Mercurial > hg > digilib-old

annotate servlet/src/digilib/image/JIMIDocuImage.java @ 149:04ad64b2137a

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Servlet version 1.14b1 - better performance with thumbnails (really, this time :-) - new DocuInfo class - new Directory class - DocuFile uses String and Directory as data members - parameter rearrangements
author robcast
date Tue, 26 Aug 2003 22:28:43 +0200
parents 63c8186455c1
children e743b853efca
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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.Utils;
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35 import digilib.io.DocuFile;
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36 import digilib.io.FileOpException;
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37
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38 /** Implementation of DocuImage using the JIMI image Library. */
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39 public class JIMIDocuImage extends DocuImageImpl {
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40
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41 private JimiRasterImage img;
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42 private ImageProducer imgp;
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43 private int imgWidth = 0;
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44 private int imgHeight = 0;
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46 public JIMIDocuImage() {
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47 }
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49 public JIMIDocuImage(Utils u) {
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50 util = u;
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51 }
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53 /**
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54 * load image file
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55 */
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56 public void loadImage(DocuFile f) throws FileOpException {
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57 System.gc();
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58 try {
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59 img = Jimi.getRasterImage(f.getFile().toURL());
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60 } catch (java.net.MalformedURLException e) {
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61 util.dprintln(3, "ERROR(loadImage): MalformedURLException");
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62 } catch (JimiException e) {
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63 util.dprintln(3, "ERROR(loadImage): JIMIException");
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64 throw new FileOpException("Unable to load File!" + e);
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65 }
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66 if (img == null) {
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67 util.dprintln(3, "ERROR(loadImage): unable to load file");
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68 throw new FileOpException("Unable to load File!");
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69 }
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70 imgp = img.getImageProducer();
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71 imgWidth = img.getWidth();
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72 imgHeight = img.getHeight();
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73 }
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75 /**
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76 * write image of type mt to Stream
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77 */
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78 public void writeImage(String mt, OutputStream ostream)
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79 throws FileOpException {
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80 try {
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81 // render output
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82 Jimi.putImage(mt, imgp, ostream);
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83
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84 } catch (JimiException e) {
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85 throw new FileOpException("Error writing image!" + e);
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86 }
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87 }
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88
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89 public int getWidth() {
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90 return imgWidth;
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91 }
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92
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93 public int getHeight() {
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94 return imgHeight;
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95 }
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96
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97 public void scale(double scale, double scaleY) throws ImageOpException {
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98
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99 ImageFilter scaleFilter;
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100 int destWidth = (int) (scale * (float) imgWidth);
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101 int destHeight = (int) (scale * (float) imgHeight);
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102
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103 // setup scale and interpolation quality
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104 if (quality > 0) {
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105 util.dprintln(4, "quality q1");
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106 scaleFilter = new AreaAverageScaleFilter(destWidth, destHeight);
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107 } else {
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108 util.dprintln(4, "quality q0");
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109 scaleFilter = new ReplicatingScaleFilter(destWidth, destHeight);
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110 }
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111
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112 ImageProducer scaledImg = new FilteredImageSource(imgp, scaleFilter);
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113
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114 if (scaledImg == null) {
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115 util.dprintln(2, "ERROR(cropAndScale): error in scale");
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116 throw new ImageOpException("Unable to scale");
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117 }
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118
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119 imgp = scaledImg;
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120 imgWidth = destWidth;
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121 imgHeight = destHeight;
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122 }
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123
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124 public void crop(int x_off, int y_off, int width, int height)
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125 throws ImageOpException {
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126 // setup Crop
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127 ImageProducer croppedImg =
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128 img.getCroppedImageProducer(x_off, y_off, width, height);
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129 //util.dprintln(3, "CROP:"+croppedImg.getWidth()+"x"+croppedImg.getHeight()); //DEBUG
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131 if (croppedImg == null) {
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132 util.dprintln(2, "ERROR(cropAndScale): error in crop");
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133 throw new ImageOpException("Unable to crop");
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134 }
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135 imgp = croppedImg;
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136 imgWidth = width;
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137 imgHeight = height;
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138 }
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140 }