Mercurial > hg > digilib-old
annotate servlet/src/digilib/image/ImageLoaderDocuImage.java @ 103:0e49645f98c8
Servlet V1.9b2
Fixes error in rotation for ImageLoader DocuImage.
| author | robcast |
|---|---|
| date | Mon, 12 May 2003 22:33:44 +0200 |
| parents | 78f52a1876fe |
| children | a32e8c80e2f2 |
| rev | line source |
|---|---|
| 1 | 1 /* ImageLoaderDocuImage -- Image class implementation using JDK 1.4 ImageLoader |
| 2 | |
| 3 Digital Image Library servlet components | |
| 4 | |
| 85 | 5 Copyright (C) 2002, 2003 Robert Casties (robcast@mail.berlios.de) |
| 1 | 6 |
| 7 This program is free software; you can redistribute it and/or modify it | |
| 8 under the terms of the GNU General Public License as published by the | |
| 9 Free Software Foundation; either version 2 of the License, or (at your | |
| 10 option) any later version. | |
| 11 | |
| 12 Please read license.txt for the full details. A copy of the GPL | |
| 13 may be found at http://www.gnu.org/copyleft/lgpl.html | |
| 14 | |
| 15 You should have received a copy of the GNU General Public License | |
| 16 along with this program; if not, write to the Free Software | |
| 17 Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA | |
| 18 | |
| 19 */ | |
| 20 | |
| 21 package digilib.image; | |
| 22 | |
| 86 | 23 import java.awt.Dimension; |
| 85 | 24 import java.awt.Rectangle; |
| 73 | 25 import java.awt.geom.AffineTransform; |
| 101 | 26 import java.awt.geom.Rectangle2D; |
| 73 | 27 import java.awt.image.AffineTransformOp; |
| 28 import java.awt.image.BufferedImage; | |
| 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 |
| 86 | 41 import digilib.io.DocuFile; |
| 73 | 42 import digilib.io.FileOpException; |
| 86 | 43 import digilib.io.FileOps; |
| 1 | 44 |
| 73 | 45 /** Implementation of DocuImage using the ImageLoader API of Java 1.4 and Java2D. */ |
| 1 | 46 public class ImageLoaderDocuImage extends DocuImageImpl { |
| 47 | |
| 86 | 48 /** image object */ |
| 49 protected BufferedImage img; | |
| 50 /** interpolation type */ | |
| 51 protected int interpol; | |
| 52 /** ImageIO image reader */ | |
| 53 protected ImageReader reader; | |
| 54 /** File that was read */ | |
| 55 protected File imgFile; | |
| 85 | 56 |
| 57 /* loadSubimage is supported. */ | |
| 58 public boolean isSubimageSupported() { | |
| 59 return true; | |
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60 } |
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61 |
| 85 | 62 public void setQuality(int qual) { |
| 63 quality = qual; | |
| 64 // setup interpolation quality | |
| 65 if (qual > 0) { | |
| 66 util.dprintln(4, "quality q1"); | |
| 67 interpol = AffineTransformOp.TYPE_BILINEAR; | |
| 68 } else { | |
| 69 util.dprintln(4, "quality q0"); | |
| 70 interpol = AffineTransformOp.TYPE_NEAREST_NEIGHBOR; | |
| 71 } | |
| 72 } | |
| 86 | 73 |
| 85 | 74 public int getHeight() { |
| 75 int h = 0; | |
| 76 try { | |
| 77 if (img == null) { | |
| 78 h = reader.getHeight(0); | |
| 79 } else { | |
| 80 h = img.getHeight(); | |
| 81 } | |
| 82 } catch (IOException e) { | |
| 83 e.printStackTrace(); | |
| 84 } | |
| 85 return h; | |
| 86 } | |
| 87 | |
| 88 public int getWidth() { | |
| 89 int w = 0; | |
| 90 try { | |
| 91 if (img == null) { | |
| 92 w = reader.getWidth(0); | |
| 93 } else { | |
| 94 w = img.getWidth(); | |
| 95 } | |
| 96 } catch (IOException e) { | |
| 97 e.printStackTrace(); | |
| 98 } | |
| 99 return w; | |
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100 } |
| 1 | 101 |
| 86 | 102 /* load image file */ |
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103 public void loadImage(File f) throws FileOpException { |
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104 util.dprintln(10, "loadImage!"); |
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105 System.gc(); |
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106 try { |
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107 img = ImageIO.read(f); |
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108 if (img == null) { |
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109 util.dprintln(3, "ERROR(loadImage): unable to load file"); |
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110 throw new FileOpException("Unable to load File!"); |
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111 } |
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112 } catch (IOException e) { |
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113 throw new FileOpException("Error reading image."); |
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114 } |
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115 } |
| 1 | 116 |
| 86 | 117 /** Get an ImageReader for the image file. |
| 118 * | |
| 119 */ | |
| 89 | 120 public void preloadImage(File f) throws IOException { |
| 85 | 121 System.gc(); |
| 89 | 122 RandomAccessFile rf = new RandomAccessFile(f, "r"); |
| 123 ImageInputStream istream = ImageIO.createImageInputStream(rf); | |
| 124 Iterator readers = ImageIO.getImageReaders(istream); | |
| 125 reader = (ImageReader) readers.next(); | |
| 126 reader.setInput(istream); | |
| 85 | 127 if (reader == null) { |
| 128 util.dprintln(3, "ERROR(loadImage): unable to load file"); | |
| 129 throw new FileOpException("Unable to load File!"); | |
| 130 } | |
| 86 | 131 imgFile = f; |
| 85 | 132 } |
| 133 | |
| 134 /* Load an image file into the Object. */ | |
| 135 public void loadSubimage(File f, Rectangle region, int prescale) | |
| 136 throws FileOpException { | |
| 137 System.gc(); | |
| 138 try { | |
| 86 | 139 if ((reader == null) || (imgFile != f)) { |
| 85 | 140 preloadImage(f); |
| 141 } | |
| 142 // set up reader parameters | |
| 143 ImageReadParam readParam = reader.getDefaultReadParam(); | |
| 144 readParam.setSourceRegion(region); | |
| 145 readParam.setSourceSubsampling(prescale, prescale, 0, 0); | |
| 146 // read image | |
| 147 img = reader.read(0, readParam); | |
| 148 } catch (IOException e) { | |
| 149 util.dprintln(3, "ERROR(loadImage): unable to load file"); | |
| 150 throw new FileOpException("Unable to load File!"); | |
| 151 } | |
| 152 if (img == null) { | |
| 153 util.dprintln(3, "ERROR(loadImage): unable to load file"); | |
| 154 throw new FileOpException("Unable to load File!"); | |
| 155 } | |
| 156 } | |
| 157 | |
| 86 | 158 /* write image of type mt to Stream */ |
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159 public void writeImage(String mt, OutputStream ostream) |
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160 throws FileOpException { |
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161 util.dprintln(10, "writeImage!"); |
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162 try { |
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163 // setup output |
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164 String type = "png"; |
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165 if (mt == "image/jpeg") { |
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166 type = "jpeg"; |
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167 } else if (mt == "image/png") { |
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168 type = "png"; |
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169 } else { |
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170 // unknown mime type |
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171 util.dprintln(2, "ERROR(writeImage): Unknown mime type " + mt); |
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172 throw new FileOpException("Unknown mime type: " + mt); |
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173 } |
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174 // render output |
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175 if (ImageIO.write(img, type, ostream)) { |
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176 // writing was OK |
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177 return; |
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178 } else { |
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179 throw new FileOpException("Error writing image: Unknown image format!"); |
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180 } |
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181 } catch (IOException e) { |
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182 // e.printStackTrace(); |
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183 throw new FileOpException("Error writing image."); |
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184 } |
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185 } |
| 1 | 186 |
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187 public void scale(double scale) throws ImageOpException { |
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188 // setup scale |
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189 AffineTransformOp scaleOp = |
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190 new AffineTransformOp( |
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191 AffineTransform.getScaleInstance(scale, scale), |
| 85 | 192 interpol); |
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193 BufferedImage scaledImg = scaleOp.filter(img, null); |
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194 |
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195 if (scaledImg == null) { |
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196 util.dprintln(2, "ERROR(cropAndScale): error in scale"); |
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197 throw new ImageOpException("Unable to scale"); |
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198 } |
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199 img = scaledImg; |
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200 } |
| 1 | 201 |
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202 public void crop(int x_off, int y_off, int width, int height) |
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203 throws ImageOpException { |
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204 // setup Crop |
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205 BufferedImage croppedImg = img.getSubimage(x_off, y_off, width, height); |
| 1 | 206 |
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207 util.dprintln( |
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208 3, |
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209 "CROP:" + croppedImg.getWidth() + "x" + croppedImg.getHeight()); |
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210 //DEBUG |
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211 // util.dprintln(2, " time "+(System.currentTimeMillis()-startTime)+"ms"); |
| 1 | 212 |
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213 if (croppedImg == null) { |
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214 util.dprintln(2, "ERROR(cropAndScale): error in crop"); |
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215 throw new ImageOpException("Unable to crop"); |
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216 } |
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217 img = croppedImg; |
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218 } |
| 1 | 219 |
| 86 | 220 public void enhance(float mult, float add) throws ImageOpException { |
| 221 /* Only one constant should work regardless of the number of bands | |
| 222 * according to the JDK spec. | |
| 223 * Doesn't work on JDK 1.4 for OSX and Linux (at least). | |
| 85 | 224 */ |
| 86 | 225 /* RescaleOp scaleOp = |
| 226 new RescaleOp( | |
| 227 (float)mult, (float)add, | |
| 228 null); | |
| 229 scaleOp.filter(img, img); | |
| 230 */ | |
| 231 /* The number of constants must match the number of bands in the image. | |
| 232 */ | |
| 233 int ncol = img.getColorModel().getNumColorComponents(); | |
| 234 float[] dm = new float[ncol]; | |
| 235 float[] da = new float[ncol]; | |
| 236 for (int i = 0; i < ncol; i++) { | |
| 237 dm[i] = (float) mult; | |
| 238 da[i] = (float) add; | |
| 85 | 239 } |
| 86 | 240 RescaleOp scaleOp = new RescaleOp(dm, da, null); |
| 85 | 241 scaleOp.filter(img, img); |
| 242 | |
| 243 } | |
| 244 | |
| 86 | 245 public void enhanceRGB(float[] rgbm, float[] rgba) |
| 246 throws ImageOpException { | |
| 247 /* The number of constants must match the number of bands in the image. | |
| 248 * We do only 3 (RGB) bands. | |
| 249 */ | |
| 250 int ncol = img.getColorModel().getNumColorComponents(); | |
| 251 if ((ncol != 3) || (rgbm.length != 3) || (rgba.length != 3)) { | |
| 252 util.dprintln( | |
| 253 2, | |
| 254 "ERROR(enhance): unknown number of color bands or coefficients (" | |
| 255 + ncol | |
| 256 + ")"); | |
| 257 return; | |
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258 } |
| 89 | 259 RescaleOp scaleOp = |
| 260 new RescaleOp(rgbOrdered(rgbm), rgbOrdered(rgba), null); | |
| 86 | 261 scaleOp.filter(img, img); |
| 262 } | |
| 263 | |
| 264 /** Ensures that the array f is in the right order to map the images RGB components. | |
| 265 */ | |
| 266 public float[] rgbOrdered(float[] fa) { | |
| 267 float[] fb = new float[3]; | |
| 268 int t = img.getType(); | |
| 269 if ((t == BufferedImage.TYPE_3BYTE_BGR) | |
| 270 || (t == BufferedImage.TYPE_4BYTE_ABGR) | |
| 271 || (t == BufferedImage.TYPE_4BYTE_ABGR_PRE)) { | |
| 272 // BGR Type (actually it looks like RBG...) | |
| 273 fb[0] = fa[0]; | |
| 274 fb[1] = fa[2]; | |
| 275 fb[2] = fa[1]; | |
| 276 } else { | |
| 277 fb = fa; | |
| 278 } | |
| 279 return fb; | |
| 85 | 280 } |
| 281 | |
| 101 | 282 public void rotate(double angle) |
| 283 throws ImageOpException { | |
| 89 | 284 // setup rotation |
| 285 double rangle = Math.toRadians(angle); | |
| 101 | 286 // create offset to make shure the rotated image has no negative coordinates |
| 287 double w = img.getWidth(); | |
| 288 double h = img.getHeight(); | |
| 103 | 289 AffineTransform trafo = new AffineTransform(); |
| 290 // center of rotation | |
| 291 double x = (w / 2); | |
| 292 double y = (h / 2); | |
| 101 | 293 trafo.rotate(rangle, x, y); |
| 103 | 294 // try rotation to see how far we're out of bounds |
| 295 AffineTransformOp rotOp = new AffineTransformOp(trafo, interpol); | |
| 296 Rectangle2D rotbounds = rotOp.getBounds2D(img); | |
| 297 double xoff = rotbounds.getX(); | |
| 298 double yoff = rotbounds.getY(); | |
| 299 // move image back in line | |
| 300 trafo.preConcatenate(AffineTransform.getTranslateInstance(-xoff, -yoff)); | |
| 101 | 301 // transform image |
| 103 | 302 rotOp = new AffineTransformOp(trafo, interpol); |
| 89 | 303 BufferedImage rotImg = rotOp.filter(img, null); |
| 101 | 304 // calculate new bounding box |
| 103 | 305 //Rectangle2D bounds = rotOp.getBounds2D(img); |
| 86 | 306 |
| 89 | 307 if (rotImg == null) { |
| 308 util.dprintln(2, "ERROR: error in rotate"); | |
| 309 throw new ImageOpException("Unable to rotate"); | |
| 310 } | |
| 103 | 311 img = rotImg; |
| 101 | 312 // crop new image (with self-made rounding) |
| 103 | 313 /* img = |
| 101 | 314 rotImg.getSubimage( |
| 315 (int) (bounds.getX()+0.5), | |
| 316 (int) (bounds.getY()+0.5), | |
| 317 (int) (bounds.getWidth()+0.5), | |
| 318 (int) (bounds.getHeight()+0.5)); | |
| 103 | 319 */ |
| 86 | 320 } |
| 85 | 321 |
| 89 | 322 public void mirror(double angle) throws ImageOpException { |
| 323 // setup mirror | |
| 324 double mx = 1; | |
| 325 double my = 1; | |
| 326 double tx = 0; | |
| 327 double ty = 0; | |
| 328 if (Math.abs(angle - 0) < epsilon) { | |
| 329 // 0 degree | |
| 330 mx = -1; | |
| 331 tx = getWidth(); | |
| 332 } else if (Math.abs(angle - 90) < epsilon) { | |
| 333 // 90 degree | |
| 334 my = -1; | |
| 335 ty = getHeight(); | |
| 336 } else if (Math.abs(angle - 180) < epsilon) { | |
| 337 // 180 degree | |
| 338 mx = -1; | |
| 339 tx = getWidth(); | |
| 340 } else if (Math.abs(angle - 270) < epsilon) { | |
| 341 // 270 degree | |
| 342 my = -1; | |
| 343 ty = getHeight(); | |
| 344 } else if (Math.abs(angle - 360) < epsilon) { | |
| 345 // 360 degree | |
| 346 mx = -1; | |
| 347 tx = getWidth(); | |
| 348 } | |
| 349 AffineTransformOp mirOp = | |
| 350 new AffineTransformOp( | |
| 351 new AffineTransform(mx, 0, 0, my, tx, ty), | |
| 352 interpol); | |
| 353 BufferedImage mirImg = mirOp.filter(img, null); | |
| 354 | |
| 355 if (mirImg == null) { | |
| 356 util.dprintln(2, "ERROR: error in mirror"); | |
| 357 throw new ImageOpException("Unable to mirror"); | |
| 358 } | |
| 359 img = mirImg; | |
|
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changeset
|
360 } |
| 86 | 361 |
| 89 | 362 /* check image size and type and store in DocuFile f */ |
| 363 public boolean checkFile(DocuFile f) throws IOException { | |
| 364 // see if f is already loaded | |
| 365 if ((reader == null) || (imgFile != f.getFile())) { | |
| 366 preloadImage(f.getFile()); | |
| 367 } | |
| 368 Dimension d = new Dimension(); | |
| 369 d.setSize(reader.getWidth(0), reader.getHeight(0)); | |
| 370 f.setSize(d); | |
| 371 String t = reader.getFormatName(); | |
| 372 t = FileOps.mimeForFile(f.getFile()); | |
| 373 f.setMimetype(t); | |
| 374 f.setChecked(true); | |
| 375 return true; | |
| 86 | 376 } |
| 1 | 377 |
| 378 } |