Mercurial > hg > digilib-old
annotate servlet/src/digilib/image/JAIImageLoaderDocuImage.java @ 588:aee436f0549d stream
more work on stream input
| author | robcast |
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| date | Thu, 06 Jan 2011 14:37:50 +0100 |
| parents | fd2ef7e46119 |
| children | 73e041c710d3 |
| 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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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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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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13 may be found at http://www.gnu.org/copyleft/lgpl.html |
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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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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; |
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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. */ |
| 588 | 83 public void loadImage(ImageInput ii) throws FileOpException { |
| 84 logger.debug("loadImage: "+ii.getFile()); | |
| 209 | 85 //System.gc(); |
| 588 | 86 img = JAI.create("ImageRead", ii.getFile().getAbsolutePath()); |
| 73 | 87 if (img == null) { |
| 88 throw new FileOpException("Unable to load File!"); | |
| 89 } | |
| 90 } | |
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91 |
| 142 | 92 /* Get an ImageReader for the image file. */ |
| 588 | 93 public ImageReader getReader(ImageInput input) throws IOException { |
| 94 logger.debug("get ImageReader for " + input); | |
| 95 if (this.reader != null) { | |
| 96 if (this.input == input) { | |
| 97 // it was the same input | |
| 98 logger.debug("reusing Reader"); | |
| 99 return reader; | |
| 100 } | |
| 101 // clean up old reader | |
| 102 logger.debug("cleaning Reader!"); | |
| 103 dispose(); | |
| 104 } | |
| 105 this.input = input; | |
| 106 ImageInputStream istream = null; | |
| 107 if (input.hasImageInputStream()) { | |
| 108 // stream input | |
| 109 istream = input.getImageInputStream(); | |
| 110 } else if (input.hasFile()) { | |
| 111 // file only input | |
| 112 RandomAccessFile rf = new RandomAccessFile(input.getFile(), "r"); | |
| 113 istream = new FileImageInputStream(rf); | |
| 114 } else { | |
| 115 throw new FileOpException("Unable to get data from ImageInput"); | |
| 116 } | |
| 117 Iterator<ImageReader> readers; | |
| 118 String mt = input.getMimetype(); | |
| 119 if (mt == null) { | |
| 120 logger.debug("No mime-type. Trying automagic."); | |
| 121 readers = ImageIO.getImageReaders(istream); | |
| 122 } else { | |
| 123 logger.debug("File type:" + mt); | |
| 124 readers = ImageIO.getImageReadersByMIMEType(mt); | |
| 125 } | |
| 126 if (!readers.hasNext()) { | |
| 127 throw new FileOpException("Can't find Reader to load File!"); | |
| 128 } | |
| 129 reader = readers.next(); | |
| 130 /* are there more readers? */ | |
| 131 logger.debug("ImageIO: this reader: " + reader.getClass()); | |
| 132 /* while (readers.hasNext()) { | |
| 133 logger.debug("ImageIO: next reader: " + readers.next().getClass()); | |
| 134 } */ | |
| 135 reader.setInput(istream); | |
| 136 return reader; | |
| 142 | 137 } |
| 138 | |
| 85 | 139 /* Load an image file into the Object. */ |
| 588 | 140 public void loadSubimage(ImageInput ii, Rectangle region, int prescale) |
| 85 | 141 throws FileOpException { |
| 588 | 142 logger.debug("loadSubimage: "+ii.getFile()); |
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143 //System.gc(); |
| 85 | 144 try { |
| 588 | 145 if ((reader == null) || (imgFile != ii.getFile())) { |
| 146 getReader(ii); | |
| 85 | 147 } |
| 148 ImageReadParam readParam = reader.getDefaultReadParam(); | |
| 149 readParam.setSourceRegion(region); | |
| 150 readParam.setSourceSubsampling(prescale, prescale, 0, 0); | |
| 142 | 151 img = reader.read(0, readParam); |
| 152 /* JAI imageread seems to ignore the readParam :-( | |
| 282 | 153 ImageInputStream istream = (ImageInputStream) reader.getInput(); |
| 89 | 154 ParameterBlockJAI pb = new ParameterBlockJAI("imageread"); |
| 155 pb.setParameter("Input", istream); | |
| 156 pb.setParameter("ReadParam", readParam); | |
| 157 pb.setParameter("Reader", reader); | |
| 158 img = JAI.create("imageread", pb); | |
| 142 | 159 */ |
| 85 | 160 } catch (IOException e) { |
| 161 throw new FileOpException("Unable to load File!"); | |
| 162 } | |
| 163 if (img == null) { | |
| 164 throw new FileOpException("Unable to load File!"); | |
| 165 } | |
| 588 | 166 imgFile = ii.getFile(); |
| 85 | 167 } |
| 168 | |
| 149 | 169 |
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170 /* Write the current image to an OutputStream. */ |
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171 public void writeImage(String mt, OutputStream ostream) |
| 570 | 172 throws ImageOpException, ServletException { |
| 209 | 173 logger.debug("writeImage"); |
| 73 | 174 try { |
| 175 // setup output | |
| 176 ParameterBlock pb3 = new ParameterBlock(); | |
| 177 pb3.addSource(img); | |
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178 pb3.add(ostream); |
| 73 | 179 if (mt == "image/jpeg") { |
| 180 pb3.add("JPEG"); | |
| 181 } else if (mt == "image/png") { | |
| 182 pb3.add("PNG"); | |
| 183 } else { | |
| 184 // unknown mime type | |
| 570 | 185 throw new ImageOpException("Unknown mime type: " + mt); |
| 73 | 186 } |
| 187 // render output | |
| 188 JAI.create("ImageWrite", pb3); | |
| 570 | 189 } catch (RuntimeException e) { |
| 190 throw new ServletException("Error writing image."); | |
| 73 | 191 } |
| 192 } | |
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193 |
| 533 | 194 @Override |
| 195 public Image getAwtImage() { | |
| 196 // TODO Auto-generated method stub | |
| 197 return (Image) img; | |
| 198 } | |
| 199 | |
| 200 /* (non-Javadoc) | |
| 148 | 201 * @see java.lang.Object#finalize() |
| 202 */ | |
| 203 protected void finalize() throws Throwable { | |
| 209 | 204 dispose(); |
| 205 super.finalize(); | |
| 206 } | |
| 207 | |
| 208 public void dispose() { | |
| 148 | 209 // we must dispose the ImageReader because it keeps the filehandle open! |
| 210 reader.dispose(); | |
| 211 reader = null; | |
| 212 img = null; | |
| 213 } | |
| 214 | |
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215 } |