test/jdk/java/awt/BasicStroke/DashOffset.java - platform/libcore - Git at Google

 /*
  * Copyright (c) 2001, 2019, 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.
  */

 import java.awt.BasicStroke;
 import java.awt.Color;
 import java.awt.Graphics;
 import java.awt.Graphics2D;
 import java.awt.GraphicsConfiguration;
 import java.awt.GraphicsEnvironment;
 import java.awt.Image;
 import java.awt.image.BufferedImage;
 import java.awt.image.IndexColorModel;
 import java.awt.image.VolatileImage;
 import java.io.File;
 import java.io.IOException;
 import java.util.Arrays;
 import java.util.stream.Collectors;
 import javax.imageio.ImageIO;

 import static java.awt.image.BufferedImage.TYPE_INT_RGB;

 /*
  * @test
  * @bug 4469881 8217263 8218682
  * @key headful
  * @summary Verifies that dashed rectangles drawn to the screen line
  *          up with their undashed counterparts
  * @author flar
  * @run main/othervm -Dsun.java2d.uiScale=1 DashOffset
  */
 public class DashOffset {

     private static final BasicStroke dash =
             new BasicStroke(1.0f, BasicStroke.CAP_BUTT,
                             BasicStroke.JOIN_MITER, 10.0f,
                             new float[] {2.0f, 2.0f}, 0.0f);

     private static final Color COLOR1 = Color.BLUE;
     private static final Color COLOR2 = Color.GREEN;

     private static final Color BACKGROUND = Color.WHITE;

     private static final int WIDTH = 20;
     private static final int HEIGHT = 20;

     private static final int OFFSET = 2;

     private static final int MAX_DASH_LENGTH = 3;

     public static void main(String[] argv) throws Exception {
         final boolean saveImage = argv.length > 0 && "-save".equals(argv[0]);

         final BufferedImage img = new BufferedImage(WIDTH, HEIGHT,
                                                     TYPE_INT_RGB);
         try {
             draw(img);
             validate(img);
         } finally {
             if (saveImage) {
                 save(img, "bufferedImage.png");
             }
         }

         BufferedImage snapshot = null;
         try {
             final GraphicsConfiguration gc =
                     GraphicsEnvironment.getLocalGraphicsEnvironment()
                                        .getDefaultScreenDevice()
                                        .getDefaultConfiguration();
             if (gc.getColorModel() instanceof IndexColorModel) {
                 System.err.println("Skipping VolatileImage because of IndexColorModel");
                 return;
             }

             VolatileImage vi = gc.createCompatibleVolatileImage(WIDTH, HEIGHT);
             int attempt = 0;
             do {
                 vi.validate(gc);
                 draw(vi);
                 snapshot = vi.getSnapshot();
             } while (vi.contentsLost() && ++attempt <= 10);
             if (attempt > 10) {
                 throw new RuntimeException("Too many attempts: " + attempt);
             }
             validate(snapshot);
         } finally {
             if (saveImage && snapshot != null) {
                 save(snapshot, "volatileImage.png");
             }
         }
     }

     private static void draw(final Image img) {
         Graphics g = img.getGraphics();
         g.setColor(BACKGROUND);
         g.fillRect(0, 0, WIDTH, HEIGHT);
         g.setColor(COLOR1);
         g.drawRect(OFFSET, OFFSET, WIDTH - OFFSET * 2, HEIGHT - OFFSET * 2);
         g.setColor(COLOR2);
         g.clipRect(OFFSET, OFFSET, WIDTH - OFFSET * 2 + 1, HEIGHT - OFFSET * 2 + 1);
         ((Graphics2D) g).setStroke(dash);
         g.drawRect(OFFSET, OFFSET, WIDTH - OFFSET * 2, HEIGHT - OFFSET * 2);
         g.dispose();
     }

     private static void validate(final BufferedImage img) {
         checkHorizontalLine(img, OFFSET);
         checkHorizontalLine(img, HEIGHT - OFFSET);
         checkVerticalLine(img, OFFSET);
         checkVerticalLine(img, WIDTH - OFFSET);
         checkCorners(img);
     }

     private static void checkHorizontalLine(final BufferedImage img,
                                             final int y) {
         int prev = img.getRGB(OFFSET, y);
         int curr;
         int count = 1;
         checkColor(OFFSET, y, prev, COLOR1, COLOR2);
         for (int x = OFFSET + 1; x <= WIDTH - OFFSET; x++) {
             curr = img.getRGB(x, y);
             if (curr != prev) {
                 checkColor(x, y, curr, COLOR1, COLOR2);
                 checkCount(x, y, count);
                 prev = curr;
                 count = 1;
             } else {
                 count++;
             }
             if (x < WIDTH - OFFSET) {
                 checkColor(x, y - 1, img.getRGB(x, y - 1), BACKGROUND);
                 checkColor(x, y + 1, img.getRGB(x, y + 1), BACKGROUND);
             }
         }
         checkCount(WIDTH - OFFSET, y, count);
     }

     private static void checkVerticalLine(final BufferedImage img,
                                           final int x) {
         int prev = img.getRGB(x, OFFSET);
         checkColor(x, OFFSET, prev, COLOR1, COLOR2);
         int count = 1;
         for (int y = OFFSET + 1; y <= HEIGHT - OFFSET; y++) {
             int curr = img.getRGB(x, y);
             if (curr != prev) {
                 checkColor(x, y, curr, COLOR1, COLOR2);
                 checkCount(x, y, count);
                 prev = curr;
                 count = 1;
             } else {
                 count++;
             }
             if (y < HEIGHT - OFFSET) {
                 checkColor(x - 1, y, img.getRGB(x - 1, y), BACKGROUND);
                 checkColor(x + 1, y, img.getRGB(x + 1, y), BACKGROUND);
             }
         }
         checkCount(x, HEIGHT - OFFSET, count);
     }

     private static void checkCorners(final BufferedImage img) {
         int[][] corners = {
                 {OFFSET - 1, OFFSET - 1},
                 {OFFSET,     OFFSET - 1},
                 {OFFSET - 1, OFFSET + 1},

                 {OFFSET - 1, HEIGHT - OFFSET},
                 {OFFSET - 1, HEIGHT - OFFSET + 1},
                 {OFFSET,     HEIGHT - OFFSET + 1},

                 {WIDTH - OFFSET,     OFFSET - 1},
                 {WIDTH - OFFSET + 1, OFFSET - 1},
                 {WIDTH - OFFSET + 1, OFFSET},

                 {WIDTH - OFFSET + 1, HEIGHT - OFFSET},
                 {WIDTH - OFFSET + 1, HEIGHT - OFFSET + 1},
                 {WIDTH - OFFSET,     HEIGHT - OFFSET + 1},
         };

         for (int[] corner : corners) {
             int color = img.getRGB(corner[0], corner[1]);
             checkColor(corner[0], corner[1], color, BACKGROUND);
         }
     }

     private static void checkColor(final int x, final int y,
                                    final int color,
                                    final Color... validColors) {
         checkColor(x, y, color, Arrays.stream(validColors)
                                       .mapToInt(Color::getRGB)
                                       .toArray());
     }

     private static void checkColor(final int x, final int y,
                                    final int color,
                                    final int... validColors) {
         for (int valid : validColors) {
             if (color == valid) {
                 return;
             }
         }
         throw new RuntimeException("Unexpected color at " + x + ", " + y
                 + ": " + Integer.toHexString(color) + "; expected: "
                 + Arrays.stream(validColors)
                         .mapToObj(Integer::toHexString)
                         .collect(Collectors.joining(", ")));
     }

     private static void checkCount(final int x, final int y, final int count) {
         if (count > MAX_DASH_LENGTH) {
             throw new RuntimeException("Dash is longer than " + MAX_DASH_LENGTH
                     + " at " + x + ", " + y);
         }
     }

     private static void save(final BufferedImage img,
                              final String fileName) throws IOException {
         ImageIO.write(img, "png", new File(fileName));
     }

 }
	/*
	* Copyright (c) 2001, 2019, 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.
	*/

	import java.awt.BasicStroke;
	import java.awt.Color;
	import java.awt.Graphics;
	import java.awt.Graphics2D;
	import java.awt.GraphicsConfiguration;
	import java.awt.GraphicsEnvironment;
	import java.awt.Image;
	import java.awt.image.BufferedImage;
	import java.awt.image.IndexColorModel;
	import java.awt.image.VolatileImage;
	import java.io.File;
	import java.io.IOException;
	import java.util.Arrays;
	import java.util.stream.Collectors;
	import javax.imageio.ImageIO;

	import static java.awt.image.BufferedImage.TYPE_INT_RGB;

	/*
	* @test
	* @bug 4469881 8217263 8218682
	* @key headful
	* @summary Verifies that dashed rectangles drawn to the screen line
	* up with their undashed counterparts
	* @author flar
	* @run main/othervm -Dsun.java2d.uiScale=1 DashOffset
	*/
	public class DashOffset {

	private static final BasicStroke dash =
	new BasicStroke(1.0f, BasicStroke.CAP_BUTT,
	BasicStroke.JOIN_MITER, 10.0f,
	new float[] {2.0f, 2.0f}, 0.0f);

	private static final Color COLOR1 = Color.BLUE;
	private static final Color COLOR2 = Color.GREEN;

	private static final Color BACKGROUND = Color.WHITE;

	private static final int WIDTH = 20;
	private static final int HEIGHT = 20;

	private static final int OFFSET = 2;

	private static final int MAX_DASH_LENGTH = 3;

	public static void main(String[] argv) throws Exception {
	final boolean saveImage = argv.length > 0 && "-save".equals(argv[0]);

	final BufferedImage img = new BufferedImage(WIDTH, HEIGHT,
	TYPE_INT_RGB);
	try {
	draw(img);
	validate(img);
	} finally {
	if (saveImage) {
	save(img, "bufferedImage.png");
	}
	}

	BufferedImage snapshot = null;
	try {
	final GraphicsConfiguration gc =
	GraphicsEnvironment.getLocalGraphicsEnvironment()
	.getDefaultScreenDevice()
	.getDefaultConfiguration();
	if (gc.getColorModel() instanceof IndexColorModel) {
	System.err.println("Skipping VolatileImage because of IndexColorModel");
	return;
	}

	VolatileImage vi = gc.createCompatibleVolatileImage(WIDTH, HEIGHT);
	int attempt = 0;
	do {
	vi.validate(gc);
	draw(vi);
	snapshot = vi.getSnapshot();
	} while (vi.contentsLost() && ++attempt <= 10);
	if (attempt > 10) {
	throw new RuntimeException("Too many attempts: " + attempt);
	}
	validate(snapshot);
	} finally {
	if (saveImage && snapshot != null) {
	save(snapshot, "volatileImage.png");
	}
	}
	}

	private static void draw(final Image img) {
	Graphics g = img.getGraphics();
	g.setColor(BACKGROUND);
	g.fillRect(0, 0, WIDTH, HEIGHT);
	g.setColor(COLOR1);
	g.drawRect(OFFSET, OFFSET, WIDTH - OFFSET * 2, HEIGHT - OFFSET * 2);
	g.setColor(COLOR2);
	g.clipRect(OFFSET, OFFSET, WIDTH - OFFSET * 2 + 1, HEIGHT - OFFSET * 2 + 1);
	((Graphics2D) g).setStroke(dash);
	g.drawRect(OFFSET, OFFSET, WIDTH - OFFSET * 2, HEIGHT - OFFSET * 2);
	g.dispose();
	}

	private static void validate(final BufferedImage img) {
	checkHorizontalLine(img, OFFSET);
	checkHorizontalLine(img, HEIGHT - OFFSET);
	checkVerticalLine(img, OFFSET);
	checkVerticalLine(img, WIDTH - OFFSET);
	checkCorners(img);
	}

	private static void checkHorizontalLine(final BufferedImage img,
	final int y) {
	int prev = img.getRGB(OFFSET, y);
	int curr;
	int count = 1;
	checkColor(OFFSET, y, prev, COLOR1, COLOR2);
	for (int x = OFFSET + 1; x <= WIDTH - OFFSET; x++) {
	curr = img.getRGB(x, y);
	if (curr != prev) {
	checkColor(x, y, curr, COLOR1, COLOR2);
	checkCount(x, y, count);
	prev = curr;
	count = 1;
	} else {
	count++;
	}
	if (x < WIDTH - OFFSET) {
	checkColor(x, y - 1, img.getRGB(x, y - 1), BACKGROUND);
	checkColor(x, y + 1, img.getRGB(x, y + 1), BACKGROUND);
	}
	}
	checkCount(WIDTH - OFFSET, y, count);
	}

	private static void checkVerticalLine(final BufferedImage img,
	final int x) {
	int prev = img.getRGB(x, OFFSET);
	checkColor(x, OFFSET, prev, COLOR1, COLOR2);
	int count = 1;
	for (int y = OFFSET + 1; y <= HEIGHT - OFFSET; y++) {
	int curr = img.getRGB(x, y);
	if (curr != prev) {
	checkColor(x, y, curr, COLOR1, COLOR2);
	checkCount(x, y, count);
	prev = curr;
	count = 1;
	} else {
	count++;
	}
	if (y < HEIGHT - OFFSET) {
	checkColor(x - 1, y, img.getRGB(x - 1, y), BACKGROUND);
	checkColor(x + 1, y, img.getRGB(x + 1, y), BACKGROUND);
	}
	}
	checkCount(x, HEIGHT - OFFSET, count);
	}

	private static void checkCorners(final BufferedImage img) {
	int[][] corners = {
	{OFFSET - 1, OFFSET - 1},
	{OFFSET, OFFSET - 1},
	{OFFSET - 1, OFFSET + 1},

	{OFFSET - 1, HEIGHT - OFFSET},
	{OFFSET - 1, HEIGHT - OFFSET + 1},
	{OFFSET, HEIGHT - OFFSET + 1},

	{WIDTH - OFFSET, OFFSET - 1},
	{WIDTH - OFFSET + 1, OFFSET - 1},
	{WIDTH - OFFSET + 1, OFFSET},

	{WIDTH - OFFSET + 1, HEIGHT - OFFSET},
	{WIDTH - OFFSET + 1, HEIGHT - OFFSET + 1},
	{WIDTH - OFFSET, HEIGHT - OFFSET + 1},
	};

	for (int[] corner : corners) {
	int color = img.getRGB(corner[0], corner[1]);
	checkColor(corner[0], corner[1], color, BACKGROUND);
	}
	}

	private static void checkColor(final int x, final int y,
	final int color,
	final Color... validColors) {
	checkColor(x, y, color, Arrays.stream(validColors)
	.mapToInt(Color::getRGB)
	.toArray());
	}

	private static void checkColor(final int x, final int y,
	final int color,
	final int... validColors) {
	for (int valid : validColors) {
	if (color == valid) {
	return;
	}
	}
	throw new RuntimeException("Unexpected color at " + x + ", " + y
	+ ": " + Integer.toHexString(color) + "; expected: "
	+ Arrays.stream(validColors)
	.mapToObj(Integer::toHexString)
	.collect(Collectors.joining(", ")));
	}

	private static void checkCount(final int x, final int y, final int count) {
	if (count > MAX_DASH_LENGTH) {
	throw new RuntimeException("Dash is longer than " + MAX_DASH_LENGTH
	+ " at " + x + ", " + y);
	}
	}

	private static void save(final BufferedImage img,
	final String fileName) throws IOException {
	ImageIO.write(img, "png", new File(fileName));
	}

	}