Mercurial > hg > digilib-old
annotate servlet/src/digilib/image/ImageLoaderDocuImage.java @ 140:c878ea574c29
Servlet Version 1.12b2
- fixed small error in XML config parser
- improved high quality scaling with minSubsample parameter
| author | robcast |
|---|---|
| date | Fri, 15 Aug 2003 23:52:20 +0200 |
| parents | a32e8c80e2f2 |
| children | d87a7e2515af |
| 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(); | |
| 140 | 123 /* are there more readers? |
| 124 System.out.println("this reader: " + reader.getClass()); | |
| 125 while (readers.hasNext()) { | |
| 126 System.out.println("next reader: " + readers.next().getClass()); | |
| 127 } | |
| 128 */ | |
| 89 | 129 reader.setInput(istream); |
| 85 | 130 if (reader == null) { |
| 131 util.dprintln(3, "ERROR(loadImage): unable to load file"); | |
| 132 throw new FileOpException("Unable to load File!"); | |
| 133 } | |
| 86 | 134 imgFile = f; |
| 85 | 135 } |
| 136 | |
| 137 /* Load an image file into the Object. */ | |
| 138 public void loadSubimage(File f, Rectangle region, int prescale) | |
| 139 throws FileOpException { | |
| 140 System.gc(); | |
| 141 try { | |
| 86 | 142 if ((reader == null) || (imgFile != f)) { |
| 85 | 143 preloadImage(f); |
| 144 } | |
| 145 // set up reader parameters | |
| 146 ImageReadParam readParam = reader.getDefaultReadParam(); | |
| 147 readParam.setSourceRegion(region); | |
| 148 readParam.setSourceSubsampling(prescale, prescale, 0, 0); | |
| 149 // read image | |
| 150 img = reader.read(0, readParam); | |
| 151 } catch (IOException e) { | |
| 152 util.dprintln(3, "ERROR(loadImage): unable to load file"); | |
| 153 throw new FileOpException("Unable to load File!"); | |
| 154 } | |
| 155 if (img == null) { | |
| 156 util.dprintln(3, "ERROR(loadImage): unable to load file"); | |
| 157 throw new FileOpException("Unable to load File!"); | |
| 158 } | |
| 159 } | |
| 160 | |
| 86 | 161 /* write image of type mt to Stream */ |
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162 public void writeImage(String mt, OutputStream ostream) |
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163 throws FileOpException { |
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164 util.dprintln(10, "writeImage!"); |
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165 try { |
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166 // setup output |
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167 String type = "png"; |
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168 if (mt == "image/jpeg") { |
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169 type = "jpeg"; |
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170 } else if (mt == "image/png") { |
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171 type = "png"; |
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172 } else { |
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173 // unknown mime type |
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174 util.dprintln(2, "ERROR(writeImage): Unknown mime type " + mt); |
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175 throw new FileOpException("Unknown mime type: " + mt); |
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176 } |
| 140 | 177 |
| 178 /* JPEG doesn't do transparency so we have to convert any RGBA image | |
| 179 * to RGB :-( | |
| 180 */ | |
| 181 if ((type == "jpeg") && (img.getColorModel().hasAlpha())) { | |
| 182 util.dprintln(2, "BARF: JPEG with transparency!!"); | |
| 183 int w = img.getWidth(); | |
| 184 int h = img.getHeight(); | |
| 185 // BufferedImage.TYPE_INT_RGB seems to be fastest (JDK1.4.1, OSX) | |
| 186 BufferedImage img2; | |
| 187 img2 = new BufferedImage(w, h, BufferedImage.TYPE_INT_RGB); | |
| 188 img2.createGraphics().drawImage(img, null, 0, 0); | |
| 189 img = img2; | |
| 190 } | |
| 191 | |
| 192 /* try ImageWriter.write | |
| 193 Iterator writers = ImageIO.getImageWritersByFormatName(type); | |
| 194 ImageWriter writer = (ImageWriter) writers.next(); | |
| 195 System.out.println("this writer: " + writer.getClass()); | |
| 196 while (writers.hasNext()) { | |
| 197 System.out.println("next writer: " + writers.next().getClass()); | |
| 198 } | |
| 199 //ImageWriteParam param = writer.getDefaultWriteParam(); | |
| 200 IIOImage iimg = new IIOImage(img, null, null); | |
| 201 ImageOutputStream iostream = new MemoryCacheImageOutputStream(ostream); | |
| 202 writer.setOutput(iostream); | |
| 203 writer.write(iimg); | |
| 204 */ | |
| 205 | |
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206 // render output |
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207 if (ImageIO.write(img, type, ostream)) { |
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208 // writing was OK |
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209 return; |
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210 } else { |
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211 throw new FileOpException("Error writing image: Unknown image format!"); |
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212 } |
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213 } catch (IOException e) { |
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214 // e.printStackTrace(); |
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215 throw new FileOpException("Error writing image."); |
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216 } |
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217 } |
| 1 | 218 |
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219 public void scale(double scale) throws ImageOpException { |
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220 // setup scale |
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221 AffineTransformOp scaleOp = |
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222 new AffineTransformOp( |
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223 AffineTransform.getScaleInstance(scale, scale), |
| 85 | 224 interpol); |
| 140 | 225 BufferedImage scaledImg = scaleOp.createCompatibleDestImage(img, null); |
| 226 scaleOp.filter(img, scaledImg); | |
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227 |
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228 if (scaledImg == null) { |
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229 util.dprintln(2, "ERROR(cropAndScale): error in scale"); |
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230 throw new ImageOpException("Unable to scale"); |
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231 } |
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232 img = scaledImg; |
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233 } |
| 1 | 234 |
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235 public void crop(int x_off, int y_off, int width, int height) |
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236 throws ImageOpException { |
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237 // setup Crop |
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238 BufferedImage croppedImg = img.getSubimage(x_off, y_off, width, height); |
| 1 | 239 |
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240 util.dprintln( |
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241 3, |
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242 "CROP:" + croppedImg.getWidth() + "x" + croppedImg.getHeight()); |
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243 //DEBUG |
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244 // util.dprintln(2, " time "+(System.currentTimeMillis()-startTime)+"ms"); |
| 1 | 245 |
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246 if (croppedImg == null) { |
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247 util.dprintln(2, "ERROR(cropAndScale): error in crop"); |
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248 throw new ImageOpException("Unable to crop"); |
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249 } |
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250 img = croppedImg; |
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251 } |
| 1 | 252 |
| 86 | 253 public void enhance(float mult, float add) throws ImageOpException { |
| 254 /* Only one constant should work regardless of the number of bands | |
| 255 * according to the JDK spec. | |
| 256 * Doesn't work on JDK 1.4 for OSX and Linux (at least). | |
| 85 | 257 */ |
| 86 | 258 /* RescaleOp scaleOp = |
| 259 new RescaleOp( | |
| 260 (float)mult, (float)add, | |
| 261 null); | |
| 262 scaleOp.filter(img, img); | |
| 263 */ | |
| 264 /* The number of constants must match the number of bands in the image. | |
| 265 */ | |
| 266 int ncol = img.getColorModel().getNumColorComponents(); | |
| 267 float[] dm = new float[ncol]; | |
| 268 float[] da = new float[ncol]; | |
| 269 for (int i = 0; i < ncol; i++) { | |
| 270 dm[i] = (float) mult; | |
| 271 da[i] = (float) add; | |
| 85 | 272 } |
| 86 | 273 RescaleOp scaleOp = new RescaleOp(dm, da, null); |
| 85 | 274 scaleOp.filter(img, img); |
| 275 | |
| 276 } | |
| 277 | |
| 86 | 278 public void enhanceRGB(float[] rgbm, float[] rgba) |
| 279 throws ImageOpException { | |
| 280 /* The number of constants must match the number of bands in the image. | |
| 281 * We do only 3 (RGB) bands. | |
| 282 */ | |
| 283 int ncol = img.getColorModel().getNumColorComponents(); | |
| 284 if ((ncol != 3) || (rgbm.length != 3) || (rgba.length != 3)) { | |
| 285 util.dprintln( | |
| 286 2, | |
| 287 "ERROR(enhance): unknown number of color bands or coefficients (" | |
| 288 + ncol | |
| 289 + ")"); | |
| 290 return; | |
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291 } |
| 89 | 292 RescaleOp scaleOp = |
| 293 new RescaleOp(rgbOrdered(rgbm), rgbOrdered(rgba), null); | |
| 86 | 294 scaleOp.filter(img, img); |
| 295 } | |
| 296 | |
| 297 /** Ensures that the array f is in the right order to map the images RGB components. | |
| 298 */ | |
| 299 public float[] rgbOrdered(float[] fa) { | |
| 300 float[] fb = new float[3]; | |
| 301 int t = img.getType(); | |
| 302 if ((t == BufferedImage.TYPE_3BYTE_BGR) | |
| 303 || (t == BufferedImage.TYPE_4BYTE_ABGR) | |
| 304 || (t == BufferedImage.TYPE_4BYTE_ABGR_PRE)) { | |
| 305 // BGR Type (actually it looks like RBG...) | |
| 306 fb[0] = fa[0]; | |
| 307 fb[1] = fa[2]; | |
| 308 fb[2] = fa[1]; | |
| 309 } else { | |
| 310 fb = fa; | |
| 311 } | |
| 312 return fb; | |
| 85 | 313 } |
| 314 | |
| 140 | 315 public void rotate(double angle) throws ImageOpException { |
| 89 | 316 // setup rotation |
| 317 double rangle = Math.toRadians(angle); | |
| 101 | 318 // create offset to make shure the rotated image has no negative coordinates |
| 319 double w = img.getWidth(); | |
| 320 double h = img.getHeight(); | |
| 103 | 321 AffineTransform trafo = new AffineTransform(); |
| 322 // center of rotation | |
| 323 double x = (w / 2); | |
| 324 double y = (h / 2); | |
| 101 | 325 trafo.rotate(rangle, x, y); |
| 103 | 326 // try rotation to see how far we're out of bounds |
| 327 AffineTransformOp rotOp = new AffineTransformOp(trafo, interpol); | |
| 328 Rectangle2D rotbounds = rotOp.getBounds2D(img); | |
| 329 double xoff = rotbounds.getX(); | |
| 330 double yoff = rotbounds.getY(); | |
| 331 // move image back in line | |
| 140 | 332 trafo.preConcatenate( |
| 333 AffineTransform.getTranslateInstance(-xoff, -yoff)); | |
| 101 | 334 // transform image |
| 103 | 335 rotOp = new AffineTransformOp(trafo, interpol); |
| 89 | 336 BufferedImage rotImg = rotOp.filter(img, null); |
| 101 | 337 // calculate new bounding box |
| 103 | 338 //Rectangle2D bounds = rotOp.getBounds2D(img); |
| 86 | 339 |
| 89 | 340 if (rotImg == null) { |
| 341 util.dprintln(2, "ERROR: error in rotate"); | |
| 342 throw new ImageOpException("Unable to rotate"); | |
| 343 } | |
| 103 | 344 img = rotImg; |
| 101 | 345 // crop new image (with self-made rounding) |
| 103 | 346 /* img = |
| 101 | 347 rotImg.getSubimage( |
| 348 (int) (bounds.getX()+0.5), | |
| 349 (int) (bounds.getY()+0.5), | |
| 350 (int) (bounds.getWidth()+0.5), | |
| 351 (int) (bounds.getHeight()+0.5)); | |
| 103 | 352 */ |
| 86 | 353 } |
| 85 | 354 |
| 89 | 355 public void mirror(double angle) throws ImageOpException { |
| 356 // setup mirror | |
| 357 double mx = 1; | |
| 358 double my = 1; | |
| 359 double tx = 0; | |
| 360 double ty = 0; | |
| 361 if (Math.abs(angle - 0) < epsilon) { | |
| 362 // 0 degree | |
| 363 mx = -1; | |
| 364 tx = getWidth(); | |
| 365 } else if (Math.abs(angle - 90) < epsilon) { | |
| 366 // 90 degree | |
| 367 my = -1; | |
| 368 ty = getHeight(); | |
| 369 } else if (Math.abs(angle - 180) < epsilon) { | |
| 370 // 180 degree | |
| 371 mx = -1; | |
| 372 tx = getWidth(); | |
| 373 } else if (Math.abs(angle - 270) < epsilon) { | |
| 374 // 270 degree | |
| 375 my = -1; | |
| 376 ty = getHeight(); | |
| 377 } else if (Math.abs(angle - 360) < epsilon) { | |
| 378 // 360 degree | |
| 379 mx = -1; | |
| 380 tx = getWidth(); | |
| 381 } | |
| 382 AffineTransformOp mirOp = | |
| 383 new AffineTransformOp( | |
| 384 new AffineTransform(mx, 0, 0, my, tx, ty), | |
| 385 interpol); | |
| 386 BufferedImage mirImg = mirOp.filter(img, null); | |
| 387 | |
| 388 if (mirImg == null) { | |
| 389 util.dprintln(2, "ERROR: error in mirror"); | |
| 390 throw new ImageOpException("Unable to mirror"); | |
| 391 } | |
| 392 img = mirImg; | |
|
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|
393 } |
| 86 | 394 |
| 1 | 395 } |