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annotate servlet/src/digilib/image/DocuImageImpl.java @ 562:baaa5bab5e16 digilibPDF

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trying to reduce use of ImageOps
author robcast
date Fri, 17 Dec 2010 16:24:03 +0100
parents a5168978555f
children 4c51d71aef13
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1 /* DocuImage -- General image interface class implementation
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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) 2001, 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.io.File;
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26 import java.io.IOException;
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27 import java.io.OutputStream;
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28 import java.io.RandomAccessFile;
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29 import java.util.Iterator;
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30 import java.util.LinkedList;
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31 import java.util.List;
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32
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33 import org.apache.log4j.Logger;
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34 import org.marcoschmidt.image.ImageInfo;
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35
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36 import digilib.io.FileOpException;
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37 import digilib.io.ImageFile;
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38
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39 /** Simple abstract implementation of the <code>DocuImage</code> interface.
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40 *
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41 * This implementation provides basic functionality for the utility methods like
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42 * <code>getKnownFileTypes</code>. Image methods like
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43 * <code>loadImage</code>, <code>writeImage</code>, <code>getWidth</code>,
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44 * <code>getHeight</code>, <code>crop</code> and <code>scale</code> must be
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45 * implemented by derived classes.
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46 */
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47 public abstract class DocuImageImpl implements DocuImage {
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48
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49 /** logger */
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50 protected static final Logger logger = Logger.getLogger(DocuImage.class);
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51
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52 /** Interpolation quality. */
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53 protected int quality = 0;
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54
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55 /** epsilon for float comparisons. */
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56 public final double epsilon = 1e-5;
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57
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58 /** image mime-type */
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59 protected String mimeType = null;
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60
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61 /**
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62 * Returns the quality.
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63 * @return int
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64 */
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65 public int getQuality() {
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66 return quality;
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67 }
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69 /**
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70 * Sets the quality.
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71 * @param quality The quality to set
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72 */
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73 public void setQuality(int quality) {
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74 this.quality = quality;
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75 }
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76
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77 /** Check image size and type and store in ImageFile f */
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78 public ImageFile identify(ImageFile imgf) throws IOException {
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79 // fileset to store the information
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80 File f = imgf.getFile();
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81 if (f == null) {
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82 throw new IOException("File not found!");
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83 }
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84 RandomAccessFile raf = new RandomAccessFile(f, "r");
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85 // set up ImageInfo object
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86 ImageInfo iif = new ImageInfo();
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87 iif.setInput(raf);
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88 iif.setCollectComments(false);
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89 iif.setDetermineImageNumber(false);
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90 logger.debug("identifying (ImageInfo) " + f);
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91 // try with ImageInfo first
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92 if (iif.check()) {
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93 ImageSize d = new ImageSize(iif.getWidth(), iif.getHeight());
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94 imgf.setSize(d);
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95 imgf.setMimetype(iif.getMimeType());
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96 //logger.debug(" format:"+iif.getFormatName());
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97 raf.close();
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98 logger.debug("image size: " + imgf.getSize());
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99 return imgf;
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100 }
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101 return null;
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102 }
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103
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104 /** Crop and scale the current image.
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105 *
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106 * The current image is cropped to a rectangle of width, height at position
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107 * x_off, y_off. The resulting image is scaled by the factor scale using the
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108 * interpolation quality qual (0=worst).
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109 *
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110 * @param x_off X offset of the crop rectangle in pixel.
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111 * @param y_off Y offset of the crop rectangle in pixel.
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112 * @param width Width of the crop rectangle in pixel.
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113 * @param height Height of the crop rectangle in pixel.
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114 * @param scale Scaling factor.
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115 * @param qual Interpolation quality (0=worst).
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116 * @throws ImageOpException Exception thrown on any error.
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117 */
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118 public void cropAndScale(
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119 int x_off, int y_off, int width, int height, double scale, int qual)
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120 throws ImageOpException {
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121 // default implementation: first crop, then scale
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122 setQuality(qual);
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123 crop(x_off, y_off, width, height);
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124 scale(scale, scale);
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125 }
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126
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127 public String getMimetype() {
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128 return mimeType;
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129 }
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130
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131 public void rotate(double angle) throws ImageOpException {
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132 // just a do-nothing implementation
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133 }
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134
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135 public void mirror(double angle) throws ImageOpException {
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136 // just a do-nothing implementation
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137 }
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138
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139 public void enhance(float mult, float add) throws ImageOpException {
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140 // just a do-nothing implementation
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141 }
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142
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143 public boolean isSubimageSupported() {
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144 // partial loading not supported per default
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145 return false;
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146 }
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147
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148 public void loadSubimage(ImageFile f, Rectangle region, int subsample)
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149 throws FileOpException {
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150 // empty implementation
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151 }
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152
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153 public void enhanceRGB(float[] rgbm, float[] rgba)
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154 throws ImageOpException {
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155 // emtpy implementation
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156 }
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157
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158 public void dispose() {
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159 // emtpy implementation
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160 }
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161
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162 public Iterator<String> getSupportedFormats() {
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163 List<String> empty = new LinkedList<String>();
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164 return empty.iterator();
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165 }
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166
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167 public void crop(int xoff, int yoff, int width, int height)
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168 throws ImageOpException {
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169 // TODO Auto-generated method stub
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170 }
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171
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172 public Image getAwtImage() {
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173 // TODO Auto-generated method stub
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174 return null;
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175 }
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176
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177 public int getHeight() {
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178 // TODO Auto-generated method stub
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179 return 0;
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180 }
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181
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182 public int getWidth() {
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183 // TODO Auto-generated method stub
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184 return 0;
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185 }
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186
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187 public void loadImage(ImageFile f) throws FileOpException {
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188 // TODO Auto-generated method stub
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189
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190 }
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191
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192 public void scale(double scaleX, double scaleY) throws ImageOpException {
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193 // TODO Auto-generated method stub
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194
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195 }
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196
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197 public void writeImage(String mt, OutputStream ostream)
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198 throws FileOpException {
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199 // TODO Auto-generated method stub
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200 }
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201
1
0ff3ede32060 Initial revision
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202 }