Mercurial > hg > digilib-old
diff 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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--- /dev/null Thu Jan 01 00:00:00 1970 +0000 +++ b/servlet/src/digilib/image/JIMIDocuImage.java Thu Jan 17 15:25:46 2002 +0100 @@ -0,0 +1,143 @@ +/* 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; + } + +}