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annotate servlet/src/digilib/image/DocuImageImpl.java @ 469:11e11fe4d680

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Improved performance of JAIDocuImage for large images - simulated subsampling by scaling
author robcast
date Wed, 15 Feb 2006 00:09:50 +0100
parents f1f710ff14ad
children 1760b19df530
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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.Rectangle;
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24 import java.io.File;
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25 import java.io.IOException;
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26 import java.io.RandomAccessFile;
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27 import java.util.Iterator;
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28 import java.util.LinkedList;
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29 import java.util.List;
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30
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31 import org.apache.log4j.Logger;
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32 import org.marcoschmidt.image.ImageInfo;
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33
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34 import digilib.io.FileOpException;
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35 import digilib.io.ImageFile;
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36
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37 /** Simple abstract implementation of the <code>DocuImage</code> interface.
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38 *
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39 * This implementation provides basic functionality for the utility methods like
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40 * <code>SetUtils</code>, and <code>getKnownFileTypes</code>. Image methods like
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41 * <code>loadImage</code>, <code>writeImage</code>, <code>getWidth</code>,
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42 * <code>getHeight</code>, <code>crop</code> and <code>scale</code> must be
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43 * implemented by derived classes.
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44 */
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45 public abstract class DocuImageImpl implements DocuImage {
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46
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47 /** logger */
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48 protected static final Logger logger = Logger.getLogger(DocuImage.class);
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49
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50 /** Interpolation quality. */
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51 protected int quality = 0;
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52
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53 /** epsilon for float comparisons. */
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54 public final double epsilon = 1e-5;
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55
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56 /** image mime-type */
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57 protected String mimeType = null;
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58
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59 /**
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60 * Returns the quality.
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61 * @return int
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62 */
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63 public int getQuality() {
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64 return quality;
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65 }
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67 /**
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68 * Sets the quality.
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69 * @param quality The quality to set
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70 */
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71 public void setQuality(int quality) {
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72 this.quality = quality;
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73 }
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75 /** Check image size and type and store in ImageFile f */
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76 public boolean identify(ImageFile imgf) throws IOException {
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77 // fileset to store the information
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78 File f = imgf.getFile();
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79 if (f == null) {
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80 throw new IOException("File not found!");
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81 }
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82 RandomAccessFile raf = new RandomAccessFile(f, "r");
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83 // set up ImageInfo object
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84 ImageInfo iif = new ImageInfo();
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85 iif.setInput(raf);
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86 iif.setCollectComments(false);
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87 iif.setDetermineImageNumber(false);
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88 logger.debug("identifying (ImageInfo) " + f);
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89 // try with ImageInfo first
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90 if (iif.check()) {
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91 ImageSize d = new ImageSize(iif.getWidth(), iif.getHeight());
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92 imgf.setSize(d);
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93 imgf.setMimetype(iif.getMimeType());
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94 //logger.debug(" format:"+iif.getFormatName());
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95 raf.close();
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96 logger.debug("image size: " + imgf.getSize());
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97 return true;
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98 }
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99 return false;
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100 }
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101
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102 /** Crop and scale the current image.
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103 *
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104 * The current image is cropped to a rectangle of width, height at position
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105 * x_off, y_off. The resulting image is scaled by the factor scale using the
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106 * interpolation quality qual (0=worst).
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107 *
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108 * @param x_off X offset of the crop rectangle in pixel.
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109 * @param y_off Y offset of the crop rectangle in pixel.
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110 * @param width Width of the crop rectangle in pixel.
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111 * @param height Height of the crop rectangle in pixel.
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112 * @param scale Scaling factor.
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113 * @param qual Interpolation quality (0=worst).
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114 * @throws ImageOpException Exception thrown on any error.
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115 */
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116 public void cropAndScale(
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117 int x_off, int y_off, int width, int height, double scale, int qual)
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118 throws ImageOpException {
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119
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120 setQuality(qual);
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121 crop(x_off, y_off, width, height);
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122 scale(scale, scale);
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123 }
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124
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125 public String getMimetype() {
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126 return mimeType;
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127 }
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128
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129 public void rotate(double angle) throws ImageOpException {
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130 // just a do-nothing implementation
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131 }
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132
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133 public void mirror(double angle) throws ImageOpException {
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134 // just a do-nothing implementation
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135 }
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136
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137 public void enhance(float mult, float add) throws ImageOpException {
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138 // just a do-nothing implementation
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139 }
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140
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141 public boolean isSubimageSupported() {
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142 // partial loading not supported per default
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143 return false;
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144 }
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145
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146 public void loadSubimage(ImageFile f, Rectangle region, int subsample)
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147 throws FileOpException {
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148 // empty implementation
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149 }
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150
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151 public void enhanceRGB(float[] rgbm, float[] rgba)
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152 throws ImageOpException {
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153 // emtpy implementation
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154 }
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155
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156 public void dispose() {
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157 // emtpy implementation
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158 }
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159
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160 public Iterator getSupportedFormats() {
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161 List empty = new LinkedList();
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162 return empty.iterator();
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163 }
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164
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165 }