Mercurial > hg > digilib-old

annotate servlet/src/digilib/image/JAIImageLoaderDocuImage.java @ 71:d493563ef672

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New servlet version 1.5b. Mostly cleanup. Global parameters for digilib now in DigilibConfiguration, per request parameters are now all in DigilibRequest. The DocuImage implementation can be selected by the configuration docuimage-class. Pixel-by-pixel view implemented with "mo=clip".
author robcast
date Fri, 24 Jan 2003 21:40:59 +0100
parents 5ea1999befd4
children 3b8797fc3e90
Ignore whitespace changes - Everywhere: Within whitespace: At end of lines:
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64
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1 /* JAIImageLoaderDocuImage -- Image class implementation using JAI's ImageLoader Plugin
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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 java.awt.*;
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29 import java.awt.image.*;
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30 import java.awt.image.renderable.*;
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31 import javax.media.jai.*;
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32
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33 import digilib.*;
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34 import digilib.io.*;
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35
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36
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37 public class JAIImageLoaderDocuImage extends DocuImageImpl {
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38
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39 private RenderedImage img;
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40
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41 public JAIImageLoaderDocuImage() {
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42 }
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43
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44 public JAIImageLoaderDocuImage(Utils u) {
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45 util = u;
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46 }
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47
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48 /**
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49 * load image file
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50 */
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51 public void loadImage(File f) throws FileOpException {
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52 System.gc();
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53 img = JAI.create("ImageRead", f.getAbsolutePath());
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54 if (img == null) {
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55 util.dprintln(3, "ERROR(loadImage): unable to load file");
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56 throw new FileOpException("Unable to load File!");
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57 }
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58 }
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59
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60 /**
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61 * write image of type mt to Stream
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62 */
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63 public void writeImage(String mt, ServletResponse res)
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64 throws FileOpException {
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65 try {
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66 // setup output
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67 ParameterBlock pb3 = new ParameterBlock();
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68 pb3.addSource(img);
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69 pb3.add(res.getOutputStream());
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70 if (mt == "image/jpeg") {
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71 pb3.add("JPEG");
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72 } else if (mt == "image/png") {
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73 pb3.add("PNG");
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74 } else {
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75 // unknown mime type
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76 util.dprintln(2, "ERROR(writeImage): Unknown mime type "+mt);
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77 throw new FileOpException("Unknown mime type: "+mt);
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78 }
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79 res.setContentType(mt);
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80 // render output
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81 JAI.create("ImageWrite", pb3);
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82
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83 } catch (IOException e) {
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84 throw new FileOpException("Error writing image.");
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85 }
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86 }
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87
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88 public int getWidth() {
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89 if (img != null) {
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90 return img.getWidth();
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91 }
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92 return 0;
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93 }
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94
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95 public int getHeight() {
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96 if (img != null) {
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97 return img.getHeight();
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98 }
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99 return 0;
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100 }
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101
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102
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103 /**
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104 * crop and scale image
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105 * take rectangle width,height at position x_off,y_off
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106 * and scale by scale
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107 */
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108 public void cropAndScale(int x_off, int y_off, int width, int height,
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109 float scale, int qual) throws ImageOpException {
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110
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111 Interpolation scaleInt = null;
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112 // setup interpolation quality
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113 if (qual > 1) {
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114 util.dprintln(4, "quality q2");
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115 scaleInt = Interpolation.getInstance(Interpolation.INTERP_BICUBIC);
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116 } else if (qual == 1) {
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117 util.dprintln(4, "quality q1");
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118 scaleInt = Interpolation.getInstance(Interpolation.INTERP_BILINEAR);
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119 } else {
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120 util.dprintln(4, "quality q0");
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121 scaleInt = Interpolation.getInstance(Interpolation.INTERP_NEAREST);
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122 }
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123
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124 // setup Crop
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125 ParameterBlock pb1 = new ParameterBlock();
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126 pb1.addSource(img);
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127 pb1.add((float)x_off);
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128 pb1.add((float)y_off);
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129 pb1.add((float)width);
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130 pb1.add((float)height);
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131 RenderedImage croppedImg = JAI.create("crop", pb1);
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132 img = null; // free img
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133
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134 util.dprintln(3, "CROP:"+croppedImg.getWidth()+"x"+croppedImg.getHeight()); //DEBUG
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135
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136 if (croppedImg == null) {
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137 util.dprintln(2, "ERROR(cropAndScale): error in crop");
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138 throw new ImageOpException("Unable to crop");
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139 }
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140
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141 // setup scale
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142 ParameterBlock pb2 = new ParameterBlock();
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143 pb2.addSource(croppedImg);
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144 pb2.add(scale);
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145 pb2.add(scale);
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146 pb2.add(0f);
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147 pb2.add(0f);
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148 pb2.add(scaleInt);
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149 // the following is nice but way too slow...
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150 //if (opCrop.getColorModel().getPixelSize() < 8) {
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151 // change color model if necessary
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152 // util.dprintln("converting color model...");
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153 // BufferedImage bi = new BufferedImage(1, 1, BufferedImage.TYPE_BYTE_GRAY);
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154 // ImageLayout lay = new ImageLayout(bi);
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155 // rh = new RenderingHints(JAI.KEY_IMAGE_LAYOUT, lay);
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156 //}
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157 RenderedImage scaledImg = JAI.create("scale", pb2);
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158 croppedImg = null; // free opCrop
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159
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160 if (scaledImg == null) {
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161 util.dprintln(2, "ERROR(cropAndScale): error in scale");
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162 throw new ImageOpException("Unable to scale");
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163 }
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164
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165 img = scaledImg;
5ea1999befd4 New JAI ImageLoader plugin. Currently uses first beta version of the plugin.
robcast
parents:
diff changeset
166 }
5ea1999befd4 New JAI ImageLoader plugin. Currently uses first beta version of the plugin.
robcast
parents:
diff changeset
167
5ea1999befd4 New JAI ImageLoader plugin. Currently uses first beta version of the plugin.
robcast
parents:
diff changeset
168 }