Mercurial > hg > digilib-old

annotate servlet/src/digilib/image/ImageWorker.java @ 568:34701340922e stream

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more starting stream support
author robcast
date Tue, 21 Dec 2010 12:16:33 +0100
parents 8beefd1142b2
children fd2ef7e46119
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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.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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13 import digilib.servlet.DigilibConfiguration;
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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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25 private ImageJobDescription jobinfo;
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26
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27 public ImageWorker(DigilibConfiguration dlConfig, ImageJobDescription jobinfo) {
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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 @Override
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37 public DocuImage call() throws FileOpException, IOException, ImageOpException {
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38
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39 logger.debug("image worker starting");
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40 long startTime = System.currentTimeMillis();
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41
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42 /* crop and scale image */
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43
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44 // new DocuImage instance
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45 DocuImage docuImage = DigilibConfiguration.getDocuImageInstance();
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46 if (docuImage == null) {
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47 throw new ImageOpException("Unable to load DocuImage class!");
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48 }
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49
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50 // set interpolation quality
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51 docuImage.setQuality(jobinfo.getScaleQual());
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52
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53 Rectangle loadRect = jobinfo.getOuterUserImgArea().getBounds();
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54 float scaleXY = jobinfo.getScaleXY();
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55
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56 // use subimage loading if possible
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57 if (docuImage.isSubimageSupported()) {
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58 logger.debug("Subimage: scale " + scaleXY + " = " + (1 / scaleXY));
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59 float subf = 1f;
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60 float subsamp = 1f;
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61 if (scaleXY < 1) {
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62 subf = 1 / scaleXY;
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63 // for higher quality reduce subsample factor by minSubsample
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64 if (jobinfo.getScaleQual() > 0) {
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65 subsamp = (float) Math.max(Math.floor(subf / dlConfig.getAsFloat("subsample-minimum")), 1d);
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66 } else {
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67 subsamp = (float) Math.floor(subf);
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68 }
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69 scaleXY = subsamp / subf;
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70 logger.debug("Using subsampling: " + subsamp + " rest "
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71 + scaleXY);
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72 }
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73
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74 docuImage.loadSubimage(jobinfo.getFileToLoad(), loadRect, (int) subsamp);
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75
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76 logger.debug("SUBSAMP: " + subsamp + " -> " + docuImage.getWidth()
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77 + "x" + docuImage.getHeight());
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78
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79 docuImage.scale(scaleXY, scaleXY);
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80
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81 } else {
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82 // else load and crop the whole file
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83 docuImage.loadImage(jobinfo.getFileToLoad());
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84 docuImage.crop((int) loadRect.getX(), (int) loadRect.getY(),
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85 (int) loadRect.getWidth(), (int) loadRect.getHeight());
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86
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87 docuImage.scale(scaleXY, scaleXY);
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88 }
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89
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90 // mirror image
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91 // operation mode: "hmir": mirror horizontally, "vmir": mirror
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92 // vertically
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93 if (jobinfo.hasOption("hmir")) {
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94 docuImage.mirror(0);
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95 }
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96 if (jobinfo.hasOption("vmir")) {
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97 docuImage.mirror(90);
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98 }
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99
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100 // rotate image
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101 if (jobinfo.getAsFloat("rot") != 0d) {
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102 docuImage.rotate(jobinfo.getAsFloat("rot"));
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103 /* if (jobinfo.get_wholeRotArea()) {
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104 // crop to the inner bounding box
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105 float xcrop = (float) (docuImage.getWidth() - jobinfo.get_innerUserImgArea().getWidth()
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106 * scaleXY);
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107 float ycrop = (float) (docuImage.getHeight() - jobinfo.get_innerUserImgArea().getHeight()
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108 * scaleXY);
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109 if ((xcrop > 0) || (ycrop > 0)) {
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110 // only crop smaller
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111 xcrop = (xcrop > 0) ? xcrop : 0;
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112 ycrop = (ycrop > 0) ? ycrop : 0;
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113 // crop image
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114 docuImage.crop((int) (xcrop / 2), (int) (ycrop / 2),
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115 (int) (docuImage.getWidth() - xcrop),
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116 (int) (docuImage.getHeight() - ycrop));
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117 }
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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 // color modification
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123 float[] paramRGBM = jobinfo.getRGBM();
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124 float[] paramRGBA = jobinfo.getRGBA();
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125 if ((paramRGBM != null) || (paramRGBA != null)) {
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126 // make sure we actually have two arrays
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127 if (paramRGBM == null) {
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128 paramRGBM = new float[3];
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129 }
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130 if (paramRGBA == null) {
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131 paramRGBA = new float[3];
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132 }
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133 // calculate "contrast" values (c=2^x)
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134 float[] mult = new float[3];
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135 for (int i = 0; i < 3; i++) {
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136 mult[i] = (float) Math.pow(2, (float) paramRGBM[i]);
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137 }
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138 docuImage.enhanceRGB(mult, paramRGBA);
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139 }
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140
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141 // contrast and brightness enhancement
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142 float paramCONT = jobinfo.getAsFloat("cont");
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143 float paramBRGT = jobinfo.getAsFloat("brgt");
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144 if ((paramCONT != 0f) || (paramBRGT != 0f)) {
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145 float mult = (float) Math.pow(2, paramCONT);
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146 docuImage.enhance(mult, paramBRGT);
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147 }
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148
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149 logger.debug("rendered in " + (System.currentTimeMillis() - startTime) + "ms");
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150
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151 return docuImage;
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152 }
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153
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154 }