/* * 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 * @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"); } } if (GraphicsEnvironment.isHeadless()) { return; } BufferedImage snapshot = null; try { final GraphicsConfiguration gc = GraphicsEnvironment.getLocalGraphicsEnvironment() .getDefaultScreenDevice() .getDefaultConfiguration(); if (gc.getColorModel() instanceof 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)); } }