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1 /* ImageLoaderDocuImage -- Image class implementation using JDK 1.4 ImageLoader
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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.geom.*;
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31 import java.awt.image.renderable.*;
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32
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33 import javax.imageio.*;
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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 public class ImageLoaderDocuImage extends DocuImageImpl {
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39
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40 private BufferedImage img;
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41
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42 public ImageLoaderDocuImage() {
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43 }
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44
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45 public ImageLoaderDocuImage(Utils u) {
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46 util = u;
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47 }
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48
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49 /**
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50 * load image file
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51 */
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52 public void loadImage(File f) throws FileOpException {
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53 util.dprintln(10, "loadImage!");
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54 System.gc();
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55 try {
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56 for (int i = 0; i < ImageIO.getReaderFormatNames().length; i++) {
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57 System.out.println("ImageLoader reader:"+ImageIO.getReaderFormatNames()[i]);
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58 }
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59 for (int i = 0; i < ImageIO.getWriterFormatNames().length; i++) {
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60 System.out.println("ImageLoader writer:"+ImageIO.getWriterFormatNames()[i]);
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61 }
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62 img = ImageIO.read(f);
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63 if (img == null) {
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64 util.dprintln(3, "ERROR(loadImage): unable to load file");
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65 throw new FileOpException("Unable to load File!");
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66 }
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67 }
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68 catch (IOException e) {
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69 throw new FileOpException("Error reading image.");
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70 }
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71 }
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72
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73 /**
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74 * write image of type mt to Stream
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75 */
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76 public void writeImage(String mt, ServletResponse res)
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77 throws FileOpException {
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78 util.dprintln(10, "writeImage!");
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79 try {
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80 // setup output
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81 String type = "png";
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82 if (mt == "image/jpeg") {
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83 type = "jpeg";
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84 } else if (mt == "image/png") {
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85 type = "png";
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86 } else {
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87 // unknown mime type
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88 util.dprintln(2, "ERROR(writeImage): Unknown mime type "+mt);
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89 throw new FileOpException("Unknown mime type: "+mt);
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90 }
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91 res.setContentType(mt);
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92 // render output
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93 if (ImageIO.write(img, type, res.getOutputStream())) {
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94 // writing was OK
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95 return;
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96 } else {
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97 throw new FileOpException("Error writing image: Unknown image format!");
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98 }
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99 } catch (IOException e) {
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100 // e.printStackTrace();
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101 throw new FileOpException("Error writing image.");
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102 }
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103 }
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104
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105 public int getWidth() {
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106 if (img != null) {
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107 return img.getWidth();
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108 }
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109 return 0;
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110 }
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111
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112 public int getHeight() {
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113 if (img != null) {
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114 return img.getHeight();
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115 }
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116 return 0;
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117 }
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118
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119 /**
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120 * crop and scale image
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121 * take rectangle width,height at position x_off,y_off
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122 * and scale by scale
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123 */
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124 public void cropAndScale(int x_off, int y_off, int width, int height,
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125 float scale, int qual) throws ImageOpException {
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126 util.dprintln(10, "cropAndScale!");
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127
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128 int scaleInt = 0;
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129 // setup interpolation quality
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130 if (qual > 0) {
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131 util.dprintln(4, "quality q1");
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132 scaleInt = AffineTransformOp.TYPE_BILINEAR;
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133 } else {
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134 util.dprintln(4, "quality q0");
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135 scaleInt = AffineTransformOp.TYPE_NEAREST_NEIGHBOR;
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136 }
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137
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138 // setup Crop
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139 BufferedImage croppedImg = img.getSubimage(x_off, y_off, width, height);
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140
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141 img = null; // free img
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142 util.dprintln(3, "CROP:"+croppedImg.getWidth()+"x"+croppedImg.getHeight()); //DEBUG
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143 // util.dprintln(2, " time "+(System.currentTimeMillis()-startTime)+"ms");
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144
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145 if (croppedImg == null) {
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146 util.dprintln(2, "ERROR(cropAndScale): error in crop");
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147 throw new ImageOpException("Unable to crop");
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148 }
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149
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150 // setup scale
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151 AffineTransformOp scaleOp = new AffineTransformOp(
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152 AffineTransform.getScaleInstance(scale, scale),
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153 scaleInt);
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154 BufferedImage scaledImg = scaleOp.filter(croppedImg, null);
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155 croppedImg = null; // free opCrop
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156
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157 if (scaledImg == null) {
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158 util.dprintln(2, "ERROR(cropAndScale): error in scale");
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159 throw new ImageOpException("Unable to scale");
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160 }
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161 img = scaledImg;
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162 }
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163
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164 }
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