Mercurial > hg > digilib-old
view servlet/src/digilib/image/JIMIDocuImage.java @ 1:0ff3ede32060
Initial revision
author | robcast |
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date | Thu, 17 Jan 2002 15:25:46 +0100 |
parents | |
children | 3b8797fc3e90 |
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/* JAIDocuImage -- Image class implementation using JIMI toolkit 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 com.sun.jimi.core.*; import com.sun.jimi.core.raster.*; import com.sun.jimi.core.filters.*; import java.awt.*; import java.awt.image.*; import digilib.*; import digilib.io.*; public class JIMIDocuImage extends DocuImageImpl { private JimiRasterImage img; private ImageProducer imgp; public JIMIDocuImage() { } public JIMIDocuImage(Utils u) { util = u; } /** * load image file */ public void loadImage(File f) throws FileOpException { System.gc(); try { img = Jimi.getRasterImage(f.toURL()); } catch (java.net.MalformedURLException e) { util.dprintln(3, "ERROR(loadImage): MalformedURLException"); } catch (JimiException e) { util.dprintln(3, "ERROR(loadImage): JIMIException"); throw new FileOpException("Unable to load File!"+e); } 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 res.setContentType(mt); // render output Jimi.putImage(mt, imgp, res.getOutputStream()); } catch (JimiException e) { throw new FileOpException("Error writing image!"+e); } catch (IOException e) { throw new FileOpException("Error writing image."+e); } } 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 { ImageFilter scaleFilter; int destWidth = (int)(scale * (float)width); int destHeight = (int)(scale * (float)height); // setup Crop ImageProducer croppedImg = img.getCroppedImageProducer(x_off, y_off, width, height); //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 and interpolation quality if (qual > 0) { util.dprintln(4, "quality q1"); scaleFilter = new AreaAverageScaleFilter(destWidth, destHeight); } else { util.dprintln(4, "quality q0"); scaleFilter = new ReplicatingScaleFilter(destWidth, destHeight); } ImageProducer scaledImg = new FilteredImageSource(croppedImg, scaleFilter); if (scaledImg == null) { util.dprintln(2, "ERROR(cropAndScale): error in scale"); throw new ImageOpException("Unable to scale"); } imgp = scaledImg; } }