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1
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1 /* ImageLoaderDocuImage -- Image class implementation using JDK 1.4 ImageLoader
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2
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3 Digital Image Library servlet components
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4
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5 Copyright (C) 2002, 2003 Robert Casties (robcast@mail.berlios.de)
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6
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7 This program is free software; you can redistribute it and/or modify it
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8 under the terms of the GNU General Public License as published by the
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9 Free Software Foundation; either version 2 of the License, or (at your
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10 option) any later version.
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11
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12 Please read license.txt for the full details. A copy of the GPL
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13 may be found at http://www.gnu.org/copyleft/lgpl.html
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14
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15 You should have received a copy of the GNU General Public License
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16 along with this program; if not, write to the Free Software
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17 Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
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18 */
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1
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19
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20 package digilib.image;
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21
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290
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22 import java.awt.Rectangle;
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23 import java.awt.RenderingHints;
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24 import java.awt.geom.AffineTransform;
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25 import java.awt.geom.Rectangle2D;
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26 import java.awt.image.AffineTransformOp;
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27 import java.awt.image.BufferedImage;
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28 import java.awt.image.ConvolveOp;
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29 import java.awt.image.Kernel;
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30 import java.awt.image.RescaleOp;
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31 import java.io.File;
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32 import java.io.IOException;
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33 import java.io.OutputStream;
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34 import java.io.RandomAccessFile;
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35 import java.util.Iterator;
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1
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36
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290
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37 import javax.imageio.ImageIO;
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38 import javax.imageio.ImageReadParam;
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39 import javax.imageio.ImageReader;
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40 import javax.imageio.stream.FileImageInputStream;
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41 import javax.imageio.stream.ImageInputStream;
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1
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42
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290
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43 import digilib.io.FileOpException;
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44 import digilib.io.ImageFile;
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45
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290
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46 /** Implementation of DocuImage using the ImageLoader API of Java 1.4 and Java2D. */
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1
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47 public class ImageLoaderDocuImage extends DocuImageImpl {
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48
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290
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49 /** image object */
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50 protected BufferedImage img;
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51
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52 /** interpolation type */
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53 protected RenderingHints renderHint;
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54
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55 /** ImageIO image reader */
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56 protected ImageReader reader;
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57
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58 /** File that was read */
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59 protected File imgFile;
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60
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61 /* loadSubimage is supported. */
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62 public boolean isSubimageSupported() {
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63 return true;
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64 }
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65
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66 public void setQuality(int qual) {
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67 quality = qual;
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68 renderHint = new RenderingHints(null);
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69 //hint.put(RenderingHints.KEY_ANTIALIASING,
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70 // RenderingHints.VALUE_ANTIALIAS_OFF);
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71 // setup interpolation quality
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72 if (qual > 0) {
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73 logger.debug("quality q1");
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74 renderHint.put(RenderingHints.KEY_INTERPOLATION,
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75 RenderingHints.VALUE_INTERPOLATION_BICUBIC);
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76 } else {
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77 logger.debug("quality q0");
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78 renderHint.put(RenderingHints.KEY_INTERPOLATION,
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79 RenderingHints.VALUE_INTERPOLATION_NEAREST_NEIGHBOR);
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80 }
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81 }
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82
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290
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83 public int getHeight() {
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84 int h = 0;
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85 try {
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86 if (img == null) {
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87 h = reader.getHeight(0);
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88 } else {
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89 h = img.getHeight();
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90 }
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91 } catch (IOException e) {
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92 logger.debug("error in getHeight", e);
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93 }
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94 return h;
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95 }
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96
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290
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97 public int getWidth() {
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98 int w = 0;
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99 try {
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100 if (img == null) {
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101 w = reader.getWidth(0);
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102 } else {
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103 w = img.getWidth();
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104 }
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105 } catch (IOException e) {
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106 logger.debug("error in getHeight", e);
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107 }
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108 return w;
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109 }
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110
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111 /* load image file */
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112 public void loadImage(ImageFile f) throws FileOpException {
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113 logger.debug("loadImage " + f.getFile());
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114 //System.gc();
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115 try {
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116 img = ImageIO.read(f.getFile());
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117 if (img == null) {
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118 throw new FileOpException("Unable to load File!");
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119 }
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120 } catch (IOException e) {
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121 throw new FileOpException("Error reading image.");
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122 }
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123 }
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124
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290
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125 /**
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126 * Get an ImageReader for the image file.
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127 *
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128 * @return
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129 */
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130 public ImageReader getReader(ImageFile f) throws IOException {
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131 logger.debug("preloadImage " + f.getFile());
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132 if (reader != null) {
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133 logger.debug("Reader was not null!");
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134 // clean up old reader
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135 dispose();
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136 }
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137 //System.gc();
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138 RandomAccessFile rf = new RandomAccessFile(f.getFile(), "r");
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139 ImageInputStream istream = new FileImageInputStream(rf);
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140 //Iterator readers = ImageIO.getImageReaders(istream);
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141 String mt = f.getMimetype();
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142 logger.debug("File type:" + mt);
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143 Iterator readers = ImageIO.getImageReadersByMIMEType(mt);
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144 if (!readers.hasNext()) {
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145 throw new FileOpException("Unable to load File!");
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146 }
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147 reader = (ImageReader) readers.next();
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148 /* are there more readers? */
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149 logger.debug("ImageIO: this reader: " + reader.getClass());
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150 while (readers.hasNext()) {
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151 logger.debug("ImageIO: next reader: " + readers.next().getClass());
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152 }
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153 //*/
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154 reader.setInput(istream);
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155 imgFile = f.getFile();
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156 return reader;
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157 }
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158
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159 /* Load an image file into the Object. */
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160 public void loadSubimage(ImageFile f, Rectangle region, int prescale)
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161 throws FileOpException {
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162 logger.debug("loadSubimage");
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163 //System.gc();
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164 try {
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165 if ((reader == null) || (imgFile != f.getFile())) {
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166 getReader(f);
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167 }
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168 // set up reader parameters
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169 ImageReadParam readParam = reader.getDefaultReadParam();
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170 readParam.setSourceRegion(region);
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171 if (prescale > 1) {
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172 readParam.setSourceSubsampling(prescale, prescale, 0, 0);
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173 }
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174 // read image
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175 logger.debug("loading..");
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176 img = reader.read(0, readParam);
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177 logger.debug("loaded");
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178 } catch (IOException e) {
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179 throw new FileOpException("Unable to load File!");
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180 }
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181 if (img == null) {
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182 throw new FileOpException("Unable to load File!");
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183 }
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184 }
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185
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186 /* write image of type mt to Stream */
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187 public void writeImage(String mt, OutputStream ostream)
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188 throws FileOpException {
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189 logger.debug("writeImage");
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190 try {
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191 // setup output
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192 String type = "png";
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193 if (mt == "image/jpeg") {
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194 type = "jpeg";
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195 } else if (mt == "image/png") {
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196 type = "png";
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197 } else {
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198 // unknown mime type
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199 throw new FileOpException("Unknown mime type: " + mt);
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200 }
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201
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202 /*
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203 * JPEG doesn't do transparency so we have to convert any RGBA image
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204 * to RGB :-( *Java2D BUG*
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205 */
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206 if ((type == "jpeg") && (img.getColorModel().hasAlpha())) {
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207 logger.debug("BARF: JPEG with transparency!!");
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208 int w = img.getWidth();
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209 int h = img.getHeight();
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210 // BufferedImage.TYPE_INT_RGB seems to be fastest (JDK1.4.1,
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211 // OSX)
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212 int destType = BufferedImage.TYPE_INT_RGB;
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213 BufferedImage img2 = new BufferedImage(w, h, destType);
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214 img2.createGraphics().drawImage(img, null, 0, 0);
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215 img = img2;
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216 }
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217
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218 // render output
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219 logger.debug("writing");
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220 if (ImageIO.write(img, type, ostream)) {
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221 // writing was OK
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222 return;
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223 } else {
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224 throw new FileOpException(
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225 "Error writing image: Unknown image format!");
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226 }
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227 } catch (IOException e) {
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228 throw new FileOpException("Error writing image.");
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229 }
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230 }
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1
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231
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290
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232 public void scale(double scale, double scaleY) throws ImageOpException {
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233 logger.debug("scale");
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234 /* for downscaling in high quality the image is blurred first */
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235 if ((scale <= 0.5) && (quality > 1)) {
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236 int bl = (int) Math.floor(1 / scale);
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237 blur(bl);
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238 }
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239 /* then scaled */
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240 AffineTransformOp scaleOp = new AffineTransformOp(AffineTransform
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241 .getScaleInstance(scale, scale), renderHint);
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242 BufferedImage scaledImg = null;
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243 // enforce destination image type (*Java2D BUG*)
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244 int type = img.getType();
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245 // FIXME: which type would be best?
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246 if ((quality > 0) && (type != 0)) {
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247 logger.debug("creating destination image");
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248 Rectangle2D dstBounds = scaleOp.getBounds2D(img);
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249 scaledImg = new BufferedImage((int) dstBounds.getWidth(),
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250 (int) dstBounds.getHeight(), type);
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251 }
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252 logger.debug("scaling...");
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253 scaledImg = scaleOp.filter(img, scaledImg);
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254 logger.debug("destination image type " + scaledImg.getType());
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255 if (scaledImg == null) {
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256 throw new ImageOpException("Unable to scale");
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257 }
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258 //DEBUG
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259 logger.debug("SCALE: " + scale + " ->" + scaledImg.getWidth() + "x"
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260 + scaledImg.getHeight());
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261 img = scaledImg;
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262 scaledImg = null;
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263 }
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1
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264
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290
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265 public void blur(int radius) throws ImageOpException {
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266 //DEBUG
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267 logger.debug("blur: " + radius);
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268 // minimum radius is 2
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269 int klen = Math.max(radius, 2);
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270 // FIXME: use constant kernels for most common sizes
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271 int ksize = klen * klen;
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272 // kernel is constant 1/k
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273 float f = 1f / ksize;
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274 float[] kern = new float[ksize];
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275 for (int i = 0; i < ksize; i++) {
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276 kern[i] = f;
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277 }
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278 Kernel blur = new Kernel(klen, klen, kern);
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279 // blur with convolve operation
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280 ConvolveOp blurOp = new ConvolveOp(blur, ConvolveOp.EDGE_NO_OP,
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281 renderHint);
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282 // blur needs explicit destination image type for color *Java2D BUG*
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283 BufferedImage blurredImg = null;
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284 if (img.getType() == BufferedImage.TYPE_3BYTE_BGR) {
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285 blurredImg = new BufferedImage(img.getWidth(), img.getHeight(), img
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286 .getType());
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287 }
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288 blurredImg = blurOp.filter(img, blurredImg);
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289 if (blurredImg == null) {
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290 throw new ImageOpException("Unable to scale");
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291 }
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292 img = blurredImg;
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293 }
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294
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295 public void crop(int x_off, int y_off, int width, int height)
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296 throws ImageOpException {
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297 // setup Crop
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298 BufferedImage croppedImg = img.getSubimage(x_off, y_off, width, height);
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299 logger.debug("CROP:" + croppedImg.getWidth() + "x"
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300 + croppedImg.getHeight());
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301 //DEBUG
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302 // util.dprintln(2, " time
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303 // "+(System.currentTimeMillis()-startTime)+"ms");
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304 if (croppedImg == null) {
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305 throw new ImageOpException("Unable to crop");
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306 }
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307 img = croppedImg;
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308 }
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309
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310 public void enhance(float mult, float add) throws ImageOpException {
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311 /*
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312 * Only one constant should work regardless of the number of bands
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313 * according to the JDK spec. Doesn't work on JDK 1.4 for OSX and Linux
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314 * (at least). RescaleOp scaleOp = new RescaleOp( (float)mult,
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315 * (float)add, null); scaleOp.filter(img, img);
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316 */
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317
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318 /* The number of constants must match the number of bands in the image. */
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319 int ncol = img.getColorModel().getNumComponents();
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320 float[] dm = new float[ncol];
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321 float[] da = new float[ncol];
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322 for (int i = 0; i < ncol; i++) {
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323 dm[i] = (float) mult;
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324 da[i] = (float) add;
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325 }
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326 RescaleOp scaleOp = new RescaleOp(dm, da, null);
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327 scaleOp.filter(img, img);
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328 }
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329
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330 public void enhanceRGB(float[] rgbm, float[] rgba) throws ImageOpException {
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331
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332 /*
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333 * The number of constants must match the number of bands in the image.
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334 * We do only 3 (RGB) bands.
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335 */
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336
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337 int ncol = img.getColorModel().getNumColorComponents();
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338 if ((ncol != 3) || (rgbm.length != 3) || (rgba.length != 3)) {
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339 logger
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340 .debug("ERROR(enhance): unknown number of color bands or coefficients ("
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341 + ncol + ")");
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342 return;
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343 }
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344 RescaleOp scaleOp = new RescaleOp(rgbOrdered(rgbm), rgbOrdered(rgba),
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345 null);
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346 scaleOp.filter(img, img);
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347 }
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1
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348
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290
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349 /**
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350 * Ensures that the array f is in the right order to map the images RGB
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351 * components. (not shure what happens
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352 */
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353 public float[] rgbOrdered(float[] fa) {
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354 /*
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355 * TODO: this is UGLY, UGLY!!
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356 */
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357 float[] fb;
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358 int t = img.getType();
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359 if (img.getColorModel().hasAlpha()) {
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360 fb = new float[4];
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361 if ((t == BufferedImage.TYPE_INT_ARGB)
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362 || (t == BufferedImage.TYPE_INT_ARGB_PRE)) {
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363 // RGB Type
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364 fb[0] = fa[0];
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365 fb[1] = fa[1];
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366 fb[2] = fa[2];
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367 fb[3] = 1f;
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368 } else {
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369 // this isn't tested :-(
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370 fb[0] = 1f;
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371 fb[1] = fa[0];
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372 fb[2] = fa[1];
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373 fb[3] = fa[2];
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374 }
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375 } else {
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376 fb = new float[3];
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377 if (t == BufferedImage.TYPE_3BYTE_BGR) {
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378 // BGR Type (actually it looks like RBG...)
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379 fb[0] = fa[0];
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380 fb[1] = fa[2];
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381 fb[2] = fa[1];
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382 } else {
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383 fb[0] = fa[0];
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384 fb[1] = fa[1];
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385 fb[2] = fa[2];
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386 }
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387 }
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388 return fb;
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389 }
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1
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390
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290
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391 public void rotate(double angle) throws ImageOpException {
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392 // setup rotation
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393 double rangle = Math.toRadians(angle);
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394 // create offset to make shure the rotated image has no negative
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395 // coordinates
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396 double w = img.getWidth();
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397 double h = img.getHeight();
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398 AffineTransform trafo = new AffineTransform();
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399 // center of rotation
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400 double x = (w / 2);
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401 double y = (h / 2);
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402 trafo.rotate(rangle, x, y);
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403 // try rotation to see how far we're out of bounds
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404 AffineTransformOp rotOp = new AffineTransformOp(trafo, renderHint);
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405 Rectangle2D rotbounds = rotOp.getBounds2D(img);
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406 double xoff = rotbounds.getX();
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407 double yoff = rotbounds.getY();
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408 // move image back in line
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409 trafo
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410 .preConcatenate(AffineTransform.getTranslateInstance(-xoff,
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411 -yoff));
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412 // transform image
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413 rotOp = new AffineTransformOp(trafo, renderHint);
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414 BufferedImage rotImg = rotOp.filter(img, null);
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415 // calculate new bounding box
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416 //Rectangle2D bounds = rotOp.getBounds2D(img);
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417 if (rotImg == null) {
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418 throw new ImageOpException("Unable to rotate");
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419 }
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420 img = rotImg;
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421 // crop new image (with self-made rounding)
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422 /*
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423 * img = rotImg.getSubimage( (int) (bounds.getX()+0.5), (int)
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424 * (bounds.getY()+0.5), (int) (bounds.getWidth()+0.5), (int)
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425 * (bounds.getHeight()+0.5));
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426 */
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427 }
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1
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428
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290
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429 public void mirror(double angle) throws ImageOpException {
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430 // setup mirror
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431 double mx = 1;
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432 double my = 1;
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433 double tx = 0;
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434 double ty = 0;
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435 if (Math.abs(angle - 0) < epsilon) { // 0 degree
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436 mx = -1;
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437 tx = getWidth();
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438 } else if (Math.abs(angle - 90) < epsilon) { // 90 degree
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439 my = -1;
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440 ty = getHeight();
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441 } else if (Math.abs(angle - 180) < epsilon) { // 180 degree
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442 mx = -1;
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443 tx = getWidth();
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444 } else if (Math.abs(angle - 270) < epsilon) { // 270 degree
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445 my = -1;
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446 ty = getHeight();
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447 } else if (Math.abs(angle - 360) < epsilon) { // 360 degree
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448 mx = -1;
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449 tx = getWidth();
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450 }
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451 AffineTransformOp mirOp = new AffineTransformOp(new AffineTransform(mx,
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452 0, 0, my, tx, ty), renderHint);
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453 BufferedImage mirImg = mirOp.filter(img, null);
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454 if (mirImg == null) {
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455 throw new ImageOpException("Unable to mirror");
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456 }
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457 img = mirImg;
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|
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458 }
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1
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459
|
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290
|
460 /*
|
|
|
461 * (non-Javadoc)
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462 *
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|
463 * @see java.lang.Object#finalize()
|
|
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464 */
|
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465 protected void finalize() throws Throwable {
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466 dispose();
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|
467 super.finalize();
|
|
|
468 }
|
|
|
469
|
|
|
470 public void dispose() {
|
|
|
471 // we must dispose the ImageReader because it keeps the filehandle
|
|
|
472 // open!
|
|
|
473 if (reader != null) {
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|
|
474 reader.dispose();
|
|
|
475 reader = null;
|
|
|
476 }
|
|
|
477 img = null;
|
|
|
478 }
|
|
1
|
479
|
|
|
480 }
|
