Mercurial > hg > digilib-old
annotate servlet/src/digilib/image/ImageLoaderDocuImage.java @ 244:a945d4d5f8cd
new digimage with red triangles for moving the zoomed area
(can be switched off with "clop=noarrows")
| author | robcast |
|---|---|
| date | Wed, 04 Aug 2004 20:35:35 +0200 |
| parents | c4ee5f0c3a77 |
| children | 7ff9b9b0c16a |
| 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 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; |
| 1 | 36 |
| 73 | 37 import javax.imageio.ImageIO; |
| 85 | 38 import javax.imageio.ImageReadParam; |
| 39 import javax.imageio.ImageReader; | |
| 220 | 40 import javax.imageio.stream.FileImageInputStream; |
| 85 | 41 import javax.imageio.stream.ImageInputStream; |
| 1 | 42 |
| 207 | 43 import digilib.io.FileOpException; |
| 159 | 44 import digilib.io.ImageFile; |
| 1 | 45 |
| 73 | 46 /** Implementation of DocuImage using the ImageLoader API of Java 1.4 and Java2D. */ |
| 1 | 47 public class ImageLoaderDocuImage extends DocuImageImpl { |
| 181 | 48 |
| 86 | 49 /** image object */ |
| 50 protected BufferedImage img; | |
| 51 /** interpolation type */ | |
| 207 | 52 protected RenderingHints renderHint; |
| 86 | 53 /** ImageIO image reader */ |
| 54 protected ImageReader reader; | |
| 55 /** File that was read */ | |
| 56 protected File imgFile; | |
| 85 | 57 |
| 58 /* loadSubimage is supported. */ | |
| 59 public boolean isSubimageSupported() { | |
| 60 return true; | |
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61 } |
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62 |
| 85 | 63 public void setQuality(int qual) { |
| 64 quality = qual; | |
| 207 | 65 renderHint = new RenderingHints(null); |
| 66 //hint.put(RenderingHints.KEY_ANTIALIASING, RenderingHints.VALUE_ANTIALIAS_OFF); | |
| 85 | 67 // setup interpolation quality |
| 68 if (qual > 0) { | |
| 181 | 69 logger.debug("quality q1"); |
| 207 | 70 renderHint.put(RenderingHints.KEY_INTERPOLATION, RenderingHints.VALUE_INTERPOLATION_BICUBIC); |
| 85 | 71 } else { |
| 181 | 72 logger.debug("quality q0"); |
| 207 | 73 renderHint.put(RenderingHints.KEY_INTERPOLATION, RenderingHints.VALUE_INTERPOLATION_NEAREST_NEIGHBOR); |
| 85 | 74 } |
| 75 } | |
| 86 | 76 |
| 85 | 77 public int getHeight() { |
| 78 int h = 0; | |
| 79 try { | |
| 80 if (img == null) { | |
| 81 h = reader.getHeight(0); | |
| 82 } else { | |
| 83 h = img.getHeight(); | |
| 84 } | |
| 85 } catch (IOException e) { | |
| 181 | 86 logger.debug("error in getHeight", e); |
| 85 | 87 } |
| 88 return h; | |
| 89 } | |
| 90 | |
| 91 public int getWidth() { | |
| 92 int w = 0; | |
| 93 try { | |
| 94 if (img == null) { | |
| 95 w = reader.getWidth(0); | |
| 96 } else { | |
| 97 w = img.getWidth(); | |
| 98 } | |
| 99 } catch (IOException e) { | |
| 181 | 100 logger.debug("error in getHeight", e); |
| 85 | 101 } |
| 102 return w; | |
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103 } |
| 1 | 104 |
| 86 | 105 /* load image file */ |
| 159 | 106 public void loadImage(ImageFile f) throws FileOpException { |
| 207 | 107 logger.debug("loadImage "+f.getFile()); |
| 159 | 108 //System.gc(); |
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109 try { |
| 149 | 110 img = ImageIO.read(f.getFile()); |
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111 if (img == null) { |
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112 throw new FileOpException("Unable to load File!"); |
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113 } |
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114 } catch (IOException e) { |
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115 throw new FileOpException("Error reading image."); |
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116 } |
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117 } |
| 1 | 118 |
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119 /** Get an ImageReader for the image file. */ |
| 159 | 120 public void preloadImage(ImageFile f) throws IOException { |
| 207 | 121 logger.debug("preloadImage "+f.getFile()); |
| 148 | 122 if (reader != null) { |
| 207 | 123 logger.debug("Reader was not null!"); |
| 148 | 124 // clean up old reader |
| 207 | 125 dispose(); |
| 148 | 126 } |
| 159 | 127 //System.gc(); |
| 149 | 128 RandomAccessFile rf = new RandomAccessFile(f.getFile(), "r"); |
| 220 | 129 ImageInputStream istream = new FileImageInputStream(rf); |
| 130 Iterator readers = ImageIO.getImageReaders(istream); | |
| 149 | 131 //String ext = f.getName().substring(f.getName().lastIndexOf('.')+1); |
| 132 //Iterator readers = ImageIO.getImageReadersBySuffix(ext); | |
| 220 | 133 //Iterator readers = ImageIO.getImageReadersByMIMEType(f.getMimetype()); |
| 89 | 134 reader = (ImageReader) readers.next(); |
| 149 | 135 /* are there more readers? */ |
| 207 | 136 logger.debug("ImageIO: this reader: " + reader.getClass()); |
| 140 | 137 while (readers.hasNext()) { |
| 207 | 138 logger.debug("ImageIO: next reader: " + readers.next().getClass()); |
| 140 | 139 } |
| 149 | 140 //*/ |
| 89 | 141 reader.setInput(istream); |
| 85 | 142 if (reader == null) { |
| 143 throw new FileOpException("Unable to load File!"); | |
| 144 } | |
| 149 | 145 imgFile = f.getFile(); |
| 85 | 146 } |
| 147 | |
| 148 /* Load an image file into the Object. */ | |
| 159 | 149 public void loadSubimage(ImageFile f, Rectangle region, int prescale) |
| 85 | 150 throws FileOpException { |
| 207 | 151 logger.debug("loadSubimage"); |
| 159 | 152 //System.gc(); |
| 85 | 153 try { |
| 149 | 154 if ((reader == null) || (imgFile != f.getFile())) { |
| 85 | 155 preloadImage(f); |
| 156 } | |
| 157 // set up reader parameters | |
| 158 ImageReadParam readParam = reader.getDefaultReadParam(); | |
| 159 readParam.setSourceRegion(region); | |
| 220 | 160 if (prescale > 1) { |
| 161 readParam.setSourceSubsampling(prescale, prescale, 0, 0); | |
| 162 } | |
| 85 | 163 // read image |
| 207 | 164 logger.debug("loading.."); |
| 85 | 165 img = reader.read(0, readParam); |
| 207 | 166 logger.debug("loaded"); |
| 85 | 167 } catch (IOException e) { |
| 168 throw new FileOpException("Unable to load File!"); | |
| 169 } | |
| 170 if (img == null) { | |
| 171 throw new FileOpException("Unable to load File!"); | |
| 172 } | |
| 173 } | |
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174 |
| 86 | 175 /* write image of type mt to Stream */ |
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176 public void writeImage(String mt, OutputStream ostream) |
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177 throws FileOpException { |
| 207 | 178 logger.debug("writeImage"); |
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179 try { |
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180 // setup output |
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181 String type = "png"; |
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182 if (mt == "image/jpeg") { |
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183 type = "jpeg"; |
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184 } else if (mt == "image/png") { |
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185 type = "png"; |
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186 } else { |
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187 // unknown mime type |
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188 throw new FileOpException("Unknown mime type: " + mt); |
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189 } |
| 140 | 190 |
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191 /* |
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192 * JPEG doesn't do transparency so we have to convert any RGBA |
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193 * image to RGB :-( *Java2D BUG* |
| 140 | 194 */ |
| 195 if ((type == "jpeg") && (img.getColorModel().hasAlpha())) { | |
| 181 | 196 logger.debug("BARF: JPEG with transparency!!"); |
| 140 | 197 int w = img.getWidth(); |
| 198 int h = img.getHeight(); | |
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199 // BufferedImage.TYPE_INT_RGB seems to be fastest (JDK1.4.1, |
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200 // OSX) |
| 144 | 201 int destType = BufferedImage.TYPE_INT_RGB; |
| 202 BufferedImage img2 = new BufferedImage(w, h, destType); | |
| 140 | 203 img2.createGraphics().drawImage(img, null, 0, 0); |
| 204 img = img2; | |
| 205 } | |
| 206 | |
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207 // render output |
| 207 | 208 logger.debug("writing"); |
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209 if (ImageIO.write(img, type, ostream)) { |
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210 // writing was OK |
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211 return; |
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212 } else { |
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213 throw new FileOpException("Error writing image: Unknown image format!"); |
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214 } |
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215 } catch (IOException e) { |
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216 throw new FileOpException("Error writing image."); |
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217 } |
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218 } |
| 1 | 219 |
| 149 | 220 public void scale(double scale, double scaleY) throws ImageOpException { |
| 207 | 221 logger.debug("scale"); |
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222 /* for downscaling in high quality the image is blurred first */ |
| 144 | 223 if ((scale <= 0.5) && (quality > 1)) { |
| 224 int bl = (int) Math.floor(1 / scale); | |
| 225 blur(bl); | |
| 226 } | |
| 207 | 227 /* then scaled */ |
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228 AffineTransformOp scaleOp = |
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229 new AffineTransformOp( |
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230 AffineTransform.getScaleInstance(scale, scale), |
| 207 | 231 renderHint); |
| 144 | 232 BufferedImage scaledImg = null; |
| 207 | 233 // enforce destination image type (*Java2D BUG*) |
| 220 | 234 int type = img.getType(); |
| 235 // FIXME: which type would be best? | |
| 236 if ((quality > 0)&&(type != 0)) { | |
| 207 | 237 logger.debug("creating destination image"); |
| 144 | 238 Rectangle2D dstBounds = scaleOp.getBounds2D(img); |
| 239 scaledImg = | |
| 240 new BufferedImage( | |
| 241 (int) dstBounds.getWidth(), | |
| 242 (int) dstBounds.getHeight(), | |
| 220 | 243 type); |
| 144 | 244 } |
| 207 | 245 logger.debug("scaling..."); |
| 144 | 246 scaledImg = scaleOp.filter(img, scaledImg); |
| 207 | 247 logger.debug("destination image type "+scaledImg.getType()); |
| 248 if (scaledImg == null) { | |
| 249 throw new ImageOpException("Unable to scale"); | |
| 250 } | |
| 144 | 251 //DEBUG |
| 181 | 252 logger.debug("SCALE: " |
| 144 | 253 + scale |
| 254 + " ->" | |
| 255 + scaledImg.getWidth() | |
| 256 + "x" | |
| 257 + scaledImg.getHeight()); | |
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258 img = scaledImg; |
| 207 | 259 scaledImg = null; |
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260 } |
| 1 | 261 |
| 144 | 262 public void blur(int radius) throws ImageOpException { |
| 263 //DEBUG | |
| 181 | 264 logger.debug("blur: " + radius); |
| 144 | 265 // minimum radius is 2 |
| 266 int klen = Math.max(radius, 2); | |
| 220 | 267 // FIXME: use constant kernels for most common sizes |
| 144 | 268 int ksize = klen * klen; |
| 269 // kernel is constant 1/k | |
| 270 float f = 1f / ksize; | |
| 271 float[] kern = new float[ksize]; | |
| 272 for (int i = 0; i < ksize; i++) { | |
| 273 kern[i] = f; | |
| 274 } | |
| 275 Kernel blur = new Kernel(klen, klen, kern); | |
| 276 // blur with convolve operation | |
| 207 | 277 ConvolveOp blurOp = new ConvolveOp(blur, ConvolveOp.EDGE_NO_OP, renderHint); |
| 145 | 278 // blur needs explicit destination image type for color *Java2D BUG* |
| 279 BufferedImage blurredImg = null; | |
| 280 if (img.getType() == BufferedImage.TYPE_3BYTE_BGR) { | |
| 281 blurredImg = | |
| 282 new BufferedImage( | |
| 283 img.getWidth(), | |
| 284 img.getHeight(), | |
| 285 img.getType()); | |
| 286 } | |
| 287 blurredImg = blurOp.filter(img, blurredImg); | |
| 144 | 288 if (blurredImg == null) { |
| 289 throw new ImageOpException("Unable to scale"); | |
| 290 } | |
| 291 img = blurredImg; | |
| 292 } | |
| 293 | |
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294 public void crop(int x_off, int y_off, int width, int height) |
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295 throws ImageOpException { |
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296 // setup Crop |
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297 BufferedImage croppedImg = img.getSubimage(x_off, y_off, width, height); |
| 181 | 298 logger.debug("CROP:" + croppedImg.getWidth() + "x" + croppedImg.getHeight()); |
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299 //DEBUG |
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300 // util.dprintln(2, " time |
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301 // "+(System.currentTimeMillis()-startTime)+"ms"); |
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302 if (croppedImg == null) { |
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303 throw new ImageOpException("Unable to crop"); |
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304 } |
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305 img = croppedImg; |
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306 } |
| 1 | 307 |
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308 public void enhance(float mult, float add) throws ImageOpException { |
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309 /* |
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310 * Only one constant should work regardless of the number of bands |
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311 * according to the JDK spec. Doesn't work on JDK 1.4 for OSX and Linux |
| 207 | 312 * (at least). |
| 313 * RescaleOp scaleOp = new RescaleOp( (float)mult, | |
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314 * (float)add, null); scaleOp.filter(img, img); |
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315 */ |
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316 |
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317 /* The number of constants must match the number of bands in the image. */ |
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318 int ncol = img.getColorModel().getNumComponents(); |
| 86 | 319 float[] dm = new float[ncol]; |
| 320 float[] da = new float[ncol]; | |
| 321 for (int i = 0; i < ncol; i++) { | |
| 322 dm[i] = (float) mult; | |
| 323 da[i] = (float) add; | |
| 85 | 324 } |
| 86 | 325 RescaleOp scaleOp = new RescaleOp(dm, da, null); |
| 85 | 326 scaleOp.filter(img, img); |
| 327 } | |
| 328 | |
| 86 | 329 public void enhanceRGB(float[] rgbm, float[] rgba) |
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330 throws ImageOpException { |
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331 |
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332 /* |
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333 * The number of constants must match the number of bands in the image. |
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334 * We do only 3 (RGB) bands. |
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335 */ |
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336 |
| 86 | 337 int ncol = img.getColorModel().getNumColorComponents(); |
| 338 if ((ncol != 3) || (rgbm.length != 3) || (rgba.length != 3)) { | |
| 181 | 339 logger.debug("ERROR(enhance): unknown number of color bands or coefficients (" |
| 86 | 340 + ncol |
| 341 + ")"); | |
| 342 return; | |
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343 } |
| 89 | 344 RescaleOp scaleOp = |
| 345 new RescaleOp(rgbOrdered(rgbm), rgbOrdered(rgba), null); | |
| 86 | 346 scaleOp.filter(img, img); |
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347 } |
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348 |
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349 /** |
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350 * Ensures that the array f is in the right order to map the images RGB |
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351 * components. (not shure what happens |
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352 */ |
| 86 | 353 public float[] rgbOrdered(float[] fa) { |
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354 /* |
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355 * TODO: this is UGLY, UGLY!! |
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356 */ |
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357 float[] fb; |
| 86 | 358 int t = img.getType(); |
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359 if (img.getColorModel().hasAlpha()) { |
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360 fb = new float[4]; |
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361 if ((t == BufferedImage.TYPE_INT_ARGB) |
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362 || (t == BufferedImage.TYPE_INT_ARGB_PRE)) { |
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363 // RGB Type |
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364 fb[0] = fa[0]; |
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365 fb[1] = fa[1]; |
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366 fb[2] = fa[2]; |
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367 fb[3] = 1f; |
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368 } else { |
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369 // this isn't tested :-( |
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370 fb[0] = 1f; |
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371 fb[1] = fa[0]; |
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372 fb[2] = fa[1]; |
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373 fb[3] = fa[2]; |
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374 } |
| 86 | 375 } else { |
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376 fb = new float[3]; |
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377 if (t == BufferedImage.TYPE_3BYTE_BGR) { |
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378 // BGR Type (actually it looks like RBG...) |
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379 fb[0] = fa[0]; |
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380 fb[1] = fa[2]; |
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381 fb[2] = fa[1]; |
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382 } else { |
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383 fb[0] = fa[0]; |
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384 fb[1] = fa[1]; |
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385 fb[2] = fa[2]; |
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386 } |
| 86 | 387 } |
| 388 return fb; | |
| 85 | 389 } |
| 390 | |
| 140 | 391 public void rotate(double angle) throws ImageOpException { |
| 89 | 392 // setup rotation |
| 393 double rangle = Math.toRadians(angle); | |
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394 // create offset to make shure the rotated image has no negative |
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395 // coordinates |
| 101 | 396 double w = img.getWidth(); |
| 397 double h = img.getHeight(); | |
| 103 | 398 AffineTransform trafo = new AffineTransform(); |
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399 // center of rotation |
| 103 | 400 double x = (w / 2); |
| 401 double y = (h / 2); | |
| 101 | 402 trafo.rotate(rangle, x, y); |
| 103 | 403 // try rotation to see how far we're out of bounds |
| 207 | 404 AffineTransformOp rotOp = new AffineTransformOp(trafo, renderHint); |
| 103 | 405 Rectangle2D rotbounds = rotOp.getBounds2D(img); |
| 406 double xoff = rotbounds.getX(); | |
| 407 double yoff = rotbounds.getY(); | |
| 408 // move image back in line | |
| 140 | 409 trafo.preConcatenate( |
| 410 AffineTransform.getTranslateInstance(-xoff, -yoff)); | |
| 101 | 411 // transform image |
| 207 | 412 rotOp = new AffineTransformOp(trafo, renderHint); |
| 89 | 413 BufferedImage rotImg = rotOp.filter(img, null); |
| 101 | 414 // calculate new bounding box |
| 103 | 415 //Rectangle2D bounds = rotOp.getBounds2D(img); |
| 89 | 416 if (rotImg == null) { |
| 417 throw new ImageOpException("Unable to rotate"); | |
| 418 } | |
| 103 | 419 img = rotImg; |
| 101 | 420 // crop new image (with self-made rounding) |
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421 /* |
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422 * img = rotImg.getSubimage( (int) (bounds.getX()+0.5), (int) |
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423 * (bounds.getY()+0.5), (int) (bounds.getWidth()+0.5), (int) |
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424 * (bounds.getHeight()+0.5)); |
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425 */ |
| 86 | 426 } |
| 85 | 427 |
| 89 | 428 public void mirror(double angle) throws ImageOpException { |
| 429 // setup mirror | |
| 430 double mx = 1; | |
| 431 double my = 1; | |
| 432 double tx = 0; | |
| 433 double ty = 0; | |
| 144 | 434 if (Math.abs(angle - 0) < epsilon) { // 0 degree |
| 89 | 435 mx = -1; |
| 436 tx = getWidth(); | |
| 144 | 437 } else if (Math.abs(angle - 90) < epsilon) { // 90 degree |
| 89 | 438 my = -1; |
| 439 ty = getHeight(); | |
| 144 | 440 } else if (Math.abs(angle - 180) < epsilon) { // 180 degree |
| 89 | 441 mx = -1; |
| 442 tx = getWidth(); | |
| 144 | 443 } else if (Math.abs(angle - 270) < epsilon) { // 270 degree |
| 89 | 444 my = -1; |
| 445 ty = getHeight(); | |
| 144 | 446 } else if (Math.abs(angle - 360) < epsilon) { // 360 degree |
| 89 | 447 mx = -1; |
| 448 tx = getWidth(); | |
| 449 } | |
| 450 AffineTransformOp mirOp = | |
| 451 new AffineTransformOp( | |
| 452 new AffineTransform(mx, 0, 0, my, tx, ty), | |
| 207 | 453 renderHint); |
| 89 | 454 BufferedImage mirImg = mirOp.filter(img, null); |
| 455 if (mirImg == null) { | |
| 456 throw new ImageOpException("Unable to mirror"); | |
| 457 } | |
| 458 img = mirImg; | |
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459 } |
| 86 | 460 |
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461 /* (non-Javadoc) @see java.lang.Object#finalize() */ |
| 148 | 462 protected void finalize() throws Throwable { |
| 207 | 463 dispose(); |
| 464 super.finalize(); | |
| 465 } | |
| 466 | |
| 467 public void dispose() { | |
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468 // we must dispose the ImageReader because it keeps the filehandle |
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469 // open! |
| 148 | 470 reader.dispose(); |
| 471 reader = null; | |
| 472 img = null; | |
| 473 } | |
| 474 | |
| 1 | 475 } |