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 RGB PNG images.
29 * @run main ReadPngRGBImageWithTRNSChunk
30 */
31
32 import java.awt.Graphics2D;
33 import java.awt.image.BufferedImage;
34 import java.awt.Color;
35 import java.io.ByteArrayInputStream;
36 import java.io.ByteArrayOutputStream;
37 import java.io.IOException;
38 import java.io.InputStream;
39 import java.util.Iterator;
40 import javax.imageio.ImageTypeSpecifier;
41 import javax.imageio.ImageWriter;
42 import javax.imageio.ImageIO;
43 import javax.imageio.ImageWriteParam;
44 import javax.imageio.metadata.IIOInvalidTreeException;
45 import javax.imageio.metadata.IIOMetadata;
46 import javax.imageio.metadata.IIOMetadataNode;
47 import javax.imageio.stream.ImageOutputStream;
48 import javax.imageio.IIOImage;
49 import java.awt.image.DataBuffer;
50 import java.awt.image.DataBufferUShort;
51 import java.awt.image.WritableRaster;
52 import java.awt.image.Raster;
53 import java.awt.color.ColorSpace;
54 import java.awt.image.ColorModel;
55 import java.awt.image.ComponentColorModel;
56 import java.awt.Transparency;
57
58 public class ReadPngRGBImageWithTRNSChunk {
59
60 private static BufferedImage img;
61 private static IIOMetadata metadata;
62 private static ImageWriteParam param;
63 private static ImageWriter writer;
64 private static byte[] imageByteArray;
65
66 private static void createTRNSNode(String tRNS_value)
67 throws IIOInvalidTreeException {
68 IIOMetadataNode tRNS_rgb = new IIOMetadataNode("tRNS_RGB");
69 tRNS_rgb.setAttribute("red", tRNS_value);
70 tRNS_rgb.setAttribute("green", tRNS_value);
71 tRNS_rgb.setAttribute("blue", tRNS_value);
72
73 IIOMetadataNode tRNS = new IIOMetadataNode("tRNS");
74 tRNS.appendChild(tRNS_rgb);
75 IIOMetadataNode root = new IIOMetadataNode("javax_imageio_png_1.0");
76 root.appendChild(tRNS);
77 metadata.mergeTree("javax_imageio_png_1.0", root);
78 }
79
80 private static void writeImage() throws IOException {
81 ByteArrayOutputStream baos = new ByteArrayOutputStream();
82 ImageOutputStream ios = ImageIO.createImageOutputStream(baos);
83 writer.setOutput(ios);
84 writer.write(metadata, new IIOImage(img, null, metadata), param);
85 writer.dispose();
86
87 baos.flush();
88 imageByteArray = baos.toByteArray();
89 baos.close();
90 }
91
92 private static boolean verifyAlphaValue(BufferedImage img) {
93 Color firstPixel = new Color(img.getRGB(0, 0), true);
94 Color secondPixel = new Color(img.getRGB(1, 0), true);
95
96 return firstPixel.getAlpha() != 0 ||
97 secondPixel.getAlpha() != 255;
98 }
99
100 private static boolean read8BitRGBPNGWithTRNSChunk() throws IOException {
101 int width = 2;
102 int height = 1;
103 // Create 8 bit PNG image
104 img = new BufferedImage(width, height, BufferedImage.TYPE_3BYTE_BGR);
105 Graphics2D g2D = img.createGraphics();
106
107 // transparent first pixel
108 g2D.setColor(Color.WHITE);
109 g2D.fillRect(0, 0, 1, 1);
110 // non-transparent second pixel
111 g2D.setColor(Color.RED);
112 g2D.fillRect(1, 0, 1, 1);
113 g2D.dispose();
114
115 Iterator<ImageWriter> iterWriter =
116 ImageIO.getImageWritersBySuffix("png");
117 writer = iterWriter.next();
118
119 param = writer.getDefaultWriteParam();
120 ImageTypeSpecifier specifier =
121 ImageTypeSpecifier.
122 createFromBufferedImageType(BufferedImage.TYPE_3BYTE_BGR);
123 metadata = writer.getDefaultImageMetadata(specifier, param);
124
125 // Create tRNS node and merge it with default metadata
126 createTRNSNode("255");
127
128 writeImage();
129
130 InputStream input= new ByteArrayInputStream(imageByteArray);
131 // Read 8 bit PNG RGB image with tRNS chunk
132 BufferedImage verify_img = ImageIO.read(input);
133 input.close();
134 // Verify alpha values present in first & second pixel
135 return verifyAlphaValue(verify_img);
136 }
137
138 private static boolean read16BitRGBPNGWithTRNSChunk() throws IOException {
139 // Create 16 bit PNG image
140 int height = 1;
141 int width = 2;
142 int numBands = 3;
143 int shortArrayLength = width * height * numBands;
144 short[] pixelData = new short[shortArrayLength];
145 // transparent first pixel
146 pixelData[0] = (short)0xffff;
147 pixelData[1] = (short)0xffff;
148 pixelData[2] = (short)0xffff;
149 // non-transparent second pixel
150 pixelData[3] = (short)0xffff;
151 pixelData[4] = (short)0xffff;
152 pixelData[5] = (short)0xfffe;
153
154 DataBuffer buffer = new DataBufferUShort(pixelData, shortArrayLength);
155
156 int[] bandOffset = {0, 1 ,2};
157 WritableRaster ras =
158 Raster.createInterleavedRaster(buffer, width, height,
159 width * numBands, numBands, bandOffset, null);
160
161 int nBits[] = {16, 16 ,16};
162 ColorModel colorModel = new
163 ComponentColorModel(ColorSpace.getInstance(ColorSpace.CS_sRGB),
164 nBits, false, false, Transparency.OPAQUE,
165 DataBuffer.TYPE_USHORT);
166 img = new BufferedImage(colorModel, ras, false, null);
167
168 Iterator<ImageWriter> iterWriter =
169 ImageIO.getImageWritersBySuffix("png");
170 writer = iterWriter.next();
171
172 param = writer.getDefaultWriteParam();
173 ImageTypeSpecifier specifier = new ImageTypeSpecifier(img);
174 metadata = writer.getDefaultImageMetadata(specifier, param);
175
176 // Create tRNS node and merge it with default metadata
177 createTRNSNode("65535");
178
179 writeImage();
180
181 InputStream input= new ByteArrayInputStream(imageByteArray);
182 // Read 16 bit PNG RGB image with tRNS chunk
183 BufferedImage verify_img = ImageIO.read(input);
184 input.close();
185 // Verify alpha values present in first & second pixel
186 return verifyAlphaValue(verify_img);
187 }
188
189 public static void main(String[] args) throws IOException {
190 boolean read8BitFail, read16BitFail;
191 // read 8 bit PNG RGB image with tRNS chunk
192 read8BitFail = read8BitRGBPNGWithTRNSChunk();
193
194 // read 16 bit PNG RGB image with tRNS chunk
195 read16BitFail = read16BitRGBPNGWithTRNSChunk();
196
197 if (read8BitFail || read16BitFail) {
198 throw new RuntimeException("PNGImageReader is not using" +
199 " transparent pixel information from tRNS chunk properly");
200 }
201 }
202 }
203