Mercurial > hg > digilib-old

annotate servlet/src/digilib/servlet/ImageWorker.java @ 543:919e008ab1fb digilibPDF

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more steps towards more standard java.util.concurrent design
author robcast
date Thu, 14 Oct 2010 14:24:33 +0200
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children e1094c5ec032
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543
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1 /** Worker (Callable) that renders an image.
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2 *
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3 */
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4 package digilib.servlet;
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5
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6 import java.awt.Rectangle;
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7 import java.io.IOException;
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8 import java.util.concurrent.Callable;
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9
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10 import org.apache.log4j.Logger;
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11
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12 import digilib.image.DocuImage;
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13 import digilib.image.ImageOpException;
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14 import digilib.io.FileOpException;
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15
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16 /** Worker that renders an image.
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17 *
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18 * @author casties
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19 *
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20 */
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21 public class ImageWorker implements Callable<DocuImage> {
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22
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23
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24 protected static Logger logger = Logger.getLogger(ImageWorker.class);
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25 private DigilibConfiguration dlConfig;
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26 private ImageJobInformation jobinfo;
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27
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28 public ImageWorker(DigilibConfiguration dlConfig, ImageJobInformation jobinfo) {
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29 super();
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30 this.dlConfig = dlConfig;
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31 this.jobinfo = jobinfo;
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32 }
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33
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34 /**
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35 * render and return the image
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36 */
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37 @Override
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38 public DocuImage call() throws FileOpException, IOException, ImageOpException {
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39
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40 logger.debug("image worker starting");
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41 long startTime = System.currentTimeMillis();
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42
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43 /* crop and scale image */
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44
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45 // new DocuImage instance
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46 DocuImage docuImage = dlConfig.getDocuImageInstance();
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47 if (docuImage == null) {
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48 throw new ImageOpException("Unable to load DocuImage class!");
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49 }
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50
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51 // set interpolation quality
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52 docuImage.setQuality(jobinfo.get_scaleQual());
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53
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54 Rectangle loadRect = jobinfo.get_outerUserImgArea().getBounds();
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55 float scaleXY = jobinfo.get_scaleXY();
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56
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57 // use subimage loading if possible
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58 if (docuImage.isSubimageSupported()) {
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59 logger.debug("Subimage: scale " + scaleXY + " = " + (1 / scaleXY));
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60 float subf = 1f;
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61 float subsamp = 1f;
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62 if (scaleXY < 1) {
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63 subf = 1 / scaleXY;
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64 // for higher quality reduce subsample factor by minSubsample
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65 if (jobinfo.get_scaleQual() > 0) {
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66 subsamp = (float) Math.max(Math.floor(subf / dlConfig.getAsFloat("subsample-minimum")), 1d);
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67 } else {
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68 subsamp = (float) Math.floor(subf);
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69 }
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70 scaleXY = subsamp / subf;
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71 logger.debug("Using subsampling: " + subsamp + " rest "
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72 + scaleXY);
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73 }
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74
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75 docuImage.loadSubimage(jobinfo.get_fileToLoad(), loadRect, (int) subsamp);
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76
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77 logger.debug("SUBSAMP: " + subsamp + " -> " + docuImage.getWidth()
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78 + "x" + docuImage.getHeight());
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79
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80 docuImage.scale(scaleXY, scaleXY);
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81
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82 } else {
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83 // else load and crop the whole file
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84 docuImage.loadImage(jobinfo.get_fileToLoad());
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85 docuImage.crop((int) loadRect.getX(), (int) loadRect.getY(),
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86 (int) loadRect.getWidth(), (int) loadRect.getHeight());
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87
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88 docuImage.scale(scaleXY, scaleXY);
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89 }
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90
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91 // mirror image
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92 // operation mode: "hmir": mirror horizontally, "vmir": mirror
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93 // vertically
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94 if (jobinfo.get_hmir()) {
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95 docuImage.mirror(0);
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96 }
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97 if (jobinfo.get_vmir()) {
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98 docuImage.mirror(90);
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99 }
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100
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101 // rotate image
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102 if (jobinfo.getRot() != 0d) {
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103 docuImage.rotate(jobinfo.getRot());
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104 if (jobinfo.get_wholeRotArea()) {
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105 // crop to the inner bounding box
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106 float xcrop = (float) (docuImage.getWidth() - jobinfo.get_innerUserImgArea().getWidth()
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107 * scaleXY);
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108 float ycrop = (float) (docuImage.getHeight() - jobinfo.get_innerUserImgArea().getHeight()
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109 * scaleXY);
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110 if ((xcrop > 0) || (ycrop > 0)) {
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111 // only crop smaller
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112 xcrop = (xcrop > 0) ? xcrop : 0;
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113 ycrop = (ycrop > 0) ? ycrop : 0;
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114 // crop image
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115 docuImage.crop((int) (xcrop / 2), (int) (ycrop / 2),
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116 (int) (docuImage.getWidth() - xcrop),
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117 (int) (docuImage.getHeight() - ycrop));
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118 }
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119 }
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120
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121 }
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122
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123 // color modification
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124 float[] paramRGBM = jobinfo.get_paramRGBM();
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125 float[] paramRGBA = jobinfo.get_paramRGBA();
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126 if ((paramRGBM != null) || (paramRGBA != null)) {
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127 // make shure we actually have two arrays
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128 if (paramRGBM == null) {
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129 paramRGBM = new float[3];
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130 }
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131 if (paramRGBA == null) {
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132 paramRGBA = new float[3];
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133 }
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134 // calculate "contrast" values (c=2^x)
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135 float[] mult = new float[3];
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136 for (int i = 0; i < 3; i++) {
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137 mult[i] = (float) Math.pow(2, (float) paramRGBM[i]);
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138 }
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139 docuImage.enhanceRGB(mult, paramRGBA);
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140 }
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141
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142 // contrast and brightness enhancement
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143 float paramCONT = jobinfo.getCont();
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144 float paramBRGT = jobinfo.getBrgt();
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145 if ((paramCONT != 0f) || (paramBRGT != 0f)) {
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146 float mult = (float) Math.pow(2, paramCONT);
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147 docuImage.enhance(mult, paramBRGT);
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148 }
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149
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150 logger.debug("rendered in " + (System.currentTimeMillis() - startTime) + "ms");
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151
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152 return docuImage;
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153 }
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154
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155 }