1 /*
2 * Copyright (c) 2017, 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 /*
25 * @test
26 * @bug 8191431
27 * @summary Test verifies that whether we can use same PNGImageReader instance
28 * to read multiple images or not. It also verifies whether
29 * imageStartPosition in PNGImageReader is updated properly when we
30 * use same PNGImageReader instance to read multiple images.
31 * @run main PngMultipleImageReadTest
32 */
33
34 import java.awt.Color;
35 import java.awt.Graphics2D;
36 import java.awt.image.BufferedImage;
37 import java.awt.image.IndexColorModel;
38 import java.io.File;
39 import java.io.IOException;
40 import java.nio.file.Files;
41 import javax.imageio.ImageIO;
42 import javax.imageio.ImageReadParam;
43 import javax.imageio.ImageReader;
44 import javax.imageio.stream.ImageInputStream;
45
46 public class PngMultipleImageReadTest {
47
48 private static final ImageReader PNG_READER =
49 ImageIO.getImageReadersByMIMEType("image/png").next();
50
51 public static void main(String[] args) throws IOException {
52
53 /*
54 * First we create a PNG image without palette so that the IDAT
55 * start position in the stream is at some position 'x'.
56 */
57 BufferedImage imageWithoutPalette =
58 new BufferedImage(20, 20, BufferedImage.TYPE_INT_ARGB);
59 Graphics2D g1 = imageWithoutPalette.createGraphics();
60 g1.setColor(Color.WHITE);
61 g1.fillRect(0, 0, 20, 20);
62 g1.dispose();
63 writeAndReadImageWithoutPalette(imageWithoutPalette);
64
65 /*
66 * We create another PNG image with PLTE(palette) chunk so that
67 * now the IDAT start position is at some 'x + y'.
68 */
69 IndexColorModel cm = new IndexColorModel(
70 3,
71 1,
72 new byte[]{10}, // r
73 new byte[]{10}, // g
74 new byte[]{10}); // b
75 BufferedImage imageWithPalette = new BufferedImage(
76 10, 10,
77 BufferedImage.TYPE_BYTE_INDEXED,
78 cm);
79 Graphics2D g2 = imageWithPalette.createGraphics();
80 g2.setColor(Color.BLACK);
81 g2.fillRect(0, 0, 10, 10);
82 g2.dispose();
83 writeAndReadImageWithPalette(imageWithPalette);
84 }
85
86 private static void writeAndReadImageWithoutPalette(BufferedImage image)
87 throws IOException {
88 File output = File.createTempFile("output", ".png");
89 ImageInputStream stream = null;
90 try {
91 ImageIO.write(image, "png", output);
92
93 stream = ImageIO.createImageInputStream(output);
94 ImageReadParam param = PNG_READER.getDefaultReadParam();
95 PNG_READER.setInput(stream, true, true);
96 PNG_READER.read(0, param);
97 } finally {
98 if (stream != null) {
99 stream.close();
100 }
101 Files.delete(output.toPath());
102 }
103 }
104
105 private static void writeAndReadImageWithPalette(BufferedImage image)
106 throws IOException {
107 File output = File.createTempFile("output", ".png");
108 ImageInputStream stream = null;
109 try {
110 ImageIO.write(image, "png", output);
111
112 stream = ImageIO.createImageInputStream(output);
113 ImageReadParam param = PNG_READER.getDefaultReadParam();
114 PNG_READER.setInput(stream, true, true);
115 PNG_READER.read(0, param);
116 } finally {
117 if (stream != null) {
118 stream.close();
119 }
120 Files.delete(output.toPath());
121 }
122 }
123 }
124