1 /*
2 * Copyright (c) 2001, 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 import java.awt.BasicStroke;
25 import java.awt.Color;
26 import java.awt.Graphics;
27 import java.awt.Graphics2D;
28 import java.awt.GraphicsConfiguration;
29 import java.awt.GraphicsEnvironment;
30 import java.awt.Image;
31 import java.awt.image.BufferedImage;
32 import java.awt.image.VolatileImage;
33 import java.io.File;
34 import java.io.IOException;
35 import java.util.Arrays;
36 import java.util.stream.Collectors;
37 import javax.imageio.ImageIO;
38
39 import static java.awt.image.BufferedImage.TYPE_INT_RGB;
40
41 /*
42 * @test
43 * @bug 4469881 8217263
44 * @summary Verifies that dashed rectangles drawn to the screen line
45 * up with their undashed counterparts
46 * @author flar
47 * @run main/othervm -Dsun.java2d.uiScale=1 DashOffset
48 */
49 public class DashOffset {
50
51 private static final BasicStroke dash =
52 new BasicStroke(1.0f, BasicStroke.CAP_BUTT,
53 BasicStroke.JOIN_MITER, 10.0f,
54 new float[] {2.0f, 2.0f}, 0.0f);
55
56 private static final Color COLOR1 = Color.BLUE;
57 private static final Color COLOR2 = Color.GREEN;
58
59 private static final Color BACKGROUND = Color.WHITE;
60
61 private static final int WIDTH = 20;
62 private static final int HEIGHT = 20;
63
64 private static final int OFFSET = 2;
65
66 private static final int MAX_DASH_LENGTH = 3;
67
68 public static void main(String[] argv) throws Exception {
69 final boolean saveImage = argv.length > 0 && "-save".equals(argv[0]);
70
71 final BufferedImage img = new BufferedImage(WIDTH, HEIGHT,
72 TYPE_INT_RGB);
73 try {
74 draw(img);
75 validate(img);
76 } finally {
77 if (saveImage) {
78 save(img, "bufferedImage.png");
79 }
80 }
81
82 if (GraphicsEnvironment.isHeadless()) {
83 return;
84 }
85
86 BufferedImage snapshot = null;
87 try {
88 final GraphicsConfiguration gc =
89 GraphicsEnvironment.getLocalGraphicsEnvironment()
90 .getDefaultScreenDevice()
91 .getDefaultConfiguration();
92
93 VolatileImage vi = gc.createCompatibleVolatileImage(WIDTH, HEIGHT);
94 int attempt = 0;
95 do {
96 vi.validate(gc);
97 draw(vi);
98 snapshot = vi.getSnapshot();
99 } while (vi.contentsLost() && ++attempt <= 10);
100 if (attempt > 10) {
101 throw new RuntimeException("Too many attempts: " + attempt);
102 }
103 validate(snapshot);
104 } finally {
105 if (saveImage) {
106 save(snapshot, "volatileImage.png");
107 }
108 }
109 }
110
111 private static void draw(final Image img) {
112 Graphics g = img.getGraphics();
113 g.setColor(BACKGROUND);
114 g.fillRect(0, 0, WIDTH, HEIGHT);
115 g.setColor(COLOR1);
116 g.drawRect(OFFSET, OFFSET, WIDTH - OFFSET * 2, HEIGHT - OFFSET * 2);
117 g.setColor(COLOR2);
118 g.clipRect(OFFSET, OFFSET, WIDTH - OFFSET * 2 + 1, HEIGHT - OFFSET * 2 + 1);
119 ((Graphics2D) g).setStroke(dash);
120 g.drawRect(OFFSET, OFFSET, WIDTH - OFFSET * 2, HEIGHT - OFFSET * 2);
121 g.dispose();
122 }
123
124 private static void validate(final BufferedImage img) {
125 checkHorizontalLine(img, OFFSET);
126 checkHorizontalLine(img, HEIGHT - OFFSET);
127 checkVerticalLine(img, OFFSET);
128 checkVerticalLine(img, WIDTH - OFFSET);
129 checkCorners(img);
130 }
131
132 private static void checkHorizontalLine(final BufferedImage img,
133 final int y) {
134 int prev = img.getRGB(OFFSET, y);
135 int curr;
136 int count = 1;
137 checkColor(OFFSET, y, prev, COLOR1, COLOR2);
138 for (int x = OFFSET + 1; x <= WIDTH - OFFSET; x++) {
139 curr = img.getRGB(x, y);
140 if (curr != prev) {
141 checkColor(x, y, curr, COLOR1, COLOR2);
142 checkCount(x, y, count);
143 prev = curr;
144 count = 1;
145 } else {
146 count++;
147 }
148 if (x < WIDTH - OFFSET) {
149 checkColor(x, y - 1, img.getRGB(x, y - 1), BACKGROUND);
150 checkColor(x, y + 1, img.getRGB(x, y + 1), BACKGROUND);
151 }
152 }
153 checkCount(WIDTH - OFFSET, y, count);
154 }
155
156 private static void checkVerticalLine(final BufferedImage img,
157 final int x) {
158 int prev = img.getRGB(x, OFFSET);
159 checkColor(x, OFFSET, prev, COLOR1, COLOR2);
160 int count = 1;
161 for (int y = OFFSET + 1; y <= HEIGHT - OFFSET; y++) {
162 int curr = img.getRGB(x, y);
163 if (curr != prev) {
164 checkColor(x, y, curr, COLOR1, COLOR2);
165 checkCount(x, y, count);
166 prev = curr;
167 count = 1;
168 } else {
169 count++;
170 }
171 if (y < HEIGHT - OFFSET) {
172 checkColor(x - 1, y, img.getRGB(x - 1, y), BACKGROUND);
173 checkColor(x + 1, y, img.getRGB(x + 1, y), BACKGROUND);
174 }
175 }
176 checkCount(x, HEIGHT - OFFSET, count);
177 }
178
179 private static void checkCorners(final BufferedImage img) {
180 int[][] corners = {
181 {OFFSET - 1, OFFSET - 1},
182 {OFFSET, OFFSET - 1},
183 {OFFSET - 1, OFFSET + 1},
184
185 {OFFSET - 1, HEIGHT - OFFSET},
186 {OFFSET - 1, HEIGHT - OFFSET + 1},
187 {OFFSET, HEIGHT - OFFSET + 1},
188
189 {WIDTH - OFFSET, OFFSET - 1},
190 {WIDTH - OFFSET + 1, OFFSET - 1},
191 {WIDTH - OFFSET + 1, OFFSET},
192
193 {WIDTH - OFFSET + 1, HEIGHT - OFFSET},
194 {WIDTH - OFFSET + 1, HEIGHT - OFFSET + 1},
195 {WIDTH - OFFSET, HEIGHT - OFFSET + 1},
196 };
197
198 for (int[] corner : corners) {
199 int color = img.getRGB(corner[0], corner[1]);
200 checkColor(corner[0], corner[1], color, BACKGROUND);
201 }
202 }
203
204 private static void checkColor(final int x, final int y,
205 final int color,
206 final Color... validColors) {
207 checkColor(x, y, color, Arrays.stream(validColors)
208 .mapToInt(Color::getRGB)
209 .toArray());
210 }
211
212 private static void checkColor(final int x, final int y,
213 final int color,
214 final int... validColors) {
215 for (int valid : validColors) {
216 if (color == valid) {
217 return;
218 }
219 }
220 throw new RuntimeException("Unexpected color at " + x + ", " + y
221 + ": " + Integer.toHexString(color) + "; expected: "
222 + Arrays.stream(validColors)
223 .mapToObj(Integer::toHexString)
224 .collect(Collectors.joining(", ")));
225 }
226
227 private static void checkCount(final int x, final int y, final int count) {
228 if (count > MAX_DASH_LENGTH) {
229 throw new RuntimeException("Dash is longer than " + MAX_DASH_LENGTH
230 + " at " + x + ", " + y);
231 }
232 }
233
234 private static void save(final BufferedImage img,
235 final String fileName) throws IOException {
236 ImageIO.write(img, "png", new File(fileName));
237 }
238
239 }