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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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557
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4 package digilib.image;
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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.io.FileOpException;
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557
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13 import digilib.servlet.DigilibConfiguration;
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543
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14
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15 /** Worker that renders an image.
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16 *
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17 * @author casties
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18 *
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19 */
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20 public class ImageWorker implements Callable<DocuImage> {
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21
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22
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23 protected static Logger logger = Logger.getLogger(ImageWorker.class);
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24 private DigilibConfiguration dlConfig;
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547
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25 private ImageJobDescription jobinfo;
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26
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27 public ImageWorker(DigilibConfiguration dlConfig, ImageJobDescription jobinfo) {
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543
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28 super();
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29 this.dlConfig = dlConfig;
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30 this.jobinfo = jobinfo;
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31 }
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32
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33 /**
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34 * render and return the image
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35 */
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36 public DocuImage call() throws FileOpException, IOException, ImageOpException {
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37
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38 logger.debug("image worker starting");
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39 long startTime = System.currentTimeMillis();
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40
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41 /* crop and scale image */
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42
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43 // new DocuImage instance
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44 DocuImage docuImage = DigilibConfiguration.getDocuImageInstance();
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543
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45 if (docuImage == null) {
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46 throw new ImageOpException("Unable to load DocuImage class!");
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47 }
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48
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49 // set interpolation quality
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565
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50 docuImage.setQuality(jobinfo.getScaleQual());
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51
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52 Rectangle loadRect = jobinfo.getOuterUserImgArea().getBounds();
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53 float scaleXY = jobinfo.getScaleXY();
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54
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55 // use subimage loading if possible
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56 if (docuImage.isSubimageSupported()) {
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57 logger.debug("Subimage: scale " + scaleXY + " = " + (1 / scaleXY));
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58 float subf = 1f;
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59 float subsamp = 1f;
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60 if (scaleXY < 1) {
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61 subf = 1 / scaleXY;
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62 // for higher quality reduce subsample factor by minSubsample
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565
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63 if (jobinfo.getScaleQual() > 0) {
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64 subsamp = (float) Math.max(Math.floor(subf / dlConfig.getAsFloat("subsample-minimum")), 1d);
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65 } else {
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66 subsamp = (float) Math.floor(subf);
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67 }
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68 scaleXY = subsamp / subf;
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69 logger.debug("Using subsampling: " + subsamp + " rest "
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70 + scaleXY);
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71 }
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72
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73 docuImage.loadSubimage(jobinfo.getFileToLoad(), loadRect, (int) subsamp);
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74
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75 logger.debug("SUBSAMP: " + subsamp + " -> " + docuImage.getSize());
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76
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77 docuImage.scale(scaleXY, scaleXY);
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78
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79 } else {
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80 // else load and crop the whole file
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81 docuImage.loadImage(jobinfo.getFileToLoad());
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82 docuImage.crop((int) loadRect.getX(), (int) loadRect.getY(),
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83 (int) loadRect.getWidth(), (int) loadRect.getHeight());
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84
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85 docuImage.scale(scaleXY, scaleXY);
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86 }
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87
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88 // mirror image
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89 // operation mode: "hmir": mirror horizontally, "vmir": mirror
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90 // vertically
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547
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91 if (jobinfo.hasOption("hmir")) {
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92 docuImage.mirror(0);
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93 }
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94 if (jobinfo.hasOption("vmir")) {
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95 docuImage.mirror(90);
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96 }
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97
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98 // rotate image
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99 if (jobinfo.getAsFloat("rot") != 0d) {
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100 docuImage.rotate(jobinfo.getAsFloat("rot"));
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101 /* if (jobinfo.get_wholeRotArea()) {
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543
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102 // crop to the inner bounding box
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103 float xcrop = (float) (docuImage.getWidth() - jobinfo.get_innerUserImgArea().getWidth()
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104 * scaleXY);
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105 float ycrop = (float) (docuImage.getHeight() - jobinfo.get_innerUserImgArea().getHeight()
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106 * scaleXY);
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107 if ((xcrop > 0) || (ycrop > 0)) {
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108 // only crop smaller
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109 xcrop = (xcrop > 0) ? xcrop : 0;
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110 ycrop = (ycrop > 0) ? ycrop : 0;
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111 // crop image
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112 docuImage.crop((int) (xcrop / 2), (int) (ycrop / 2),
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113 (int) (docuImage.getWidth() - xcrop),
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114 (int) (docuImage.getHeight() - ycrop));
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115 }
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547
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116 } */
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117
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118 }
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119
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120 // color modification
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121 float[] paramRGBM = jobinfo.getRGBM();
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122 float[] paramRGBA = jobinfo.getRGBA();
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123 if ((paramRGBM != null) || (paramRGBA != null)) {
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547
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124 // make sure we actually have two arrays
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125 if (paramRGBM == null) {
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126 paramRGBM = new float[3];
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127 }
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128 if (paramRGBA == null) {
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129 paramRGBA = new float[3];
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130 }
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131 // calculate "contrast" values (c=2^x)
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132 float[] mult = new float[3];
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133 for (int i = 0; i < 3; i++) {
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134 mult[i] = (float) Math.pow(2, (float) paramRGBM[i]);
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135 }
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136 docuImage.enhanceRGB(mult, paramRGBA);
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137 }
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138
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139 // contrast and brightness enhancement
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140 float paramCONT = jobinfo.getAsFloat("cont");
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141 float paramBRGT = jobinfo.getAsFloat("brgt");
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142 if ((paramCONT != 0f) || (paramBRGT != 0f)) {
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143 float mult = (float) Math.pow(2, paramCONT);
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144 docuImage.enhance(mult, paramBRGT);
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145 }
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146
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147 logger.debug("rendered in " + (System.currentTimeMillis() - startTime) + "ms");
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148
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149 return docuImage;
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150 }
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151
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152 }
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