean nonWhitePixelFound = false;

    91             for (int x = 0; x < image.getWidth(); ++x) {

    92                 if (image.getRGB(x, 50) != Color.WHITE.getRGB()) {

    93                     nonWhitePixelFound = true;

    94                     break;

    95                 }

    96             }

    97             if (!nonWhitePixelFound) {

    98                 throw new IllegalStateException("The ellipse was not drawn");

    99             }

   100         } finally {

   101             g2d.dispose();

   102         }

   103     }

   104 }