Mercurial > hg > digilib-old
annotate servlet/src/digilib/image/ImageLoaderDocuImage.java @ 176:67ff8c7fecb9
Servlet version 1.17b2
- new mapping file for "virtual directories"
- direct file URLs now work without extension (even with wrong ones)
| author | robcast |
|---|---|
| date | Mon, 10 Nov 2003 20:59:00 +0100 |
| parents | d40922628e4a |
| children | afe7ff98bb71 |
| 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 { |
| 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 */ |
| 159 | 102 public void loadImage(ImageFile f) throws FileOpException { |
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103 util.dprintln(10, "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 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 |
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116 /** Get an ImageReader for the image file. */ |
| 159 | 117 public void preloadImage(ImageFile f) throws IOException { |
| 148 | 118 if (reader != null) { |
| 119 // clean up old reader | |
| 120 reader.dispose(); | |
| 121 reader = null; | |
| 122 } | |
| 159 | 123 //System.gc(); |
| 149 | 124 RandomAccessFile rf = new RandomAccessFile(f.getFile(), "r"); |
| 89 | 125 ImageInputStream istream = ImageIO.createImageInputStream(rf); |
| 149 | 126 //Iterator readers = ImageIO.getImageReaders(istream); |
| 127 //String ext = f.getName().substring(f.getName().lastIndexOf('.')+1); | |
| 128 //Iterator readers = ImageIO.getImageReadersBySuffix(ext); | |
| 129 Iterator readers = ImageIO.getImageReadersByMIMEType(f.getMimetype()); | |
| 89 | 130 reader = (ImageReader) readers.next(); |
| 149 | 131 /* are there more readers? */ |
| 140 | 132 System.out.println("this reader: " + reader.getClass()); |
| 133 while (readers.hasNext()) { | |
| 134 System.out.println("next reader: " + readers.next().getClass()); | |
| 135 } | |
| 149 | 136 //*/ |
| 89 | 137 reader.setInput(istream); |
| 85 | 138 if (reader == null) { |
| 139 util.dprintln(3, "ERROR(loadImage): unable to load file"); | |
| 140 throw new FileOpException("Unable to load File!"); | |
| 141 } | |
| 149 | 142 imgFile = f.getFile(); |
| 85 | 143 } |
| 144 | |
| 145 /* Load an image file into the Object. */ | |
| 159 | 146 public void loadSubimage(ImageFile f, Rectangle region, int prescale) |
| 85 | 147 throws FileOpException { |
| 159 | 148 //System.gc(); |
| 85 | 149 try { |
| 149 | 150 if ((reader == null) || (imgFile != f.getFile())) { |
| 85 | 151 preloadImage(f); |
| 152 } | |
| 153 // set up reader parameters | |
| 154 ImageReadParam readParam = reader.getDefaultReadParam(); | |
| 155 readParam.setSourceRegion(region); | |
| 156 readParam.setSourceSubsampling(prescale, prescale, 0, 0); | |
| 157 // read image | |
| 158 img = reader.read(0, readParam); | |
| 159 } catch (IOException e) { | |
| 160 util.dprintln(3, "ERROR(loadImage): unable to load file"); | |
| 161 throw new FileOpException("Unable to load File!"); | |
| 162 } | |
| 163 if (img == null) { | |
| 164 util.dprintln(3, "ERROR(loadImage): unable to load file"); | |
| 165 throw new FileOpException("Unable to load File!"); | |
| 166 } | |
| 167 } | |
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168 |
| 86 | 169 /* write image of type mt to Stream */ |
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170 public void writeImage(String mt, OutputStream ostream) |
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171 throws FileOpException { |
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172 util.dprintln(10, "writeImage!"); |
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173 try { |
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174 // setup output |
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175 String type = "png"; |
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176 if (mt == "image/jpeg") { |
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177 type = "jpeg"; |
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178 } else if (mt == "image/png") { |
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179 type = "png"; |
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180 } else { |
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181 // unknown mime type |
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182 util.dprintln(2, "ERROR(writeImage): Unknown mime type " + mt); |
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183 throw new FileOpException("Unknown mime type: " + mt); |
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184 } |
| 140 | 185 |
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186 /* |
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187 * JPEG doesn't do transparency so we have to convert any RGBA |
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188 * image to RGB :-( *Java2D BUG* |
| 140 | 189 */ |
| 190 if ((type == "jpeg") && (img.getColorModel().hasAlpha())) { | |
| 191 util.dprintln(2, "BARF: JPEG with transparency!!"); | |
| 192 int w = img.getWidth(); | |
| 193 int h = img.getHeight(); | |
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194 // BufferedImage.TYPE_INT_RGB seems to be fastest (JDK1.4.1, |
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195 // OSX) |
| 144 | 196 int destType = BufferedImage.TYPE_INT_RGB; |
| 197 BufferedImage img2 = new BufferedImage(w, h, destType); | |
| 140 | 198 img2.createGraphics().drawImage(img, null, 0, 0); |
| 199 img = img2; | |
| 200 } | |
| 201 | |
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202 // render output |
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203 if (ImageIO.write(img, type, ostream)) { |
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204 // writing was OK |
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205 return; |
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206 } else { |
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207 throw new FileOpException("Error writing image: Unknown image format!"); |
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208 } |
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209 } catch (IOException e) { |
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210 // e.printStackTrace(); |
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211 throw new FileOpException("Error writing image."); |
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212 } |
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213 } |
| 1 | 214 |
| 149 | 215 public void scale(double scale, double scaleY) throws ImageOpException { |
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216 /* for downscaling in high quality the image is blurred first */ |
| 144 | 217 if ((scale <= 0.5) && (quality > 1)) { |
| 218 int bl = (int) Math.floor(1 / scale); | |
| 219 blur(bl); | |
| 220 } | |
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221 /* and scaled */ |
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222 AffineTransformOp scaleOp = |
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223 new AffineTransformOp( |
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224 AffineTransform.getScaleInstance(scale, scale), |
| 85 | 225 interpol); |
| 144 | 226 BufferedImage scaledImg = null; |
| 227 // enforce grey destination image for greyscale *Java2D BUG* | |
| 228 if ((quality > 0) | |
| 145 | 229 && (img.getColorModel().getNumColorComponents() == 1)) { |
| 144 | 230 Rectangle2D dstBounds = scaleOp.getBounds2D(img); |
| 231 scaledImg = | |
| 232 new BufferedImage( | |
| 233 (int) dstBounds.getWidth(), | |
| 234 (int) dstBounds.getHeight(), | |
| 235 img.getType()); | |
| 236 } | |
| 237 scaledImg = scaleOp.filter(img, scaledImg); | |
| 238 //DEBUG | |
| 239 util.dprintln( | |
| 240 3, | |
| 241 "SCALE: " | |
| 242 + scale | |
| 243 + " ->" | |
| 244 + scaledImg.getWidth() | |
| 245 + "x" | |
| 246 + scaledImg.getHeight()); | |
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247 if (scaledImg == null) { |
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248 util.dprintln(2, "ERROR(cropAndScale): error in scale"); |
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249 throw new ImageOpException("Unable to scale"); |
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250 } |
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251 img = scaledImg; |
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252 } |
| 1 | 253 |
| 144 | 254 public void blur(int radius) throws ImageOpException { |
| 255 //DEBUG | |
| 256 util.dprintln(4, "blur: " + radius); | |
| 257 // minimum radius is 2 | |
| 258 int klen = Math.max(radius, 2); | |
| 259 int ksize = klen * klen; | |
| 260 // kernel is constant 1/k | |
| 261 float f = 1f / ksize; | |
| 262 float[] kern = new float[ksize]; | |
| 263 for (int i = 0; i < ksize; i++) { | |
| 264 kern[i] = f; | |
| 265 } | |
| 266 Kernel blur = new Kernel(klen, klen, kern); | |
| 267 // blur with convolve operation | |
| 268 ConvolveOp blurOp = new ConvolveOp(blur, ConvolveOp.EDGE_NO_OP, null); | |
| 145 | 269 // blur needs explicit destination image type for color *Java2D BUG* |
| 270 BufferedImage blurredImg = null; | |
| 271 if (img.getType() == BufferedImage.TYPE_3BYTE_BGR) { | |
| 272 blurredImg = | |
| 273 new BufferedImage( | |
| 274 img.getWidth(), | |
| 275 img.getHeight(), | |
| 276 img.getType()); | |
| 277 } | |
| 278 blurredImg = blurOp.filter(img, blurredImg); | |
| 144 | 279 if (blurredImg == null) { |
| 280 util.dprintln(2, "ERROR(cropAndScale): error in scale"); | |
| 281 throw new ImageOpException("Unable to scale"); | |
| 282 } | |
| 283 img = blurredImg; | |
| 284 } | |
| 285 | |
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286 public void crop(int x_off, int y_off, int width, int height) |
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287 throws ImageOpException { |
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288 // setup Crop |
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289 BufferedImage croppedImg = img.getSubimage(x_off, y_off, width, height); |
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290 util.dprintln( |
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291 3, |
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292 "CROP:" + croppedImg.getWidth() + "x" + croppedImg.getHeight()); |
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293 //DEBUG |
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294 // util.dprintln(2, " time |
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295 // "+(System.currentTimeMillis()-startTime)+"ms"); |
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296 if (croppedImg == null) { |
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297 util.dprintln(2, "ERROR(cropAndScale): error in crop"); |
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298 throw new ImageOpException("Unable to crop"); |
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299 } |
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300 img = croppedImg; |
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301 } |
| 1 | 302 |
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303 public void enhance(float mult, float add) throws ImageOpException { |
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304 /* |
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305 * Only one constant should work regardless of the number of bands |
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306 * according to the JDK spec. Doesn't work on JDK 1.4 for OSX and Linux |
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307 * (at least). RescaleOp scaleOp = new RescaleOp( (float)mult, |
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308 * (float)add, null); scaleOp.filter(img, img); |
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309 */ |
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310 |
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311 /* The number of constants must match the number of bands in the image. */ |
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312 int ncol = img.getColorModel().getNumComponents(); |
| 86 | 313 float[] dm = new float[ncol]; |
| 314 float[] da = new float[ncol]; | |
| 315 for (int i = 0; i < ncol; i++) { | |
| 316 dm[i] = (float) mult; | |
| 317 da[i] = (float) add; | |
| 85 | 318 } |
| 86 | 319 RescaleOp scaleOp = new RescaleOp(dm, da, null); |
| 85 | 320 scaleOp.filter(img, img); |
| 321 } | |
| 322 | |
| 86 | 323 public void enhanceRGB(float[] rgbm, float[] rgba) |
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324 throws ImageOpException { |
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325 |
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326 /* |
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327 * The number of constants must match the number of bands in the image. |
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328 * We do only 3 (RGB) bands. |
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329 */ |
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330 |
| 86 | 331 int ncol = img.getColorModel().getNumColorComponents(); |
| 332 if ((ncol != 3) || (rgbm.length != 3) || (rgba.length != 3)) { | |
| 333 util.dprintln( | |
| 334 2, | |
| 335 "ERROR(enhance): unknown number of color bands or coefficients (" | |
| 336 + ncol | |
| 337 + ")"); | |
| 338 return; | |
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339 } |
| 89 | 340 RescaleOp scaleOp = |
| 341 new RescaleOp(rgbOrdered(rgbm), rgbOrdered(rgba), null); | |
| 86 | 342 scaleOp.filter(img, img); |
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343 } |
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344 |
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345 /** |
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346 * Ensures that the array f is in the right order to map the images RGB |
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347 * components. (not shure what happens |
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348 */ |
| 86 | 349 public float[] rgbOrdered(float[] fa) { |
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350 /* |
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351 * TODO: this is UGLY, UGLY!! |
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352 */ |
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353 float[] fb; |
| 86 | 354 int t = img.getType(); |
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355 if (img.getColorModel().hasAlpha()) { |
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356 fb = new float[4]; |
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357 if ((t == BufferedImage.TYPE_INT_ARGB) |
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358 || (t == BufferedImage.TYPE_INT_ARGB_PRE)) { |
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359 // RGB Type |
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360 fb[0] = fa[0]; |
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361 fb[1] = fa[1]; |
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362 fb[2] = fa[2]; |
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363 fb[3] = 1f; |
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364 } else { |
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365 // this isn't tested :-( |
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366 fb[0] = 1f; |
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367 fb[1] = fa[0]; |
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368 fb[2] = fa[1]; |
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369 fb[3] = fa[2]; |
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370 } |
| 86 | 371 } else { |
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372 fb = new float[3]; |
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373 if (t == BufferedImage.TYPE_3BYTE_BGR) { |
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374 // BGR Type (actually it looks like RBG...) |
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375 fb[0] = fa[0]; |
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376 fb[1] = fa[2]; |
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377 fb[2] = fa[1]; |
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378 } else { |
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379 fb[0] = fa[0]; |
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380 fb[1] = fa[1]; |
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381 fb[2] = fa[2]; |
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382 } |
| 86 | 383 } |
| 384 return fb; | |
| 85 | 385 } |
| 386 | |
| 140 | 387 public void rotate(double angle) throws ImageOpException { |
| 89 | 388 // setup rotation |
| 389 double rangle = Math.toRadians(angle); | |
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390 // create offset to make shure the rotated image has no negative |
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391 // coordinates |
| 101 | 392 double w = img.getWidth(); |
| 393 double h = img.getHeight(); | |
| 103 | 394 AffineTransform trafo = new AffineTransform(); |
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395 // center of rotation |
| 103 | 396 double x = (w / 2); |
| 397 double y = (h / 2); | |
| 101 | 398 trafo.rotate(rangle, x, y); |
| 103 | 399 // try rotation to see how far we're out of bounds |
| 400 AffineTransformOp rotOp = new AffineTransformOp(trafo, interpol); | |
| 401 Rectangle2D rotbounds = rotOp.getBounds2D(img); | |
| 402 double xoff = rotbounds.getX(); | |
| 403 double yoff = rotbounds.getY(); | |
| 404 // move image back in line | |
| 140 | 405 trafo.preConcatenate( |
| 406 AffineTransform.getTranslateInstance(-xoff, -yoff)); | |
| 101 | 407 // transform image |
| 103 | 408 rotOp = new AffineTransformOp(trafo, interpol); |
| 89 | 409 BufferedImage rotImg = rotOp.filter(img, null); |
| 101 | 410 // calculate new bounding box |
| 103 | 411 //Rectangle2D bounds = rotOp.getBounds2D(img); |
| 89 | 412 if (rotImg == null) { |
| 413 util.dprintln(2, "ERROR: error in rotate"); | |
| 414 throw new ImageOpException("Unable to rotate"); | |
| 415 } | |
| 103 | 416 img = rotImg; |
| 101 | 417 // crop new image (with self-made rounding) |
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418 /* |
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419 * img = rotImg.getSubimage( (int) (bounds.getX()+0.5), (int) |
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420 * (bounds.getY()+0.5), (int) (bounds.getWidth()+0.5), (int) |
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421 * (bounds.getHeight()+0.5)); |
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422 */ |
| 86 | 423 } |
| 85 | 424 |
| 89 | 425 public void mirror(double angle) throws ImageOpException { |
| 426 // setup mirror | |
| 427 double mx = 1; | |
| 428 double my = 1; | |
| 429 double tx = 0; | |
| 430 double ty = 0; | |
| 144 | 431 if (Math.abs(angle - 0) < epsilon) { // 0 degree |
| 89 | 432 mx = -1; |
| 433 tx = getWidth(); | |
| 144 | 434 } else if (Math.abs(angle - 90) < epsilon) { // 90 degree |
| 89 | 435 my = -1; |
| 436 ty = getHeight(); | |
| 144 | 437 } else if (Math.abs(angle - 180) < epsilon) { // 180 degree |
| 89 | 438 mx = -1; |
| 439 tx = getWidth(); | |
| 144 | 440 } else if (Math.abs(angle - 270) < epsilon) { // 270 degree |
| 89 | 441 my = -1; |
| 442 ty = getHeight(); | |
| 144 | 443 } else if (Math.abs(angle - 360) < epsilon) { // 360 degree |
| 89 | 444 mx = -1; |
| 445 tx = getWidth(); | |
| 446 } | |
| 447 AffineTransformOp mirOp = | |
| 448 new AffineTransformOp( | |
| 449 new AffineTransform(mx, 0, 0, my, tx, ty), | |
| 450 interpol); | |
| 451 BufferedImage mirImg = mirOp.filter(img, null); | |
| 452 if (mirImg == null) { | |
| 453 util.dprintln(2, "ERROR: error in mirror"); | |
| 454 throw new ImageOpException("Unable to mirror"); | |
| 455 } | |
| 456 img = mirImg; | |
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457 } |
| 86 | 458 |
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459 /* (non-Javadoc) @see java.lang.Object#finalize() */ |
| 148 | 460 protected void finalize() throws Throwable { |
| 461 //System.out.println("FIN de ImageLoaderDocuImage!"); | |
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462 // we must dispose the ImageReader because it keeps the filehandle |
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463 // open! |
| 148 | 464 reader.dispose(); |
| 465 reader = null; | |
| 466 img = null; | |
| 467 super.finalize(); | |
| 468 } | |
| 469 | |
| 1 | 470 } |