Mercurial > hg > digilib-old
annotate servlet/src/digilib/image/JAIImageLoaderDocuImage.java @ 87:5d44cd2481a5
New version 1.8b4.
Utils without static debuglevel.
| author | robcast |
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| date | Mon, 17 Mar 2003 15:23:17 +0100 |
| parents | 4e6757e8ccd4 |
| children | 6d35c945a5d6 |
| 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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5ea1999befd4
New JAI ImageLoader plugin. Currently uses first beta version of the plugin.
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2 |
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5ea1999befd4
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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New JAI ImageLoader plugin. Currently uses first beta version of the plugin.
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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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New JAI ImageLoader plugin. Currently uses first beta version of the plugin.
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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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5ea1999befd4
New JAI ImageLoader plugin. Currently uses first beta version of the plugin.
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11 |
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5ea1999befd4
New JAI ImageLoader plugin. Currently uses first beta version of the plugin.
robcast
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12 Please read license.txt for the full details. A copy of the GPL |
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5ea1999befd4
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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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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New JAI ImageLoader plugin. Currently uses first beta version of the plugin.
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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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New JAI ImageLoader plugin. Currently uses first beta version of the plugin.
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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 |
| 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; |
| 85 | 28 import java.util.Iterator; |
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29 |
| 85 | 30 import javax.imageio.ImageIO; |
| 31 import javax.imageio.ImageReadParam; | |
| 32 import javax.imageio.ImageReader; | |
| 33 import javax.imageio.stream.ImageInputStream; | |
| 73 | 34 import javax.media.jai.JAI; |
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35 |
| 85 | 36 import com.sun.media.jai.operator.ImageReadDescriptor; |
| 37 | |
| 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 |
| 85 | 45 // ImageIO image reader |
| 46 ImageReader reader; | |
| 47 | |
| 48 /* preload is supported. */ | |
| 49 public boolean isPreloadSupported() { | |
| 50 return true; | |
| 51 } | |
| 52 | |
| 53 /* loadSubimage is supported. */ | |
| 54 public boolean isSubimageSupported() { | |
| 55 return true; | |
| 56 } | |
| 57 | |
| 58 public int getHeight() { | |
| 59 int h = 0; | |
| 60 try { | |
| 61 if (img == null) { | |
| 62 h = reader.getHeight(0); | |
| 63 } else { | |
| 64 h = img.getHeight(); | |
| 65 } | |
| 66 } catch (IOException e) { | |
| 67 e.printStackTrace(); | |
| 68 } | |
| 69 return h; | |
| 70 } | |
| 71 | |
| 72 public int getWidth() { | |
| 73 int w = 0; | |
| 74 try { | |
| 75 if (img == null) { | |
| 76 w = reader.getWidth(0); | |
| 77 } else { | |
| 78 w = img.getWidth(); | |
| 79 } | |
| 80 } catch (IOException e) { | |
| 81 e.printStackTrace(); | |
| 82 } | |
| 83 return w; | |
| 84 } | |
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New JAI ImageLoader plugin. Currently uses first beta version of the plugin.
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85 |
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86 /* Load an image file into the Object. */ |
| 73 | 87 public void loadImage(File f) throws FileOpException { |
| 88 System.gc(); | |
| 89 img = JAI.create("ImageRead", f.getAbsolutePath()); | |
| 90 if (img == null) { | |
| 91 util.dprintln(3, "ERROR(loadImage): unable to load file"); | |
| 92 throw new FileOpException("Unable to load File!"); | |
| 93 } | |
| 94 } | |
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New JAI ImageLoader plugin. Currently uses first beta version of the plugin.
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95 |
| 85 | 96 /* Load an image file into the Object. */ |
| 97 public void loadSubimage(File f, Rectangle region, int prescale) | |
| 98 throws FileOpException { | |
| 99 System.gc(); | |
| 100 try { | |
| 101 if (reader == null) { | |
| 102 preloadImage(f); | |
| 103 } | |
| 104 ImageInputStream istream = (ImageInputStream) reader.getInput(); | |
| 105 ImageReadParam readParam = reader.getDefaultReadParam(); | |
| 106 readParam.setSourceRegion(region); | |
| 107 readParam.setSourceSubsampling(prescale, prescale, 0, 0); | |
| 108 /* Parameter for ImageRead operation: | |
| 109 Input, ImageChoice, ReadMetadata, ReadThumbnails, VerifyInput, | |
| 110 Listeners, Locale, ReadParam, Reader, RenderingHints | |
| 111 */ | |
| 112 img = | |
| 113 ImageReadDescriptor.create( | |
| 114 istream, | |
| 115 new Integer(0), | |
| 116 Boolean.TRUE, | |
| 117 Boolean.FALSE, | |
| 118 Boolean.FALSE, | |
| 119 null, | |
| 120 null, | |
| 121 readParam, | |
| 122 reader, | |
| 123 null); | |
| 124 } catch (IOException e) { | |
| 125 util.dprintln(3, "ERROR(loadImage): unable to load file"); | |
| 126 throw new FileOpException("Unable to load File!"); | |
| 127 } | |
| 128 if (img == null) { | |
| 129 util.dprintln(3, "ERROR(loadImage): unable to load file"); | |
| 130 throw new FileOpException("Unable to load File!"); | |
| 131 } | |
| 132 } | |
| 133 | |
| 134 /* Get an ImageReader for the image file. */ | |
| 135 public void preloadImage(File f) throws FileOpException { | |
| 136 System.gc(); | |
| 137 try { | |
| 138 ImageInputStream istream = ImageIO.createImageInputStream(f); | |
| 139 Iterator readers = ImageIO.getImageReaders(istream); | |
| 140 reader = (ImageReader) readers.next(); | |
| 141 reader.setInput(istream); | |
| 142 } catch (IOException e) { | |
| 143 util.dprintln(3, "ERROR(loadImage): unable to load file"); | |
| 144 throw new FileOpException("Unable to load File!" + e); | |
| 145 } | |
| 146 if (reader == null) { | |
| 147 util.dprintln(3, "ERROR(loadImage): unable to load file"); | |
| 148 throw new FileOpException("Unable to load File!"); | |
| 149 } | |
| 150 } | |
| 151 | |
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152 /* Write the current image to an OutputStream. */ |
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153 public void writeImage(String mt, OutputStream ostream) |
| 73 | 154 throws FileOpException { |
| 155 try { | |
| 156 // setup output | |
| 157 ParameterBlock pb3 = new ParameterBlock(); | |
| 158 pb3.addSource(img); | |
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159 pb3.add(ostream); |
| 73 | 160 if (mt == "image/jpeg") { |
| 161 pb3.add("JPEG"); | |
| 162 } else if (mt == "image/png") { | |
| 163 pb3.add("PNG"); | |
| 164 } else { | |
| 165 // unknown mime type | |
| 166 util.dprintln(2, "ERROR(writeImage): Unknown mime type " + mt); | |
| 167 throw new FileOpException("Unknown mime type: " + mt); | |
| 168 } | |
| 169 // render output | |
| 170 JAI.create("ImageWrite", pb3); | |
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171 |
| 73 | 172 } catch (IOException e) { |
| 173 throw new FileOpException("Error writing image."); | |
| 174 } | |
| 175 } | |
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176 |
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177 } |