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.IndexColorModel;
33 import java.awt.image.VolatileImage;
34 import java.io.File;
35 import java.io.IOException;
36 import java.util.Arrays;
37 import java.util.stream.Collectors;
38 import javax.imageio.ImageIO;
39
40 import static java.awt.image.BufferedImage.TYPE_INT_RGB;
41
42 /*
43 * @test
44 * @bug 4469881 8217263 8218682
45 * @summary Verifies that dashed rectangles drawn to the screen line
46 * up with their undashed counterparts
47 * @author flar
48 * @run main/othervm -Dsun.java2d.uiScale=1 DashOffset
49 */
50 public class DashOffset {
51
52 private static final BasicStroke dash =
53 new BasicStroke(1.0f, BasicStroke.CAP_BUTT,
54 BasicStroke.JOIN_MITER, 10.0f,
55 new float[] {2.0f, 2.0f}, 0.0f);
56
57 private static final Color COLOR1 = Color.BLUE;
58 private static final Color COLOR2 = Color.GREEN;
59
60 private static final Color BACKGROUND = Color.WHITE;
61
62 private static final int WIDTH = 20;
63 private static final int HEIGHT = 20;
64
65 private static final int OFFSET = 2;
66
67 private static final int MAX_DASH_LENGTH = 3;
68
69 public static void main(String[] argv) throws Exception {
70 final boolean saveImage = argv.length > 0 && "-save".equals(argv[0]);
71
72 final BufferedImage img = new BufferedImage(WIDTH, HEIGHT,
73 TYPE_INT_RGB);
74 try {
75 draw(img);
76 validate(img);
77 } finally {
78 if (saveImage) {
79 save(img, "bufferedImage.png");
80 }
81 }
82
83 if (GraphicsEnvironment.isHeadless()) {
84 return;
85 }
86
87 BufferedImage snapshot = null;
88 try {
89 final GraphicsConfiguration gc =
90 GraphicsEnvironment.getLocalGraphicsEnvironment()
91 .getDefaultScreenDevice()
92 .getDefaultConfiguration();
93 if (gc.getColorModel() instanceof IndexColorModel) {
94 return;
95 }
96
97 VolatileImage vi = gc.createCompatibleVolatileImage(WIDTH, HEIGHT);
98 int attempt = 0;
99 do {
100 vi.validate(gc);
101 draw(vi);
102 snapshot = vi.getSnapshot();
103 } while (vi.contentsLost() && ++attempt <= 10);
104 if (attempt > 10) {
105 throw new RuntimeException("Too many attempts: " + attempt);
106 }
107 validate(snapshot);
108 } finally {
109 if (saveImage && snapshot != null) {
110 save(snapshot, "volatileImage.png");
111 }
112 }
113 }
114
115 private static void draw(final Image img) {
116 Graphics g = img.getGraphics();
117 g.setColor(BACKGROUND);
118 g.fillRect(0, 0, WIDTH, HEIGHT);
119 g.setColor(COLOR1);
120 g.drawRect(OFFSET, OFFSET, WIDTH - OFFSET * 2, HEIGHT - OFFSET * 2);
121 g.setColor(COLOR2);
122 g.clipRect(OFFSET, OFFSET, WIDTH - OFFSET * 2 + 1, HEIGHT - OFFSET * 2 + 1);
123 ((Graphics2D) g).setStroke(dash);
124 g.drawRect(OFFSET, OFFSET, WIDTH - OFFSET * 2, HEIGHT - OFFSET * 2);
125 g.dispose();
126 }
127
128 private static void validate(final BufferedImage img) {
129 checkHorizontalLine(img, OFFSET);
130 checkHorizontalLine(img, HEIGHT - OFFSET);
131 checkVerticalLine(img, OFFSET);
132 checkVerticalLine(img, WIDTH - OFFSET);
133 checkCorners(img);
134 }
135
136 private static void checkHorizontalLine(final BufferedImage img,
137 final int y) {
138 int prev = img.getRGB(OFFSET, y);
139 int curr;
140 int count = 1;
141 checkColor(OFFSET, y, prev, COLOR1, COLOR2);
142 for (int x = OFFSET + 1; x <= WIDTH - OFFSET; x++) {
143 curr = img.getRGB(x, y);
144 if (curr != prev) {
145 checkColor(x, y, curr, COLOR1, COLOR2);
146 checkCount(x, y, count);
147 prev = curr;
148 count = 1;
149 } else {
150 count++;
151 }
152 if (x < WIDTH - OFFSET) {
153 checkColor(x, y - 1, img.getRGB(x, y - 1), BACKGROUND);
154 checkColor(x, y + 1, img.getRGB(x, y + 1), BACKGROUND);
155 }
156 }
157 checkCount(WIDTH - OFFSET, y, count);
158 }
159
160 private static void checkVerticalLine(final BufferedImage img,
161 final int x) {
162 int prev = img.getRGB(x, OFFSET);
163 checkColor(x, OFFSET, prev, COLOR1, COLOR2);
164 int count = 1;
165 for (int y = OFFSET + 1; y <= HEIGHT - OFFSET; y++) {
166 int curr = img.getRGB(x, y);
167 if (curr != prev) {
168 checkColor(x, y, curr, COLOR1, COLOR2);
169 checkCount(x, y, count);
170 prev = curr;
171 count = 1;
172 } else {
173 count++;
174 }
175 if (y < HEIGHT - OFFSET) {
176 checkColor(x - 1, y, img.getRGB(x - 1, y), BACKGROUND);
177 checkColor(x + 1, y, img.getRGB(x + 1, y), BACKGROUND);
178 }
179 }
180 checkCount(x, HEIGHT - OFFSET, count);
181 }
182
183 private static void checkCorners(final BufferedImage img) {
184 int[][] corners = {
185 {OFFSET - 1, OFFSET - 1},
186 {OFFSET, OFFSET - 1},
187 {OFFSET - 1, OFFSET + 1},
188
189 {OFFSET - 1, HEIGHT - OFFSET},
190 {OFFSET - 1, HEIGHT - OFFSET + 1},
191 {OFFSET, HEIGHT - OFFSET + 1},
192
193 {WIDTH - OFFSET, OFFSET - 1},
194 {WIDTH - OFFSET + 1, OFFSET - 1},
195 {WIDTH - OFFSET + 1, OFFSET},
196
197 {WIDTH - OFFSET + 1, HEIGHT - OFFSET},
198 {WIDTH - OFFSET + 1, HEIGHT - OFFSET + 1},
199 {WIDTH - OFFSET, HEIGHT - OFFSET + 1},
200 };
201
202 for (int[] corner : corners) {
203 int color = img.getRGB(corner[0], corner[1]);
204 checkColor(corner[0], corner[1], color, BACKGROUND);
205 }
206 }
207
208 private static void checkColor(final int x, final int y,
209 final int color,
210 final Color... validColors) {
211 checkColor(x, y, color, Arrays.stream(validColors)
212 .mapToInt(Color::getRGB)
213 .toArray());
214 }
215
216 private static void checkColor(final int x, final int y,
217 final int color,
218 final int... validColors) {
219 for (int valid : validColors) {
220 if (color == valid) {
221 return;
222 }
223 }
224 throw new RuntimeException("Unexpected color at " + x + ", " + y
225 + ": " + Integer.toHexString(color) + "; expected: "
226 + Arrays.stream(validColors)
227 .mapToObj(Integer::toHexString)
228 .collect(Collectors.joining(", ")));
229 }
230
231 private static void checkCount(final int x, final int y, final int count) {
232 if (count > MAX_DASH_LENGTH) {
233 throw new RuntimeException("Dash is longer than " + MAX_DASH_LENGTH
234 + " at " + x + ", " + y);
235 }
236 }
237
238 private static void save(final BufferedImage img,
239 final String fileName) throws IOException {
240 ImageIO.write(img, "png", new File(fileName));
241 }
242
243 }