Mercurial > hg > digilib-old
annotate servlet/src/digilib/image/JAIImageLoaderDocuImage.java @ 787:b322f553f92e jquery
more new plugin architecture.
| author | robcast |
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| date | Thu, 17 Feb 2011 22:36:49 +0100 |
| parents | fd2ef7e46119 |
| children | aee436f0549d |
| rev | line source |
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New JAI ImageLoader plugin. Currently uses first beta version of the plugin.
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1 /* JAIImageLoaderDocuImage -- Image class implementation using JAI's ImageLoader Plugin |
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New JAI ImageLoader plugin. Currently uses first beta version of the plugin.
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2 |
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New JAI ImageLoader plugin. Currently uses first beta version of the plugin.
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3 Digital Image Library servlet components |
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4 |
| 85 | 5 Copyright (C) 2002, 2003 Robert Casties (robcast@mail.berlios.de) |
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6 |
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New JAI ImageLoader plugin. Currently uses first beta version of the plugin.
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7 This program is free software; you can redistribute it and/or modify it |
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8 under the terms of the GNU General Public License as published by the |
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9 Free Software Foundation; either version 2 of the License, or (at your |
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10 option) any later version. |
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New JAI ImageLoader plugin. Currently uses first beta version of the plugin.
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11 |
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New JAI ImageLoader plugin. Currently uses first beta version of the plugin.
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12 Please read license.txt for the full details. A copy of the GPL |
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New JAI ImageLoader plugin. Currently uses first beta version of the plugin.
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13 may be found at http://www.gnu.org/copyleft/lgpl.html |
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5ea1999befd4
New JAI ImageLoader plugin. Currently uses first beta version of the plugin.
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14 |
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New JAI ImageLoader plugin. Currently uses first beta version of the plugin.
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15 You should have received a copy of the GNU General Public License |
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New JAI ImageLoader plugin. Currently uses first beta version of the plugin.
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16 along with this program; if not, write to the Free Software |
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New JAI ImageLoader plugin. Currently uses first beta version of the plugin.
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17 Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA |
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18 |
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New JAI ImageLoader plugin. Currently uses first beta version of the plugin.
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19 */ |
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20 |
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New JAI ImageLoader plugin. Currently uses first beta version of the plugin.
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21 package digilib.image; |
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22 |
| 533 | 23 import java.awt.Image; |
| 85 | 24 import java.awt.Rectangle; |
| 73 | 25 import java.awt.image.renderable.ParameterBlock; |
| 26 import java.io.File; | |
| 27 import java.io.IOException; | |
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28 import java.io.OutputStream; |
| 89 | 29 import java.io.RandomAccessFile; |
| 85 | 30 import java.util.Iterator; |
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31 |
| 85 | 32 import javax.imageio.ImageIO; |
| 33 import javax.imageio.ImageReadParam; | |
| 34 import javax.imageio.ImageReader; | |
| 220 | 35 import javax.imageio.stream.FileImageInputStream; |
| 85 | 36 import javax.imageio.stream.ImageInputStream; |
| 73 | 37 import javax.media.jai.JAI; |
| 570 | 38 import javax.servlet.ServletException; |
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39 |
| 220 | 40 import digilib.io.FileOpException; |
| 159 | 41 import digilib.io.ImageFile; |
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42 |
| 73 | 43 /** DocuImage implementation using the Java Advanced Imaging API and the ImageLoader |
| 44 * API of Java 1.4. | |
| 45 */ | |
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46 public class JAIImageLoaderDocuImage extends JAIDocuImage { |
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47 |
| 89 | 48 /** ImageIO image reader */ |
| 49 protected ImageReader reader; | |
| 50 /** current image file */ | |
| 51 protected File imgFile; | |
| 85 | 52 |
| 53 /* loadSubimage is supported. */ | |
| 54 public boolean isSubimageSupported() { | |
| 55 return true; | |
| 56 } | |
| 57 | |
| 570 | 58 /* returns the size of the current image */ |
| 59 public ImageSize getSize() { | |
| 60 ImageSize is = null; | |
| 61 // TODO: can we cache imageSize? | |
| 62 int h = 0; | |
| 63 int w = 0; | |
| 64 try { | |
| 65 if (img == null) { | |
| 66 // get size from ImageReader | |
| 67 h = reader.getHeight(0); | |
| 68 w = reader.getWidth(0); | |
| 69 } else { | |
| 70 // get size from image | |
| 71 h = img.getHeight(); | |
| 72 w = img.getWidth(); | |
| 73 } | |
| 74 is = new ImageSize(w, h); | |
| 75 } catch (IOException e) { | |
| 76 logger.debug("error in getSize:", e); | |
| 77 } | |
| 78 return is; | |
| 79 } | |
| 85 | 80 |
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81 |
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82 /* Load an image file into the Object. */ |
| 159 | 83 public void loadImage(ImageFile f) throws FileOpException { |
| 209 | 84 logger.debug("loadImage: "+f.getFile()); |
| 85 //System.gc(); | |
| 149 | 86 img = JAI.create("ImageRead", f.getFile().getAbsolutePath()); |
| 73 | 87 if (img == null) { |
| 88 throw new FileOpException("Unable to load File!"); | |
| 89 } | |
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90 mimeType = f.getMimetype(); |
| 73 | 91 } |
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New JAI ImageLoader plugin. Currently uses first beta version of the plugin.
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92 |
| 142 | 93 /* Get an ImageReader for the image file. */ |
| 282 | 94 public ImageReader getReader(ImageFile f) throws IOException { |
| 209 | 95 logger.debug("preloadImage: "+f.getFile()); |
| 96 //System.gc(); | |
| 149 | 97 RandomAccessFile rf = new RandomAccessFile(f.getFile(), "r"); |
| 220 | 98 ImageInputStream istream = new FileImageInputStream(rf); |
| 282 | 99 //Iterator readers = ImageIO.getImageReaders(istream); |
| 531 | 100 Iterator<ImageReader> readers = ImageIO.getImageReadersByMIMEType(f.getMimetype()); |
| 282 | 101 if (! readers.hasNext()) { |
| 142 | 102 throw new FileOpException("Unable to load File!"); |
| 103 } | |
| 531 | 104 reader = readers.next(); |
| 209 | 105 logger.debug("JAIImageIO: this reader: " + reader.getClass()); |
| 282 | 106 while (readers.hasNext()) { |
| 107 logger.debug(" next reader: " + readers.next().getClass()); | |
| 108 } | |
| 209 | 109 reader.setInput(istream); |
| 282 | 110 return reader; |
| 142 | 111 } |
| 112 | |
| 85 | 113 /* Load an image file into the Object. */ |
| 159 | 114 public void loadSubimage(ImageFile f, Rectangle region, int prescale) |
| 85 | 115 throws FileOpException { |
| 209 | 116 logger.debug("loadSubimage: "+f.getFile()); |
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117 //System.gc(); |
| 85 | 118 try { |
| 149 | 119 if ((reader == null) || (imgFile != f.getFile())) { |
| 282 | 120 getReader(f); |
| 85 | 121 } |
| 122 ImageReadParam readParam = reader.getDefaultReadParam(); | |
| 123 readParam.setSourceRegion(region); | |
| 124 readParam.setSourceSubsampling(prescale, prescale, 0, 0); | |
| 142 | 125 img = reader.read(0, readParam); |
| 126 /* JAI imageread seems to ignore the readParam :-( | |
| 282 | 127 ImageInputStream istream = (ImageInputStream) reader.getInput(); |
| 89 | 128 ParameterBlockJAI pb = new ParameterBlockJAI("imageread"); |
| 129 pb.setParameter("Input", istream); | |
| 130 pb.setParameter("ReadParam", readParam); | |
| 131 pb.setParameter("Reader", reader); | |
| 132 img = JAI.create("imageread", pb); | |
| 142 | 133 */ |
| 85 | 134 } catch (IOException e) { |
| 135 throw new FileOpException("Unable to load File!"); | |
| 136 } | |
| 137 if (img == null) { | |
| 138 throw new FileOpException("Unable to load File!"); | |
| 139 } | |
| 149 | 140 imgFile = f.getFile(); |
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141 mimeType = f.getMimetype(); |
| 85 | 142 } |
| 143 | |
| 149 | 144 |
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145 /* Write the current image to an OutputStream. */ |
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146 public void writeImage(String mt, OutputStream ostream) |
| 570 | 147 throws ImageOpException, ServletException { |
| 209 | 148 logger.debug("writeImage"); |
| 73 | 149 try { |
| 150 // setup output | |
| 151 ParameterBlock pb3 = new ParameterBlock(); | |
| 152 pb3.addSource(img); | |
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153 pb3.add(ostream); |
| 73 | 154 if (mt == "image/jpeg") { |
| 155 pb3.add("JPEG"); | |
| 156 } else if (mt == "image/png") { | |
| 157 pb3.add("PNG"); | |
| 158 } else { | |
| 159 // unknown mime type | |
| 570 | 160 throw new ImageOpException("Unknown mime type: " + mt); |
| 73 | 161 } |
| 162 // render output | |
| 163 JAI.create("ImageWrite", pb3); | |
| 570 | 164 } catch (RuntimeException e) { |
| 165 throw new ServletException("Error writing image."); | |
| 73 | 166 } |
| 167 } | |
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168 |
| 533 | 169 @Override |
| 170 public Image getAwtImage() { | |
| 171 // TODO Auto-generated method stub | |
| 172 return (Image) img; | |
| 173 } | |
| 174 | |
| 175 /* (non-Javadoc) | |
| 148 | 176 * @see java.lang.Object#finalize() |
| 177 */ | |
| 178 protected void finalize() throws Throwable { | |
| 209 | 179 dispose(); |
| 180 super.finalize(); | |
| 181 } | |
| 182 | |
| 183 public void dispose() { | |
| 148 | 184 // we must dispose the ImageReader because it keeps the filehandle open! |
| 185 reader.dispose(); | |
| 186 reader = null; | |
| 187 img = null; | |
| 188 } | |
| 189 | |
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190 } |