Mercurial > hg > digilib-old

annotate common-jai/src/main/java/digilib/image/JAIImageLoaderDocuImage.java @ 1110:ffda96c2fde0

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author hertzhaft
date Sun, 28 Oct 2012 15:10:41 +0100
parents b2d97b842612
children
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b2d97b842612 moved DocuImage implementations with non-standard toolkits (JAI, ImgeJ) into separate Maven modules.
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1 /* JAIImageLoaderDocuImage -- Image class implementation using JAI's ImageLoader Plugin
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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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19 */
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20
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21 package digilib.image;
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22
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23 import java.awt.Image;
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24 import java.awt.Rectangle;
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25 import java.awt.image.renderable.ParameterBlock;
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26 import java.io.File;
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27 import java.io.IOException;
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28 import java.io.OutputStream;
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29 import java.io.RandomAccessFile;
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30 import java.util.Iterator;
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31
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32 import javax.imageio.ImageIO;
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33 import javax.imageio.ImageReadParam;
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34 import javax.imageio.ImageReader;
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35 import javax.imageio.stream.FileImageInputStream;
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36 import javax.imageio.stream.ImageInputStream;
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37 import javax.media.jai.JAI;
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38
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39 import digilib.io.FileOpException;
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40 import digilib.io.ImageInput;
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41 import digilib.util.ImageSize;
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42
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43 /** DocuImage implementation using the Java Advanced Imaging API and the ImageLoader
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44 * API of Java 1.4.
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45 */
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46 public class JAIImageLoaderDocuImage extends JAIDocuImage {
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47
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48 /** ImageIO image reader */
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49 protected ImageReader reader;
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50 /** current image file */
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51 protected File imgFile;
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52
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53 /* loadSubimage is supported. */
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54 public boolean isSubimageSupported() {
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55 return true;
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56 }
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57
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58 /* returns the size of the current image */
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59 public ImageSize getSize() {
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60 ImageSize is = null;
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61 // TODO: can we cache imageSize?
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62 int h = 0;
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63 int w = 0;
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64 try {
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65 if (img == null) {
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66 // get size from ImageReader
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67 h = reader.getHeight(0);
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68 w = reader.getWidth(0);
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69 } else {
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70 // get size from image
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71 h = img.getHeight();
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72 w = img.getWidth();
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73 }
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74 is = new ImageSize(w, h);
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75 } catch (IOException e) {
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76 logger.debug("error in getSize:", e);
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77 }
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78 return is;
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79 }
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80
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81
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82 /* Load an image file into the Object. */
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83 public void loadImage(ImageInput ii) throws FileOpException {
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84 logger.debug("loadImage: "+ii);
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85 if (ii.hasImageInputStream()) {
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86 img = JAI.create("ImageRead", ii.getImageInputStream());
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87 } else if (ii.hasFile()) {
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88 img = JAI.create("ImageRead", ii.getFile().getAbsolutePath());
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89 }
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90 if (img == null) {
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91 throw new FileOpException("Unable to load File!");
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92 }
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93 }
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94
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95 /* Get an ImageReader for the image file. */
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96 public ImageReader getReader(ImageInput input) throws IOException {
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97 logger.debug("get ImageReader for " + input);
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98 if (this.reader != null) {
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99 if (this.input == input) {
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100 // it was the same input
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101 logger.debug("reusing Reader");
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102 return reader;
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103 }
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104 // clean up old reader
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105 logger.debug("cleaning Reader!");
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106 dispose();
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107 }
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108 this.input = input;
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109 ImageInputStream istream = null;
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110 if (input.hasImageInputStream()) {
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111 // stream input
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112 istream = input.getImageInputStream();
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113 } else if (input.hasFile()) {
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114 // file only input
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115 RandomAccessFile rf = new RandomAccessFile(input.getFile(), "r");
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116 istream = new FileImageInputStream(rf);
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117 } else {
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118 throw new FileOpException("Unable to get data from ImageInput");
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119 }
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120 Iterator<ImageReader> readers;
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121 String mt = input.getMimetype();
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122 if (mt == null) {
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123 logger.debug("No mime-type. Trying automagic.");
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124 readers = ImageIO.getImageReaders(istream);
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125 } else {
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126 logger.debug("File type:" + mt);
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127 readers = ImageIO.getImageReadersByMIMEType(mt);
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128 }
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129 if (!readers.hasNext()) {
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130 throw new FileOpException("Can't find Reader to load File!");
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131 }
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132 reader = readers.next();
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133 logger.debug("ImageIO: this reader: " + reader.getClass());
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134 /* are there more readers? */
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135 /* while (readers.hasNext()) {
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136 logger.debug("ImageIO: next reader: " + readers.next().getClass());
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137 } */
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138 reader.setInput(istream);
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139 return reader;
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140 }
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141
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142 /* Load an image file into the Object. */
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143 public void loadSubimage(ImageInput ii, Rectangle region, int prescale)
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144 throws FileOpException {
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145 logger.debug("loadSubimage: "+ii.getFile());
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146 //System.gc();
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147 try {
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148 if ((reader == null) || (imgFile != ii.getFile())) {
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149 getReader(ii);
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150 }
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151 ImageReadParam readParam = reader.getDefaultReadParam();
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152 readParam.setSourceRegion(region);
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153 readParam.setSourceSubsampling(prescale, prescale, 0, 0);
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154 img = reader.read(0, readParam);
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155 /* JAI imageread seems to ignore the readParam :-(
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156 ImageInputStream istream = (ImageInputStream) reader.getInput();
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157 ParameterBlockJAI pb = new ParameterBlockJAI("imageread");
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158 pb.setParameter("Input", istream);
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159 pb.setParameter("ReadParam", readParam);
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160 pb.setParameter("Reader", reader);
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161 img = JAI.create("imageread", pb);
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162 */
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163 } catch (IOException e) {
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164 throw new FileOpException("Unable to load File!");
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165 }
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166 if (img == null) {
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167 throw new FileOpException("Unable to load File!");
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168 }
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169 imgFile = ii.getFile();
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170 }
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171
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172
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173 /* Write the current image to an OutputStream. */
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174 public void writeImage(String mt, OutputStream ostream)
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175 throws ImageOpException, FileOpException {
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176 logger.debug("writeImage");
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177 try {
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178 // setup output
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179 ParameterBlock pb3 = new ParameterBlock();
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180 pb3.addSource(img);
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181 pb3.add(ostream);
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182 if (mt == "image/jpeg") {
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183 pb3.add("JPEG");
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184 } else if (mt == "image/png") {
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185 pb3.add("PNG");
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186 } else {
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187 // unknown mime type
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188 throw new ImageOpException("Unknown mime type: " + mt);
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189 }
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190 // render output
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191 JAI.create("ImageWrite", pb3);
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192 } catch (RuntimeException e) {
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193 throw new FileOpException("Error writing image.");
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194 }
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195 }
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196
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197 @Override
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198 public Image getAwtImage() {
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199 // TODO Auto-generated method stub
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200 return (Image) img;
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201 }
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202
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203 /* (non-Javadoc)
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204 * @see java.lang.Object#finalize()
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205 */
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206 protected void finalize() throws Throwable {
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207 dispose();
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208 super.finalize();
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209 }
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210
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211 public void dispose() {
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212 // we must dispose the ImageReader because it keeps the filehandle open!
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213 reader.dispose();
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214 reader = null;
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215 img = null;
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216 }
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217
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218 }