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 package org.jemmy.image.awt; 26 27 import java.awt.Color; 28 29 import java.awt.image.BufferedImage; 30 31 import java.io.InputStream; 32 import java.io.IOException; 33 import java.io.FileInputStream; 34 35 import org.jemmy.JemmyException; 36 37 import java.util.zip.DataFormatException; 38 import java.util.zip.Inflater; 39 40 /** 41 * Allows to load PNG graphical file. 42 * @author Alexandre Iline 43 */ 44 public class PNGDecoder extends Object { 45 46 InputStream in; 47 48 /** 49 * Constructs a PNGDecoder object. 50 * @param in input stream to read PNG image from. 51 */ 52 public PNGDecoder(InputStream in) { 53 this.in = in; 54 } 55 56 byte read() throws IOException { 57 byte b = (byte)in.read(); 58 return(b); 59 } 60 61 int readInt() throws IOException { 62 byte b[] = read(4); 63 return(((b[0]&0xff)<<24) + 64 ((b[1]&0xff)<<16) + 65 ((b[2]&0xff)<<8) + 66 ((b[3]&0xff))); 67 } 68 69 byte[] read(int count) throws IOException { 70 byte[] result = new byte[count]; 71 for(int i = 0; i < count; i++) { 72 result[i] = read(); 73 } 74 return(result); 75 } 76 77 boolean compare(byte[] b1, byte[] b2) { 78 if(b1.length != b2.length) { 79 return(false); 80 } 81 for(int i = 0; i < b1.length; i++) { 82 if(b1[i] != b2[i]) { 83 return(false); 84 } 85 } 86 return(true); 87 } 88 89 void checkEquality(byte[] b1, byte[] b2) { 90 if(!compare(b1, b2)) { 91 throw(new JemmyException("Format error")); 92 } 93 } 94 95 /** 96 * Decodes image from an input stream passed into constructor. 97 * @return a BufferedImage object 98 * @throws IOException todo document 99 */ 100 public BufferedImage decode() throws IOException { 101 return decode(true); 102 } 103 104 /** 105 * Decodes image from an input stream passed into constructor. 106 * @return a BufferedImage object 107 * @param closeStream requests method to close the stream after the image is read 108 * @throws IOException todo document 109 */ 110 public BufferedImage decode(boolean closeStream) throws IOException { 111 112 byte[] id = read(12); 113 checkEquality(id, new byte[] {-119, 80, 78, 71, 13, 10, 26, 10, 0, 0, 0, 13}); 114 115 byte[] ihdr = read(4); 116 checkEquality(ihdr, "IHDR".getBytes()); 117 118 int width = readInt(); 119 int height = readInt(); 120 121 BufferedImage result = new BufferedImage(width, height, BufferedImage.TYPE_INT_RGB); 122 123 byte[] head = read(5); 124 int mode; 125 if(compare(head, new byte[]{1, 0, 0, 0, 0})) { 126 mode = PNGEncoder.BW_MODE; 127 } else if(compare(head, new byte[]{8, 0, 0, 0, 0})) { 128 mode = PNGEncoder.GREYSCALE_MODE; 129 } else if(compare(head, new byte[]{8, 2, 0, 0, 0})) { 130 mode = PNGEncoder.COLOR_MODE; 131 } else { 132 throw(new JemmyException("Format error")); 133 } 134 135 readInt();//!!crc 136 137 int size = readInt(); 138 139 byte[] idat = read(4); 140 checkEquality(idat, "IDAT".getBytes()); 141 142 byte[] data = read(size); 143 144 145 Inflater inflater = new Inflater(); 146 inflater.setInput(data, 0, size); 147 148 int color; 149 150 try { 151 switch (mode) { 152 case PNGEncoder.BW_MODE: 153 { 154 int bytes = (int)(width / 8); 155 if((width % 8) != 0) { 156 bytes++; 157 } 158 byte colorset; 159 byte[] row = new byte[bytes]; 160 for (int y = 0; y < height; y++) { 161 inflater.inflate(new byte[1]); 162 inflater.inflate(row); 163 for (int x = 0; x < bytes; x++) { 164 colorset = row[x]; 165 for (int sh = 0; sh < 8; sh++) { 166 if(x * 8 + sh >= width) { 167 break; 168 } 169 if((colorset & 0x80) == 0x80) { 170 result.setRGB(x * 8 + sh, y, Color.white.getRGB()); 171 } else { 172 result.setRGB(x * 8 + sh, y, Color.black.getRGB()); 173 } 174 colorset <<= 1; 175 } 176 } 177 } 178 } 179 break; 180 case PNGEncoder.GREYSCALE_MODE: 181 { 182 byte[] row = new byte[width]; 183 for (int y = 0; y < height; y++) { 184 inflater.inflate(new byte[1]); 185 inflater.inflate(row); 186 for (int x = 0; x < width; x++) { 187 color = row[x]; 188 result.setRGB(x, y, (color << 16) + (color << 8) + color); 189 } 190 } 191 } 192 break; 193 case PNGEncoder.COLOR_MODE: 194 { 195 byte[] row = new byte[width * 3]; 196 for (int y = 0; y < height; y++) { 197 inflater.inflate(new byte[1]); 198 inflater.inflate(row); 199 for (int x = 0; x < width; x++) { 200 result.setRGB(x, y, 201 ((row[x * 3 + 0]&0xff) << 16) + 202 ((row[x * 3 + 1]&0xff) << 8) + 203 ((row[x * 3 + 2]&0xff))); 204 } 205 } 206 } 207 } 208 } catch(DataFormatException e) { 209 throw(new JemmyException("ZIP error", e)); 210 } 211 212 readInt();//!!crc 213 readInt();//0 214 215 byte[] iend = read(4); 216 checkEquality(iend, "IEND".getBytes()); 217 218 readInt();//!!crc 219 if (closeStream) { 220 in.close(); 221 } 222 223 return(result); 224 } 225 226 /** 227 * Decodes image from file. 228 * @param fileName a file to read image from 229 * @return a BufferedImage instance. 230 */ 231 public static BufferedImage decode(String fileName) { 232 try { 233 return(new PNGDecoder(new FileInputStream(fileName)).decode()); 234 } catch(IOException e) { 235 throw(new JemmyException("IOException during image reading", e)); 236 } 237 } 238 239 /** 240 * Decodes image from input stream 241 * @param inputStream a file to read image from 242 * @param closeStream requests method to close the stream after the image is read 243 * @return a BufferedImage instance. 244 */ 245 public static BufferedImage decode(InputStream inputStream, boolean closeStream) { 246 try { 247 return(new PNGDecoder(inputStream).decode(closeStream)); 248 } catch(IOException e) { 249 throw(new JemmyException("IOException during image reading", e)); 250 } 251 } 252 253 /** 254 * Decodes image from resource. 255 * @param loader ClassLoader to use to get the resource 256 * @param resource Image resource name 257 * @return a BufferedImage instance. 258 */ 259 public static BufferedImage decode(ClassLoader loader, String resource) { 260 try { 261 InputStream resourceStream = loader.getResourceAsStream(resource); 262 if (resourceStream == null) { 263 throw new JemmyException("Resouce '" + resource + "' could not be found!"); 264 } 265 return(new PNGDecoder(resourceStream).decode()); 266 } catch(IOException e) { 267 throw(new JemmyException("IOException during image reading", e)); 268 } 269 } 270 271 }