Mercurial > hg > digilib-old
annotate servlet/src/digilib/image/DocuImageImpl.java @ 629:b426efcc8a8e jquery
questions about display()...
author | robcast |
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date | Tue, 18 Jan 2011 12:51:51 +0100 |
parents | fd2ef7e46119 |
children | beeedf90cb81 |
rev | line source |
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1 | 1 /* DocuImage -- General image interface class implementation |
2 | |
3 Digital Image Library servlet components | |
4 | |
85 | 5 Copyright (C) 2001, 2002, 2003 Robert Casties (robcast@mail.berlios.de) |
1 | 6 |
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 | |
9 Free Software Foundation; either version 2 of the License, or (at your | |
10 option) any later version. | |
11 | |
12 Please read license.txt for the full details. A copy of the GPL | |
13 may be found at http://www.gnu.org/copyleft/lgpl.html | |
14 | |
15 You should have received a copy of the GNU General Public License | |
16 along with this program; if not, write to the Free Software | |
73 | 17 Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA |
1 | 18 |
19 */ | |
20 | |
21 package digilib.image; | |
22 | |
533 | 23 import java.awt.Image; |
85 | 24 import java.awt.Rectangle; |
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25 import java.io.IOException; |
533 | 26 import java.io.OutputStream; |
464 | 27 import java.util.Iterator; |
28 import java.util.LinkedList; | |
29 import java.util.List; | |
85 | 30 |
570 | 31 import javax.servlet.ServletException; |
32 | |
181 | 33 import org.apache.log4j.Logger; |
34 | |
35 import digilib.io.FileOpException; | |
159 | 36 import digilib.io.ImageFile; |
1 | 37 |
73 | 38 /** Simple abstract implementation of the <code>DocuImage</code> interface. |
39 * | |
40 * This implementation provides basic functionality for the utility methods like | |
562 | 41 * <code>getKnownFileTypes</code>. Image methods like |
73 | 42 * <code>loadImage</code>, <code>writeImage</code>, <code>getWidth</code>, |
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43 * <code>getHeight</code>, <code>crop</code> and <code>scale</code> must be |
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44 * implemented by derived classes. |
73 | 45 */ |
1 | 46 public abstract class DocuImageImpl implements DocuImage { |
47 | |
181 | 48 /** logger */ |
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49 protected static final Logger logger = Logger.getLogger(DocuImage.class); |
181 | 50 |
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51 /** Interpolation quality. */ |
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52 protected int quality = 0; |
85 | 53 |
86 | 54 /** epsilon for float comparisons. */ |
85 | 55 public final double epsilon = 1e-5; |
86 | 56 |
57 /** image mime-type */ | |
58 protected String mimeType = null; | |
1 | 59 |
570 | 60 /** image size */ |
61 protected ImageSize imgSize = null; | |
62 | |
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63 /** |
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64 * Returns the quality. |
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65 * @return int |
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66 */ |
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67 public int getQuality() { |
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68 return quality; |
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69 } |
1 | 70 |
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71 /** |
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72 * Sets the quality. |
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73 * @param quality The quality to set |
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74 */ |
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75 public void setQuality(int quality) { |
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76 this.quality = quality; |
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77 } |
1 | 78 |
564 | 79 /** Crop and scale the current image. |
79
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80 * |
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81 * The current image is cropped to a rectangle of width, height at position |
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82 * x_off, y_off. The resulting image is scaled by the factor scale using the |
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83 * interpolation quality qual (0=worst). |
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84 * |
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85 * @param x_off X offset of the crop rectangle in pixel. |
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86 * @param y_off Y offset of the crop rectangle in pixel. |
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87 * @param width Width of the crop rectangle in pixel. |
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88 * @param height Height of the crop rectangle in pixel. |
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89 * @param scale Scaling factor. |
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90 * @param qual Interpolation quality (0=worst). |
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91 * @throws ImageOpException Exception thrown on any error. |
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92 */ |
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93 public void cropAndScale( |
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94 int x_off, int y_off, int width, int height, double scale, int qual) |
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95 throws ImageOpException { |
562 | 96 // default implementation: first crop, then scale |
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97 setQuality(qual); |
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98 crop(x_off, y_off, width, height); |
149 | 99 scale(scale, scale); |
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100 } |
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101 |
86 | 102 public String getMimetype() { |
103 return mimeType; | |
104 } | |
105 | |
564 | 106 /* (non-Javadoc) |
107 * @see digilib.image.DocuImage#identify(digilib.io.ImageFile) | |
108 */ | |
109 public ImageFile identify(ImageFile imgf) throws IOException { | |
110 // just a do-nothing implementation | |
111 return null; | |
112 } | |
113 | |
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114 public void rotate(double angle) throws ImageOpException { |
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115 // just a do-nothing implementation |
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116 } |
1 | 117 |
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118 public void mirror(double angle) throws ImageOpException { |
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119 // just a do-nothing implementation |
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120 } |
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121 |
86 | 122 public void enhance(float mult, float add) throws ImageOpException { |
85 | 123 // just a do-nothing implementation |
124 } | |
125 | |
126 public boolean isSubimageSupported() { | |
86 | 127 // partial loading not supported per default |
85 | 128 return false; |
129 } | |
130 | |
159 | 131 public void loadSubimage(ImageFile f, Rectangle region, int subsample) |
85 | 132 throws FileOpException { |
133 // empty implementation | |
134 } | |
135 | |
86 | 136 public void enhanceRGB(float[] rgbm, float[] rgba) |
137 throws ImageOpException { | |
138 // emtpy implementation | |
139 } | |
140 | |
207 | 141 public void dispose() { |
464 | 142 // emtpy implementation |
143 } | |
144 | |
531 | 145 public Iterator<String> getSupportedFormats() { |
146 List<String> empty = new LinkedList<String>(); | |
464 | 147 return empty.iterator(); |
207 | 148 } |
533 | 149 |
150 public void crop(int xoff, int yoff, int width, int height) | |
151 throws ImageOpException { | |
152 // TODO Auto-generated method stub | |
153 } | |
154 | |
155 public Image getAwtImage() { | |
156 // TODO Auto-generated method stub | |
157 return null; | |
158 } | |
159 | |
160 public int getHeight() { | |
570 | 161 ImageSize is = getSize(); |
162 if (is != null) { | |
163 return is.getHeight(); | |
164 } | |
533 | 165 return 0; |
166 } | |
207 | 167 |
533 | 168 public int getWidth() { |
570 | 169 ImageSize is = getSize(); |
170 if (is != null) { | |
171 return is.getWidth(); | |
172 } | |
533 | 173 return 0; |
174 } | |
175 | |
570 | 176 public ImageSize getSize() { |
177 return imgSize; | |
178 } | |
179 | |
533 | 180 public void loadImage(ImageFile f) throws FileOpException { |
181 // TODO Auto-generated method stub | |
182 | |
183 } | |
184 | |
185 public void scale(double scaleX, double scaleY) throws ImageOpException { | |
186 // TODO Auto-generated method stub | |
187 | |
188 } | |
189 | |
190 public void writeImage(String mt, OutputStream ostream) | |
570 | 191 throws ServletException, ImageOpException { |
533 | 192 // TODO Auto-generated method stub |
193 } | |
194 | |
1 | 195 } |