Mercurial > hg > digilib-old
annotate servlet/src/digilib/image/JAIImageLoaderDocuImage.java @ 142:f52a7664a807
Servlet version 1.12b3
- JAIImageLoaderDocuImage working again
- smoother scaling with JAI and JAIImageLoader
- Quality default now 1
| author | robcast |
|---|---|
| date | Mon, 18 Aug 2003 11:38:15 +0200 |
| parents | 6d35c945a5d6 |
| children | 837a633a0407 |
| 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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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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5ea1999befd4
New JAI ImageLoader plugin. Currently uses first beta version of the plugin.
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9 Free Software Foundation; either version 2 of the License, or (at your |
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5ea1999befd4
New JAI ImageLoader plugin. Currently uses first beta version of the plugin.
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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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5ea1999befd4
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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5ea1999befd4
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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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 |
| 89 | 23 import java.awt.Dimension; |
| 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; | |
| 35 import javax.imageio.stream.ImageInputStream; | |
| 73 | 36 import javax.media.jai.JAI; |
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37 |
| 89 | 38 import digilib.io.DocuFile; |
| 73 | 39 import digilib.io.FileOpException; |
| 89 | 40 import digilib.io.FileOps; |
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41 |
| 73 | 42 /** DocuImage implementation using the Java Advanced Imaging API and the ImageLoader |
| 43 * API of Java 1.4. | |
| 44 */ | |
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45 public class JAIImageLoaderDocuImage extends JAIDocuImage { |
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46 |
| 89 | 47 /** ImageIO image reader */ |
| 48 protected ImageReader reader; | |
| 49 /** current image file */ | |
| 50 protected File imgFile; | |
| 85 | 51 |
| 52 /* loadSubimage is supported. */ | |
| 53 public boolean isSubimageSupported() { | |
| 54 return true; | |
| 55 } | |
| 56 | |
| 57 public int getHeight() { | |
| 58 int h = 0; | |
| 59 try { | |
| 60 if (img == null) { | |
| 61 h = reader.getHeight(0); | |
| 62 } else { | |
| 63 h = img.getHeight(); | |
| 64 } | |
| 65 } catch (IOException e) { | |
| 66 e.printStackTrace(); | |
| 67 } | |
| 68 return h; | |
| 69 } | |
| 70 | |
| 71 public int getWidth() { | |
| 72 int w = 0; | |
| 73 try { | |
| 74 if (img == null) { | |
| 75 w = reader.getWidth(0); | |
| 76 } else { | |
| 77 w = img.getWidth(); | |
| 78 } | |
| 79 } catch (IOException e) { | |
| 80 e.printStackTrace(); | |
| 81 } | |
| 82 return w; | |
| 83 } | |
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84 |
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85 /* Load an image file into the Object. */ |
| 73 | 86 public void loadImage(File f) throws FileOpException { |
| 87 System.gc(); | |
| 88 img = JAI.create("ImageRead", f.getAbsolutePath()); | |
| 89 if (img == null) { | |
| 90 util.dprintln(3, "ERROR(loadImage): unable to load file"); | |
| 91 throw new FileOpException("Unable to load File!"); | |
| 92 } | |
| 93 } | |
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94 |
| 142 | 95 /* Get an ImageReader for the image file. */ |
| 96 public void preloadImage(File f) throws IOException { | |
| 97 System.gc(); | |
| 98 RandomAccessFile rf = new RandomAccessFile(f, "r"); | |
| 99 ImageInputStream istream = ImageIO.createImageInputStream(rf); | |
| 100 Iterator readers = ImageIO.getImageReaders(istream); | |
| 101 reader = (ImageReader) readers.next(); | |
| 102 reader.setInput(istream); | |
| 103 if (reader == null) { | |
| 104 util.dprintln(3, "ERROR(loadImage): unable to load file"); | |
| 105 throw new FileOpException("Unable to load File!"); | |
| 106 } | |
| 107 } | |
| 108 | |
| 85 | 109 /* Load an image file into the Object. */ |
| 110 public void loadSubimage(File f, Rectangle region, int prescale) | |
| 111 throws FileOpException { | |
| 112 System.gc(); | |
| 113 try { | |
| 89 | 114 if ((reader == null) || (imgFile != f)) { |
| 85 | 115 preloadImage(f); |
| 116 } | |
| 117 ImageInputStream istream = (ImageInputStream) reader.getInput(); | |
| 118 ImageReadParam readParam = reader.getDefaultReadParam(); | |
| 119 readParam.setSourceRegion(region); | |
| 120 readParam.setSourceSubsampling(prescale, prescale, 0, 0); | |
| 142 | 121 img = reader.read(0, readParam); |
| 122 /* JAI imageread seems to ignore the readParam :-( | |
| 89 | 123 ParameterBlockJAI pb = new ParameterBlockJAI("imageread"); |
| 124 pb.setParameter("Input", istream); | |
| 125 pb.setParameter("ReadParam", readParam); | |
| 126 pb.setParameter("Reader", reader); | |
| 127 img = JAI.create("imageread", pb); | |
| 142 | 128 */ |
| 85 | 129 } catch (IOException e) { |
| 130 util.dprintln(3, "ERROR(loadImage): unable to load file"); | |
| 131 throw new FileOpException("Unable to load File!"); | |
| 132 } | |
| 133 if (img == null) { | |
| 134 util.dprintln(3, "ERROR(loadImage): unable to load file"); | |
| 135 throw new FileOpException("Unable to load File!"); | |
| 136 } | |
| 89 | 137 imgFile = f; |
| 85 | 138 } |
| 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) |
| 165 * @see digilib.image.DocuImage#checkFile(digilib.io.DocuFile) | |
| 166 */ | |
| 167 public boolean checkFile(DocuFile f) throws IOException { | |
| 168 // see if f is already loaded | |
| 169 if ((reader == null) || (imgFile != f.getFile())) { | |
| 170 preloadImage(f.getFile()); | |
| 171 } | |
| 172 Dimension d = new Dimension(); | |
| 173 d.setSize(reader.getWidth(0), reader.getHeight(0)); | |
| 174 f.setSize(d); | |
| 175 // String t = reader.getFormatName(); | |
| 176 String t = FileOps.mimeForFile(f.getFile()); | |
| 177 f.setMimetype(t); | |
| 178 f.setChecked(true); | |
| 179 return true; | |
| 180 } | |
| 181 | |
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182 } |