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comparison servlet/src/digilib/image/ImageWorker.java @ 557:0885f5ca5b24 digilibPDF

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more refactoring and rearranging pdf and image generation works now
author robcast
date Thu, 16 Dec 2010 21:19:11 +0100
parents servlet/src/digilib/servlet/ImageWorker.java@e1094c5ec032
children 4c51d71aef13
comparison
equal deleted inserted replaced
556:5cc180bb0a5c 557:0885f5ca5b24
1 /** Worker (Callable) that renders an image.
2 *
3 */
4 package digilib.image;
5
6 import java.awt.Rectangle;
7 import java.io.IOException;
8 import java.util.concurrent.Callable;
9
10 import org.apache.log4j.Logger;
11
12 import digilib.io.FileOpException;
13 import digilib.servlet.DigilibConfiguration;
14
15 /** Worker that renders an image.
16 *
17 * @author casties
18 *
19 */
20 public class ImageWorker implements Callable<DocuImage> {
21
22
23 protected static Logger logger = Logger.getLogger(ImageWorker.class);
24 private DigilibConfiguration dlConfig;
25 private ImageJobDescription jobinfo;
26
27 public ImageWorker(DigilibConfiguration dlConfig, ImageJobDescription jobinfo) {
28 super();
29 this.dlConfig = dlConfig;
30 this.jobinfo = jobinfo;
31 }
32
33 /**
34 * render and return the image
35 */
36 @Override
37 public DocuImage call() throws FileOpException, IOException, ImageOpException {
38
39 logger.debug("image worker starting");
40 long startTime = System.currentTimeMillis();
41
42 /* crop and scale image */
43
44 // new DocuImage instance
45 DocuImage docuImage = dlConfig.getDocuImageInstance();
46 if (docuImage == null) {
47 throw new ImageOpException("Unable to load DocuImage class!");
48 }
49
50 // set interpolation quality
51 docuImage.setQuality(jobinfo.get_scaleQual());
52
53 Rectangle loadRect = jobinfo.getOuterUserImgArea().getBounds();
54 float scaleXY = jobinfo.getScaleXY();
55
56 // use subimage loading if possible
57 if (docuImage.isSubimageSupported()) {
58 logger.debug("Subimage: scale " + scaleXY + " = " + (1 / scaleXY));
59 float subf = 1f;
60 float subsamp = 1f;
61 if (scaleXY < 1) {
62 subf = 1 / scaleXY;
63 // for higher quality reduce subsample factor by minSubsample
64 if (jobinfo.get_scaleQual() > 0) {
65 subsamp = (float) Math.max(Math.floor(subf / dlConfig.getAsFloat("subsample-minimum")), 1d);
66 } else {
67 subsamp = (float) Math.floor(subf);
68 }
69 scaleXY = subsamp / subf;
70 logger.debug("Using subsampling: " + subsamp + " rest "
71 + scaleXY);
72 }
73
74 docuImage.loadSubimage(jobinfo.getFileToLoad(), loadRect, (int) subsamp);
75
76 logger.debug("SUBSAMP: " + subsamp + " -> " + docuImage.getWidth()
77 + "x" + docuImage.getHeight());
78
79 docuImage.scale(scaleXY, scaleXY);
80
81 } else {
82 // else load and crop the whole file
83 docuImage.loadImage(jobinfo.getFileToLoad());
84 docuImage.crop((int) loadRect.getX(), (int) loadRect.getY(),
85 (int) loadRect.getWidth(), (int) loadRect.getHeight());
86
87 docuImage.scale(scaleXY, scaleXY);
88 }
89
90 // mirror image
91 // operation mode: "hmir": mirror horizontally, "vmir": mirror
92 // vertically
93 if (jobinfo.hasOption("hmir")) {
94 docuImage.mirror(0);
95 }
96 if (jobinfo.hasOption("vmir")) {
97 docuImage.mirror(90);
98 }
99
100 // rotate image
101 if (jobinfo.getAsFloat("rot") != 0d) {
102 docuImage.rotate(jobinfo.getAsFloat("rot"));
103 /* if (jobinfo.get_wholeRotArea()) {
104 // crop to the inner bounding box
105 float xcrop = (float) (docuImage.getWidth() - jobinfo.get_innerUserImgArea().getWidth()
106 * scaleXY);
107 float ycrop = (float) (docuImage.getHeight() - jobinfo.get_innerUserImgArea().getHeight()
108 * scaleXY);
109 if ((xcrop > 0) || (ycrop > 0)) {
110 // only crop smaller
111 xcrop = (xcrop > 0) ? xcrop : 0;
112 ycrop = (ycrop > 0) ? ycrop : 0;
113 // crop image
114 docuImage.crop((int) (xcrop / 2), (int) (ycrop / 2),
115 (int) (docuImage.getWidth() - xcrop),
116 (int) (docuImage.getHeight() - ycrop));
117 }
118 } */
119
120 }
121
122 // color modification
123 float[] paramRGBM = jobinfo.getRGBM();
124 float[] paramRGBA = jobinfo.getRGBA();
125 if ((paramRGBM != null) || (paramRGBA != null)) {
126 // make sure we actually have two arrays
127 if (paramRGBM == null) {
128 paramRGBM = new float[3];
129 }
130 if (paramRGBA == null) {
131 paramRGBA = new float[3];
132 }
133 // calculate "contrast" values (c=2^x)
134 float[] mult = new float[3];
135 for (int i = 0; i < 3; i++) {
136 mult[i] = (float) Math.pow(2, (float) paramRGBM[i]);
137 }
138 docuImage.enhanceRGB(mult, paramRGBA);
139 }
140
141 // contrast and brightness enhancement
142 float paramCONT = jobinfo.getAsFloat("cont");
143 float paramBRGT = jobinfo.getAsFloat("brgt");
144 if ((paramCONT != 0f) || (paramBRGT != 0f)) {
145 float mult = (float) Math.pow(2, paramCONT);
146 docuImage.enhance(mult, paramBRGT);
147 }
148
149 logger.debug("rendered in " + (System.currentTimeMillis() - startTime) + "ms");
150
151 return docuImage;
152 }
153
154 }