Mercurial > hg > digilib-old
annotate servlet/src/digilib/image/ImageLoaderDocuImage.java @ 138:d18b0ff52b07
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| author | robcast |
|---|---|
| date | Sat, 12 Jul 2003 01:26:56 +0200 |
| parents | a32e8c80e2f2 |
| children | c878ea574c29 |
| rev | line source |
|---|---|
| 1 | 1 /* ImageLoaderDocuImage -- Image class implementation using JDK 1.4 ImageLoader |
| 2 | |
| 3 Digital Image Library servlet components | |
| 4 | |
| 85 | 5 Copyright (C) 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 | |
| 17 Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA | |
| 18 | |
| 19 */ | |
| 20 | |
| 21 package digilib.image; | |
| 22 | |
| 85 | 23 import java.awt.Rectangle; |
| 73 | 24 import java.awt.geom.AffineTransform; |
| 101 | 25 import java.awt.geom.Rectangle2D; |
| 73 | 26 import java.awt.image.AffineTransformOp; |
| 27 import java.awt.image.BufferedImage; | |
| 85 | 28 import java.awt.image.RescaleOp; |
| 73 | 29 import java.io.File; |
| 30 import java.io.IOException; | |
|
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31 import java.io.OutputStream; |
| 89 | 32 import java.io.RandomAccessFile; |
| 85 | 33 import java.util.Iterator; |
| 1 | 34 |
| 73 | 35 import javax.imageio.ImageIO; |
| 85 | 36 import javax.imageio.ImageReadParam; |
| 37 import javax.imageio.ImageReader; | |
| 38 import javax.imageio.stream.ImageInputStream; | |
| 1 | 39 |
| 73 | 40 import digilib.io.FileOpException; |
| 1 | 41 |
| 73 | 42 /** Implementation of DocuImage using the ImageLoader API of Java 1.4 and Java2D. */ |
| 1 | 43 public class ImageLoaderDocuImage extends DocuImageImpl { |
| 44 | |
| 86 | 45 /** image object */ |
| 46 protected BufferedImage img; | |
| 47 /** interpolation type */ | |
| 48 protected int interpol; | |
| 49 /** ImageIO image reader */ | |
| 50 protected ImageReader reader; | |
| 51 /** File that was read */ | |
| 52 protected File imgFile; | |
| 85 | 53 |
| 54 /* loadSubimage is supported. */ | |
| 55 public boolean isSubimageSupported() { | |
| 56 return true; | |
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57 } |
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58 |
| 85 | 59 public void setQuality(int qual) { |
| 60 quality = qual; | |
| 61 // setup interpolation quality | |
| 62 if (qual > 0) { | |
| 63 util.dprintln(4, "quality q1"); | |
| 64 interpol = AffineTransformOp.TYPE_BILINEAR; | |
| 65 } else { | |
| 66 util.dprintln(4, "quality q0"); | |
| 67 interpol = AffineTransformOp.TYPE_NEAREST_NEIGHBOR; | |
| 68 } | |
| 69 } | |
| 86 | 70 |
| 85 | 71 public int getHeight() { |
| 72 int h = 0; | |
| 73 try { | |
| 74 if (img == null) { | |
| 75 h = reader.getHeight(0); | |
| 76 } else { | |
| 77 h = img.getHeight(); | |
| 78 } | |
| 79 } catch (IOException e) { | |
| 80 e.printStackTrace(); | |
| 81 } | |
| 82 return h; | |
| 83 } | |
| 84 | |
| 85 public int getWidth() { | |
| 86 int w = 0; | |
| 87 try { | |
| 88 if (img == null) { | |
| 89 w = reader.getWidth(0); | |
| 90 } else { | |
| 91 w = img.getWidth(); | |
| 92 } | |
| 93 } catch (IOException e) { | |
| 94 e.printStackTrace(); | |
| 95 } | |
| 96 return w; | |
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97 } |
| 1 | 98 |
| 86 | 99 /* load image file */ |
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100 public void loadImage(File f) throws FileOpException { |
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101 util.dprintln(10, "loadImage!"); |
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102 System.gc(); |
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103 try { |
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104 img = ImageIO.read(f); |
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105 if (img == null) { |
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106 util.dprintln(3, "ERROR(loadImage): unable to load file"); |
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107 throw new FileOpException("Unable to load File!"); |
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108 } |
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109 } catch (IOException e) { |
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110 throw new FileOpException("Error reading image."); |
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111 } |
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112 } |
| 1 | 113 |
| 86 | 114 /** Get an ImageReader for the image file. |
| 115 * | |
| 116 */ | |
| 89 | 117 public void preloadImage(File f) throws IOException { |
| 85 | 118 System.gc(); |
| 89 | 119 RandomAccessFile rf = new RandomAccessFile(f, "r"); |
| 120 ImageInputStream istream = ImageIO.createImageInputStream(rf); | |
| 121 Iterator readers = ImageIO.getImageReaders(istream); | |
| 122 reader = (ImageReader) readers.next(); | |
| 123 reader.setInput(istream); | |
| 85 | 124 if (reader == null) { |
| 125 util.dprintln(3, "ERROR(loadImage): unable to load file"); | |
| 126 throw new FileOpException("Unable to load File!"); | |
| 127 } | |
| 86 | 128 imgFile = f; |
| 85 | 129 } |
| 130 | |
| 131 /* Load an image file into the Object. */ | |
| 132 public void loadSubimage(File f, Rectangle region, int prescale) | |
| 133 throws FileOpException { | |
| 134 System.gc(); | |
| 135 try { | |
| 86 | 136 if ((reader == null) || (imgFile != f)) { |
| 85 | 137 preloadImage(f); |
| 138 } | |
| 139 // set up reader parameters | |
| 140 ImageReadParam readParam = reader.getDefaultReadParam(); | |
| 141 readParam.setSourceRegion(region); | |
| 142 readParam.setSourceSubsampling(prescale, prescale, 0, 0); | |
| 143 // read image | |
| 144 img = reader.read(0, readParam); | |
| 145 } catch (IOException e) { | |
| 146 util.dprintln(3, "ERROR(loadImage): unable to load file"); | |
| 147 throw new FileOpException("Unable to load File!"); | |
| 148 } | |
| 149 if (img == null) { | |
| 150 util.dprintln(3, "ERROR(loadImage): unable to load file"); | |
| 151 throw new FileOpException("Unable to load File!"); | |
| 152 } | |
| 153 } | |
| 154 | |
| 86 | 155 /* write image of type mt to Stream */ |
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156 public void writeImage(String mt, OutputStream ostream) |
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157 throws FileOpException { |
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158 util.dprintln(10, "writeImage!"); |
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159 try { |
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160 // setup output |
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161 String type = "png"; |
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162 if (mt == "image/jpeg") { |
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163 type = "jpeg"; |
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164 } else if (mt == "image/png") { |
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165 type = "png"; |
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166 } else { |
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167 // unknown mime type |
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168 util.dprintln(2, "ERROR(writeImage): Unknown mime type " + mt); |
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169 throw new FileOpException("Unknown mime type: " + mt); |
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170 } |
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171 // render output |
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172 if (ImageIO.write(img, type, ostream)) { |
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173 // writing was OK |
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174 return; |
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175 } else { |
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176 throw new FileOpException("Error writing image: Unknown image format!"); |
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177 } |
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178 } catch (IOException e) { |
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179 // e.printStackTrace(); |
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180 throw new FileOpException("Error writing image."); |
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181 } |
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182 } |
| 1 | 183 |
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184 public void scale(double scale) throws ImageOpException { |
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185 // setup scale |
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186 AffineTransformOp scaleOp = |
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187 new AffineTransformOp( |
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188 AffineTransform.getScaleInstance(scale, scale), |
| 85 | 189 interpol); |
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190 BufferedImage scaledImg = scaleOp.filter(img, null); |
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191 |
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192 if (scaledImg == null) { |
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193 util.dprintln(2, "ERROR(cropAndScale): error in scale"); |
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194 throw new ImageOpException("Unable to scale"); |
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195 } |
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196 img = scaledImg; |
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197 } |
| 1 | 198 |
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199 public void crop(int x_off, int y_off, int width, int height) |
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200 throws ImageOpException { |
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201 // setup Crop |
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202 BufferedImage croppedImg = img.getSubimage(x_off, y_off, width, height); |
| 1 | 203 |
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204 util.dprintln( |
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205 3, |
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206 "CROP:" + croppedImg.getWidth() + "x" + croppedImg.getHeight()); |
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207 //DEBUG |
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208 // util.dprintln(2, " time "+(System.currentTimeMillis()-startTime)+"ms"); |
| 1 | 209 |
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210 if (croppedImg == null) { |
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211 util.dprintln(2, "ERROR(cropAndScale): error in crop"); |
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212 throw new ImageOpException("Unable to crop"); |
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213 } |
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214 img = croppedImg; |
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215 } |
| 1 | 216 |
| 86 | 217 public void enhance(float mult, float add) throws ImageOpException { |
| 218 /* Only one constant should work regardless of the number of bands | |
| 219 * according to the JDK spec. | |
| 220 * Doesn't work on JDK 1.4 for OSX and Linux (at least). | |
| 85 | 221 */ |
| 86 | 222 /* RescaleOp scaleOp = |
| 223 new RescaleOp( | |
| 224 (float)mult, (float)add, | |
| 225 null); | |
| 226 scaleOp.filter(img, img); | |
| 227 */ | |
| 228 /* The number of constants must match the number of bands in the image. | |
| 229 */ | |
| 230 int ncol = img.getColorModel().getNumColorComponents(); | |
| 231 float[] dm = new float[ncol]; | |
| 232 float[] da = new float[ncol]; | |
| 233 for (int i = 0; i < ncol; i++) { | |
| 234 dm[i] = (float) mult; | |
| 235 da[i] = (float) add; | |
| 85 | 236 } |
| 86 | 237 RescaleOp scaleOp = new RescaleOp(dm, da, null); |
| 85 | 238 scaleOp.filter(img, img); |
| 239 | |
| 240 } | |
| 241 | |
| 86 | 242 public void enhanceRGB(float[] rgbm, float[] rgba) |
| 243 throws ImageOpException { | |
| 244 /* The number of constants must match the number of bands in the image. | |
| 245 * We do only 3 (RGB) bands. | |
| 246 */ | |
| 247 int ncol = img.getColorModel().getNumColorComponents(); | |
| 248 if ((ncol != 3) || (rgbm.length != 3) || (rgba.length != 3)) { | |
| 249 util.dprintln( | |
| 250 2, | |
| 251 "ERROR(enhance): unknown number of color bands or coefficients (" | |
| 252 + ncol | |
| 253 + ")"); | |
| 254 return; | |
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255 } |
| 89 | 256 RescaleOp scaleOp = |
| 257 new RescaleOp(rgbOrdered(rgbm), rgbOrdered(rgba), null); | |
| 86 | 258 scaleOp.filter(img, img); |
| 259 } | |
| 260 | |
| 261 /** Ensures that the array f is in the right order to map the images RGB components. | |
| 262 */ | |
| 263 public float[] rgbOrdered(float[] fa) { | |
| 264 float[] fb = new float[3]; | |
| 265 int t = img.getType(); | |
| 266 if ((t == BufferedImage.TYPE_3BYTE_BGR) | |
| 267 || (t == BufferedImage.TYPE_4BYTE_ABGR) | |
| 268 || (t == BufferedImage.TYPE_4BYTE_ABGR_PRE)) { | |
| 269 // BGR Type (actually it looks like RBG...) | |
| 270 fb[0] = fa[0]; | |
| 271 fb[1] = fa[2]; | |
| 272 fb[2] = fa[1]; | |
| 273 } else { | |
| 274 fb = fa; | |
| 275 } | |
| 276 return fb; | |
| 85 | 277 } |
| 278 | |
| 101 | 279 public void rotate(double angle) |
| 280 throws ImageOpException { | |
| 89 | 281 // setup rotation |
| 282 double rangle = Math.toRadians(angle); | |
| 101 | 283 // create offset to make shure the rotated image has no negative coordinates |
| 284 double w = img.getWidth(); | |
| 285 double h = img.getHeight(); | |
| 103 | 286 AffineTransform trafo = new AffineTransform(); |
| 287 // center of rotation | |
| 288 double x = (w / 2); | |
| 289 double y = (h / 2); | |
| 101 | 290 trafo.rotate(rangle, x, y); |
| 103 | 291 // try rotation to see how far we're out of bounds |
| 292 AffineTransformOp rotOp = new AffineTransformOp(trafo, interpol); | |
| 293 Rectangle2D rotbounds = rotOp.getBounds2D(img); | |
| 294 double xoff = rotbounds.getX(); | |
| 295 double yoff = rotbounds.getY(); | |
| 296 // move image back in line | |
| 297 trafo.preConcatenate(AffineTransform.getTranslateInstance(-xoff, -yoff)); | |
| 101 | 298 // transform image |
| 103 | 299 rotOp = new AffineTransformOp(trafo, interpol); |
| 89 | 300 BufferedImage rotImg = rotOp.filter(img, null); |
| 101 | 301 // calculate new bounding box |
| 103 | 302 //Rectangle2D bounds = rotOp.getBounds2D(img); |
| 86 | 303 |
| 89 | 304 if (rotImg == null) { |
| 305 util.dprintln(2, "ERROR: error in rotate"); | |
| 306 throw new ImageOpException("Unable to rotate"); | |
| 307 } | |
| 103 | 308 img = rotImg; |
| 101 | 309 // crop new image (with self-made rounding) |
| 103 | 310 /* img = |
| 101 | 311 rotImg.getSubimage( |
| 312 (int) (bounds.getX()+0.5), | |
| 313 (int) (bounds.getY()+0.5), | |
| 314 (int) (bounds.getWidth()+0.5), | |
| 315 (int) (bounds.getHeight()+0.5)); | |
| 103 | 316 */ |
| 86 | 317 } |
| 85 | 318 |
| 89 | 319 public void mirror(double angle) throws ImageOpException { |
| 320 // setup mirror | |
| 321 double mx = 1; | |
| 322 double my = 1; | |
| 323 double tx = 0; | |
| 324 double ty = 0; | |
| 325 if (Math.abs(angle - 0) < epsilon) { | |
| 326 // 0 degree | |
| 327 mx = -1; | |
| 328 tx = getWidth(); | |
| 329 } else if (Math.abs(angle - 90) < epsilon) { | |
| 330 // 90 degree | |
| 331 my = -1; | |
| 332 ty = getHeight(); | |
| 333 } else if (Math.abs(angle - 180) < epsilon) { | |
| 334 // 180 degree | |
| 335 mx = -1; | |
| 336 tx = getWidth(); | |
| 337 } else if (Math.abs(angle - 270) < epsilon) { | |
| 338 // 270 degree | |
| 339 my = -1; | |
| 340 ty = getHeight(); | |
| 341 } else if (Math.abs(angle - 360) < epsilon) { | |
| 342 // 360 degree | |
| 343 mx = -1; | |
| 344 tx = getWidth(); | |
| 345 } | |
| 346 AffineTransformOp mirOp = | |
| 347 new AffineTransformOp( | |
| 348 new AffineTransform(mx, 0, 0, my, tx, ty), | |
| 349 interpol); | |
| 350 BufferedImage mirImg = mirOp.filter(img, null); | |
| 351 | |
| 352 if (mirImg == null) { | |
| 353 util.dprintln(2, "ERROR: error in mirror"); | |
| 354 throw new ImageOpException("Unable to mirror"); | |
| 355 } | |
| 356 img = mirImg; | |
|
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|
357 } |
| 86 | 358 |
| 1 | 359 } |