1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
173
174
175
176
177
178
179
180
181
182
183
184
185
186
187
188
189
190
191
192
193
194
195
196
197
198
199
200
201
202
203
|
/*
* Copyright (c) 2018, Oracle and/or its affiliates. All rights reserved.
* DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
*
* This code is free software; you can redistribute it and/or modify it
* under the terms of the GNU General Public License version 2 only, as
* published by the Free Software Foundation.
*
* This code is distributed in the hope that it will be useful, but WITHOUT
* ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
* FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License
* version 2 for more details (a copy is included in the LICENSE file that
* accompanied this code).
*
* You should have received a copy of the GNU General Public License version
* 2 along with this work; if not, write to the Free Software Foundation,
* Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.
*
* Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA
* or visit www.oracle.com if you need additional information or have any
* questions.
*/
/*
* @test
* @bug 6788458
* @summary Test verifies that PNGImageReader takes tRNS chunk values
* into consideration while reading non-indexed RGB PNG images.
* @run main ReadPngRGBImageWithTRNSChunk
*/
import java.awt.Graphics2D;
import java.awt.image.BufferedImage;
import java.awt.Color;
import java.io.ByteArrayInputStream;
import java.io.ByteArrayOutputStream;
import java.io.IOException;
import java.io.InputStream;
import java.util.Iterator;
import javax.imageio.ImageTypeSpecifier;
import javax.imageio.ImageWriter;
import javax.imageio.ImageIO;
import javax.imageio.ImageWriteParam;
import javax.imageio.metadata.IIOInvalidTreeException;
import javax.imageio.metadata.IIOMetadata;
import javax.imageio.metadata.IIOMetadataNode;
import javax.imageio.stream.ImageOutputStream;
import javax.imageio.IIOImage;
import java.awt.image.DataBuffer;
import java.awt.image.DataBufferUShort;
import java.awt.image.WritableRaster;
import java.awt.image.Raster;
import java.awt.color.ColorSpace;
import java.awt.image.ColorModel;
import java.awt.image.ComponentColorModel;
import java.awt.Transparency;
public class ReadPngRGBImageWithTRNSChunk {
private static BufferedImage img;
private static IIOMetadata metadata;
private static ImageWriteParam param;
private static ImageWriter writer;
private static byte[] imageByteArray;
private static void createTRNSNode(String tRNS_value)
throws IIOInvalidTreeException {
IIOMetadataNode tRNS_rgb = new IIOMetadataNode("tRNS_RGB");
tRNS_rgb.setAttribute("red", tRNS_value);
tRNS_rgb.setAttribute("green", tRNS_value);
tRNS_rgb.setAttribute("blue", tRNS_value);
IIOMetadataNode tRNS = new IIOMetadataNode("tRNS");
tRNS.appendChild(tRNS_rgb);
IIOMetadataNode root = new IIOMetadataNode("javax_imageio_png_1.0");
root.appendChild(tRNS);
metadata.mergeTree("javax_imageio_png_1.0", root);
}
private static void writeImage() throws IOException {
ByteArrayOutputStream baos = new ByteArrayOutputStream();
ImageOutputStream ios = ImageIO.createImageOutputStream(baos);
writer.setOutput(ios);
writer.write(metadata, new IIOImage(img, null, metadata), param);
writer.dispose();
baos.flush();
imageByteArray = baos.toByteArray();
baos.close();
}
private static boolean verifyAlphaValue(BufferedImage img) {
Color firstPixel = new Color(img.getRGB(0, 0), true);
Color secondPixel = new Color(img.getRGB(1, 0), true);
return firstPixel.getAlpha() != 0 ||
secondPixel.getAlpha() != 255;
}
private static boolean read8BitRGBPNGWithTRNSChunk() throws IOException {
int width = 2;
int height = 1;
// Create 8 bit PNG image
img = new BufferedImage(width, height, BufferedImage.TYPE_3BYTE_BGR);
Graphics2D g2D = img.createGraphics();
// transparent first pixel
g2D.setColor(Color.WHITE);
g2D.fillRect(0, 0, 1, 1);
// non-transparent second pixel
g2D.setColor(Color.RED);
g2D.fillRect(1, 0, 1, 1);
g2D.dispose();
Iterator<ImageWriter> iterWriter =
ImageIO.getImageWritersBySuffix("png");
writer = iterWriter.next();
param = writer.getDefaultWriteParam();
ImageTypeSpecifier specifier =
ImageTypeSpecifier.
createFromBufferedImageType(BufferedImage.TYPE_3BYTE_BGR);
metadata = writer.getDefaultImageMetadata(specifier, param);
// Create tRNS node and merge it with default metadata
createTRNSNode("255");
writeImage();
InputStream input= new ByteArrayInputStream(imageByteArray);
// Read 8 bit PNG RGB image with tRNS chunk
BufferedImage verify_img = ImageIO.read(input);
input.close();
// Verify alpha values present in first & second pixel
return verifyAlphaValue(verify_img);
}
private static boolean read16BitRGBPNGWithTRNSChunk() throws IOException {
// Create 16 bit PNG image
int height = 1;
int width = 2;
int numBands = 3;
int shortArrayLength = width * height * numBands;
short[] pixelData = new short[shortArrayLength];
// transparent first pixel
pixelData[0] = (short)0xffff;
pixelData[1] = (short)0xffff;
pixelData[2] = (short)0xffff;
// non-transparent second pixel
pixelData[3] = (short)0xffff;
pixelData[4] = (short)0xffff;
pixelData[5] = (short)0xfffe;
DataBuffer buffer = new DataBufferUShort(pixelData, shortArrayLength);
int[] bandOffset = {0, 1 ,2};
WritableRaster ras =
Raster.createInterleavedRaster(buffer, width, height,
width * numBands, numBands, bandOffset, null);
int nBits[] = {16, 16 ,16};
ColorModel colorModel = new
ComponentColorModel(ColorSpace.getInstance(ColorSpace.CS_sRGB),
nBits, false, false, Transparency.OPAQUE,
DataBuffer.TYPE_USHORT);
img = new BufferedImage(colorModel, ras, false, null);
Iterator<ImageWriter> iterWriter =
ImageIO.getImageWritersBySuffix("png");
writer = iterWriter.next();
param = writer.getDefaultWriteParam();
ImageTypeSpecifier specifier = new ImageTypeSpecifier(img);
metadata = writer.getDefaultImageMetadata(specifier, param);
// Create tRNS node and merge it with default metadata
createTRNSNode("65535");
writeImage();
InputStream input= new ByteArrayInputStream(imageByteArray);
// Read 16 bit PNG RGB image with tRNS chunk
BufferedImage verify_img = ImageIO.read(input);
input.close();
// Verify alpha values present in first & second pixel
return verifyAlphaValue(verify_img);
}
public static void main(String[] args) throws IOException {
boolean read8BitFail, read16BitFail;
// read 8 bit PNG RGB image with tRNS chunk
read8BitFail = read8BitRGBPNGWithTRNSChunk();
// read 16 bit PNG RGB image with tRNS chunk
read16BitFail = read16BitRGBPNGWithTRNSChunk();
if (read8BitFail || read16BitFail) {
throw new RuntimeException("PNGImageReader is not using" +
" transparent pixel information from tRNS chunk properly");
}
}
}
|
