Mercurial > hg > digilib-old
annotate servlet/src/digilib/image/JAIImageLoaderDocuImage.java @ 158:e9a81ac446cb
added Texter servlet and relative paths
| author | robcast |
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| date | Tue, 16 Sep 2003 18:26:31 +0200 |
| parents | 04ad64b2137a |
| children | e743b853efca |
| 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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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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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 |
| 85 | 23 import java.awt.Rectangle; |
| 73 | 24 import java.awt.image.renderable.ParameterBlock; |
| 25 import java.io.File; | |
| 26 import java.io.IOException; | |
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27 import java.io.OutputStream; |
| 89 | 28 import java.io.RandomAccessFile; |
| 85 | 29 import java.util.Iterator; |
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30 |
| 85 | 31 import javax.imageio.ImageIO; |
| 32 import javax.imageio.ImageReadParam; | |
| 33 import javax.imageio.ImageReader; | |
| 34 import javax.imageio.stream.ImageInputStream; | |
| 73 | 35 import javax.media.jai.JAI; |
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36 |
| 89 | 37 import digilib.io.DocuFile; |
| 73 | 38 import digilib.io.FileOpException; |
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39 |
| 73 | 40 /** DocuImage implementation using the Java Advanced Imaging API and the ImageLoader |
| 41 * API of Java 1.4. | |
| 42 */ | |
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43 public class JAIImageLoaderDocuImage extends JAIDocuImage { |
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44 |
| 89 | 45 /** ImageIO image reader */ |
| 46 protected ImageReader reader; | |
| 47 /** current image file */ | |
| 48 protected File imgFile; | |
| 85 | 49 |
| 50 /* loadSubimage is supported. */ | |
| 51 public boolean isSubimageSupported() { | |
| 52 return true; | |
| 53 } | |
| 54 | |
| 55 public int getHeight() { | |
| 56 int h = 0; | |
| 57 try { | |
| 58 if (img == null) { | |
| 59 h = reader.getHeight(0); | |
| 60 } else { | |
| 61 h = img.getHeight(); | |
| 62 } | |
| 63 } catch (IOException e) { | |
| 64 e.printStackTrace(); | |
| 65 } | |
| 66 return h; | |
| 67 } | |
| 68 | |
| 69 public int getWidth() { | |
| 70 int w = 0; | |
| 71 try { | |
| 72 if (img == null) { | |
| 73 w = reader.getWidth(0); | |
| 74 } else { | |
| 75 w = img.getWidth(); | |
| 76 } | |
| 77 } catch (IOException e) { | |
| 78 e.printStackTrace(); | |
| 79 } | |
| 80 return w; | |
| 81 } | |
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82 |
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83 /* Load an image file into the Object. */ |
| 149 | 84 public void loadImage(DocuFile f) throws FileOpException { |
| 73 | 85 System.gc(); |
| 149 | 86 img = JAI.create("ImageRead", f.getFile().getAbsolutePath()); |
| 73 | 87 if (img == null) { |
| 88 util.dprintln(3, "ERROR(loadImage): unable to load file"); | |
| 89 throw new FileOpException("Unable to load File!"); | |
| 90 } | |
| 91 } | |
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92 |
| 142 | 93 /* Get an ImageReader for the image file. */ |
| 149 | 94 public void preloadImage(DocuFile f) throws IOException { |
| 142 | 95 System.gc(); |
| 149 | 96 RandomAccessFile rf = new RandomAccessFile(f.getFile(), "r"); |
| 142 | 97 ImageInputStream istream = ImageIO.createImageInputStream(rf); |
| 149 | 98 //Iterator readers = ImageIO.getImageReaders(istream); |
| 99 Iterator readers = ImageIO.getImageReadersByMIMEType(f.getMimetype()); | |
| 142 | 100 reader = (ImageReader) readers.next(); |
| 101 reader.setInput(istream); | |
| 102 if (reader == null) { | |
| 103 util.dprintln(3, "ERROR(loadImage): unable to load file"); | |
| 104 throw new FileOpException("Unable to load File!"); | |
| 105 } | |
| 106 } | |
| 107 | |
| 85 | 108 /* Load an image file into the Object. */ |
| 149 | 109 public void loadSubimage(DocuFile f, Rectangle region, int prescale) |
| 85 | 110 throws FileOpException { |
| 111 System.gc(); | |
| 112 try { | |
| 149 | 113 if ((reader == null) || (imgFile != f.getFile())) { |
| 85 | 114 preloadImage(f); |
| 115 } | |
| 116 ImageInputStream istream = (ImageInputStream) reader.getInput(); | |
| 117 ImageReadParam readParam = reader.getDefaultReadParam(); | |
| 118 readParam.setSourceRegion(region); | |
| 119 readParam.setSourceSubsampling(prescale, prescale, 0, 0); | |
| 142 | 120 img = reader.read(0, readParam); |
| 121 /* JAI imageread seems to ignore the readParam :-( | |
| 89 | 122 ParameterBlockJAI pb = new ParameterBlockJAI("imageread"); |
| 123 pb.setParameter("Input", istream); | |
| 124 pb.setParameter("ReadParam", readParam); | |
| 125 pb.setParameter("Reader", reader); | |
| 126 img = JAI.create("imageread", pb); | |
| 142 | 127 */ |
| 85 | 128 } catch (IOException e) { |
| 129 util.dprintln(3, "ERROR(loadImage): unable to load file"); | |
| 130 throw new FileOpException("Unable to load File!"); | |
| 131 } | |
| 132 if (img == null) { | |
| 133 util.dprintln(3, "ERROR(loadImage): unable to load file"); | |
| 134 throw new FileOpException("Unable to load File!"); | |
| 135 } | |
| 149 | 136 imgFile = f.getFile(); |
| 85 | 137 } |
| 138 | |
| 149 | 139 |
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140 /* Write the current image to an OutputStream. */ |
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141 public void writeImage(String mt, OutputStream ostream) |
| 73 | 142 throws FileOpException { |
| 143 try { | |
| 144 // setup output | |
| 145 ParameterBlock pb3 = new ParameterBlock(); | |
| 146 pb3.addSource(img); | |
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147 pb3.add(ostream); |
| 73 | 148 if (mt == "image/jpeg") { |
| 149 pb3.add("JPEG"); | |
| 150 } else if (mt == "image/png") { | |
| 151 pb3.add("PNG"); | |
| 152 } else { | |
| 153 // unknown mime type | |
| 154 util.dprintln(2, "ERROR(writeImage): Unknown mime type " + mt); | |
| 155 throw new FileOpException("Unknown mime type: " + mt); | |
| 156 } | |
| 157 // render output | |
| 158 JAI.create("ImageWrite", pb3); | |
| 159 } catch (IOException e) { | |
| 160 throw new FileOpException("Error writing image."); | |
| 161 } | |
| 162 } | |
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163 |
| 89 | 164 /* (non-Javadoc) |
| 148 | 165 * @see java.lang.Object#finalize() |
| 166 */ | |
| 167 protected void finalize() throws Throwable { | |
| 168 //System.out.println("FIN de JAIImageLoaderDocuImage!"); | |
| 169 // we must dispose the ImageReader because it keeps the filehandle open! | |
| 170 reader.dispose(); | |
| 171 reader = null; | |
| 172 img = null; | |
| 173 super.finalize(); | |
| 174 } | |
| 175 | |
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176 } |