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[/] [openrisc/] [trunk/] [gnu-dev/] [or1k-gcc/] [libjava/] [classpath/] [java/] [awt/] [image/] [ConvolveOp.java] - Blame information for rev 771

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1 771 jeremybenn
/* ConvolveOp.java --
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   Copyright (C) 2004, 2005, 2006, Free Software Foundation -- ConvolveOp
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This file is part of GNU Classpath.
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GNU Classpath is free software; you can redistribute it and/or modify
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it under the terms of the GNU General Public License as published by
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the Free Software Foundation; either version 2, or (at your option)
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any later version.
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GNU Classpath is distributed in the hope that it will be useful, but
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WITHOUT ANY WARRANTY; without even the implied warranty of
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MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
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General Public License for more details.
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You should have received a copy of the GNU General Public License
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along with GNU Classpath; see the file COPYING.  If not, write to the
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Free Software Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA
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02110-1301 USA.
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Linking this library statically or dynamically with other modules is
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making a combined work based on this library.  Thus, the terms and
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conditions of the GNU General Public License cover the whole
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combination.
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As a special exception, the copyright holders of this library give you
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permission to link this library with independent modules to produce an
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executable, regardless of the license terms of these independent
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modules, and to copy and distribute the resulting executable under
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terms of your choice, provided that you also meet, for each linked
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independent module, the terms and conditions of the license of that
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module.  An independent module is a module which is not derived from
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or based on this library.  If you modify this library, you may extend
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this exception to your version of the library, but you are not
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obligated to do so.  If you do not wish to do so, delete this
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exception statement from your version. */
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package java.awt.image;
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import java.awt.RenderingHints;
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import java.awt.geom.Point2D;
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import java.awt.geom.Rectangle2D;
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/**
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 * Convolution filter.
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 *
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 * ConvolveOp convolves the source image with a Kernel to generate a
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 * destination image.  This involves multiplying each pixel and its neighbors
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 * with elements in the kernel to compute a new pixel.
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 *
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 * Each band in a Raster is convolved and copied to the destination Raster.
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 * For BufferedImages, convolution is applied to all components.  Color
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 * conversion will be applied if needed.
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 *
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 * Note that this filter ignores whether the source or destination is alpha
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 * premultiplied.  The reference spec states that data will be premultiplied
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 * prior to convolving and divided back out afterwards (if needed), but testing
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 * has shown that this is not the case with their implementation.
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 *
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 * @author jlquinn@optonline.net
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 */
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public class ConvolveOp implements BufferedImageOp, RasterOp
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{
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  /** Edge pixels are set to 0. */
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  public static final int EDGE_ZERO_FILL = 0;
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68
  /** Edge pixels are copied from the source. */
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  public static final int EDGE_NO_OP = 1;
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  private Kernel kernel;
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  private int edge;
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  private RenderingHints hints;
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  /**
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   * Construct a ConvolveOp.
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   *
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   * The edge condition specifies that pixels outside the area that can be
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   * filtered are either set to 0 or copied from the source image.
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   *
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   * @param kernel The kernel to convolve with.
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   * @param edgeCondition Either EDGE_ZERO_FILL or EDGE_NO_OP.
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   * @param hints Rendering hints for color conversion, or null.
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   */
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  public ConvolveOp(Kernel kernel,
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                                int edgeCondition,
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                                RenderingHints hints)
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  {
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    this.kernel = kernel;
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    edge = edgeCondition;
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    this.hints = hints;
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  }
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94
  /**
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   * Construct a ConvolveOp.
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   *
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   * The edge condition defaults to EDGE_ZERO_FILL.
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   *
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   * @param kernel The kernel to convolve with.
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   */
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  public ConvolveOp(Kernel kernel)
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  {
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    this.kernel = kernel;
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    edge = EDGE_ZERO_FILL;
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    hints = null;
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  }
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108
  /**
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   * Converts the source image using the kernel specified in the
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   * constructor.  The resulting image is stored in the destination image if one
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   * is provided; otherwise a new BufferedImage is created and returned.
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   *
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   * The source and destination BufferedImage (if one is supplied) must have
114
   * the same dimensions.
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   *
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   * @param src The source image.
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   * @param dst The destination image.
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   * @throws IllegalArgumentException if the rasters and/or color spaces are
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   *            incompatible.
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   * @return The convolved image.
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   */
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  public final BufferedImage filter(BufferedImage src, BufferedImage dst)
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  {
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    if (src == dst)
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      throw new IllegalArgumentException("Source and destination images " +
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            "cannot be the same.");
127
 
128
    if (dst == null)
129
      dst = createCompatibleDestImage(src, src.getColorModel());
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131
    // Make sure source image is premultiplied
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    BufferedImage src1 = src;
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    // The spec says we should do this, but mauve testing shows that Sun's
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    // implementation does not check this.
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    /*
136
    if (!src.isAlphaPremultiplied())
137
    {
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      src1 = createCompatibleDestImage(src, src.getColorModel());
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      src.copyData(src1.getRaster());
140
      src1.coerceData(true);
141
    }
142
    */
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144
    BufferedImage dst1 = dst;
145
    if (src1.getColorModel().getColorSpace().getType() != dst.getColorModel().getColorSpace().getType())
146
      dst1 = createCompatibleDestImage(src, src.getColorModel());
147
 
148
    filter(src1.getRaster(), dst1.getRaster());
149
 
150
    // Since we don't coerceData above, we don't need to divide it back out.
151
    // This is wrong (one mauve test specifically tests converting a non-
152
    // premultiplied image to a premultiplied image, and it shows that Sun
153
    // simply ignores the premultipled flag, contrary to the spec), but we
154
    // mimic it for compatibility.
155
    /*
156
        if (! dst.isAlphaPremultiplied())
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          dst1.coerceData(false);
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    */
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160
    // Convert between color models if needed
161
    if (dst1 != dst)
162
      new ColorConvertOp(hints).filter(dst1, dst);
163
 
164
    return dst;
165
  }
166
 
167
  /**
168
   * Creates an empty BufferedImage with the size equal to the source and the
169
   * correct number of bands. The new image is created with the specified
170
   * ColorModel, or if no ColorModel is supplied, an appropriate one is chosen.
171
   *
172
   * @param src The source image.
173
   * @param dstCM A color model for the destination image (may be null).
174
   * @return The new compatible destination image.
175
   */
176
  public BufferedImage createCompatibleDestImage(BufferedImage src,
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                                                 ColorModel dstCM)
178
  {
179
    if (dstCM != null)
180
      return new BufferedImage(dstCM,
181
                               src.getRaster().createCompatibleWritableRaster(),
182
                               src.isAlphaPremultiplied(), null);
183
 
184
    return new BufferedImage(src.getWidth(), src.getHeight(), src.getType());
185
  }
186
 
187
  /* (non-Javadoc)
188
   * @see java.awt.image.RasterOp#getRenderingHints()
189
   */
190
  public final RenderingHints getRenderingHints()
191
  {
192
    return hints;
193
  }
194
 
195
  /**
196
   * Get the edge condition for this Op.
197
   *
198
   * @return The edge condition.
199
   */
200
  public int getEdgeCondition()
201
  {
202
    return edge;
203
  }
204
 
205
  /**
206
   * Returns (a clone of) the convolution kernel.
207
   *
208
   * @return The convolution kernel.
209
   */
210
  public final Kernel getKernel()
211
  {
212
    return (Kernel) kernel.clone();
213
  }
214
 
215
  /**
216
   * Converts the source raster using the kernel specified in the constructor.
217
   * The resulting raster is stored in the destination raster if one is
218
   * provided; otherwise a new WritableRaster is created and returned.
219
   *
220
   * If the convolved value for a sample is outside the range of [0-255], it
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   * will be clipped.
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   *
223
   * The source and destination raster (if one is supplied) cannot be the same,
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   * and must also have the same dimensions.
225
   *
226
   * @param src The source raster.
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   * @param dest The destination raster.
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   * @throws IllegalArgumentException if the rasters identical.
229
   * @throws ImagingOpException if the convolution is not possible.
230
   * @return The transformed raster.
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   */
232
  public final WritableRaster filter(Raster src, WritableRaster dest)
233
  {
234
    if (src == dest)
235
      throw new IllegalArgumentException("src == dest is not allowed.");
236
    if (kernel.getWidth() > src.getWidth()
237
        || kernel.getHeight() > src.getHeight())
238
      throw new ImagingOpException("The kernel is too large.");
239
    if (dest == null)
240
      dest = createCompatibleDestRaster(src);
241
    else if (src.getNumBands() != dest.getNumBands())
242
      throw new ImagingOpException("src and dest have different band counts.");
243
 
244
    // calculate the borders that the op can't reach...
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    int kWidth = kernel.getWidth();
246
    int kHeight = kernel.getHeight();
247
    int left = kernel.getXOrigin();
248
    int right = Math.max(kWidth - left - 1, 0);
249
    int top = kernel.getYOrigin();
250
    int bottom = Math.max(kHeight - top - 1, 0);
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252
    // Calculate max sample values for clipping
253
    int[] maxValue = src.getSampleModel().getSampleSize();
254
    for (int i = 0; i < maxValue.length; i++)
255
      maxValue[i] = (int)Math.pow(2, maxValue[i]) - 1;
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257
    // process the region that is reachable...
258
    int regionW = src.width - left - right;
259
    int regionH = src.height - top - bottom;
260
    float[] kvals = kernel.getKernelData(null);
261
    float[] tmp = new float[kWidth * kHeight];
262
 
263
    for (int x = 0; x < regionW; x++)
264
      {
265
        for (int y = 0; y < regionH; y++)
266
          {
267
            // FIXME: This needs a much more efficient implementation
268
            for (int b = 0; b < src.getNumBands(); b++)
269
            {
270
              float v = 0;
271
              src.getSamples(x, y, kWidth, kHeight, b, tmp);
272
              for (int i = 0; i < tmp.length; i++)
273
                v += tmp[tmp.length - i - 1] * kvals[i];
274
                // FIXME: in the above line, I've had to reverse the order of
275
                // the samples array to make the tests pass.  I haven't worked
276
                // out why this is necessary.
277
 
278
              // This clipping is is undocumented, but determined by testing.
279
              if (v > maxValue[b])
280
                v = maxValue[b];
281
              else if (v < 0)
282
                v = 0;
283
 
284
              dest.setSample(x + kernel.getXOrigin(), y + kernel.getYOrigin(),
285
                             b, v);
286
            }
287
          }
288
      }
289
 
290
    // fill in the top border
291
    fillEdge(src, dest, 0, 0, src.width, top, edge);
292
 
293
    // fill in the bottom border
294
    fillEdge(src, dest, 0, src.height - bottom, src.width, bottom, edge);
295
 
296
    // fill in the left border
297
    fillEdge(src, dest, 0, top, left, regionH, edge);
298
 
299
    // fill in the right border
300
    fillEdge(src, dest, src.width - right, top, right, regionH, edge);
301
 
302
    return dest;
303
  }
304
 
305
  /**
306
   * Fills a range of pixels (typically at the edge of a raster) with either
307
   * zero values (if <code>edgeOp</code> is <code>EDGE_ZERO_FILL</code>) or the
308
   * corresponding pixel values from the source raster (if <code>edgeOp</code>
309
   * is <code>EDGE_NO_OP</code>).  This utility method is called by the
310
   * {@link #fillEdge(Raster, WritableRaster, int, int, int, int, int)} method.
311
   *
312
   * @param src  the source raster.
313
   * @param dest  the destination raster.
314
   * @param x  the x-coordinate of the top left pixel in the range.
315
   * @param y  the y-coordinate of the top left pixel in the range.
316
   * @param w  the width of the pixel range.
317
   * @param h  the height of the pixel range.
318
   * @param edgeOp  indicates how to determine the values for the range
319
   *     (either {@link #EDGE_ZERO_FILL} or {@link #EDGE_NO_OP}).
320
   */
321
  private void fillEdge(Raster src, WritableRaster dest, int x, int y, int w,
322
                        int h, int edgeOp)
323
  {
324
    if (w <= 0)
325
      return;
326
    if (h <= 0)
327
      return;
328
    if (edgeOp == EDGE_ZERO_FILL)  // fill region with zeroes
329
      {
330
        float[] zeros = new float[src.getNumBands() * w * h];
331
        dest.setPixels(x, y, w, h, zeros);
332
      }
333
    else  // copy pixels from source
334
      {
335
        float[] pixels = new float[src.getNumBands() * w * h];
336
        src.getPixels(x, y, w, h, pixels);
337
        dest.setPixels(x, y, w, h, pixels);
338
      }
339
  }
340
 
341
  /* (non-Javadoc)
342
   * @see java.awt.image.RasterOp#createCompatibleDestRaster(java.awt.image.Raster)
343
   */
344
  public WritableRaster createCompatibleDestRaster(Raster src)
345
  {
346
    return src.createCompatibleWritableRaster();
347
  }
348
 
349
  /* (non-Javadoc)
350
   * @see java.awt.image.BufferedImageOp#getBounds2D(java.awt.image.BufferedImage)
351
   */
352
  public final Rectangle2D getBounds2D(BufferedImage src)
353
  {
354
    return src.getRaster().getBounds();
355
  }
356
 
357
  /* (non-Javadoc)
358
   * @see java.awt.image.RasterOp#getBounds2D(java.awt.image.Raster)
359
   */
360
  public final Rectangle2D getBounds2D(Raster src)
361
  {
362
    return src.getBounds();
363
  }
364
 
365
  /**
366
   * Returns the corresponding destination point for a source point. Because
367
   * this is not a geometric operation, the destination and source points will
368
   * be identical.
369
   *
370
   * @param src The source point.
371
   * @param dst The transformed destination point.
372
   * @return The transformed destination point.
373
   */
374
  public final Point2D getPoint2D(Point2D src, Point2D dst)
375
  {
376
    if (dst == null) return (Point2D)src.clone();
377
    dst.setLocation(src);
378
    return dst;
379
  }
380
}

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