Mercurial > hg > digilib-old
annotate common/src/main/java/digilib/image/DocuImageImpl.java @ 927:95d8184995ab
fixed bug with next/prev page.
| author | robcast |
|---|---|
| date | Mon, 19 Dec 2011 23:42:31 +0100 |
| parents | 28d007673346 |
| children | 4e368c85cce4 |
| rev | line source |
|---|---|
| 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 |
| 181 | 32 import org.apache.log4j.Logger; |
| 33 | |
| 34 import digilib.io.FileOpException; | |
| 566 | 35 import digilib.io.ImageInput; |
| 596 | 36 import digilib.util.ImageSize; |
| 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. */ |
| 864 | 55 public static final double epsilon = 1e-5; |
| 1 | 56 |
| 570 | 57 /** image size */ |
| 58 protected ImageSize imgSize = null; | |
| 59 | |
| 588 | 60 /** ImageInput that was read */ |
| 61 protected ImageInput input; | |
| 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. |
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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 |
| 588 | 102 /* (non-Javadoc) |
| 103 * @see digilib.image.DocuImage#getMimetype() | |
| 104 */ | |
| 86 | 105 public String getMimetype() { |
| 588 | 106 if (input != null) { |
| 107 return input.getMimetype(); | |
| 108 } | |
| 109 return null; | |
| 86 | 110 } |
| 111 | |
| 564 | 112 /* (non-Javadoc) |
| 113 * @see digilib.image.DocuImage#identify(digilib.io.ImageFile) | |
| 114 */ | |
| 588 | 115 public ImageInput identify(ImageInput ii) throws IOException { |
| 564 | 116 // just a do-nothing implementation |
| 117 return null; | |
| 118 } | |
| 119 | |
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120 public void rotate(double angle) throws ImageOpException { |
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121 // just a do-nothing implementation |
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122 } |
| 1 | 123 |
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124 public void mirror(double angle) throws ImageOpException { |
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125 // just a do-nothing implementation |
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126 } |
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127 |
| 86 | 128 public void enhance(float mult, float add) throws ImageOpException { |
| 85 | 129 // just a do-nothing implementation |
| 130 } | |
| 131 | |
| 132 public boolean isSubimageSupported() { | |
| 86 | 133 // partial loading not supported per default |
| 85 | 134 return false; |
| 135 } | |
| 136 | |
| 588 | 137 public void loadSubimage(ImageInput ii, Rectangle region, int subsample) |
| 85 | 138 throws FileOpException { |
| 139 // empty implementation | |
| 140 } | |
| 141 | |
| 86 | 142 public void enhanceRGB(float[] rgbm, float[] rgba) |
| 143 throws ImageOpException { | |
| 144 // emtpy implementation | |
| 145 } | |
| 146 | |
| 829 | 147 public void colorOp(ColorOp op) throws ImageOpException { |
| 148 // emtpy implementation | |
| 149 } | |
| 150 | |
| 207 | 151 public void dispose() { |
| 464 | 152 // emtpy implementation |
| 153 } | |
| 154 | |
| 531 | 155 public Iterator<String> getSupportedFormats() { |
| 156 List<String> empty = new LinkedList<String>(); | |
| 464 | 157 return empty.iterator(); |
| 207 | 158 } |
| 533 | 159 |
| 160 public void crop(int xoff, int yoff, int width, int height) | |
| 161 throws ImageOpException { | |
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162 // emtpy implementation |
| 533 | 163 } |
| 164 | |
| 165 public Image getAwtImage() { | |
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166 // emtpy implementation |
| 533 | 167 return null; |
| 168 } | |
| 169 | |
| 170 public int getHeight() { | |
| 570 | 171 ImageSize is = getSize(); |
| 172 if (is != null) { | |
| 173 return is.getHeight(); | |
| 174 } | |
| 533 | 175 return 0; |
| 176 } | |
| 207 | 177 |
| 533 | 178 public int getWidth() { |
| 570 | 179 ImageSize is = getSize(); |
| 180 if (is != null) { | |
| 181 return is.getWidth(); | |
| 182 } | |
| 533 | 183 return 0; |
| 184 } | |
| 185 | |
| 570 | 186 public ImageSize getSize() { |
| 187 return imgSize; | |
| 188 } | |
| 189 | |
| 588 | 190 public abstract void loadImage(ImageInput ii) throws FileOpException; |
| 533 | 191 |
| 588 | 192 public abstract void scale(double scaleX, double scaleY) throws ImageOpException; |
| 533 | 193 |
| 588 | 194 public abstract void writeImage(String mt, OutputStream ostream) |
| 906 | 195 throws ImageOpException, FileOpException; |
| 829 | 196 |
| 533 | 197 |
| 1 | 198 } |