1 /*
2 * Copyright (c) 2007, 2017 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. Oracle designates this
8 * particular file as subject to the "Classpath" exception as provided
9 * by Oracle in the LICENSE file that accompanied this code.
10 *
11 * This code is distributed in the hope that it will be useful, but WITHOUT
12 * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
13 * FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License
14 * version 2 for more details (a copy is included in the LICENSE file that
15 * accompanied this code).
16 *
17 * You should have received a copy of the GNU General Public License version
18 * 2 along with this work; if not, write to the Free Software Foundation,
19 * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.
20 *
21 * Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA
22 * or visit www.oracle.com if you need additional information or have any
23 * questions.
24 */
25
26 package org.jemmy.image.pixel;
27
28 import java.io.IOException;
29 import java.io.InputStream;
30 import java.util.Arrays;
31 import java.util.zip.DataFormatException;
32 import java.util.zip.Inflater;
33 import org.jemmy.JemmyException;
34 import org.jemmy.image.pixel.Raster.Component;
35
36 /**
37 * Allows to load PNG graphical file.
38 * @author Alexandre Iline
39 */
40 public abstract class PNGLoader {
41
42 InputStream in;
43
44 /**
45 * Constructs a PNGDecoder object.
46 * @param in input stream to read PNG image from.
47 */
48 public PNGLoader(InputStream in) {
49 this.in = in;
50 }
51
52 byte read() throws IOException {
53 byte b = (byte)in.read();
54 return(b);
55 }
56
57 int readInt() throws IOException {
58 byte b[] = read(4);
59 return(((b[0]&0xff)<<24) +
60 ((b[1]&0xff)<<16) +
61 ((b[2]&0xff)<<8) +
62 ((b[3]&0xff)));
63 }
64
65 byte[] read(int count) throws IOException {
66 byte[] result = new byte[count];
67 for(int i = 0; i < count; i++) {
68 result[i] = read();
69 }
70 return(result);
71 }
72
73 void checkEquality(byte[] b1, byte[] b2) {
74 if(!Arrays.equals(b1, b2)) {
75 throw(new JemmyException("Format error"));
76 }
77 }
78
79 /**
80 * Decodes image from an input stream passed into constructor.
81 * @return a BufferedImage object
82 * @throws IOException
83 */
84 public Raster decode() throws IOException {
85 return decode(true);
86 }
87
88 protected abstract WriteableRaster createRaster(int width, int height);
89
90 /**
91 * Decodes image from an input stream passed into constructor.
92 * @return a BufferedImage object
93 * @param closeStream requests method to close the stream after the image is read
94 * @throws IOException
95 */
96 public Raster decode(boolean closeStream) throws IOException {
97
98 byte[] id = read(12);
99 checkEquality(id, new byte[] {-119, 80, 78, 71, 13, 10, 26, 10, 0, 0, 0, 13});
100
101 byte[] ihdr = read(4);
102 checkEquality(ihdr, "IHDR".getBytes());
103
104 int width = readInt();
105 int height = readInt();
106
107 WriteableRaster result = createRaster(width, height);
108
109 byte[] head = read(5);
110 int mode;
111 if(Arrays.equals(head, new byte[]{1, 0, 0, 0, 0})) {
112 mode = PNGSaver.BW_MODE;
113 } else if(Arrays.equals(head, new byte[]{8, 0, 0, 0, 0})) {
114 mode = PNGSaver.GREYSCALE_MODE;
115 } else if(Arrays.equals(head, new byte[]{8, 2, 0, 0, 0})) {
116 mode = PNGSaver.COLOR_MODE;
117 } else {
118 throw(new JemmyException("Format error"));
119 }
120
121 readInt();//!!crc
122
123 int size = readInt();
124
125 byte[] idat = read(4);
126 checkEquality(idat, "IDAT".getBytes());
127
128 byte[] data = read(size);
129
130
131 Inflater inflater = new Inflater();
132 inflater.setInput(data, 0, size);
133
134 int[] colors = new int[3];
135 int[] black = new int[] {0, 0, 0};
136 int[] white = new int[] {1, 1, 1};
137
138 try {
139 switch (mode) {
140 case PNGSaver.BW_MODE:
141 {
142 int bytes = (int)(width / 8);
143 if((width % 8) != 0) {
144 bytes++;
145 }
146 byte colorset;
147 byte[] row = new byte[bytes];
148 for (int y = 0; y < height; y++) {
149 inflater.inflate(new byte[1]);
150 inflater.inflate(row);
151 for (int x = 0; x < bytes; x++) {
152 colorset = row[x];
153 for (int sh = 0; sh < 8; sh++) {
154 if(x * 8 + sh >= width) {
155 break;
156 }
157 if((colorset & 0x80) == 0x80) {
158 setColors(result, x * 8 + sh, y, white);
159 } else {
160 setColors(result, x * 8 + sh, y, black);
161 }
162 colorset <<= 1;
163 }
164 }
165 }
166 }
167 break;
168 case PNGSaver.GREYSCALE_MODE:
169 {
170 byte[] row = new byte[width];
171 for (int y = 0; y < height; y++) {
172 inflater.inflate(new byte[1]);
173 inflater.inflate(row);
174 for (int x = 0; x < width; x++) {
175 colors[0] = row[x];
176 colors[1] = colors[0];
177 colors[2] = colors[0];
178 setColors(result, x, y, colors);
179 }
180 }
181 }
182 break;
183 case PNGSaver.COLOR_MODE:
184 {
185 byte[] row = new byte[width * 3];
186 for (int y = 0; y < height; y++) {
187 inflater.inflate(new byte[1]);
188 inflater.inflate(row);
189 for (int x = 0; x < width; x++) {
190 colors[0] = (row[x * 3 + 0]&0xff);
191 colors[1] = (row[x * 3 + 1]&0xff);
192 colors[2] = (row[x * 3 + 2]&0xff);
193 setColors(result, x, y, colors);
194 }
195 }
196 }
197 }
198 } catch(DataFormatException e) {
199 throw(new JemmyException("ZIP error", e));
200 }
201
202 readInt();//!!crc
203 readInt();//0
204
205 byte[] iend = read(4);
206 checkEquality(iend, "IEND".getBytes());
207
208 readInt();//!!crc
209 if (closeStream) {
210 in.close();
211 }
212
213 return(result);
214 }
215
216 private void setColors(WriteableRaster raster, int x, int y, int[] colors) {
217 Component[] supported = raster.getSupported();
218 double[] imageColors = new double[supported.length];
219 for (int i = 0; i < supported.length; i++) {
220 if(supported[i] == Component.ALPHA) {
221 imageColors[i] = 1;
222 } else {
223 imageColors[i] = (double)colors[
224 PixelImageComparator.arrayIndexOf(PNGSaver.RGB, supported[i])]/0xFF;
225 }
226 }
227 raster.setColors(x, y, imageColors);
228 }
229
230 }