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1 /* JAIDocuImage -- Image class implementation using JAI (Java Advanced Imaging)
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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 JAIDocuImage 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 JAIDocuImage() {
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42 }
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43
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44 public JAIDocuImage(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("fileload", 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("encode", 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;
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166 }
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167
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168 }
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