--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/servlet/src/digilib/image/ImageWorker.java	Thu Dec 16 21:19:11 2010 +0100
@@ -0,0 +1,154 @@
+/** Worker (Callable) that renders an image.
+ * 
+ */
+package digilib.image;
+
+import java.awt.Rectangle;
+import java.io.IOException;
+import java.util.concurrent.Callable;
+
+import org.apache.log4j.Logger;
+
+import digilib.io.FileOpException;
+import digilib.servlet.DigilibConfiguration;
+
+/** Worker that renders an image.
+ * 
+ * @author casties
+ *
+ */
+public class ImageWorker implements Callable<DocuImage> {
+
+    
+    protected static Logger logger = Logger.getLogger(ImageWorker.class);
+    private DigilibConfiguration dlConfig;
+    private ImageJobDescription jobinfo;
+
+    public ImageWorker(DigilibConfiguration dlConfig, ImageJobDescription jobinfo) {
+        super();
+        this.dlConfig = dlConfig;
+        this.jobinfo = jobinfo;
+    }
+
+    /**
+     * render and return the image
+     */
+    @Override
+    public DocuImage call() throws FileOpException, IOException, ImageOpException {
+        
+        logger.debug("image worker starting");
+        long startTime = System.currentTimeMillis();
+
+        /* crop and scale image */
+
+        // new DocuImage instance
+        DocuImage docuImage = dlConfig.getDocuImageInstance();
+        if (docuImage == null) {
+            throw new ImageOpException("Unable to load DocuImage class!");
+        }
+
+        // set interpolation quality
+        docuImage.setQuality(jobinfo.get_scaleQual());
+
+        Rectangle loadRect = jobinfo.getOuterUserImgArea().getBounds();
+        float scaleXY = jobinfo.getScaleXY();
+        
+        // use subimage loading if possible
+        if (docuImage.isSubimageSupported()) {
+            logger.debug("Subimage: scale " + scaleXY + " = " + (1 / scaleXY));
+            float subf = 1f;
+            float subsamp = 1f;
+            if (scaleXY < 1) {
+                subf = 1 / scaleXY;
+                // for higher quality reduce subsample factor by minSubsample
+                if (jobinfo.get_scaleQual() > 0) {
+                    subsamp = (float) Math.max(Math.floor(subf / dlConfig.getAsFloat("subsample-minimum")), 1d);
+                } else {
+                    subsamp = (float) Math.floor(subf);
+                }
+                scaleXY = subsamp / subf;
+                logger.debug("Using subsampling: " + subsamp + " rest "
+                        + scaleXY);
+            }
+
+            docuImage.loadSubimage(jobinfo.getFileToLoad(), loadRect, (int) subsamp);
+
+            logger.debug("SUBSAMP: " + subsamp + " -> " + docuImage.getWidth()
+                    + "x" + docuImage.getHeight());
+
+            docuImage.scale(scaleXY, scaleXY);
+
+        } else {
+            // else load and crop the whole file
+            docuImage.loadImage(jobinfo.getFileToLoad());
+            docuImage.crop((int) loadRect.getX(), (int) loadRect.getY(),
+                    (int) loadRect.getWidth(), (int) loadRect.getHeight());
+
+            docuImage.scale(scaleXY, scaleXY);
+        }
+
+        // mirror image
+        // operation mode: "hmir": mirror horizontally, "vmir": mirror
+        // vertically
+        if (jobinfo.hasOption("hmir")) {
+            docuImage.mirror(0);
+        }
+        if (jobinfo.hasOption("vmir")) {
+            docuImage.mirror(90);
+        }
+
+        // rotate image
+        if (jobinfo.getAsFloat("rot") != 0d) {
+            docuImage.rotate(jobinfo.getAsFloat("rot"));
+            /* if (jobinfo.get_wholeRotArea()) {
+                // crop to the inner bounding box
+                float xcrop = (float) (docuImage.getWidth() - jobinfo.get_innerUserImgArea().getWidth()
+                        * scaleXY);
+                float ycrop = (float) (docuImage.getHeight() - jobinfo.get_innerUserImgArea().getHeight()
+                        * scaleXY);
+                if ((xcrop > 0) || (ycrop > 0)) {
+                    // only crop smaller
+                    xcrop = (xcrop > 0) ? xcrop : 0;
+                    ycrop = (ycrop > 0) ? ycrop : 0;
+                    // crop image
+                    docuImage.crop((int) (xcrop / 2), (int) (ycrop / 2),
+                            (int) (docuImage.getWidth() - xcrop),
+                            (int) (docuImage.getHeight() - ycrop));
+                }
+            } */
+
+        }
+
+        // color modification
+        float[] paramRGBM = jobinfo.getRGBM();
+        float[] paramRGBA = jobinfo.getRGBA();
+        if ((paramRGBM != null) || (paramRGBA != null)) {
+            // make sure we actually have two arrays
+            if (paramRGBM == null) {
+                paramRGBM = new float[3];
+            }
+            if (paramRGBA == null) {
+                paramRGBA = new float[3];
+            }
+            // calculate "contrast" values (c=2^x)
+            float[] mult = new float[3];
+            for (int i = 0; i < 3; i++) {
+                mult[i] = (float) Math.pow(2, (float) paramRGBM[i]);
+            }
+            docuImage.enhanceRGB(mult, paramRGBA);
+        }
+
+        // contrast and brightness enhancement
+        float paramCONT = jobinfo.getAsFloat("cont");
+        float paramBRGT = jobinfo.getAsFloat("brgt");
+        if ((paramCONT != 0f) || (paramBRGT != 0f)) {
+            float mult = (float) Math.pow(2, paramCONT);
+            docuImage.enhance(mult, paramBRGT);
+        }
+
+        logger.debug("rendered in " + (System.currentTimeMillis() - startTime) + "ms");
+
+        return docuImage;
+    }
+
+}