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 16 bit PNG image.
29 * @run main Read16BitPNGWithTRNSChunk
30 */
31
32 import java.awt.color.ColorSpace;
33 import java.awt.image.BufferedImage;
34 import java.awt.image.ColorModel;
35 import java.awt.image.ComponentColorModel;
36 import java.awt.image.DataBuffer;
37 import java.awt.image.DataBufferUShort;
38 import java.awt.image.WritableRaster;
39 import java.awt.image.Raster;
40 import java.awt.Color;
41 import java.awt.Transparency;
42 import java.io.File;
43 import java.io.IOException;
44 import java.nio.file.Files;
45 import java.util.Iterator;
46 import javax.imageio.ImageTypeSpecifier;
47 import javax.imageio.ImageWriter;
48 import javax.imageio.ImageIO;
49 import javax.imageio.ImageWriteParam;
50 import javax.imageio.metadata.IIOMetadata;
51 import javax.imageio.metadata.IIOMetadataNode;
52 import javax.imageio.stream.ImageOutputStream;
53 import javax.imageio.IIOImage;
54
55 public final class Read16BitPNGWithTRNSChunk {
56
57 public static void main(String[] args) throws IOException {
58 String dir = System.getProperty("test.src");
59 String sep = System.getProperty("file.separator");
60 String filePath = dir + sep;
61 File directory = new File(filePath);
62 File output = File.createTempFile("output", "png", directory);
63 directory.delete();
64 ImageOutputStream ios = ImageIO.createImageOutputStream(output);
65 try {
66 // Create 16 bit PNG image and fill it with white color
67 int height = 50;
68 int width = 50;
69 int numBands = 3;
70 int shortArrayLength = width * height * numBands;
71 short[] pixelData = new short[shortArrayLength];
72 for (int i = 0; i < shortArrayLength; i++) {
73 pixelData[i] = (short)0xffff;
74 }
75
76 DataBuffer buffer = new DataBufferUShort(pixelData, shortArrayLength);
77
78 int[] bandOffset = {0, 1 ,2};
79 WritableRaster ras =
80 Raster.createInterleavedRaster(buffer, width, height,
81 width * numBands, numBands, bandOffset, null);
82
83 int nBits[] = {16, 16 ,16};
84 ColorModel colorModel = new
85 ComponentColorModel(ColorSpace.getInstance(ColorSpace.CS_sRGB),
86 nBits, false, false, Transparency.OPAQUE,
87 DataBuffer.TYPE_USHORT);
88 BufferedImage img = new BufferedImage(colorModel, ras,
89 false, null);
90
91 Iterator<ImageWriter> iterWriter =
92 ImageIO.getImageWritersBySuffix("png");
93 ImageWriter writer = iterWriter.next();
94
95 ImageWriteParam param = writer.getDefaultWriteParam();
96 ImageTypeSpecifier specifier =
97 ImageTypeSpecifier.
98 createFromBufferedImageType(BufferedImage.TYPE_3BYTE_BGR);
99 IIOMetadata metadata =
100 writer.getDefaultImageMetadata(specifier, param);
101
102 // Create tRNS node and merge it with default metadata
103 IIOMetadataNode tRNS_rgb = new IIOMetadataNode("tRNS_RGB");
104 tRNS_rgb.setAttribute("red", "65535");
105 tRNS_rgb.setAttribute("green", "65535");
106 tRNS_rgb.setAttribute("blue", "65535");
107
108 IIOMetadataNode tRNS = new IIOMetadataNode("tRNS");
109 tRNS.appendChild(tRNS_rgb);
110 IIOMetadataNode root =
111 new IIOMetadataNode("javax_imageio_png_1.0");
112 root.appendChild(tRNS);
113
114 metadata.mergeTree("javax_imageio_png_1.0", root);
115
116 writer.setOutput(ios);
117
118 writer.write(metadata, new IIOImage(img, null, metadata), param);
119
120 // Read 16 bit PNG RGB image with tRNS chunk and verify
121 BufferedImage display_img = ImageIO.read(output);
122 Color c = new Color(display_img.getRGB(0, 0), true);
123 if (c.getAlpha() != 0) {
124 throw new RuntimeException("PNGImageReader is not using" +
125 " transparent pixel information present in tRNS chunk");
126 }
127 } finally {
128 ios.close();
129 Files.delete(output.toPath());
130 }
131
132 }
133 }
134