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.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 import java.awt.image.DataBuffer;
48 import java.awt.image.DataBufferUShort;
49 import java.awt.image.WritableRaster;
50 import java.awt.image.Raster;
51 import java.awt.color.ColorSpace;
52 import java.awt.image.ColorModel;
53 import java.awt.image.ComponentColorModel;
54 import java.awt.Transparency;
55
56 public class ReadPngRGBImageWithTRNSChunk {
57
58 private static ImageOutputStream ios;
59 private static File output;
60 private static IIOMetadataNode root;
61
62 private static void createOutputStream() throws IOException {
63 String dir = System.getProperty("test.src");
64 String sep = System.getProperty("file.separator");
65 String filePath = dir + sep;
66 File directory = new File(filePath);
67 output = File.createTempFile("output", "png", directory);
68 ios = ImageIO.createImageOutputStream(output);
69 }
70
71 private static void createTRNSNode(String tRNS_value) {
72 IIOMetadataNode tRNS_rgb = new IIOMetadataNode("tRNS_RGB");
73 tRNS_rgb.setAttribute("red", tRNS_value);
74 tRNS_rgb.setAttribute("green", tRNS_value);
75 tRNS_rgb.setAttribute("blue", tRNS_value);
76
77 IIOMetadataNode tRNS = new IIOMetadataNode("tRNS");
78 tRNS.appendChild(tRNS_rgb);
79 root = new IIOMetadataNode("javax_imageio_png_1.0");
80 root.appendChild(tRNS);
81 }
82
83 private static boolean verifyAlphaValue(BufferedImage img) {
84 Color firstPixel = new Color(img.getRGB(0, 0), true);
85 Color secondPixel = new Color(img.getRGB(1, 0), true);
86
87 return firstPixel.getAlpha() != 0 ||
88 secondPixel.getAlpha() != 255;
89 }
90
91 private static boolean read8BitRGBPNGWithTRNSChunk() throws IOException {
92 int width = 2;
93 int height = 1;
94 // Create 8 bit PNG image
95 BufferedImage img =
96 new BufferedImage(width, height, BufferedImage.TYPE_3BYTE_BGR);
97 Graphics2D g2D = img.createGraphics();
98
99 // transparent first pixel
100 g2D.setColor(Color.WHITE);
101 g2D.fillRect(0, 0, 1, 1);
102 // non-transparent second pixel
103 g2D.setColor(Color.RED);
104 g2D.fillRect(1, 0, 1, 1);
105 g2D.dispose();
106
107 Iterator<ImageWriter> iterWriter =
108 ImageIO.getImageWritersBySuffix("png");
109 ImageWriter writer = iterWriter.next();
110
111 ImageWriteParam param = writer.getDefaultWriteParam();
112 ImageTypeSpecifier specifier =
113 ImageTypeSpecifier.
114 createFromBufferedImageType(BufferedImage.TYPE_3BYTE_BGR);
115 IIOMetadata metadata =
116 writer.getDefaultImageMetadata(specifier, param);
117
118 // Create tRNS node and merge it with default metadata
119 createTRNSNode("255");
120
121 metadata.mergeTree("javax_imageio_png_1.0", root);
122
123 writer.setOutput(ios);
124
125 writer.write(metadata, new IIOImage(img, null, metadata), param);
126 writer.dispose();
127
128 // Read 8 bit PNG RGB image with tRNS chunk
129 BufferedImage display_img = ImageIO.read(output);
130 // Verify alpha values present in first & second pixel
131 return verifyAlphaValue(display_img);
132 }
133
134 private static boolean read16BitRGBPNGWithTRNSChunk() throws IOException {
135 // Create 16 bit PNG image
136 int height = 1;
137 int width = 2;
138 int numBands = 3;
139 int shortArrayLength = width * height * numBands;
140 short[] pixelData = new short[shortArrayLength];
141 // transparent first pixel
142 pixelData[0] = (short)0xffff;
143 pixelData[1] = (short)0xffff;
144 pixelData[2] = (short)0xffff;
145 // non-transparent second pixel
146 pixelData[3] = (short)0xffff;
147 pixelData[4] = (short)0xffff;
148 pixelData[5] = (short)0xfffe;
149
150 DataBuffer buffer = new DataBufferUShort(pixelData, shortArrayLength);
151
152 int[] bandOffset = {0, 1 ,2};
153 WritableRaster ras =
154 Raster.createInterleavedRaster(buffer, width, height,
155 width * numBands, numBands, bandOffset, null);
156
157 int nBits[] = {16, 16 ,16};
158 ColorModel colorModel = new
159 ComponentColorModel(ColorSpace.getInstance(ColorSpace.CS_sRGB),
160 nBits, false, false, Transparency.OPAQUE,
161 DataBuffer.TYPE_USHORT);
162 BufferedImage img = new BufferedImage(colorModel, ras,
163 false, null);
164
165 Iterator<ImageWriter> iterWriter =
166 ImageIO.getImageWritersBySuffix("png");
167 ImageWriter writer = iterWriter.next();
168
169 ImageWriteParam param = writer.getDefaultWriteParam();
170 ImageTypeSpecifier specifier =
171 ImageTypeSpecifier.
172 createFromBufferedImageType(BufferedImage.TYPE_3BYTE_BGR);
173 IIOMetadata metadata =
174 writer.getDefaultImageMetadata(specifier, param);
175
176 // Create tRNS node and merge it with default metadata
177 createTRNSNode("65535");
178
179 metadata.mergeTree("javax_imageio_png_1.0", root);
180
181 writer.setOutput(ios);
182
183 writer.write(metadata, new IIOImage(img, null, metadata), param);
184 writer.dispose();
185
186 // Read 16 bit PNG RGB image with tRNS chunk
187 BufferedImage display_img = ImageIO.read(output);
188 // Verify alpha values present in first & second pixel
189 return verifyAlphaValue(display_img);
190 }
191
192 public static void main(String[] args) throws IOException {
193 // read 8 bit PNG RGB image with tRNS chunk
194 boolean read8BitFail, read16BitFail;
195 try {
196 createOutputStream();
197 read8BitFail = read8BitRGBPNGWithTRNSChunk();
198 } finally {
199 if (ios != null) {
200 ios.close();
201 }
202 if (output != null) {
203 Files.delete(output.toPath());
204 }
205 }
206
207 // read 16 bit PNG RGB image with tRNS chunk
208 try {
209 createOutputStream();
210 read16BitFail = read16BitRGBPNGWithTRNSChunk();
211 } finally {
212 if (ios != null) {
213 ios.close();
214 }
215 if (output != null) {
216 Files.delete(output.toPath());
217 }
218 }
219
220 if (read8BitFail || read16BitFail) {
221 throw new RuntimeException("PNGImageReader is not using" +
222 " transparent pixel information from tRNS chunk properly");
223 }
224 }
225 }
226