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annotate servlet/src/digilib/image/JIMIDocuImage.java @ 218:0dd38cb2961f

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author robcast
date Tue, 29 Jun 2004 12:08:24 +0200
parents ffbe705d1c3f
children
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1 /* JAIDocuImage -- Image class implementation using JIMI toolkit
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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 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.FilteredImageSource;
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24 import java.awt.image.ImageFilter;
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25 import java.awt.image.ImageProducer;
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26 import java.io.OutputStream;
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27
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28 import com.sun.jimi.core.Jimi;
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29 import com.sun.jimi.core.JimiException;
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30 import com.sun.jimi.core.filters.AreaAverageScaleFilter;
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31 import com.sun.jimi.core.filters.ReplicatingScaleFilter;
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32 import com.sun.jimi.core.raster.JimiRasterImage;
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33
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34 import digilib.io.ImageFile;
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35 import digilib.io.FileOpException;
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36
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37 /** Implementation of DocuImage using the JIMI image Library. */
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38 public class JIMIDocuImage extends DocuImageImpl {
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39
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40 private JimiRasterImage img;
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41 private ImageProducer imgp;
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42 private int imgWidth = 0;
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43 private int imgHeight = 0;
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44
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45 /**
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46 * load image file
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47 */
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48 public void loadImage(ImageFile f) throws FileOpException {
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49 System.gc();
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50 try {
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51 img = Jimi.getRasterImage(f.getFile().toURL());
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52 } catch (java.net.MalformedURLException e) {
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53 logger.debug("ERROR(loadImage): MalformedURLException");
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54 } catch (JimiException e) {
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55 logger.debug("ERROR(loadImage): JIMIException");
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56 throw new FileOpException("Unable to load File!" + e);
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57 }
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58 if (img == null) {
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59 logger.debug("ERROR(loadImage): unable to load file");
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60 throw new FileOpException("Unable to load File!");
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61 }
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62 imgp = img.getImageProducer();
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63 imgWidth = img.getWidth();
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64 imgHeight = img.getHeight();
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65 }
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67 /**
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68 * write image of type mt to Stream
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69 */
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70 public void writeImage(String mt, OutputStream ostream)
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71 throws FileOpException {
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72 try {
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73 // render output
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74 Jimi.putImage(mt, imgp, ostream);
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75
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76 } catch (JimiException e) {
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77 throw new FileOpException("Error writing image!" + e);
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78 }
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79 }
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80
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81 public int getWidth() {
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82 return imgWidth;
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83 }
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84
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85 public int getHeight() {
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86 return imgHeight;
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87 }
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88
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89 public void scale(double scale, double scaleY) throws ImageOpException {
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90
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91 ImageFilter scaleFilter;
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92 int destWidth = (int) (scale * (float) imgWidth);
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93 int destHeight = (int) (scale * (float) imgHeight);
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94
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95 // setup scale and interpolation quality
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96 if (quality > 0) {
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97 logger.debug("quality q1");
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98 scaleFilter = new AreaAverageScaleFilter(destWidth, destHeight);
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99 } else {
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100 logger.debug("quality q0");
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101 scaleFilter = new ReplicatingScaleFilter(destWidth, destHeight);
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102 }
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103
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104 ImageProducer scaledImg = new FilteredImageSource(imgp, scaleFilter);
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105
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106 if (scaledImg == null) {
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107 throw new ImageOpException("Unable to scale");
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108 }
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109
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110 imgp = scaledImg;
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111 imgWidth = destWidth;
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112 imgHeight = destHeight;
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113 }
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114
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115 public void crop(int x_off, int y_off, int width, int height)
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116 throws ImageOpException {
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117 // setup Crop
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118 ImageProducer croppedImg =
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119 img.getCroppedImageProducer(x_off, y_off, width, height);
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120
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121 if (croppedImg == null) {
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122 throw new ImageOpException("Unable to crop");
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123 }
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124 imgp = croppedImg;
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125 imgWidth = width;
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126 imgHeight = height;
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127 }
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128
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129 /* (non-Javadoc)
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130 * @see digilib.image.DocuImage#dispose()
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131 */
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132 public void dispose() {
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133 img = null;
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134 imgp = null;
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135 }
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137 }