Mercurial > hg > digilib-old
annotate servlet/src/digilib/image/ImageLoaderDocuImage.java @ 144:d87a7e2515af
Sevlet version 1.12b5
- improved scaling also for ImageLoaderDocuImage
| author | robcast |
|---|---|
| date | Tue, 19 Aug 2003 22:31:48 +0200 |
| parents | c878ea574c29 |
| children | d76006c12e89 |
| 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; | |
| 144 | 28 import java.awt.image.ConvolveOp; |
| 29 import java.awt.image.Kernel; | |
| 85 | 30 import java.awt.image.RescaleOp; |
| 73 | 31 import java.io.File; |
| 32 import java.io.IOException; | |
|
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33 import java.io.OutputStream; |
| 89 | 34 import java.io.RandomAccessFile; |
| 85 | 35 import java.util.Iterator; |
| 1 | 36 |
| 73 | 37 import javax.imageio.ImageIO; |
| 85 | 38 import javax.imageio.ImageReadParam; |
| 39 import javax.imageio.ImageReader; | |
| 40 import javax.imageio.stream.ImageInputStream; | |
| 1 | 41 |
| 73 | 42 import digilib.io.FileOpException; |
| 1 | 43 |
| 73 | 44 /** Implementation of DocuImage using the ImageLoader API of Java 1.4 and Java2D. */ |
| 1 | 45 public class ImageLoaderDocuImage extends DocuImageImpl { |
| 46 | |
| 86 | 47 /** image object */ |
| 48 protected BufferedImage img; | |
| 49 /** interpolation type */ | |
| 50 protected int interpol; | |
| 51 /** ImageIO image reader */ | |
| 52 protected ImageReader reader; | |
| 53 /** File that was read */ | |
| 54 protected File imgFile; | |
| 85 | 55 |
| 56 /* loadSubimage is supported. */ | |
| 57 public boolean isSubimageSupported() { | |
| 58 return true; | |
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59 } |
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60 |
| 85 | 61 public void setQuality(int qual) { |
| 62 quality = qual; | |
| 63 // setup interpolation quality | |
| 64 if (qual > 0) { | |
| 65 util.dprintln(4, "quality q1"); | |
| 66 interpol = AffineTransformOp.TYPE_BILINEAR; | |
| 67 } else { | |
| 68 util.dprintln(4, "quality q0"); | |
| 69 interpol = AffineTransformOp.TYPE_NEAREST_NEIGHBOR; | |
| 70 } | |
| 71 } | |
| 86 | 72 |
| 85 | 73 public int getHeight() { |
| 74 int h = 0; | |
| 75 try { | |
| 76 if (img == null) { | |
| 77 h = reader.getHeight(0); | |
| 78 } else { | |
| 79 h = img.getHeight(); | |
| 80 } | |
| 81 } catch (IOException e) { | |
| 82 e.printStackTrace(); | |
| 83 } | |
| 84 return h; | |
| 85 } | |
| 86 | |
| 87 public int getWidth() { | |
| 88 int w = 0; | |
| 89 try { | |
| 90 if (img == null) { | |
| 91 w = reader.getWidth(0); | |
| 92 } else { | |
| 93 w = img.getWidth(); | |
| 94 } | |
| 95 } catch (IOException e) { | |
| 96 e.printStackTrace(); | |
| 97 } | |
| 98 return w; | |
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99 } |
| 1 | 100 |
| 86 | 101 /* load image file */ |
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102 public void loadImage(File f) throws FileOpException { |
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103 util.dprintln(10, "loadImage!"); |
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104 System.gc(); |
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105 try { |
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106 img = ImageIO.read(f); |
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107 if (img == null) { |
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108 util.dprintln(3, "ERROR(loadImage): unable to load file"); |
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109 throw new FileOpException("Unable to load File!"); |
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110 } |
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111 } catch (IOException e) { |
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112 throw new FileOpException("Error reading image."); |
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113 } |
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114 } |
| 1 | 115 |
| 86 | 116 /** Get an ImageReader for the image file. |
| 117 * | |
| 118 */ | |
| 89 | 119 public void preloadImage(File f) throws IOException { |
| 85 | 120 System.gc(); |
| 89 | 121 RandomAccessFile rf = new RandomAccessFile(f, "r"); |
| 122 ImageInputStream istream = ImageIO.createImageInputStream(rf); | |
| 123 Iterator readers = ImageIO.getImageReaders(istream); | |
| 124 reader = (ImageReader) readers.next(); | |
| 140 | 125 /* are there more readers? |
| 126 System.out.println("this reader: " + reader.getClass()); | |
| 127 while (readers.hasNext()) { | |
| 128 System.out.println("next reader: " + readers.next().getClass()); | |
| 129 } | |
| 130 */ | |
| 89 | 131 reader.setInput(istream); |
| 85 | 132 if (reader == null) { |
| 133 util.dprintln(3, "ERROR(loadImage): unable to load file"); | |
| 134 throw new FileOpException("Unable to load File!"); | |
| 135 } | |
| 86 | 136 imgFile = f; |
| 85 | 137 } |
| 138 | |
| 139 /* Load an image file into the Object. */ | |
| 140 public void loadSubimage(File f, Rectangle region, int prescale) | |
| 141 throws FileOpException { | |
| 142 System.gc(); | |
| 143 try { | |
| 86 | 144 if ((reader == null) || (imgFile != f)) { |
| 85 | 145 preloadImage(f); |
| 146 } | |
| 147 // set up reader parameters | |
| 148 ImageReadParam readParam = reader.getDefaultReadParam(); | |
| 149 readParam.setSourceRegion(region); | |
| 150 readParam.setSourceSubsampling(prescale, prescale, 0, 0); | |
| 151 // read image | |
| 152 img = reader.read(0, readParam); | |
| 153 } catch (IOException e) { | |
| 154 util.dprintln(3, "ERROR(loadImage): unable to load file"); | |
| 155 throw new FileOpException("Unable to load File!"); | |
| 156 } | |
| 157 if (img == null) { | |
| 158 util.dprintln(3, "ERROR(loadImage): unable to load file"); | |
| 159 throw new FileOpException("Unable to load File!"); | |
| 160 } | |
| 161 } | |
| 162 | |
| 86 | 163 /* write image of type mt to Stream */ |
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164 public void writeImage(String mt, OutputStream ostream) |
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165 throws FileOpException { |
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166 util.dprintln(10, "writeImage!"); |
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167 try { |
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168 // setup output |
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169 String type = "png"; |
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170 if (mt == "image/jpeg") { |
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171 type = "jpeg"; |
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172 } else if (mt == "image/png") { |
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173 type = "png"; |
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174 } else { |
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175 // unknown mime type |
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176 util.dprintln(2, "ERROR(writeImage): Unknown mime type " + mt); |
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177 throw new FileOpException("Unknown mime type: " + mt); |
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178 } |
| 140 | 179 |
| 180 /* JPEG doesn't do transparency so we have to convert any RGBA image | |
| 144 | 181 * to RGB :-( *Java2D BUG* |
| 140 | 182 */ |
| 183 if ((type == "jpeg") && (img.getColorModel().hasAlpha())) { | |
| 184 util.dprintln(2, "BARF: JPEG with transparency!!"); | |
| 185 int w = img.getWidth(); | |
| 186 int h = img.getHeight(); | |
| 187 // BufferedImage.TYPE_INT_RGB seems to be fastest (JDK1.4.1, OSX) | |
| 144 | 188 int destType = BufferedImage.TYPE_INT_RGB; |
| 189 BufferedImage img2 = new BufferedImage(w, h, destType); | |
| 140 | 190 img2.createGraphics().drawImage(img, null, 0, 0); |
| 191 img = img2; | |
| 192 } | |
| 193 | |
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194 // render output |
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195 if (ImageIO.write(img, type, ostream)) { |
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196 // writing was OK |
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197 return; |
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198 } else { |
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199 throw new FileOpException("Error writing image: Unknown image format!"); |
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200 } |
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201 } catch (IOException e) { |
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202 // e.printStackTrace(); |
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203 throw new FileOpException("Error writing image."); |
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204 } |
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205 } |
| 1 | 206 |
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207 public void scale(double scale) throws ImageOpException { |
| 144 | 208 /* |
| 209 * for downscaling in high quality the image is blurred first | |
| 210 */ | |
| 211 if ((scale <= 0.5) && (quality > 1)) { | |
| 212 int bl = (int) Math.floor(1 / scale); | |
| 213 blur(bl); | |
| 214 } | |
| 215 /* | |
| 216 * and scaled | |
| 217 */ | |
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218 AffineTransformOp scaleOp = |
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219 new AffineTransformOp( |
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220 AffineTransform.getScaleInstance(scale, scale), |
| 85 | 221 interpol); |
| 144 | 222 BufferedImage scaledImg = null; |
| 223 // enforce grey destination image for greyscale *Java2D BUG* | |
| 224 if ((quality > 0) | |
| 225 && ((img.getType() == BufferedImage.TYPE_BYTE_GRAY) | |
| 226 || (img.getType() == BufferedImage.TYPE_BYTE_BINARY) | |
| 227 || (img.getType() == BufferedImage.TYPE_USHORT_GRAY))) { | |
| 228 Rectangle2D dstBounds = scaleOp.getBounds2D(img); | |
| 229 scaledImg = | |
| 230 new BufferedImage( | |
| 231 (int) dstBounds.getWidth(), | |
| 232 (int) dstBounds.getHeight(), | |
| 233 img.getType()); | |
| 234 } | |
| 235 scaledImg = scaleOp.filter(img, scaledImg); | |
| 236 //DEBUG | |
| 237 util.dprintln( | |
| 238 3, | |
| 239 "SCALE: " | |
| 240 + scale | |
| 241 + " ->" | |
| 242 + scaledImg.getWidth() | |
| 243 + "x" | |
| 244 + scaledImg.getHeight()); | |
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245 if (scaledImg == null) { |
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246 util.dprintln(2, "ERROR(cropAndScale): error in scale"); |
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247 throw new ImageOpException("Unable to scale"); |
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248 } |
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249 img = scaledImg; |
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250 } |
| 1 | 251 |
| 144 | 252 public void blur(int radius) throws ImageOpException { |
| 253 BufferedImage blurredImg; | |
| 254 //DEBUG | |
| 255 util.dprintln(4, "blur: " + radius); | |
| 256 // minimum radius is 2 | |
| 257 int klen = Math.max(radius, 2); | |
| 258 int ksize = klen * klen; | |
| 259 // kernel is constant 1/k | |
| 260 float f = 1f / ksize; | |
| 261 float[] kern = new float[ksize]; | |
| 262 for (int i = 0; i < ksize; i++) { | |
| 263 kern[i] = f; | |
| 264 } | |
| 265 Kernel blur = new Kernel(klen, klen, kern); | |
| 266 // blur with convolve operation | |
| 267 ConvolveOp blurOp = new ConvolveOp(blur, ConvolveOp.EDGE_NO_OP, null); | |
| 268 blurredImg = blurOp.filter(img, null); | |
| 269 if (blurredImg == null) { | |
| 270 util.dprintln(2, "ERROR(cropAndScale): error in scale"); | |
| 271 throw new ImageOpException("Unable to scale"); | |
| 272 } | |
| 273 img = blurredImg; | |
| 274 } | |
| 275 | |
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276 public void crop(int x_off, int y_off, int width, int height) |
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277 throws ImageOpException { |
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278 // setup Crop |
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279 BufferedImage croppedImg = img.getSubimage(x_off, y_off, width, height); |
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280 util.dprintln( |
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281 3, |
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282 "CROP:" + croppedImg.getWidth() + "x" + croppedImg.getHeight()); |
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283 //DEBUG |
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284 // util.dprintln(2, " time "+(System.currentTimeMillis()-startTime)+"ms"); |
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285 if (croppedImg == null) { |
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286 util.dprintln(2, "ERROR(cropAndScale): error in crop"); |
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287 throw new ImageOpException("Unable to crop"); |
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288 } |
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289 img = croppedImg; |
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290 } |
| 1 | 291 |
| 144 | 292 public void enhance(float mult, float add) |
| 293 throws ImageOpException { /* Only one constant should work regardless of the number of bands | |
| 294 * according to the JDK spec. | |
| 295 * Doesn't work on JDK 1.4 for OSX and Linux (at least). | |
| 296 */ /* RescaleOp scaleOp = | |
| 297 new RescaleOp( | |
| 298 (float)mult, (float)add, | |
| 299 null); | |
| 300 scaleOp.filter(img, img); | |
| 301 */ /* The number of constants must match the number of bands in the image. | |
| 302 */ | |
| 86 | 303 int ncol = img.getColorModel().getNumColorComponents(); |
| 304 float[] dm = new float[ncol]; | |
| 305 float[] da = new float[ncol]; | |
| 306 for (int i = 0; i < ncol; i++) { | |
| 307 dm[i] = (float) mult; | |
| 308 da[i] = (float) add; | |
| 85 | 309 } |
| 86 | 310 RescaleOp scaleOp = new RescaleOp(dm, da, null); |
| 85 | 311 scaleOp.filter(img, img); |
| 312 } | |
| 313 | |
| 86 | 314 public void enhanceRGB(float[] rgbm, float[] rgba) |
| 144 | 315 throws ImageOpException { /* The number of constants must match the number of bands in the image. |
| 316 * We do only 3 (RGB) bands. | |
| 317 */ | |
| 86 | 318 int ncol = img.getColorModel().getNumColorComponents(); |
| 319 if ((ncol != 3) || (rgbm.length != 3) || (rgba.length != 3)) { | |
| 320 util.dprintln( | |
| 321 2, | |
| 322 "ERROR(enhance): unknown number of color bands or coefficients (" | |
| 323 + ncol | |
| 324 + ")"); | |
| 325 return; | |
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326 } |
| 89 | 327 RescaleOp scaleOp = |
| 328 new RescaleOp(rgbOrdered(rgbm), rgbOrdered(rgba), null); | |
| 86 | 329 scaleOp.filter(img, img); |
| 144 | 330 } /** Ensures that the array f is in the right order to map the images RGB components. |
| 331 */ | |
| 86 | 332 public float[] rgbOrdered(float[] fa) { |
| 333 float[] fb = new float[3]; | |
| 334 int t = img.getType(); | |
| 335 if ((t == BufferedImage.TYPE_3BYTE_BGR) | |
| 336 || (t == BufferedImage.TYPE_4BYTE_ABGR) | |
| 337 || (t == BufferedImage.TYPE_4BYTE_ABGR_PRE)) { | |
| 338 // BGR Type (actually it looks like RBG...) | |
| 339 fb[0] = fa[0]; | |
| 340 fb[1] = fa[2]; | |
| 341 fb[2] = fa[1]; | |
| 342 } else { | |
| 343 fb = fa; | |
| 344 } | |
| 345 return fb; | |
| 85 | 346 } |
| 347 | |
| 140 | 348 public void rotate(double angle) throws ImageOpException { |
| 89 | 349 // setup rotation |
| 350 double rangle = Math.toRadians(angle); | |
| 101 | 351 // create offset to make shure the rotated image has no negative coordinates |
| 352 double w = img.getWidth(); | |
| 353 double h = img.getHeight(); | |
| 103 | 354 AffineTransform trafo = new AffineTransform(); |
| 355 // center of rotation | |
| 356 double x = (w / 2); | |
| 357 double y = (h / 2); | |
| 101 | 358 trafo.rotate(rangle, x, y); |
| 103 | 359 // try rotation to see how far we're out of bounds |
| 360 AffineTransformOp rotOp = new AffineTransformOp(trafo, interpol); | |
| 361 Rectangle2D rotbounds = rotOp.getBounds2D(img); | |
| 362 double xoff = rotbounds.getX(); | |
| 363 double yoff = rotbounds.getY(); | |
| 364 // move image back in line | |
| 140 | 365 trafo.preConcatenate( |
| 366 AffineTransform.getTranslateInstance(-xoff, -yoff)); | |
| 101 | 367 // transform image |
| 103 | 368 rotOp = new AffineTransformOp(trafo, interpol); |
| 89 | 369 BufferedImage rotImg = rotOp.filter(img, null); |
| 101 | 370 // calculate new bounding box |
| 103 | 371 //Rectangle2D bounds = rotOp.getBounds2D(img); |
| 89 | 372 if (rotImg == null) { |
| 373 util.dprintln(2, "ERROR: error in rotate"); | |
| 374 throw new ImageOpException("Unable to rotate"); | |
| 375 } | |
| 103 | 376 img = rotImg; |
| 101 | 377 // crop new image (with self-made rounding) |
| 103 | 378 /* img = |
| 101 | 379 rotImg.getSubimage( |
| 380 (int) (bounds.getX()+0.5), | |
| 381 (int) (bounds.getY()+0.5), | |
| 382 (int) (bounds.getWidth()+0.5), | |
| 383 (int) (bounds.getHeight()+0.5)); | |
| 103 | 384 */ |
| 86 | 385 } |
| 85 | 386 |
| 89 | 387 public void mirror(double angle) throws ImageOpException { |
| 388 // setup mirror | |
| 389 double mx = 1; | |
| 390 double my = 1; | |
| 391 double tx = 0; | |
| 392 double ty = 0; | |
| 144 | 393 if (Math.abs(angle - 0) < epsilon) { // 0 degree |
| 89 | 394 mx = -1; |
| 395 tx = getWidth(); | |
| 144 | 396 } else if (Math.abs(angle - 90) < epsilon) { // 90 degree |
| 89 | 397 my = -1; |
| 398 ty = getHeight(); | |
| 144 | 399 } else if (Math.abs(angle - 180) < epsilon) { // 180 degree |
| 89 | 400 mx = -1; |
| 401 tx = getWidth(); | |
| 144 | 402 } else if (Math.abs(angle - 270) < epsilon) { // 270 degree |
| 89 | 403 my = -1; |
| 404 ty = getHeight(); | |
| 144 | 405 } else if (Math.abs(angle - 360) < epsilon) { // 360 degree |
| 89 | 406 mx = -1; |
| 407 tx = getWidth(); | |
| 408 } | |
| 409 AffineTransformOp mirOp = | |
| 410 new AffineTransformOp( | |
| 411 new AffineTransform(mx, 0, 0, my, tx, ty), | |
| 412 interpol); | |
| 413 BufferedImage mirImg = mirOp.filter(img, null); | |
| 414 if (mirImg == null) { | |
| 415 util.dprintln(2, "ERROR: error in mirror"); | |
| 416 throw new ImageOpException("Unable to mirror"); | |
| 417 } | |
| 418 img = mirImg; | |
|
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419 } |
| 86 | 420 |
| 1 | 421 } |