Mercurial > hg > digilib-old
annotate servlet/src/digilib/image/ImageLoaderDocuImage.java @ 205:6221d688eab6
Servlet version 1.18b9 -- cleanup and bugfixes
- fixed bug with slow color JPEGs
- better pathname handling
- better filehandle cleanup (hopefully)
| author | robcast |
|---|---|
| date | Fri, 12 Mar 2004 19:52:06 +0100 |
| parents | afe7ff98bb71 |
| children | 1a65d8e43620 |
| 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; |
| 73 | 23 import java.awt.geom.AffineTransform; |
| 101 | 24 import java.awt.geom.Rectangle2D; |
| 73 | 25 import java.awt.image.AffineTransformOp; |
| 26 import java.awt.image.BufferedImage; | |
| 144 | 27 import java.awt.image.ConvolveOp; |
| 28 import java.awt.image.Kernel; | |
| 85 | 29 import java.awt.image.RescaleOp; |
| 73 | 30 import java.io.File; |
| 31 import java.io.IOException; | |
|
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32 import java.io.OutputStream; |
| 89 | 33 import java.io.RandomAccessFile; |
| 85 | 34 import java.util.Iterator; |
| 1 | 35 |
| 73 | 36 import javax.imageio.ImageIO; |
| 85 | 37 import javax.imageio.ImageReadParam; |
| 38 import javax.imageio.ImageReader; | |
| 39 import javax.imageio.stream.ImageInputStream; | |
| 1 | 40 |
| 159 | 41 import digilib.io.ImageFile; |
| 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 { |
| 181 | 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) { | |
| 181 | 65 logger.debug("quality q1"); |
| 85 | 66 interpol = AffineTransformOp.TYPE_BILINEAR; |
| 67 } else { | |
| 181 | 68 logger.debug("quality q0"); |
| 85 | 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) { | |
| 181 | 82 logger.debug("error in getHeight", e); |
| 85 | 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) { | |
| 181 | 96 logger.debug("error in getHeight", e); |
| 85 | 97 } |
| 98 return w; | |
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99 } |
| 1 | 100 |
| 86 | 101 /* load image file */ |
| 159 | 102 public void loadImage(ImageFile f) throws FileOpException { |
| 181 | 103 logger.debug("loadImage!"); |
| 159 | 104 //System.gc(); |
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105 try { |
| 149 | 106 img = ImageIO.read(f.getFile()); |
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107 if (img == null) { |
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108 throw new FileOpException("Unable to load File!"); |
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109 } |
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110 } catch (IOException e) { |
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111 throw new FileOpException("Error reading image."); |
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112 } |
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113 } |
| 1 | 114 |
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115 /** Get an ImageReader for the image file. */ |
| 159 | 116 public void preloadImage(ImageFile f) throws IOException { |
| 148 | 117 if (reader != null) { |
| 118 // clean up old reader | |
| 119 reader.dispose(); | |
| 120 reader = null; | |
| 121 } | |
| 159 | 122 //System.gc(); |
| 149 | 123 RandomAccessFile rf = new RandomAccessFile(f.getFile(), "r"); |
| 89 | 124 ImageInputStream istream = ImageIO.createImageInputStream(rf); |
| 149 | 125 //Iterator readers = ImageIO.getImageReaders(istream); |
| 126 //String ext = f.getName().substring(f.getName().lastIndexOf('.')+1); | |
| 127 //Iterator readers = ImageIO.getImageReadersBySuffix(ext); | |
| 128 Iterator readers = ImageIO.getImageReadersByMIMEType(f.getMimetype()); | |
| 89 | 129 reader = (ImageReader) readers.next(); |
| 149 | 130 /* are there more readers? */ |
| 181 | 131 logger.debug("this reader: " + reader.getClass()); |
| 140 | 132 while (readers.hasNext()) { |
| 181 | 133 logger.debug("next reader: " + readers.next().getClass()); |
| 140 | 134 } |
| 149 | 135 //*/ |
| 89 | 136 reader.setInput(istream); |
| 85 | 137 if (reader == null) { |
| 138 throw new FileOpException("Unable to load File!"); | |
| 139 } | |
| 149 | 140 imgFile = f.getFile(); |
| 85 | 141 } |
| 142 | |
| 143 /* Load an image file into the Object. */ | |
| 159 | 144 public void loadSubimage(ImageFile f, Rectangle region, int prescale) |
| 85 | 145 throws FileOpException { |
| 159 | 146 //System.gc(); |
| 85 | 147 try { |
| 149 | 148 if ((reader == null) || (imgFile != f.getFile())) { |
| 85 | 149 preloadImage(f); |
| 150 } | |
| 151 // set up reader parameters | |
| 152 ImageReadParam readParam = reader.getDefaultReadParam(); | |
| 153 readParam.setSourceRegion(region); | |
| 154 readParam.setSourceSubsampling(prescale, prescale, 0, 0); | |
| 155 // read image | |
| 156 img = reader.read(0, readParam); | |
| 157 } catch (IOException e) { | |
| 158 throw new FileOpException("Unable to load File!"); | |
| 159 } | |
| 160 if (img == null) { | |
| 161 throw new FileOpException("Unable to load File!"); | |
| 162 } | |
| 163 } | |
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164 |
| 86 | 165 /* write image of type mt to Stream */ |
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166 public void writeImage(String mt, OutputStream ostream) |
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167 throws FileOpException { |
| 181 | 168 logger.debug("writeImage!"); |
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169 try { |
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170 // setup output |
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171 String type = "png"; |
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172 if (mt == "image/jpeg") { |
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173 type = "jpeg"; |
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174 } else if (mt == "image/png") { |
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175 type = "png"; |
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176 } else { |
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177 // unknown mime type |
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178 throw new FileOpException("Unknown mime type: " + mt); |
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179 } |
| 140 | 180 |
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181 /* |
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182 * JPEG doesn't do transparency so we have to convert any RGBA |
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183 * image to RGB :-( *Java2D BUG* |
| 140 | 184 */ |
| 185 if ((type == "jpeg") && (img.getColorModel().hasAlpha())) { | |
| 181 | 186 logger.debug("BARF: JPEG with transparency!!"); |
| 140 | 187 int w = img.getWidth(); |
| 188 int h = img.getHeight(); | |
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189 // BufferedImage.TYPE_INT_RGB seems to be fastest (JDK1.4.1, |
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190 // OSX) |
| 144 | 191 int destType = BufferedImage.TYPE_INT_RGB; |
| 192 BufferedImage img2 = new BufferedImage(w, h, destType); | |
| 140 | 193 img2.createGraphics().drawImage(img, null, 0, 0); |
| 194 img = img2; | |
| 195 } | |
| 196 | |
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197 // render output |
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198 if (ImageIO.write(img, type, ostream)) { |
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199 // writing was OK |
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200 return; |
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201 } else { |
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202 throw new FileOpException("Error writing image: Unknown image format!"); |
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203 } |
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204 } catch (IOException e) { |
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205 throw new FileOpException("Error writing image."); |
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206 } |
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207 } |
| 1 | 208 |
| 149 | 209 public void scale(double scale, double scaleY) throws ImageOpException { |
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210 /* for downscaling in high quality the image is blurred first */ |
| 144 | 211 if ((scale <= 0.5) && (quality > 1)) { |
| 212 int bl = (int) Math.floor(1 / scale); | |
| 213 blur(bl); | |
| 214 } | |
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215 /* and scaled */ |
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216 AffineTransformOp scaleOp = |
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217 new AffineTransformOp( |
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218 AffineTransform.getScaleInstance(scale, scale), |
| 85 | 219 interpol); |
| 144 | 220 BufferedImage scaledImg = null; |
| 221 // enforce grey destination image for greyscale *Java2D BUG* | |
| 222 if ((quality > 0) | |
| 145 | 223 && (img.getColorModel().getNumColorComponents() == 1)) { |
| 144 | 224 Rectangle2D dstBounds = scaleOp.getBounds2D(img); |
| 225 scaledImg = | |
| 226 new BufferedImage( | |
| 227 (int) dstBounds.getWidth(), | |
| 228 (int) dstBounds.getHeight(), | |
| 229 img.getType()); | |
| 230 } | |
| 231 scaledImg = scaleOp.filter(img, scaledImg); | |
| 232 //DEBUG | |
| 181 | 233 logger.debug("SCALE: " |
| 144 | 234 + scale |
| 235 + " ->" | |
| 236 + scaledImg.getWidth() | |
| 237 + "x" | |
| 238 + scaledImg.getHeight()); | |
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239 if (scaledImg == null) { |
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240 throw new ImageOpException("Unable to scale"); |
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241 } |
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242 img = scaledImg; |
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243 } |
| 1 | 244 |
| 144 | 245 public void blur(int radius) throws ImageOpException { |
| 246 //DEBUG | |
| 181 | 247 logger.debug("blur: " + radius); |
| 144 | 248 // minimum radius is 2 |
| 249 int klen = Math.max(radius, 2); | |
| 250 int ksize = klen * klen; | |
| 251 // kernel is constant 1/k | |
| 252 float f = 1f / ksize; | |
| 253 float[] kern = new float[ksize]; | |
| 254 for (int i = 0; i < ksize; i++) { | |
| 255 kern[i] = f; | |
| 256 } | |
| 257 Kernel blur = new Kernel(klen, klen, kern); | |
| 258 // blur with convolve operation | |
| 259 ConvolveOp blurOp = new ConvolveOp(blur, ConvolveOp.EDGE_NO_OP, null); | |
| 145 | 260 // blur needs explicit destination image type for color *Java2D BUG* |
| 261 BufferedImage blurredImg = null; | |
| 262 if (img.getType() == BufferedImage.TYPE_3BYTE_BGR) { | |
| 263 blurredImg = | |
| 264 new BufferedImage( | |
| 265 img.getWidth(), | |
| 266 img.getHeight(), | |
| 267 img.getType()); | |
| 268 } | |
| 269 blurredImg = blurOp.filter(img, blurredImg); | |
| 144 | 270 if (blurredImg == null) { |
| 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); |
| 181 | 280 logger.debug("CROP:" + croppedImg.getWidth() + "x" + croppedImg.getHeight()); |
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281 //DEBUG |
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282 // util.dprintln(2, " time |
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283 // "+(System.currentTimeMillis()-startTime)+"ms"); |
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284 if (croppedImg == null) { |
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285 throw new ImageOpException("Unable to crop"); |
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286 } |
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287 img = croppedImg; |
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288 } |
| 1 | 289 |
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290 public void enhance(float mult, float add) throws ImageOpException { |
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291 /* |
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292 * Only one constant should work regardless of the number of bands |
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293 * according to the JDK spec. Doesn't work on JDK 1.4 for OSX and Linux |
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294 * (at least). RescaleOp scaleOp = new RescaleOp( (float)mult, |
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295 * (float)add, null); scaleOp.filter(img, img); |
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296 */ |
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297 |
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298 /* The number of constants must match the number of bands in the image. */ |
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299 int ncol = img.getColorModel().getNumComponents(); |
| 86 | 300 float[] dm = new float[ncol]; |
| 301 float[] da = new float[ncol]; | |
| 302 for (int i = 0; i < ncol; i++) { | |
| 303 dm[i] = (float) mult; | |
| 304 da[i] = (float) add; | |
| 85 | 305 } |
| 86 | 306 RescaleOp scaleOp = new RescaleOp(dm, da, null); |
| 85 | 307 scaleOp.filter(img, img); |
| 308 } | |
| 309 | |
| 86 | 310 public void enhanceRGB(float[] rgbm, float[] rgba) |
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311 throws ImageOpException { |
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312 |
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313 /* |
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314 * The number of constants must match the number of bands in the image. |
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315 * We do only 3 (RGB) bands. |
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316 */ |
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317 |
| 86 | 318 int ncol = img.getColorModel().getNumColorComponents(); |
| 319 if ((ncol != 3) || (rgbm.length != 3) || (rgba.length != 3)) { | |
| 181 | 320 logger.debug("ERROR(enhance): unknown number of color bands or coefficients (" |
| 86 | 321 + ncol |
| 322 + ")"); | |
| 323 return; | |
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324 } |
| 89 | 325 RescaleOp scaleOp = |
| 326 new RescaleOp(rgbOrdered(rgbm), rgbOrdered(rgba), null); | |
| 86 | 327 scaleOp.filter(img, img); |
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328 } |
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329 |
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330 /** |
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331 * Ensures that the array f is in the right order to map the images RGB |
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332 * components. (not shure what happens |
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333 */ |
| 86 | 334 public float[] rgbOrdered(float[] fa) { |
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335 /* |
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336 * TODO: this is UGLY, UGLY!! |
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337 */ |
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338 float[] fb; |
| 86 | 339 int t = img.getType(); |
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340 if (img.getColorModel().hasAlpha()) { |
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341 fb = new float[4]; |
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342 if ((t == BufferedImage.TYPE_INT_ARGB) |
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343 || (t == BufferedImage.TYPE_INT_ARGB_PRE)) { |
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344 // RGB Type |
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345 fb[0] = fa[0]; |
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346 fb[1] = fa[1]; |
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347 fb[2] = fa[2]; |
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348 fb[3] = 1f; |
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349 } else { |
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350 // this isn't tested :-( |
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351 fb[0] = 1f; |
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352 fb[1] = fa[0]; |
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353 fb[2] = fa[1]; |
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354 fb[3] = fa[2]; |
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355 } |
| 86 | 356 } else { |
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357 fb = new float[3]; |
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358 if (t == BufferedImage.TYPE_3BYTE_BGR) { |
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359 // BGR Type (actually it looks like RBG...) |
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360 fb[0] = fa[0]; |
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361 fb[1] = fa[2]; |
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362 fb[2] = fa[1]; |
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363 } else { |
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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 } |
| 86 | 368 } |
| 369 return fb; | |
| 85 | 370 } |
| 371 | |
| 140 | 372 public void rotate(double angle) throws ImageOpException { |
| 89 | 373 // setup rotation |
| 374 double rangle = Math.toRadians(angle); | |
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375 // create offset to make shure the rotated image has no negative |
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376 // coordinates |
| 101 | 377 double w = img.getWidth(); |
| 378 double h = img.getHeight(); | |
| 103 | 379 AffineTransform trafo = new AffineTransform(); |
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380 // center of rotation |
| 103 | 381 double x = (w / 2); |
| 382 double y = (h / 2); | |
| 101 | 383 trafo.rotate(rangle, x, y); |
| 103 | 384 // try rotation to see how far we're out of bounds |
| 385 AffineTransformOp rotOp = new AffineTransformOp(trafo, interpol); | |
| 386 Rectangle2D rotbounds = rotOp.getBounds2D(img); | |
| 387 double xoff = rotbounds.getX(); | |
| 388 double yoff = rotbounds.getY(); | |
| 389 // move image back in line | |
| 140 | 390 trafo.preConcatenate( |
| 391 AffineTransform.getTranslateInstance(-xoff, -yoff)); | |
| 101 | 392 // transform image |
| 103 | 393 rotOp = new AffineTransformOp(trafo, interpol); |
| 89 | 394 BufferedImage rotImg = rotOp.filter(img, null); |
| 101 | 395 // calculate new bounding box |
| 103 | 396 //Rectangle2D bounds = rotOp.getBounds2D(img); |
| 89 | 397 if (rotImg == null) { |
| 398 throw new ImageOpException("Unable to rotate"); | |
| 399 } | |
| 103 | 400 img = rotImg; |
| 101 | 401 // crop new image (with self-made rounding) |
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402 /* |
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403 * img = rotImg.getSubimage( (int) (bounds.getX()+0.5), (int) |
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404 * (bounds.getY()+0.5), (int) (bounds.getWidth()+0.5), (int) |
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405 * (bounds.getHeight()+0.5)); |
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406 */ |
| 86 | 407 } |
| 85 | 408 |
| 89 | 409 public void mirror(double angle) throws ImageOpException { |
| 410 // setup mirror | |
| 411 double mx = 1; | |
| 412 double my = 1; | |
| 413 double tx = 0; | |
| 414 double ty = 0; | |
| 144 | 415 if (Math.abs(angle - 0) < epsilon) { // 0 degree |
| 89 | 416 mx = -1; |
| 417 tx = getWidth(); | |
| 144 | 418 } else if (Math.abs(angle - 90) < epsilon) { // 90 degree |
| 89 | 419 my = -1; |
| 420 ty = getHeight(); | |
| 144 | 421 } else if (Math.abs(angle - 180) < epsilon) { // 180 degree |
| 89 | 422 mx = -1; |
| 423 tx = getWidth(); | |
| 144 | 424 } else if (Math.abs(angle - 270) < epsilon) { // 270 degree |
| 89 | 425 my = -1; |
| 426 ty = getHeight(); | |
| 144 | 427 } else if (Math.abs(angle - 360) < epsilon) { // 360 degree |
| 89 | 428 mx = -1; |
| 429 tx = getWidth(); | |
| 430 } | |
| 431 AffineTransformOp mirOp = | |
| 432 new AffineTransformOp( | |
| 433 new AffineTransform(mx, 0, 0, my, tx, ty), | |
| 434 interpol); | |
| 435 BufferedImage mirImg = mirOp.filter(img, null); | |
| 436 if (mirImg == null) { | |
| 437 throw new ImageOpException("Unable to mirror"); | |
| 438 } | |
| 439 img = mirImg; | |
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440 } |
| 86 | 441 |
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442 /* (non-Javadoc) @see java.lang.Object#finalize() */ |
| 148 | 443 protected void finalize() throws Throwable { |
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444 // we must dispose the ImageReader because it keeps the filehandle |
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445 // open! |
| 148 | 446 reader.dispose(); |
| 447 reader = null; | |
| 448 img = null; | |
| 449 super.finalize(); | |
| 450 } | |
| 451 | |
| 1 | 452 } |