Mercurial > hg > digilib-old
annotate servlet/src/digilib/image/ImageLoaderDocuImage.java @ 376:b91d0fec38a4
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| author | hertzhaft |
|---|---|
| date | Wed, 07 Dec 2005 16:01:22 +0100 |
| parents | 25095f85ba7c |
| children | ee2b943420f5 |
| rev | line source |
|---|---|
| 1 | 1 /* ImageLoaderDocuImage -- Image class implementation using JDK 1.4 ImageLoader |
| 2 | |
| 279 | 3 Digital Image Library servlet components |
| 1 | 4 |
| 279 | 5 Copyright (C) 2002, 2003 Robert Casties (robcast@mail.berlios.de) |
| 1 | 6 |
| 279 | 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 | |
| 1 | 14 |
| 279 | 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 */ | |
| 1 | 19 |
| 20 package digilib.image; | |
| 21 | |
| 85 | 22 import java.awt.Rectangle; |
| 207 | 23 import java.awt.RenderingHints; |
| 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; |
| 352 | 36 import java.util.Locale; |
| 1 | 37 |
| 352 | 38 import javax.imageio.IIOImage; |
| 73 | 39 import javax.imageio.ImageIO; |
| 85 | 40 import javax.imageio.ImageReadParam; |
| 41 import javax.imageio.ImageReader; | |
| 352 | 42 import javax.imageio.ImageWriteParam; |
| 43 import javax.imageio.ImageWriter; | |
| 44 import javax.imageio.plugins.jpeg.JPEGImageWriteParam; | |
| 220 | 45 import javax.imageio.stream.FileImageInputStream; |
| 85 | 46 import javax.imageio.stream.ImageInputStream; |
| 352 | 47 import javax.imageio.stream.ImageOutputStream; |
| 1 | 48 |
| 207 | 49 import digilib.io.FileOpException; |
| 159 | 50 import digilib.io.ImageFile; |
| 1 | 51 |
| 73 | 52 /** Implementation of DocuImage using the ImageLoader API of Java 1.4 and Java2D. */ |
| 1 | 53 public class ImageLoaderDocuImage extends DocuImageImpl { |
| 279 | 54 |
| 86 | 55 /** image object */ |
| 56 protected BufferedImage img; | |
| 279 | 57 |
| 86 | 58 /** interpolation type */ |
| 207 | 59 protected RenderingHints renderHint; |
| 279 | 60 |
| 86 | 61 /** ImageIO image reader */ |
| 62 protected ImageReader reader; | |
| 279 | 63 |
| 86 | 64 /** File that was read */ |
| 65 protected File imgFile; | |
| 85 | 66 |
| 67 /* loadSubimage is supported. */ | |
| 68 public boolean isSubimageSupported() { | |
| 69 return true; | |
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70 } |
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71 |
| 85 | 72 public void setQuality(int qual) { |
| 73 quality = qual; | |
| 207 | 74 renderHint = new RenderingHints(null); |
| 352 | 75 // hint.put(RenderingHints.KEY_ANTIALIASING, |
| 279 | 76 // RenderingHints.VALUE_ANTIALIAS_OFF); |
| 85 | 77 // setup interpolation quality |
| 78 if (qual > 0) { | |
| 181 | 79 logger.debug("quality q1"); |
| 279 | 80 renderHint.put(RenderingHints.KEY_INTERPOLATION, |
| 81 RenderingHints.VALUE_INTERPOLATION_BICUBIC); | |
| 85 | 82 } else { |
| 181 | 83 logger.debug("quality q0"); |
| 279 | 84 renderHint.put(RenderingHints.KEY_INTERPOLATION, |
| 85 RenderingHints.VALUE_INTERPOLATION_NEAREST_NEIGHBOR); | |
| 85 | 86 } |
| 87 } | |
| 86 | 88 |
| 85 | 89 public int getHeight() { |
| 90 int h = 0; | |
| 91 try { | |
| 92 if (img == null) { | |
| 93 h = reader.getHeight(0); | |
| 94 } else { | |
| 95 h = img.getHeight(); | |
| 96 } | |
| 97 } catch (IOException e) { | |
| 181 | 98 logger.debug("error in getHeight", e); |
| 85 | 99 } |
| 100 return h; | |
| 101 } | |
| 102 | |
| 103 public int getWidth() { | |
| 104 int w = 0; | |
| 105 try { | |
| 106 if (img == null) { | |
| 107 w = reader.getWidth(0); | |
| 108 } else { | |
| 109 w = img.getWidth(); | |
| 110 } | |
| 111 } catch (IOException e) { | |
| 181 | 112 logger.debug("error in getHeight", e); |
| 85 | 113 } |
| 114 return w; | |
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115 } |
| 1 | 116 |
| 86 | 117 /* load image file */ |
| 159 | 118 public void loadImage(ImageFile f) throws FileOpException { |
| 279 | 119 logger.debug("loadImage " + f.getFile()); |
| 352 | 120 // System.gc(); |
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121 try { |
| 149 | 122 img = ImageIO.read(f.getFile()); |
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123 if (img == null) { |
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124 throw new FileOpException("Unable to load File!"); |
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125 } |
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126 } catch (IOException e) { |
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127 throw new FileOpException("Error reading image."); |
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128 } |
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129 } |
| 1 | 130 |
| 279 | 131 /** |
| 132 * Get an ImageReader for the image file. | |
| 133 * | |
| 134 * @return | |
| 135 */ | |
| 136 public ImageReader getReader(ImageFile f) throws IOException { | |
| 137 logger.debug("preloadImage " + f.getFile()); | |
| 148 | 138 if (reader != null) { |
| 207 | 139 logger.debug("Reader was not null!"); |
| 148 | 140 // clean up old reader |
| 207 | 141 dispose(); |
| 148 | 142 } |
| 352 | 143 // System.gc(); |
| 149 | 144 RandomAccessFile rf = new RandomAccessFile(f.getFile(), "r"); |
| 220 | 145 ImageInputStream istream = new FileImageInputStream(rf); |
| 352 | 146 // Iterator readers = ImageIO.getImageReaders(istream); |
| 279 | 147 String mt = f.getMimetype(); |
| 148 logger.debug("File type:" + mt); | |
| 149 Iterator readers = ImageIO.getImageReadersByMIMEType(mt); | |
| 150 if (!readers.hasNext()) { | |
| 151 throw new FileOpException("Unable to load File!"); | |
| 152 } | |
| 89 | 153 reader = (ImageReader) readers.next(); |
| 149 | 154 /* are there more readers? */ |
| 207 | 155 logger.debug("ImageIO: this reader: " + reader.getClass()); |
| 140 | 156 while (readers.hasNext()) { |
| 207 | 157 logger.debug("ImageIO: next reader: " + readers.next().getClass()); |
| 140 | 158 } |
| 352 | 159 // */ |
| 89 | 160 reader.setInput(istream); |
| 149 | 161 imgFile = f.getFile(); |
| 279 | 162 return reader; |
| 85 | 163 } |
| 164 | |
| 165 /* Load an image file into the Object. */ | |
| 159 | 166 public void loadSubimage(ImageFile f, Rectangle region, int prescale) |
| 279 | 167 throws FileOpException { |
| 207 | 168 logger.debug("loadSubimage"); |
| 352 | 169 // System.gc(); |
| 85 | 170 try { |
| 149 | 171 if ((reader == null) || (imgFile != f.getFile())) { |
| 279 | 172 getReader(f); |
| 85 | 173 } |
| 174 // set up reader parameters | |
| 175 ImageReadParam readParam = reader.getDefaultReadParam(); | |
| 176 readParam.setSourceRegion(region); | |
| 220 | 177 if (prescale > 1) { |
| 178 readParam.setSourceSubsampling(prescale, prescale, 0, 0); | |
| 179 } | |
| 85 | 180 // read image |
| 207 | 181 logger.debug("loading.."); |
| 85 | 182 img = reader.read(0, readParam); |
| 207 | 183 logger.debug("loaded"); |
| 85 | 184 } catch (IOException e) { |
| 185 throw new FileOpException("Unable to load File!"); | |
| 186 } | |
| 187 if (img == null) { | |
| 188 throw new FileOpException("Unable to load File!"); | |
| 189 } | |
| 190 } | |
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191 |
| 86 | 192 /* write image of type mt to Stream */ |
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193 public void writeImage(String mt, OutputStream ostream) |
| 279 | 194 throws FileOpException { |
| 207 | 195 logger.debug("writeImage"); |
| 353 | 196 // setup output |
| 197 ImageWriter writer = null; | |
| 198 ImageOutputStream imgout = null; | |
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199 try { |
| 353 | 200 imgout = ImageIO.createImageOutputStream(ostream); |
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201 if (mt == "image/jpeg") { |
| 352 | 202 /* |
| 203 * JPEG doesn't do transparency so we have to convert any RGBA | |
| 204 * image to RGB :-( *Java2D BUG* | |
| 205 */ | |
| 206 if (img.getColorModel().hasAlpha()) { | |
| 207 logger.debug("BARF: JPEG with transparency!!"); | |
| 208 int w = img.getWidth(); | |
| 209 int h = img.getHeight(); | |
| 210 // BufferedImage.TYPE_INT_RGB seems to be fastest (JDK1.4.1, | |
| 211 // OSX) | |
| 212 int destType = BufferedImage.TYPE_INT_RGB; | |
| 213 BufferedImage img2 = new BufferedImage(w, h, destType); | |
| 214 img2.createGraphics().drawImage(img, null, 0, 0); | |
| 215 img = img2; | |
| 216 } | |
| 217 writer = (ImageWriter) ImageIO.getImageWritersByFormatName( | |
| 218 "jpeg").next(); | |
| 219 if (writer == null) { | |
| 220 throw new FileOpException("Unable to get JPEG writer"); | |
| 221 } | |
| 222 ImageWriteParam param = writer.getDefaultWriteParam(); | |
| 223 if (quality > 1) { | |
| 224 // change JPEG compression quality | |
| 353 | 225 param.setCompressionMode(ImageWriteParam.MODE_EXPLICIT); |
| 352 | 226 logger.debug("JPEG qual before: " |
| 227 + Float.toString(param.getCompressionQuality())); | |
| 228 param.setCompressionQuality(0.9f); | |
| 229 logger.debug("JPEG qual now: " | |
| 230 + Float.toString(param.getCompressionQuality())); | |
| 231 } | |
| 232 writer.setOutput(imgout); | |
| 233 // render output | |
| 234 logger.debug("writing"); | |
| 235 writer.write(null, new IIOImage(img, null, null), param); | |
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236 } else if (mt == "image/png") { |
| 352 | 237 // render output |
| 238 writer = (ImageWriter) ImageIO.getImageWritersByFormatName( | |
| 239 "png").next(); | |
| 240 if (writer == null) { | |
| 241 throw new FileOpException("Unable to get PNG writer"); | |
| 242 } | |
| 243 writer.setOutput(imgout); | |
| 244 logger.debug("writing"); | |
| 245 writer.write(img); | |
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246 } else { |
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247 // unknown mime type |
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248 throw new FileOpException("Unknown mime type: " + mt); |
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249 } |
| 140 | 250 |
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251 } catch (IOException e) { |
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252 throw new FileOpException("Error writing image."); |
| 353 | 253 } finally { |
| 254 // clean up | |
| 255 if (writer != null) { | |
| 256 writer.dispose(); | |
| 257 } | |
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258 } |
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259 } |
| 1 | 260 |
| 149 | 261 public void scale(double scale, double scaleY) throws ImageOpException { |
| 207 | 262 logger.debug("scale"); |
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263 /* for downscaling in high quality the image is blurred first */ |
| 144 | 264 if ((scale <= 0.5) && (quality > 1)) { |
| 265 int bl = (int) Math.floor(1 / scale); | |
| 266 blur(bl); | |
| 267 } | |
| 207 | 268 /* then scaled */ |
| 279 | 269 AffineTransformOp scaleOp = new AffineTransformOp(AffineTransform |
| 270 .getScaleInstance(scale, scale), renderHint); | |
| 144 | 271 BufferedImage scaledImg = null; |
| 207 | 272 // enforce destination image type (*Java2D BUG*) |
| 220 | 273 int type = img.getType(); |
| 274 // FIXME: which type would be best? | |
| 279 | 275 if ((quality > 0) && (type != 0)) { |
| 207 | 276 logger.debug("creating destination image"); |
| 144 | 277 Rectangle2D dstBounds = scaleOp.getBounds2D(img); |
| 279 | 278 scaledImg = new BufferedImage((int) dstBounds.getWidth(), |
| 279 (int) dstBounds.getHeight(), type); | |
| 144 | 280 } |
| 207 | 281 logger.debug("scaling..."); |
| 144 | 282 scaledImg = scaleOp.filter(img, scaledImg); |
| 279 | 283 logger.debug("destination image type " + scaledImg.getType()); |
| 207 | 284 if (scaledImg == null) { |
| 285 throw new ImageOpException("Unable to scale"); | |
| 286 } | |
| 352 | 287 // DEBUG |
| 279 | 288 logger.debug("SCALE: " + scale + " ->" + scaledImg.getWidth() + "x" |
| 144 | 289 + scaledImg.getHeight()); |
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290 img = scaledImg; |
| 207 | 291 scaledImg = null; |
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292 } |
| 1 | 293 |
| 144 | 294 public void blur(int radius) throws ImageOpException { |
| 352 | 295 // DEBUG |
| 181 | 296 logger.debug("blur: " + radius); |
| 144 | 297 // minimum radius is 2 |
| 298 int klen = Math.max(radius, 2); | |
| 220 | 299 // FIXME: use constant kernels for most common sizes |
| 144 | 300 int ksize = klen * klen; |
| 301 // kernel is constant 1/k | |
| 302 float f = 1f / ksize; | |
| 303 float[] kern = new float[ksize]; | |
| 304 for (int i = 0; i < ksize; i++) { | |
| 305 kern[i] = f; | |
| 306 } | |
| 307 Kernel blur = new Kernel(klen, klen, kern); | |
| 308 // blur with convolve operation | |
| 279 | 309 ConvolveOp blurOp = new ConvolveOp(blur, ConvolveOp.EDGE_NO_OP, |
| 310 renderHint); | |
| 145 | 311 // blur needs explicit destination image type for color *Java2D BUG* |
| 312 BufferedImage blurredImg = null; | |
| 313 if (img.getType() == BufferedImage.TYPE_3BYTE_BGR) { | |
| 279 | 314 blurredImg = new BufferedImage(img.getWidth(), img.getHeight(), img |
| 315 .getType()); | |
| 145 | 316 } |
| 317 blurredImg = blurOp.filter(img, blurredImg); | |
| 144 | 318 if (blurredImg == null) { |
| 319 throw new ImageOpException("Unable to scale"); | |
| 320 } | |
| 321 img = blurredImg; | |
| 322 } | |
| 323 | |
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324 public void crop(int x_off, int y_off, int width, int height) |
| 279 | 325 throws ImageOpException { |
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326 // setup Crop |
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327 BufferedImage croppedImg = img.getSubimage(x_off, y_off, width, height); |
| 279 | 328 logger.debug("CROP:" + croppedImg.getWidth() + "x" |
| 329 + croppedImg.getHeight()); | |
| 352 | 330 // DEBUG |
| 331 // util.dprintln(2, " time | |
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332 // "+(System.currentTimeMillis()-startTime)+"ms"); |
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333 if (croppedImg == null) { |
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334 throw new ImageOpException("Unable to crop"); |
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335 } |
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336 img = croppedImg; |
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337 } |
| 1 | 338 |
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339 public void enhance(float mult, float add) throws ImageOpException { |
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340 /* |
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341 * Only one constant should work regardless of the number of bands |
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342 * according to the JDK spec. Doesn't work on JDK 1.4 for OSX and Linux |
| 279 | 343 * (at least). RescaleOp scaleOp = new RescaleOp( (float)mult, |
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344 * (float)add, null); scaleOp.filter(img, img); |
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345 */ |
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346 |
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347 /* The number of constants must match the number of bands in the image. */ |
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348 int ncol = img.getColorModel().getNumComponents(); |
| 86 | 349 float[] dm = new float[ncol]; |
| 350 float[] da = new float[ncol]; | |
| 351 for (int i = 0; i < ncol; i++) { | |
| 352 dm[i] = (float) mult; | |
| 353 da[i] = (float) add; | |
| 85 | 354 } |
| 86 | 355 RescaleOp scaleOp = new RescaleOp(dm, da, null); |
| 85 | 356 scaleOp.filter(img, img); |
| 357 } | |
| 358 | |
| 279 | 359 public void enhanceRGB(float[] rgbm, float[] rgba) throws ImageOpException { |
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360 |
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361 /* |
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362 * The number of constants must match the number of bands in the image. |
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363 * We do only 3 (RGB) bands. |
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364 */ |
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365 |
| 86 | 366 int ncol = img.getColorModel().getNumColorComponents(); |
| 367 if ((ncol != 3) || (rgbm.length != 3) || (rgba.length != 3)) { | |
| 279 | 368 logger |
| 369 .debug("ERROR(enhance): unknown number of color bands or coefficients (" | |
| 370 + ncol + ")"); | |
| 86 | 371 return; |
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372 } |
| 279 | 373 RescaleOp scaleOp = new RescaleOp(rgbOrdered(rgbm), rgbOrdered(rgba), |
| 374 null); | |
| 86 | 375 scaleOp.filter(img, img); |
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376 } |
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377 |
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378 /** |
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379 * Ensures that the array f is in the right order to map the images RGB |
| 279 | 380 * components. (not shure what happens |
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381 */ |
| 86 | 382 public float[] rgbOrdered(float[] fa) { |
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383 /* |
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384 * TODO: this is UGLY, UGLY!! |
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385 */ |
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386 float[] fb; |
| 86 | 387 int t = img.getType(); |
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388 if (img.getColorModel().hasAlpha()) { |
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389 fb = new float[4]; |
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390 if ((t == BufferedImage.TYPE_INT_ARGB) |
| 279 | 391 || (t == BufferedImage.TYPE_INT_ARGB_PRE)) { |
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392 // RGB Type |
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393 fb[0] = fa[0]; |
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394 fb[1] = fa[1]; |
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395 fb[2] = fa[2]; |
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396 fb[3] = 1f; |
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397 } else { |
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398 // this isn't tested :-( |
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399 fb[0] = 1f; |
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400 fb[1] = fa[0]; |
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401 fb[2] = fa[1]; |
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402 fb[3] = fa[2]; |
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403 } |
| 86 | 404 } else { |
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405 fb = new float[3]; |
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406 if (t == BufferedImage.TYPE_3BYTE_BGR) { |
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407 // BGR Type (actually it looks like RBG...) |
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408 fb[0] = fa[0]; |
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409 fb[1] = fa[2]; |
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410 fb[2] = fa[1]; |
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411 } else { |
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412 fb[0] = fa[0]; |
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413 fb[1] = fa[1]; |
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414 fb[2] = fa[2]; |
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415 } |
| 86 | 416 } |
| 417 return fb; | |
| 85 | 418 } |
| 419 | |
| 140 | 420 public void rotate(double angle) throws ImageOpException { |
| 89 | 421 // setup rotation |
| 422 double rangle = Math.toRadians(angle); | |
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423 // create offset to make shure the rotated image has no negative |
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424 // coordinates |
| 101 | 425 double w = img.getWidth(); |
| 426 double h = img.getHeight(); | |
| 103 | 427 AffineTransform trafo = new AffineTransform(); |
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428 // center of rotation |
| 103 | 429 double x = (w / 2); |
| 430 double y = (h / 2); | |
| 101 | 431 trafo.rotate(rangle, x, y); |
| 103 | 432 // try rotation to see how far we're out of bounds |
| 207 | 433 AffineTransformOp rotOp = new AffineTransformOp(trafo, renderHint); |
| 103 | 434 Rectangle2D rotbounds = rotOp.getBounds2D(img); |
| 435 double xoff = rotbounds.getX(); | |
| 436 double yoff = rotbounds.getY(); | |
| 437 // move image back in line | |
| 279 | 438 trafo |
| 439 .preConcatenate(AffineTransform.getTranslateInstance(-xoff, | |
| 440 -yoff)); | |
| 101 | 441 // transform image |
| 207 | 442 rotOp = new AffineTransformOp(trafo, renderHint); |
| 89 | 443 BufferedImage rotImg = rotOp.filter(img, null); |
| 101 | 444 // calculate new bounding box |
| 352 | 445 // Rectangle2D bounds = rotOp.getBounds2D(img); |
| 89 | 446 if (rotImg == null) { |
| 447 throw new ImageOpException("Unable to rotate"); | |
| 448 } | |
| 103 | 449 img = rotImg; |
| 101 | 450 // crop new image (with self-made rounding) |
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451 /* |
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452 * img = rotImg.getSubimage( (int) (bounds.getX()+0.5), (int) |
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453 * (bounds.getY()+0.5), (int) (bounds.getWidth()+0.5), (int) |
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454 * (bounds.getHeight()+0.5)); |
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455 */ |
| 86 | 456 } |
| 85 | 457 |
| 89 | 458 public void mirror(double angle) throws ImageOpException { |
| 459 // setup mirror | |
| 460 double mx = 1; | |
| 461 double my = 1; | |
| 462 double tx = 0; | |
| 463 double ty = 0; | |
| 144 | 464 if (Math.abs(angle - 0) < epsilon) { // 0 degree |
| 89 | 465 mx = -1; |
| 466 tx = getWidth(); | |
| 144 | 467 } else if (Math.abs(angle - 90) < epsilon) { // 90 degree |
| 89 | 468 my = -1; |
| 469 ty = getHeight(); | |
| 144 | 470 } else if (Math.abs(angle - 180) < epsilon) { // 180 degree |
| 89 | 471 mx = -1; |
| 472 tx = getWidth(); | |
| 144 | 473 } else if (Math.abs(angle - 270) < epsilon) { // 270 degree |
| 89 | 474 my = -1; |
| 475 ty = getHeight(); | |
| 144 | 476 } else if (Math.abs(angle - 360) < epsilon) { // 360 degree |
| 89 | 477 mx = -1; |
| 478 tx = getWidth(); | |
| 479 } | |
| 279 | 480 AffineTransformOp mirOp = new AffineTransformOp(new AffineTransform(mx, |
| 481 0, 0, my, tx, ty), renderHint); | |
| 89 | 482 BufferedImage mirImg = mirOp.filter(img, null); |
| 483 if (mirImg == null) { | |
| 484 throw new ImageOpException("Unable to mirror"); | |
| 485 } | |
| 486 img = mirImg; | |
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487 } |
| 86 | 488 |
| 279 | 489 /* |
| 490 * (non-Javadoc) | |
| 491 * | |
| 492 * @see java.lang.Object#finalize() | |
| 493 */ | |
| 148 | 494 protected void finalize() throws Throwable { |
| 207 | 495 dispose(); |
| 496 super.finalize(); | |
| 497 } | |
| 498 | |
| 499 public void dispose() { | |
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500 // we must dispose the ImageReader because it keeps the filehandle |
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501 // open! |
| 256 | 502 if (reader != null) { |
| 503 reader.dispose(); | |
| 504 reader = null; | |
| 505 } | |
| 148 | 506 img = null; |
| 507 } | |
| 508 | |
| 1 | 509 } |