Mercurial > hg > digilib-old

annotate servlet/src/digilib/image/DocuImageImpl.java @ 496:1760b19df530

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Added getImage method to ImageLoaderDocuImage; added pdf output
author cmielack
date Wed, 11 Feb 2009 16:36:58 +0100
parents 11e11fe4d680
children 5658b2e5d444
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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.RandomAccessFile;
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28 import java.util.Iterator;
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29 import java.util.LinkedList;
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30 import java.util.List;
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31
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32 import org.apache.log4j.Logger;
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33 import org.marcoschmidt.image.ImageInfo;
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34
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35 import digilib.io.FileOpException;
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36 import digilib.io.ImageFile;
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37
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38 /** Simple abstract implementation of the <code>DocuImage</code> interface.
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39 *
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40 * This implementation provides basic functionality for the utility methods like
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41 * <code>SetUtils</code>, and <code>getKnownFileTypes</code>. Image methods like
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42 * <code>loadImage</code>, <code>writeImage</code>, <code>getWidth</code>,
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43 * <code>getHeight</code>, <code>crop</code> and <code>scale</code> must be
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44 * implemented by derived classes.
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45 */
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46 public abstract class DocuImageImpl implements DocuImage {
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47
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48 /** logger */
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49 protected static final Logger logger = Logger.getLogger(DocuImage.class);
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50
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51 /** Interpolation quality. */
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52 protected int quality = 0;
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54 /** epsilon for float comparisons. */
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55 public final double epsilon = 1e-5;
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56
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57 /** image mime-type */
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58 protected String mimeType = null;
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59
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60 /**
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61 * Returns the quality.
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62 * @return int
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63 */
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64 public int getQuality() {
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65 return quality;
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66 }
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68 /**
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69 * Sets the quality.
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70 * @param quality The quality to set
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71 */
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72 public void setQuality(int quality) {
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73 this.quality = quality;
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74 }
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76 /** Check image size and type and store in ImageFile f */
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77 public boolean identify(ImageFile imgf) throws IOException {
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78 // fileset to store the information
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79 File f = imgf.getFile();
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80 if (f == null) {
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81 throw new IOException("File not found!");
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82 }
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83 RandomAccessFile raf = new RandomAccessFile(f, "r");
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84 // set up ImageInfo object
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85 ImageInfo iif = new ImageInfo();
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86 iif.setInput(raf);
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87 iif.setCollectComments(false);
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88 iif.setDetermineImageNumber(false);
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89 logger.debug("identifying (ImageInfo) " + f);
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90 // try with ImageInfo first
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91 if (iif.check()) {
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92 ImageSize d = new ImageSize(iif.getWidth(), iif.getHeight());
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93 imgf.setSize(d);
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94 imgf.setMimetype(iif.getMimeType());
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95 //logger.debug(" format:"+iif.getFormatName());
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96 raf.close();
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97 logger.debug("image size: " + imgf.getSize());
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98 return true;
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99 }
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100 return false;
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101 }
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102
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103 /** Crop and scale the current image.
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104 *
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105 * The current image is cropped to a rectangle of width, height at position
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106 * x_off, y_off. The resulting image is scaled by the factor scale using the
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107 * interpolation quality qual (0=worst).
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108 *
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109 * @param x_off X offset of the crop rectangle in pixel.
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110 * @param y_off Y offset of the crop rectangle in pixel.
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111 * @param width Width of the crop rectangle in pixel.
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112 * @param height Height of the crop rectangle in pixel.
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113 * @param scale Scaling factor.
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114 * @param qual Interpolation quality (0=worst).
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115 * @throws ImageOpException Exception thrown on any error.
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116 */
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117 public void cropAndScale(
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118 int x_off, int y_off, int width, int height, double scale, int qual)
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119 throws ImageOpException {
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120
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121 setQuality(qual);
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122 crop(x_off, y_off, width, height);
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123 scale(scale, scale);
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124 }
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125
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126 public String getMimetype() {
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127 return mimeType;
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128 }
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129
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130 public void rotate(double angle) throws ImageOpException {
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131 // just a do-nothing implementation
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132 }
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133
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134 public void mirror(double angle) throws ImageOpException {
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135 // just a do-nothing implementation
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136 }
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137
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138 public void enhance(float mult, float add) throws ImageOpException {
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139 // just a do-nothing implementation
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140 }
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141
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142 public boolean isSubimageSupported() {
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143 // partial loading not supported per default
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144 return false;
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145 }
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146
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147 public void loadSubimage(ImageFile f, Rectangle region, int subsample)
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148 throws FileOpException {
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149 // empty implementation
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150 }
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151
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152 public void enhanceRGB(float[] rgbm, float[] rgba)
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153 throws ImageOpException {
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154 // emtpy implementation
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155 }
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156
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157 public void dispose() {
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158 // emtpy implementation
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159 }
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160
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161 public Iterator getSupportedFormats() {
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162 List empty = new LinkedList();
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163 return empty.iterator();
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164 }
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167 }