Mercurial > hg > digilib-old
annotate servlet/src/digilib/image/JAIImageLoaderDocuImage.java @ 880:ca6b8c970ea1 jquery
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| author | hertzhaft |
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| date | Thu, 17 Mar 2011 20:25:56 +0100 |
| parents | 2b58d2783ef0 |
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| rev | line source |
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1 /* JAIImageLoaderDocuImage -- Image class implementation using JAI's ImageLoader Plugin |
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2 |
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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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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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11 |
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12 Please read license.txt for the full details. A copy of the GPL |
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13 may be found at http://www.gnu.org/copyleft/lgpl.html |
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14 |
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15 You should have received a copy of the GNU General Public License |
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16 along with this program; if not, write to the Free Software |
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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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19 */ |
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20 |
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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; |
| 588 | 41 import digilib.io.ImageInput; |
| 596 | 42 import digilib.util.ImageSize; |
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43 |
| 73 | 44 /** DocuImage implementation using the Java Advanced Imaging API and the ImageLoader |
| 45 * API of Java 1.4. | |
| 46 */ | |
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47 public class JAIImageLoaderDocuImage extends JAIDocuImage { |
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48 |
| 89 | 49 /** ImageIO image reader */ |
| 50 protected ImageReader reader; | |
| 51 /** current image file */ | |
| 52 protected File imgFile; | |
| 85 | 53 |
| 54 /* loadSubimage is supported. */ | |
| 55 public boolean isSubimageSupported() { | |
| 56 return true; | |
| 57 } | |
| 58 | |
| 570 | 59 /* returns the size of the current image */ |
| 60 public ImageSize getSize() { | |
| 61 ImageSize is = null; | |
| 62 // TODO: can we cache imageSize? | |
| 63 int h = 0; | |
| 64 int w = 0; | |
| 65 try { | |
| 66 if (img == null) { | |
| 67 // get size from ImageReader | |
| 68 h = reader.getHeight(0); | |
| 69 w = reader.getWidth(0); | |
| 70 } else { | |
| 71 // get size from image | |
| 72 h = img.getHeight(); | |
| 73 w = img.getWidth(); | |
| 74 } | |
| 75 is = new ImageSize(w, h); | |
| 76 } catch (IOException e) { | |
| 77 logger.debug("error in getSize:", e); | |
| 78 } | |
| 79 return is; | |
| 80 } | |
| 85 | 81 |
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82 |
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83 /* Load an image file into the Object. */ |
| 588 | 84 public void loadImage(ImageInput ii) throws FileOpException { |
| 589 | 85 logger.debug("loadImage: "+ii); |
| 86 if (ii.hasImageInputStream()) { | |
| 87 img = JAI.create("ImageRead", ii.getImageInputStream()); | |
| 88 } else if (ii.hasFile()) { | |
| 89 img = JAI.create("ImageRead", ii.getFile().getAbsolutePath()); | |
| 90 } | |
| 73 | 91 if (img == null) { |
| 92 throw new FileOpException("Unable to load File!"); | |
| 93 } | |
| 94 } | |
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95 |
| 142 | 96 /* Get an ImageReader for the image file. */ |
| 588 | 97 public ImageReader getReader(ImageInput input) throws IOException { |
| 98 logger.debug("get ImageReader for " + input); | |
| 99 if (this.reader != null) { | |
| 100 if (this.input == input) { | |
| 101 // it was the same input | |
| 102 logger.debug("reusing Reader"); | |
| 103 return reader; | |
| 104 } | |
| 105 // clean up old reader | |
| 106 logger.debug("cleaning Reader!"); | |
| 107 dispose(); | |
| 108 } | |
| 109 this.input = input; | |
| 110 ImageInputStream istream = null; | |
| 111 if (input.hasImageInputStream()) { | |
| 112 // stream input | |
| 113 istream = input.getImageInputStream(); | |
| 114 } else if (input.hasFile()) { | |
| 115 // file only input | |
| 116 RandomAccessFile rf = new RandomAccessFile(input.getFile(), "r"); | |
| 117 istream = new FileImageInputStream(rf); | |
| 118 } else { | |
| 119 throw new FileOpException("Unable to get data from ImageInput"); | |
| 120 } | |
| 121 Iterator<ImageReader> readers; | |
| 122 String mt = input.getMimetype(); | |
| 123 if (mt == null) { | |
| 124 logger.debug("No mime-type. Trying automagic."); | |
| 125 readers = ImageIO.getImageReaders(istream); | |
| 126 } else { | |
| 127 logger.debug("File type:" + mt); | |
| 128 readers = ImageIO.getImageReadersByMIMEType(mt); | |
| 129 } | |
| 130 if (!readers.hasNext()) { | |
| 131 throw new FileOpException("Can't find Reader to load File!"); | |
| 132 } | |
| 133 reader = readers.next(); | |
| 589 | 134 logger.debug("ImageIO: this reader: " + reader.getClass()); |
| 588 | 135 /* are there more readers? */ |
| 136 /* while (readers.hasNext()) { | |
| 137 logger.debug("ImageIO: next reader: " + readers.next().getClass()); | |
| 138 } */ | |
| 139 reader.setInput(istream); | |
| 140 return reader; | |
| 142 | 141 } |
| 142 | |
| 85 | 143 /* Load an image file into the Object. */ |
| 588 | 144 public void loadSubimage(ImageInput ii, Rectangle region, int prescale) |
| 85 | 145 throws FileOpException { |
| 588 | 146 logger.debug("loadSubimage: "+ii.getFile()); |
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147 //System.gc(); |
| 85 | 148 try { |
| 588 | 149 if ((reader == null) || (imgFile != ii.getFile())) { |
| 150 getReader(ii); | |
| 85 | 151 } |
| 152 ImageReadParam readParam = reader.getDefaultReadParam(); | |
| 153 readParam.setSourceRegion(region); | |
| 154 readParam.setSourceSubsampling(prescale, prescale, 0, 0); | |
| 142 | 155 img = reader.read(0, readParam); |
| 156 /* JAI imageread seems to ignore the readParam :-( | |
| 282 | 157 ImageInputStream istream = (ImageInputStream) reader.getInput(); |
| 89 | 158 ParameterBlockJAI pb = new ParameterBlockJAI("imageread"); |
| 159 pb.setParameter("Input", istream); | |
| 160 pb.setParameter("ReadParam", readParam); | |
| 161 pb.setParameter("Reader", reader); | |
| 162 img = JAI.create("imageread", pb); | |
| 142 | 163 */ |
| 85 | 164 } catch (IOException e) { |
| 165 throw new FileOpException("Unable to load File!"); | |
| 166 } | |
| 167 if (img == null) { | |
| 168 throw new FileOpException("Unable to load File!"); | |
| 169 } | |
| 588 | 170 imgFile = ii.getFile(); |
| 85 | 171 } |
| 172 | |
| 149 | 173 |
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174 /* Write the current image to an OutputStream. */ |
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175 public void writeImage(String mt, OutputStream ostream) |
| 570 | 176 throws ImageOpException, ServletException { |
| 209 | 177 logger.debug("writeImage"); |
| 73 | 178 try { |
| 179 // setup output | |
| 180 ParameterBlock pb3 = new ParameterBlock(); | |
| 181 pb3.addSource(img); | |
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182 pb3.add(ostream); |
| 73 | 183 if (mt == "image/jpeg") { |
| 184 pb3.add("JPEG"); | |
| 185 } else if (mt == "image/png") { | |
| 186 pb3.add("PNG"); | |
| 187 } else { | |
| 188 // unknown mime type | |
| 570 | 189 throw new ImageOpException("Unknown mime type: " + mt); |
| 73 | 190 } |
| 191 // render output | |
| 192 JAI.create("ImageWrite", pb3); | |
| 570 | 193 } catch (RuntimeException e) { |
| 194 throw new ServletException("Error writing image."); | |
| 73 | 195 } |
| 196 } | |
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197 |
| 533 | 198 @Override |
| 199 public Image getAwtImage() { | |
| 200 // TODO Auto-generated method stub | |
| 201 return (Image) img; | |
| 202 } | |
| 203 | |
| 204 /* (non-Javadoc) | |
| 148 | 205 * @see java.lang.Object#finalize() |
| 206 */ | |
| 207 protected void finalize() throws Throwable { | |
| 209 | 208 dispose(); |
| 209 super.finalize(); | |
| 210 } | |
| 211 | |
| 212 public void dispose() { | |
| 148 | 213 // we must dispose the ImageReader because it keeps the filehandle open! |
| 214 reader.dispose(); | |
| 215 reader = null; | |
| 216 img = null; | |
| 217 } | |
| 218 | |
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219 } |