1 /*
2 * Copyright (c) 2018, 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 6788458
27 * @summary Test verifies that PNGImageReader takes tRNS chunk values
28 * into consideration while reading non-indexed 8 bit PNG image.
29 * @run main Read8BitPNGWithTRNSChunk
30 */
31
32 import java.awt.Graphics2D;
33 import java.awt.image.BufferedImage;
34 import java.awt.Color;
35 import java.io.File;
36 import java.io.IOException;
37 import java.nio.file.Files;
38 import java.util.Iterator;
39 import javax.imageio.ImageTypeSpecifier;
40 import javax.imageio.ImageWriter;
41 import javax.imageio.ImageIO;
42 import javax.imageio.ImageWriteParam;
43 import javax.imageio.metadata.IIOMetadata;
44 import javax.imageio.metadata.IIOMetadataNode;
45 import javax.imageio.stream.ImageOutputStream;
46 import javax.imageio.IIOImage;
47
48 public final class Read8BitPNGWithTRNSChunk {
49
50 public static void main(String[] args) throws IOException {
51 String dir = System.getProperty("test.src");
52 String sep = System.getProperty("file.separator");
53 String filePath = dir + sep;
54 File directory = new File(filePath);
55 File output = File.createTempFile("output", "png", directory);
56 directory.delete();
57 ImageOutputStream ios = ImageIO.createImageOutputStream(output);
58 try {
59 // Create 8 bit PNG image and fill it with white color
60 BufferedImage img = new BufferedImage(1, 1, BufferedImage.TYPE_3BYTE_BGR);
61 Graphics2D g2D = img.createGraphics();
62
63 g2D.setColor(Color.WHITE);
64 g2D.fillRect(0, 0, 1, 1);
65 g2D.dispose();
66
67 Iterator<ImageWriter> iterWriter = ImageIO.getImageWritersBySuffix("png");
68 ImageWriter writer = iterWriter.next();
69
70 ImageWriteParam param = writer.getDefaultWriteParam();
71 ImageTypeSpecifier specifier = ImageTypeSpecifier.createFromBufferedImageType(BufferedImage.TYPE_3BYTE_BGR);
72 IIOMetadata metadata = writer.getDefaultImageMetadata(specifier, param);
73
74 // Create tRNS node and merge it with default metadata
75 IIOMetadataNode tRNS_rgb = new IIOMetadataNode("tRNS_RGB");
76 tRNS_rgb.setAttribute("red", "255");
77 tRNS_rgb.setAttribute("green", "255");
78 tRNS_rgb.setAttribute("blue", "255");
79
80 IIOMetadataNode tRNS = new IIOMetadataNode("tRNS");
81 tRNS.appendChild(tRNS_rgb);
82 IIOMetadataNode root = new IIOMetadataNode("javax_imageio_png_1.0");
83 root.appendChild(tRNS);
84
85 metadata.mergeTree("javax_imageio_png_1.0", root);
86
87 writer.setOutput(ios);
88
89 writer.write(metadata, new IIOImage(img, null, metadata), param);
90
91 // Read 8 bit PNG RGB image with tRNS chunk and verify
92 BufferedImage display_img = ImageIO.read(output);
93 Color c = new Color(display_img.getRGB(0, 0), true);
94 if (c.getAlpha() != 0) {
95 throw new RuntimeException("PNGImageReader is not using" +
96 " transparent pixel information present in tRNS chunk");
97 }
98 } finally {
99 ios.close();
100 Files.delete(output.toPath());
101 }
102 }
103 }
104