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comparison servlet/src/digilib/image/JAIImageLoaderDocuImage.java @ 85:4e6757e8ccd4

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New enhanced ImageLoader stuff. Now uses Subsampling and image regions on read. Now implements enhance, rotate and mirror for ImageLoader/Java2D
author robcast
date Thu, 27 Feb 2003 15:07:29 +0100
parents 63c8186455c1
children 6d35c945a5d6
comparison
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84:ed1b698b4f0a 85:4e6757e8ccd4
1 /* JAIImageLoaderDocuImage -- Image class implementation using JAI's ImageLoader Plugin 1 /* JAIImageLoaderDocuImage -- Image class implementation using JAI's ImageLoader Plugin
2 2
3 Digital Image Library servlet components 3 Digital Image Library servlet components
4 4
5 Copyright (C) 2001, 2002 Robert Casties (robcast@mail.berlios.de) 5 Copyright (C) 2002, 2003 Robert Casties (robcast@mail.berlios.de)
6 6
7 This program is free software; you can redistribute it and/or modify it 7 This program is free software; you can redistribute it and/or modify it
8 under the terms of the GNU General Public License as published by the 8 under the terms of the GNU General Public License as published by the
9 Free Software Foundation; either version 2 of the License, or (at your 9 Free Software Foundation; either version 2 of the License, or (at your
10 option) any later version. 10 option) any later version.
18 18
19 */ 19 */
20 20
21 package digilib.image; 21 package digilib.image;
22 22
23 import java.awt.Rectangle;
23 import java.awt.image.renderable.ParameterBlock; 24 import java.awt.image.renderable.ParameterBlock;
24 import java.io.File; 25 import java.io.File;
25 import java.io.IOException; 26 import java.io.IOException;
26 import java.io.OutputStream; 27 import java.io.OutputStream;
28 import java.util.Iterator;
27 29
30 import javax.imageio.ImageIO;
31 import javax.imageio.ImageReadParam;
32 import javax.imageio.ImageReader;
33 import javax.imageio.stream.ImageInputStream;
28 import javax.media.jai.JAI; 34 import javax.media.jai.JAI;
35
36 import com.sun.media.jai.operator.ImageReadDescriptor;
29 37
30 import digilib.io.FileOpException; 38 import digilib.io.FileOpException;
31 39
32 /** DocuImage implementation using the Java Advanced Imaging API and the ImageLoader 40 /** DocuImage implementation using the Java Advanced Imaging API and the ImageLoader
33 * API of Java 1.4. 41 * API of Java 1.4.
34 */ 42 */
35 public class JAIImageLoaderDocuImage extends JAIDocuImage { 43 public class JAIImageLoaderDocuImage extends JAIDocuImage {
36 44
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 }
37 85
38 /* Load an image file into the Object. */ 86 /* Load an image file into the Object. */
39 public void loadImage(File f) throws FileOpException { 87 public void loadImage(File f) throws FileOpException {
40 System.gc(); 88 System.gc();
41 img = JAI.create("ImageRead", f.getAbsolutePath()); 89 img = JAI.create("ImageRead", f.getAbsolutePath());
42 if (img == null) { 90 if (img == null) {
91 util.dprintln(3, "ERROR(loadImage): unable to load file");
92 throw new FileOpException("Unable to load File!");
93 }
94 }
95
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) {
43 util.dprintln(3, "ERROR(loadImage): unable to load file"); 147 util.dprintln(3, "ERROR(loadImage): unable to load file");
44 throw new FileOpException("Unable to load File!"); 148 throw new FileOpException("Unable to load File!");
45 } 149 }
46 } 150 }
47 151