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
67 int height = 1;
68 int width = 2;
69 int numBands = 3;
70 int shortArrayLength = width * height * numBands;
71 short[] pixelData = new short[shortArrayLength];
72 // transparent first pixel
73 pixelData[0] = (short)0xffff;
74 pixelData[1] = (short)0xffff;
75 pixelData[2] = (short)0xffff;
76 // non-transparent second pixel
77 pixelData[3] = (short)0xffff;
78 pixelData[4] = (short)0xffff;
79 pixelData[5] = (short)0xfffe;
80
81 DataBuffer buffer = new DataBufferUShort(pixelData, shortArrayLength);
82
83 int[] bandOffset = {0, 1 ,2};
84 WritableRaster ras =
85 Raster.createInterleavedRaster(buffer, width, height,
86 width * numBands, numBands, bandOffset, null);
87
88 int nBits[] = {16, 16 ,16};
89 ColorModel colorModel = new
90 ComponentColorModel(ColorSpace.getInstance(ColorSpace.CS_sRGB),
91 nBits, false, false, Transparency.OPAQUE,
92 DataBuffer.TYPE_USHORT);
93 BufferedImage img = new BufferedImage(colorModel, ras,
94 false, null);
95
96 Iterator<ImageWriter> iterWriter =
97 ImageIO.getImageWritersBySuffix("png");
98 ImageWriter writer = iterWriter.next();
99
100 ImageWriteParam param = writer.getDefaultWriteParam();
101 ImageTypeSpecifier specifier =
102 ImageTypeSpecifier.
103 createFromBufferedImageType(BufferedImage.TYPE_3BYTE_BGR);
104 IIOMetadata metadata =
105 writer.getDefaultImageMetadata(specifier, param);
106
107 // Create tRNS node and merge it with default metadata
108 IIOMetadataNode tRNS_rgb = new IIOMetadataNode("tRNS_RGB");
109 tRNS_rgb.setAttribute("red", "65535");
110 tRNS_rgb.setAttribute("green", "65535");
111 tRNS_rgb.setAttribute("blue", "65535");
112
113 IIOMetadataNode tRNS = new IIOMetadataNode("tRNS");
114 tRNS.appendChild(tRNS_rgb);
115 IIOMetadataNode root =
116 new IIOMetadataNode("javax_imageio_png_1.0");
117 root.appendChild(tRNS);
118
119 metadata.mergeTree("javax_imageio_png_1.0", root);
120
121 writer.setOutput(ios);
122
123 writer.write(metadata, new IIOImage(img, null, metadata), param);
124
125 // Read 16 bit PNG RGB image with tRNS chunk
126 BufferedImage display_img = ImageIO.read(output);
127 // Verify alpha values present in first & second pixel
128 Color firstPixel = new Color(display_img.getRGB(0, 0), true);
129 Color secondPixel = new Color(display_img.getRGB(1, 0), true);
130 if (firstPixel.getAlpha() != 0 ||
131 secondPixel.getAlpha() != 255)
132 {
133 throw new RuntimeException("PNGImageReader is not using" +
134 " transparent pixel information from tRNS chunk properly");
135 }
136 } finally {
137 ios.close();
138 Files.delete(output.toPath());
139 }
140
141 }
142 }
143