--- /dev/null Thu Jan 01 00:00:00 1970 +0000
+++ b/test/jdk/java/awt/BasicStroke/DashOffset.java Thu Feb 07 13:57:12 2019 +0000
@@ -0,0 +1,239 @@
+/*
+ * 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.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
+ * @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();
+
+ 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) {
+ 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));
+ }
+
+}