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1
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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 javax.servlet.*;
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24 import javax.servlet.http.*;
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25 import java.io.*;
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26 import java.util.*;
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27
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28 import com.sun.jimi.core.*;
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29 import com.sun.jimi.core.raster.*;
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30 import com.sun.jimi.core.filters.*;
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31
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32 import java.awt.*;
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33 import java.awt.image.*;
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34
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35 import digilib.*;
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36 import digilib.io.*;
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37
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38
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73
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39 /** Implementation of DocuImage using the JIMI image Library. */
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1
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40 public class JIMIDocuImage extends DocuImageImpl {
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41
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42 private JimiRasterImage img;
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43 private ImageProducer imgp;
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44
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45 public JIMIDocuImage() {
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46 }
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47
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48 public JIMIDocuImage(Utils u) {
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49 util = u;
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50 }
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51
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52 /**
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53 * load image file
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54 */
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55 public void loadImage(File f) throws FileOpException {
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56 System.gc();
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57 try {
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58 img = Jimi.getRasterImage(f.toURL());
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59 } catch (java.net.MalformedURLException e) {
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60 util.dprintln(3, "ERROR(loadImage): MalformedURLException");
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61 } catch (JimiException e) {
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62 util.dprintln(3, "ERROR(loadImage): JIMIException");
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63 throw new FileOpException("Unable to load File!"+e);
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64 }
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65 if (img == null) {
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66 util.dprintln(3, "ERROR(loadImage): unable to load file");
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67 throw new FileOpException("Unable to load File!");
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68 }
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69 }
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70
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71 /**
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72 * write image of type mt to Stream
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73 */
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74 public void writeImage(String mt, ServletResponse res)
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75 throws FileOpException {
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76 try {
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77 // setup output
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78 res.setContentType(mt);
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79 // render output
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80 Jimi.putImage(mt, imgp, res.getOutputStream());
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81
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82 } catch (JimiException e) {
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83 throw new FileOpException("Error writing image!"+e);
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84 } catch (IOException 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 if (img != null) {
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91 return img.getWidth();
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92 }
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93 return 0;
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94 }
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95
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96 public int getHeight() {
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97 if (img != null) {
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98 return img.getHeight();
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99 }
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100 return 0;
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101 }
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102
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103
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104 /**
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105 * crop and scale image
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106 * take rectangle width,height at position x_off,y_off
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107 * and scale by scale
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108 */
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109 public void cropAndScale(int x_off, int y_off, int width, int height,
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110 float scale, int qual) throws ImageOpException {
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111
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112 ImageFilter scaleFilter;
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113 int destWidth = (int)(scale * (float)width);
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114 int destHeight = (int)(scale * (float)height);
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115
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116 // setup Crop
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117 ImageProducer croppedImg = img.getCroppedImageProducer(x_off, y_off, width, height);
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118 //util.dprintln(3, "CROP:"+croppedImg.getWidth()+"x"+croppedImg.getHeight()); //DEBUG
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119
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120 if (croppedImg == null) {
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121 util.dprintln(2, "ERROR(cropAndScale): error in crop");
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122 throw new ImageOpException("Unable to crop");
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123 }
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124
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125 // setup scale and interpolation quality
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126 if (qual > 0) {
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127 util.dprintln(4, "quality q1");
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128 scaleFilter = new AreaAverageScaleFilter(destWidth, destHeight);
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129 } else {
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130 util.dprintln(4, "quality q0");
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131 scaleFilter = new ReplicatingScaleFilter(destWidth, destHeight);
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132 }
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133
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134 ImageProducer scaledImg = new FilteredImageSource(croppedImg, scaleFilter);
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135
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136 if (scaledImg == null) {
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137 util.dprintln(2, "ERROR(cropAndScale): error in scale");
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138 throw new ImageOpException("Unable to scale");
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139 }
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140
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141 imgp = scaledImg;
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142 }
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143
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144 }
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