Mercurial > hg > digilib-old
annotate servlet/src/digilib/image/ImageLoaderDocuImage.java @ 499:87d2ed21bdec Root_digilibPDF
changed generation of documentID in PDFCache
author | cmielack |
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date | Fri, 13 Feb 2009 11:08:19 +0100 |
parents | 1760b19df530 |
children | e758a49258e8 |
rev | line source |
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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 | |
496 | 22 import java.awt.Image; |
85 | 23 import java.awt.Rectangle; |
207 | 24 import java.awt.RenderingHints; |
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; | |
144 | 29 import java.awt.image.ConvolveOp; |
30 import java.awt.image.Kernel; | |
85 | 31 import java.awt.image.RescaleOp; |
73 | 32 import java.io.File; |
33 import java.io.IOException; | |
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34 import java.io.OutputStream; |
89 | 35 import java.io.RandomAccessFile; |
464 | 36 import java.util.Arrays; |
85 | 37 import java.util.Iterator; |
1 | 38 |
352 | 39 import javax.imageio.IIOImage; |
73 | 40 import javax.imageio.ImageIO; |
85 | 41 import javax.imageio.ImageReadParam; |
42 import javax.imageio.ImageReader; | |
352 | 43 import javax.imageio.ImageWriteParam; |
44 import javax.imageio.ImageWriter; | |
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; |
464 | 50 import digilib.io.FileOps; |
159 | 51 import digilib.io.ImageFile; |
464 | 52 import digilib.io.ImageFileset; |
1 | 53 |
73 | 54 /** Implementation of DocuImage using the ImageLoader API of Java 1.4 and Java2D. */ |
1 | 55 public class ImageLoaderDocuImage extends DocuImageImpl { |
279 | 56 |
86 | 57 /** image object */ |
58 protected BufferedImage img; | |
279 | 59 |
86 | 60 /** interpolation type */ |
207 | 61 protected RenderingHints renderHint; |
279 | 62 |
86 | 63 /** ImageIO image reader */ |
64 protected ImageReader reader; | |
279 | 65 |
86 | 66 /** File that was read */ |
67 protected File imgFile; | |
85 | 68 |
69 /* loadSubimage is supported. */ | |
70 public boolean isSubimageSupported() { | |
71 return true; | |
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72 } |
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73 |
85 | 74 public void setQuality(int qual) { |
75 quality = qual; | |
207 | 76 renderHint = new RenderingHints(null); |
352 | 77 // hint.put(RenderingHints.KEY_ANTIALIASING, |
279 | 78 // RenderingHints.VALUE_ANTIALIAS_OFF); |
85 | 79 // setup interpolation quality |
80 if (qual > 0) { | |
181 | 81 logger.debug("quality q1"); |
279 | 82 renderHint.put(RenderingHints.KEY_INTERPOLATION, |
83 RenderingHints.VALUE_INTERPOLATION_BICUBIC); | |
85 | 84 } else { |
181 | 85 logger.debug("quality q0"); |
279 | 86 renderHint.put(RenderingHints.KEY_INTERPOLATION, |
87 RenderingHints.VALUE_INTERPOLATION_NEAREST_NEIGHBOR); | |
85 | 88 } |
89 } | |
86 | 90 |
85 | 91 public int getHeight() { |
92 int h = 0; | |
93 try { | |
94 if (img == null) { | |
95 h = reader.getHeight(0); | |
96 } else { | |
97 h = img.getHeight(); | |
98 } | |
99 } catch (IOException e) { | |
181 | 100 logger.debug("error in getHeight", e); |
85 | 101 } |
102 return h; | |
103 } | |
104 | |
105 public int getWidth() { | |
106 int w = 0; | |
107 try { | |
108 if (img == null) { | |
109 w = reader.getWidth(0); | |
110 } else { | |
111 w = img.getWidth(); | |
112 } | |
113 } catch (IOException e) { | |
181 | 114 logger.debug("error in getHeight", e); |
85 | 115 } |
116 return w; | |
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117 } |
1 | 118 |
464 | 119 /* returns a list of supported image formats */ |
120 public Iterator getSupportedFormats() { | |
121 String[] formats = ImageIO.getReaderFormatNames(); | |
122 return Arrays.asList(formats).iterator(); | |
123 } | |
124 | |
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125 /** Check image size and type and store in ImageFile f */ |
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126 public boolean identify(ImageFile imgf) throws IOException { |
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127 // try parent method first |
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128 if (super.identify(imgf)) { |
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129 return true; |
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130 } |
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131 // fileset to store the information |
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132 ImageFileset imgfs = imgf.getParent(); |
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133 File f = imgf.getFile(); |
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134 if (f == null) { |
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135 throw new IOException("File not found!"); |
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136 } |
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137 logger.debug("identifying (ImageIO) " + f); |
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138 /* |
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139 * try ImageReader |
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140 */ |
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141 RandomAccessFile raf = new RandomAccessFile(f, "r"); |
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142 ImageInputStream istream = ImageIO.createImageInputStream(raf); |
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143 Iterator readers = ImageIO.getImageReaders(istream); |
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144 if (readers.hasNext()) { |
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145 ImageReader reader = (ImageReader) readers.next(); |
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146 /* are there more readers? */ |
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147 logger.debug("ImageIO: this reader: " + reader.getClass()); |
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148 while (readers.hasNext()) { |
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149 logger.debug("ImageIO: next reader: " |
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150 + readers.next().getClass()); |
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151 } |
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152 try { |
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153 reader.setInput(istream); |
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154 ImageSize d = new ImageSize(reader.getWidth(0), reader.getHeight(0)); |
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155 imgf.setSize(d); |
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156 //String t = reader.getFormatName(); |
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157 String t = FileOps.mimeForFile(f); |
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158 imgf.setMimetype(t); |
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159 //logger.debug(" format:"+t); |
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160 if (imgfs != null) { |
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161 imgfs.setAspect(d); |
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162 } |
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163 return true; |
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164 } finally { |
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165 // dispose the reader to free resources |
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166 reader.dispose(); |
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167 raf.close(); |
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168 } |
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169 } |
464 | 170 throw new FileOpException("ERROR: unknown image file format!"); |
462
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171 } |
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172 |
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173 |
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174 /* load image file */ |
159 | 175 public void loadImage(ImageFile f) throws FileOpException { |
279 | 176 logger.debug("loadImage " + f.getFile()); |
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177 try { |
149 | 178 img = ImageIO.read(f.getFile()); |
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179 if (img == null) { |
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180 throw new FileOpException("Unable to load File!"); |
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181 } |
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182 } catch (IOException e) { |
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183 throw new FileOpException("Error reading image."); |
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184 } |
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185 } |
1 | 186 |
279 | 187 /** |
188 * Get an ImageReader for the image file. | |
189 * | |
190 * @return | |
191 */ | |
192 public ImageReader getReader(ImageFile f) throws IOException { | |
193 logger.debug("preloadImage " + f.getFile()); | |
148 | 194 if (reader != null) { |
207 | 195 logger.debug("Reader was not null!"); |
148 | 196 // clean up old reader |
207 | 197 dispose(); |
148 | 198 } |
352 | 199 // System.gc(); |
149 | 200 RandomAccessFile rf = new RandomAccessFile(f.getFile(), "r"); |
220 | 201 ImageInputStream istream = new FileImageInputStream(rf); |
352 | 202 // Iterator readers = ImageIO.getImageReaders(istream); |
279 | 203 String mt = f.getMimetype(); |
204 logger.debug("File type:" + mt); | |
205 Iterator readers = ImageIO.getImageReadersByMIMEType(mt); | |
206 if (!readers.hasNext()) { | |
207 throw new FileOpException("Unable to load File!"); | |
208 } | |
89 | 209 reader = (ImageReader) readers.next(); |
149 | 210 /* are there more readers? */ |
207 | 211 logger.debug("ImageIO: this reader: " + reader.getClass()); |
140 | 212 while (readers.hasNext()) { |
207 | 213 logger.debug("ImageIO: next reader: " + readers.next().getClass()); |
140 | 214 } |
352 | 215 // */ |
89 | 216 reader.setInput(istream); |
149 | 217 imgFile = f.getFile(); |
279 | 218 return reader; |
85 | 219 } |
220 | |
221 /* Load an image file into the Object. */ | |
159 | 222 public void loadSubimage(ImageFile f, Rectangle region, int prescale) |
279 | 223 throws FileOpException { |
207 | 224 logger.debug("loadSubimage"); |
352 | 225 // System.gc(); |
85 | 226 try { |
149 | 227 if ((reader == null) || (imgFile != f.getFile())) { |
279 | 228 getReader(f); |
85 | 229 } |
230 // set up reader parameters | |
231 ImageReadParam readParam = reader.getDefaultReadParam(); | |
232 readParam.setSourceRegion(region); | |
220 | 233 if (prescale > 1) { |
234 readParam.setSourceSubsampling(prescale, prescale, 0, 0); | |
235 } | |
85 | 236 // read image |
207 | 237 logger.debug("loading.."); |
85 | 238 img = reader.read(0, readParam); |
207 | 239 logger.debug("loaded"); |
85 | 240 } catch (IOException e) { |
241 throw new FileOpException("Unable to load File!"); | |
242 } | |
243 if (img == null) { | |
244 throw new FileOpException("Unable to load File!"); | |
245 } | |
246 } | |
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247 |
86 | 248 /* write image of type mt to Stream */ |
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249 public void writeImage(String mt, OutputStream ostream) |
279 | 250 throws FileOpException { |
207 | 251 logger.debug("writeImage"); |
353 | 252 // setup output |
253 ImageWriter writer = null; | |
254 ImageOutputStream imgout = null; | |
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255 try { |
353 | 256 imgout = ImageIO.createImageOutputStream(ostream); |
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257 if (mt == "image/jpeg") { |
352 | 258 /* |
259 * JPEG doesn't do transparency so we have to convert any RGBA | |
260 * image to RGB :-( *Java2D BUG* | |
261 */ | |
262 if (img.getColorModel().hasAlpha()) { | |
263 logger.debug("BARF: JPEG with transparency!!"); | |
264 int w = img.getWidth(); | |
265 int h = img.getHeight(); | |
266 // BufferedImage.TYPE_INT_RGB seems to be fastest (JDK1.4.1, | |
267 // OSX) | |
268 int destType = BufferedImage.TYPE_INT_RGB; | |
269 BufferedImage img2 = new BufferedImage(w, h, destType); | |
270 img2.createGraphics().drawImage(img, null, 0, 0); | |
271 img = img2; | |
272 } | |
273 writer = (ImageWriter) ImageIO.getImageWritersByFormatName( | |
274 "jpeg").next(); | |
275 if (writer == null) { | |
276 throw new FileOpException("Unable to get JPEG writer"); | |
277 } | |
278 ImageWriteParam param = writer.getDefaultWriteParam(); | |
279 if (quality > 1) { | |
280 // change JPEG compression quality | |
353 | 281 param.setCompressionMode(ImageWriteParam.MODE_EXPLICIT); |
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282 //logger.debug("JPEG qual before: " |
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283 // + Float.toString(param.getCompressionQuality())); |
352 | 284 param.setCompressionQuality(0.9f); |
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285 //logger.debug("JPEG qual now: " |
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286 // + Float.toString(param.getCompressionQuality())); |
352 | 287 } |
288 writer.setOutput(imgout); | |
289 // render output | |
290 logger.debug("writing"); | |
291 writer.write(null, new IIOImage(img, null, null), param); | |
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292 } else if (mt == "image/png") { |
352 | 293 // render output |
294 writer = (ImageWriter) ImageIO.getImageWritersByFormatName( | |
295 "png").next(); | |
296 if (writer == null) { | |
297 throw new FileOpException("Unable to get PNG writer"); | |
298 } | |
299 writer.setOutput(imgout); | |
300 logger.debug("writing"); | |
301 writer.write(img); | |
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302 } else { |
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303 // unknown mime type |
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304 throw new FileOpException("Unknown mime type: " + mt); |
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305 } |
140 | 306 |
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307 } catch (IOException e) { |
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308 throw new FileOpException("Error writing image."); |
353 | 309 } finally { |
310 // clean up | |
311 if (writer != null) { | |
312 writer.dispose(); | |
313 } | |
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314 } |
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315 } |
1 | 316 |
149 | 317 public void scale(double scale, double scaleY) throws ImageOpException { |
207 | 318 logger.debug("scale"); |
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319 /* for downscaling in high quality the image is blurred first */ |
144 | 320 if ((scale <= 0.5) && (quality > 1)) { |
321 int bl = (int) Math.floor(1 / scale); | |
322 blur(bl); | |
323 } | |
207 | 324 /* then scaled */ |
279 | 325 AffineTransformOp scaleOp = new AffineTransformOp(AffineTransform |
326 .getScaleInstance(scale, scale), renderHint); | |
144 | 327 BufferedImage scaledImg = null; |
207 | 328 // enforce destination image type (*Java2D BUG*) |
220 | 329 int type = img.getType(); |
330 // FIXME: which type would be best? | |
279 | 331 if ((quality > 0) && (type != 0)) { |
207 | 332 logger.debug("creating destination image"); |
144 | 333 Rectangle2D dstBounds = scaleOp.getBounds2D(img); |
279 | 334 scaledImg = new BufferedImage((int) dstBounds.getWidth(), |
335 (int) dstBounds.getHeight(), type); | |
144 | 336 } |
207 | 337 logger.debug("scaling..."); |
144 | 338 scaledImg = scaleOp.filter(img, scaledImg); |
207 | 339 if (scaledImg == null) { |
340 throw new ImageOpException("Unable to scale"); | |
341 } | |
352 | 342 // DEBUG |
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343 logger.debug("destination image type " + scaledImg.getType()); |
279 | 344 logger.debug("SCALE: " + scale + " ->" + scaledImg.getWidth() + "x" |
144 | 345 + scaledImg.getHeight()); |
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346 img = scaledImg; |
207 | 347 scaledImg = null; |
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348 } |
1 | 349 |
144 | 350 public void blur(int radius) throws ImageOpException { |
352 | 351 // DEBUG |
181 | 352 logger.debug("blur: " + radius); |
144 | 353 // minimum radius is 2 |
354 int klen = Math.max(radius, 2); | |
220 | 355 // FIXME: use constant kernels for most common sizes |
144 | 356 int ksize = klen * klen; |
357 // kernel is constant 1/k | |
358 float f = 1f / ksize; | |
359 float[] kern = new float[ksize]; | |
360 for (int i = 0; i < ksize; i++) { | |
361 kern[i] = f; | |
362 } | |
363 Kernel blur = new Kernel(klen, klen, kern); | |
364 // blur with convolve operation | |
279 | 365 ConvolveOp blurOp = new ConvolveOp(blur, ConvolveOp.EDGE_NO_OP, |
366 renderHint); | |
145 | 367 // blur needs explicit destination image type for color *Java2D BUG* |
368 BufferedImage blurredImg = null; | |
369 if (img.getType() == BufferedImage.TYPE_3BYTE_BGR) { | |
279 | 370 blurredImg = new BufferedImage(img.getWidth(), img.getHeight(), img |
371 .getType()); | |
145 | 372 } |
373 blurredImg = blurOp.filter(img, blurredImg); | |
144 | 374 if (blurredImg == null) { |
375 throw new ImageOpException("Unable to scale"); | |
376 } | |
377 img = blurredImg; | |
378 } | |
379 | |
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380 public void crop(int x_off, int y_off, int width, int height) |
279 | 381 throws ImageOpException { |
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382 // setup Crop |
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383 BufferedImage croppedImg = img.getSubimage(x_off, y_off, width, height); |
352 | 384 // DEBUG |
385 // util.dprintln(2, " time | |
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386 // "+(System.currentTimeMillis()-startTime)+"ms"); |
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387 if (croppedImg == null) { |
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388 throw new ImageOpException("Unable to crop"); |
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389 } |
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390 logger.debug("CROP:" + croppedImg.getWidth() + "x" |
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391 + croppedImg.getHeight()); |
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392 img = croppedImg; |
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393 } |
1 | 394 |
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395 public void enhance(float mult, float add) throws ImageOpException { |
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396 /* |
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397 * Only one constant should work regardless of the number of bands |
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398 * according to the JDK spec. Doesn't work on JDK 1.4 for OSX and Linux |
279 | 399 * (at least). RescaleOp scaleOp = new RescaleOp( (float)mult, |
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400 * (float)add, null); scaleOp.filter(img, img); |
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401 */ |
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402 |
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403 /* The number of constants must match the number of bands in the image. */ |
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404 int ncol = img.getColorModel().getNumComponents(); |
86 | 405 float[] dm = new float[ncol]; |
406 float[] da = new float[ncol]; | |
407 for (int i = 0; i < ncol; i++) { | |
408 dm[i] = (float) mult; | |
409 da[i] = (float) add; | |
85 | 410 } |
86 | 411 RescaleOp scaleOp = new RescaleOp(dm, da, null); |
85 | 412 scaleOp.filter(img, img); |
413 } | |
414 | |
279 | 415 public void enhanceRGB(float[] rgbm, float[] rgba) throws ImageOpException { |
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416 |
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417 /* |
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418 * The number of constants must match the number of bands in the image. |
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419 * We do only 3 (RGB) bands. |
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420 */ |
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421 |
86 | 422 int ncol = img.getColorModel().getNumColorComponents(); |
423 if ((ncol != 3) || (rgbm.length != 3) || (rgba.length != 3)) { | |
279 | 424 logger |
425 .debug("ERROR(enhance): unknown number of color bands or coefficients (" | |
426 + ncol + ")"); | |
86 | 427 return; |
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428 } |
279 | 429 RescaleOp scaleOp = new RescaleOp(rgbOrdered(rgbm), rgbOrdered(rgba), |
430 null); | |
86 | 431 scaleOp.filter(img, img); |
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432 } |
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433 |
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434 /** |
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435 * Ensures that the array f is in the right order to map the images RGB |
279 | 436 * components. (not shure what happens |
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437 */ |
86 | 438 public float[] rgbOrdered(float[] fa) { |
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439 /* |
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440 * TODO: this is UGLY, UGLY!! |
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441 */ |
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442 float[] fb; |
86 | 443 int t = img.getType(); |
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444 if (img.getColorModel().hasAlpha()) { |
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445 fb = new float[4]; |
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446 if ((t == BufferedImage.TYPE_INT_ARGB) |
279 | 447 || (t == BufferedImage.TYPE_INT_ARGB_PRE)) { |
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448 // RGB Type |
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449 fb[0] = fa[0]; |
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450 fb[1] = fa[1]; |
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451 fb[2] = fa[2]; |
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452 fb[3] = 1f; |
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453 } else { |
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454 // this isn't tested :-( |
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455 fb[0] = 1f; |
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456 fb[1] = fa[0]; |
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457 fb[2] = fa[1]; |
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458 fb[3] = fa[2]; |
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459 } |
86 | 460 } else { |
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461 fb = new float[3]; |
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462 if (t == BufferedImage.TYPE_3BYTE_BGR) { |
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463 // BGR Type (actually it looks like RBG...) |
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464 fb[0] = fa[0]; |
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465 fb[1] = fa[2]; |
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466 fb[2] = fa[1]; |
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467 } else { |
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468 fb[0] = fa[0]; |
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469 fb[1] = fa[1]; |
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470 fb[2] = fa[2]; |
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471 } |
86 | 472 } |
473 return fb; | |
85 | 474 } |
475 | |
140 | 476 public void rotate(double angle) throws ImageOpException { |
89 | 477 // setup rotation |
478 double rangle = Math.toRadians(angle); | |
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479 // create offset to make shure the rotated image has no negative |
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480 // coordinates |
101 | 481 double w = img.getWidth(); |
482 double h = img.getHeight(); | |
103 | 483 AffineTransform trafo = new AffineTransform(); |
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484 // center of rotation |
103 | 485 double x = (w / 2); |
486 double y = (h / 2); | |
101 | 487 trafo.rotate(rangle, x, y); |
103 | 488 // try rotation to see how far we're out of bounds |
207 | 489 AffineTransformOp rotOp = new AffineTransformOp(trafo, renderHint); |
103 | 490 Rectangle2D rotbounds = rotOp.getBounds2D(img); |
491 double xoff = rotbounds.getX(); | |
492 double yoff = rotbounds.getY(); | |
493 // move image back in line | |
279 | 494 trafo |
495 .preConcatenate(AffineTransform.getTranslateInstance(-xoff, | |
496 -yoff)); | |
101 | 497 // transform image |
207 | 498 rotOp = new AffineTransformOp(trafo, renderHint); |
89 | 499 BufferedImage rotImg = rotOp.filter(img, null); |
101 | 500 // calculate new bounding box |
352 | 501 // Rectangle2D bounds = rotOp.getBounds2D(img); |
89 | 502 if (rotImg == null) { |
503 throw new ImageOpException("Unable to rotate"); | |
504 } | |
103 | 505 img = rotImg; |
101 | 506 // crop new image (with self-made rounding) |
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507 /* |
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508 * img = rotImg.getSubimage( (int) (bounds.getX()+0.5), (int) |
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509 * (bounds.getY()+0.5), (int) (bounds.getWidth()+0.5), (int) |
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510 * (bounds.getHeight()+0.5)); |
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511 */ |
86 | 512 } |
85 | 513 |
89 | 514 public void mirror(double angle) throws ImageOpException { |
515 // setup mirror | |
516 double mx = 1; | |
517 double my = 1; | |
518 double tx = 0; | |
519 double ty = 0; | |
144 | 520 if (Math.abs(angle - 0) < epsilon) { // 0 degree |
89 | 521 mx = -1; |
522 tx = getWidth(); | |
144 | 523 } else if (Math.abs(angle - 90) < epsilon) { // 90 degree |
89 | 524 my = -1; |
525 ty = getHeight(); | |
144 | 526 } else if (Math.abs(angle - 180) < epsilon) { // 180 degree |
89 | 527 mx = -1; |
528 tx = getWidth(); | |
144 | 529 } else if (Math.abs(angle - 270) < epsilon) { // 270 degree |
89 | 530 my = -1; |
531 ty = getHeight(); | |
144 | 532 } else if (Math.abs(angle - 360) < epsilon) { // 360 degree |
89 | 533 mx = -1; |
534 tx = getWidth(); | |
535 } | |
279 | 536 AffineTransformOp mirOp = new AffineTransformOp(new AffineTransform(mx, |
537 0, 0, my, tx, ty), renderHint); | |
89 | 538 BufferedImage mirImg = mirOp.filter(img, null); |
539 if (mirImg == null) { | |
540 throw new ImageOpException("Unable to mirror"); | |
541 } | |
542 img = mirImg; | |
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543 } |
86 | 544 |
279 | 545 /* |
546 * (non-Javadoc) | |
547 * | |
548 * @see java.lang.Object#finalize() | |
549 */ | |
148 | 550 protected void finalize() throws Throwable { |
207 | 551 dispose(); |
552 super.finalize(); | |
553 } | |
554 | |
555 public void dispose() { | |
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556 // we must dispose the ImageReader because it keeps the filehandle |
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557 // open! |
256 | 558 if (reader != null) { |
559 reader.dispose(); | |
560 reader = null; | |
561 } | |
148 | 562 img = null; |
563 } | |
564 | |
496 | 565 public Image getImage(){ |
566 return (Image) img; | |
567 } | |
568 | |
569 | |
1 | 570 } |