--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/servlet/src/digilib/image/JAIDocuImage.java	Thu Jan 17 15:25:46 2002 +0100
@@ -0,0 +1,168 @@
+/* JAIDocuImage -- Image class implementation using JAI (Java Advanced Imaging)
+
+  Digital Image Library servlet components
+
+  Copyright (C) 2001, 2002 Robert Casties (robcast@mail.berlios.de)
+
+  This program is free software; you can redistribute  it and/or modify it
+  under  the terms of  the GNU General  Public License as published by the
+  Free Software Foundation;  either version 2 of the  License, or (at your
+  option) any later version.
+   
+  Please read license.txt for the full details. A copy of the GPL
+  may be found at http://www.gnu.org/copyleft/lgpl.html
+
+  You should have received a copy of the GNU General Public License
+  along with this program; if not, write to the Free Software
+  Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA  02111-1307  USA
+
+*/
+
+package digilib.image;
+
+import javax.servlet.*;
+import javax.servlet.http.*;
+import java.io.*;
+import java.util.*;
+
+import java.awt.*;
+import java.awt.image.*;
+import java.awt.image.renderable.*;
+import javax.media.jai.*;
+
+import digilib.*;
+import digilib.io.*;
+
+
+public class JAIDocuImage extends DocuImageImpl {
+
+  private RenderedImage img;
+
+  public JAIDocuImage() {
+  }
+
+  public JAIDocuImage(Utils u) {
+    util = u;
+  }
+
+  /**
+   *  load image file
+   */
+  public void loadImage(File f) throws FileOpException {
+    System.gc();
+    img = JAI.create("fileload", f.getAbsolutePath());
+    if (img == null) {
+      util.dprintln(3, "ERROR(loadImage): unable to load file");
+      throw new FileOpException("Unable to load File!");
+    }
+  }
+
+  /**
+   *  write image of type mt to Stream
+   */
+  public void writeImage(String mt, ServletResponse res)
+         throws FileOpException {
+    try {
+    // setup output
+    ParameterBlock pb3 = new ParameterBlock();
+    pb3.addSource(img);
+    pb3.add(res.getOutputStream());
+    if (mt == "image/jpeg") {
+      pb3.add("JPEG");
+    } else if (mt == "image/png") {
+      pb3.add("PNG");
+    } else {
+      // unknown mime type
+      util.dprintln(2, "ERROR(writeImage): Unknown mime type "+mt);
+      throw new FileOpException("Unknown mime type: "+mt);
+    }
+    res.setContentType(mt);
+    // render output
+    JAI.create("encode", pb3);
+
+    } catch (IOException e) {
+      throw new FileOpException("Error writing image.");
+    }
+  }
+
+  public int getWidth() {
+    if (img != null) {
+      return img.getWidth();
+    }
+    return 0;
+  }
+
+  public int getHeight() {
+    if (img != null) {
+      return img.getHeight();
+    }
+    return 0;
+  }
+
+
+  /**
+   *  crop and scale image
+   *    take rectangle width,height at position x_off,y_off
+   *    and scale by scale
+   */
+   public void cropAndScale(int x_off, int y_off, int width, int height,
+         float scale, int qual) throws ImageOpException {
+
+    Interpolation scaleInt = null;
+    // setup interpolation quality
+    if (qual > 1) {
+      util.dprintln(4, "quality q2");
+      scaleInt = Interpolation.getInstance(Interpolation.INTERP_BICUBIC);
+    } else if (qual == 1) {
+      util.dprintln(4, "quality q1");
+      scaleInt = Interpolation.getInstance(Interpolation.INTERP_BILINEAR);
+    } else {
+      util.dprintln(4, "quality q0");
+      scaleInt = Interpolation.getInstance(Interpolation.INTERP_NEAREST);
+    }
+
+    // setup Crop
+    ParameterBlock pb1 = new ParameterBlock();
+    pb1.addSource(img);
+    pb1.add((float)x_off);
+    pb1.add((float)y_off);
+    pb1.add((float)width);
+    pb1.add((float)height);
+    RenderedImage croppedImg = JAI.create("crop", pb1);
+    img = null; // free img
+
+    util.dprintln(3, "CROP:"+croppedImg.getWidth()+"x"+croppedImg.getHeight()); //DEBUG
+
+    if (croppedImg == null) {
+      util.dprintln(2, "ERROR(cropAndScale): error in crop");
+      throw new ImageOpException("Unable to crop");
+    }
+
+    // setup scale
+    ParameterBlock pb2 = new ParameterBlock();
+    pb2.addSource(croppedImg);
+    pb2.add(scale);
+    pb2.add(scale);
+    pb2.add(0f);
+    pb2.add(0f);
+    pb2.add(scaleInt);
+    // the following is nice but way too slow...
+    //if (opCrop.getColorModel().getPixelSize() < 8) {
+    // change color model if necessary
+    //  util.dprintln("converting color model...");
+    //  BufferedImage bi = new BufferedImage(1, 1, BufferedImage.TYPE_BYTE_GRAY);
+    //  ImageLayout lay = new ImageLayout(bi);
+    //  rh = new RenderingHints(JAI.KEY_IMAGE_LAYOUT, lay);
+    //}
+    RenderedImage scaledImg = JAI.create("scale", pb2);
+    croppedImg = null; // free opCrop
+
+    if (scaledImg == null) {
+      util.dprintln(2, "ERROR(cropAndScale): error in scale");
+      throw new ImageOpException("Unable to scale");
+    }
+
+    img = scaledImg;
+  }
+
+}