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			756 lines
		
	
	
		
			26 KiB
		
	
	
	
		
			Java
		
	
	
	
			
		
		
	
	
			756 lines
		
	
	
		
			26 KiB
		
	
	
	
		
			Java
		
	
	
	
| /* Copyright (C) 2000, 2002, 2006,  Free Software Foundation
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| 
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| This file is part of GNU Classpath.
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| 
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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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| 
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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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| 
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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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| 
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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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| 
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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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| 
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| package java.awt.image;
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| 
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| import java.util.Arrays;
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| 
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| /**
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|  * ComponentSampleModel supports a flexible organization of pixel samples in
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|  * memory, permitting pixel samples to be interleaved by band, by scanline,
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|  * and by pixel.
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|  *
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|  * A DataBuffer for this sample model has K banks of data.  Pixels have N
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|  * samples, so there are N bands in the DataBuffer.  Each band is completely
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|  * contained in one bank of data, but a bank may contain more than one band.
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|  * Each pixel sample is stored in a single data element.
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|  *
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|  * Within a bank, each band begins at an offset stored in bandOffsets.  The
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|  * banks containing the band is given by bankIndices.  Within the bank, there
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|  * are three dimensions - band, pixel, and scanline.  The dimension ordering
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|  * is controlled by bandOffset, pixelStride, and scanlineStride, which means
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|  * that any combination of interleavings is supported.
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|  *
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|  * @author Rolf W. Rasmussen (rolfwr@ii.uib.no)
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|  */
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| public class ComponentSampleModel extends SampleModel
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| {
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|   /** The offsets to the first sample for each band. */
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|   protected int[] bandOffsets;
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| 
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|   /** The indices of the bank used to store each band in a data buffer. */
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|   protected int[] bankIndices;
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| 
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|   /**
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|    * The number of bands in the image.
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|    * @specnote This field shadows the protected numBands in SampleModel.
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|    */
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|   protected int numBands;
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| 
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|   /** Used when creating data buffers. */
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|   protected int numBanks;
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| 
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|   /**
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|    * The number of data elements between a sample in one row and the
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|    * corresponding sample in the next row.
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|    */
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|   protected int scanlineStride;
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| 
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|   /**
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|    * The number of data elements between a sample for one pixel and the
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|    * corresponding sample for the next pixel in the same row.
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|    */
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|   protected int pixelStride;
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| 
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|   /**
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|    * Creates a new sample model that assumes that all bands are stored in a
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|    * single bank of the {@link DataBuffer}.
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|    * <p>
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|    * Note that the <code>bandOffsets</code> array is copied to internal storage
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|    * to prevent subsequent changes to the array from affecting this object.
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|    *
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|    * @param dataType  the data type (one of {@link DataBuffer#TYPE_BYTE},
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|    *   {@link DataBuffer#TYPE_USHORT}, {@link DataBuffer#TYPE_SHORT},
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|    *   {@link DataBuffer#TYPE_INT}, {@link DataBuffer#TYPE_FLOAT} or
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|    *   {@link DataBuffer#TYPE_DOUBLE}).
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|    * @param w  the width in pixels.
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|    * @param h  the height in pixels.
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|    * @param pixelStride  the number of data elements in the step from a sample
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|    *   in one pixel to the corresponding sample in the next pixel.
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|    * @param scanlineStride  the number of data elements in the step from a
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|    *   sample in a pixel to the corresponding sample in the pixel in the next
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|    *   row.
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|    * @param bandOffsets  the offset to the first element for each band, with
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|    *   the size of the array defining the number of bands (<code>null</code>
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|    *   not permitted).
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|    *
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|    * @throws IllegalArgumentException if <code>dataType</code> is not one of
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|    *   the specified values.
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|    * @throws IllegalArgumentException if <code>w</code> is less than or equal
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|    *   to zero.
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|    * @throws IllegalArgumentException if <code>h</code> is less than or equal
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|    *   to zero.
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|    * @throws IllegalArgumentException if <code>w * h</code> exceeds
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|    *   {@link Integer#MAX_VALUE}.
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|    * @throws IllegalArgumentException if <code>pixelStride</code> is negative.
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|    * @throws IllegalArgumentException if <code>scanlineStride</code> is less
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|    *   than or equal to zero.
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|    * @throws IllegalArgumentException if <code>bandOffsets</code> has zero
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|    *   length.
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|    */
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|   public ComponentSampleModel(int dataType,
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|                               int w, int h,
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|                               int pixelStride,
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|                               int scanlineStride,
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|                               int[] bandOffsets)
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|   {
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|     this(dataType, w, h, pixelStride, scanlineStride,
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|          new int[bandOffsets.length], bandOffsets);
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|   }
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| 
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|   /**
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|    * Creates a new sample model that assumes that all bands are stored in a
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|    * single bank of the {@link DataBuffer}.
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|    *
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|    * @param dataType  the data type (one of {@link DataBuffer#TYPE_BYTE},
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|    *   {@link DataBuffer#TYPE_USHORT}, {@link DataBuffer#TYPE_SHORT},
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|    *   {@link DataBuffer#TYPE_INT}, {@link DataBuffer#TYPE_FLOAT} or
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|    *   {@link DataBuffer#TYPE_DOUBLE}).
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|    * @param w  the width in pixels.
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|    * @param h  the height in pixels.
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|    * @param pixelStride  the number of data elements in the step from a sample
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|    *   in one pixel to the corresponding sample in the next pixel.
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|    * @param scanlineStride  the number of data elements in the step from a
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|    *   sample in a pixel to the corresponding sample in the pixel in the next
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|    *   row.
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|    * @param bankIndices  the index of the bank in which each band is stored
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|    *   (<code>null</code> not permitted).  This array is copied to internal
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|    *   storage so that subsequent updates to the array do not affect the sample
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|    *   model.
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|    * @param bandOffsets  the offset to the first element for each band, with
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|    *   the size of the array defining the number of bands (<code>null</code>
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|    *   not permitted).  This array is copied to internal storage so that
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|    *   subsequent updates to the array do not affect the sample model.
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|    *
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|    * @throws IllegalArgumentException if <code>dataType</code> is not one of
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|    *   the specified values.
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|    * @throws IllegalArgumentException if <code>w</code> is less than or equal
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|    *   to zero.
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|    * @throws IllegalArgumentException if <code>h</code> is less than or equal
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|    *   to zero.
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|    * @throws IllegalArgumentException if <code>w * h</code> exceeds
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|    *   {@link Integer#MAX_VALUE}.
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|    * @throws IllegalArgumentException if <code>pixelStride</code> is negative.
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|    * @throws IllegalArgumentException if <code>scanlineStride</code> is less
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|    *   than or equal to zero.
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|    * @throws IllegalArgumentException if <code>bandOffsets</code> has zero
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|    *   length.
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|    */
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|   public ComponentSampleModel(int dataType,
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|                               int w, int h,
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|                               int pixelStride,
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|                               int scanlineStride,
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|                               int[] bankIndices,
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|                               int[] bandOffsets)
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|   {
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|     super(dataType, w, h, bandOffsets.length);
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| 
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|     // super permits DataBuffer.TYPE_UNDEFINED but this class doesn't...
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|     if (dataType == DataBuffer.TYPE_UNDEFINED)
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|       throw new IllegalArgumentException("Unsupported dataType.");
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| 
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|     if ((pixelStride < 0) || (scanlineStride < 0) || (bandOffsets.length < 1)
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|         || (bandOffsets.length != bankIndices.length))
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|       throw new IllegalArgumentException();
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| 
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|     this.bandOffsets = (int[]) bandOffsets.clone();
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|     this.bankIndices = (int[]) bankIndices.clone();
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|     this.numBands = bandOffsets.length;
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| 
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|     this.numBanks = 0;
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|     for (int b = 0; b < bankIndices.length; b++)
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|       this.numBanks = Math.max(this.numBanks, bankIndices[b] + 1);
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| 
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|     this.scanlineStride = scanlineStride;
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|     this.pixelStride = pixelStride;
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| 
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|   }
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| 
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|   /**
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|    * Creates a new sample model that is compatible with this one, but with the
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|    * specified dimensions.
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|    *
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|    * @param w  the width (must be greater than zero).
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|    * @param h  the height (must be greater than zero).
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|    *
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|    * @return A new sample model.
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|    */
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|   public SampleModel createCompatibleSampleModel(int w, int h)
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|   {
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|     return new ComponentSampleModel(dataType, w, h, pixelStride,
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|                                     scanlineStride, bankIndices,
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|                                     bandOffsets);
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|   }
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| 
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|   /**
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|    * Creates a new sample model that provides access to a subset of the bands
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|    * that this sample model supports.
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|    *
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|    * @param bands  the bands (<code>null</code> not permitted).
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|    *
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|    * @return The new sample model.
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|    */
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|   public SampleModel createSubsetSampleModel(int[] bands)
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|   {
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|     int numBands = bands.length;
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| 
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|     int[] bankIndices = new int[numBands];
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|     int[] bandOffsets = new int[numBands];
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|     for (int b = 0; b < numBands; b++)
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|       {
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|         bankIndices[b] = this.bankIndices[bands[b]];
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|         bandOffsets[b] = this.bandOffsets[bands[b]];
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|       }
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| 
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|     return new ComponentSampleModel(dataType, width, height, pixelStride,
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|                                     scanlineStride, bankIndices,
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|                                     bandOffsets);
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|   }
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| 
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|   /**
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|    * Creates a new data buffer that is compatible with this sample model.
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|    *
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|    * @return The new data buffer.
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|    */
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|   public DataBuffer createDataBuffer()
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|   {
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|     // Maybe this value should be precalculated in the constructor?
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|     int highestOffset = 0;
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|     for (int b = 0; b < numBands; b++)
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|       highestOffset = Math.max(highestOffset, bandOffsets[b]);
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|     int size = pixelStride * (width - 1) + scanlineStride * (height - 1)
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|         + highestOffset + 1;
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| 
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|     DataBuffer buffer = null;
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|     switch (getTransferType())
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|       {
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|       case DataBuffer.TYPE_BYTE:
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|         buffer = new DataBufferByte(size, numBanks);
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|         break;
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|       case DataBuffer.TYPE_SHORT:
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|         buffer = new DataBufferShort(size, numBanks);
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|         break;
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|       case DataBuffer.TYPE_USHORT:
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|         buffer = new DataBufferUShort(size, numBanks);
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|         break;
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|       case DataBuffer.TYPE_INT:
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|         buffer = new DataBufferInt(size, numBanks);
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|         break;
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|       case DataBuffer.TYPE_FLOAT:
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|         buffer = new DataBufferFloat(size, numBanks);
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|         break;
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|       case DataBuffer.TYPE_DOUBLE:
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|         buffer = new DataBufferDouble(size, numBanks);
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|         break;
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|       }
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|     return buffer;
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|   }
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| 
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|   /**
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|    * Returns the offset of the sample in band 0 for the pixel at location
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|    * <code>(x, y)</code>.  This offset can be used to read a sample value from
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|    * a {@link DataBuffer}.
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|    *
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|    * @param x  the x-coordinate.
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|    * @param y  the y-coordinate.
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|    *
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|    * @return The offset.
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|    *
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|    * @see #getOffset(int, int, int)
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|    */
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|   public int getOffset(int x, int y)
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|   {
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|     return getOffset(x, y, 0);
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|   }
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| 
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|   /**
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|    * Returns the offset of the sample in band <code>b</code> for the pixel at
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|    * location <code>(x, y)</code>.  This offset can be used to read a sample
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|    * value from a {@link DataBuffer}.
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|    *
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|    * @param x  the x-coordinate.
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|    * @param y  the y-coordinate.
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|    * @param b  the band index.
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|    *
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|    * @return The offset.
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|    */
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|   public int getOffset(int x, int y, int b)
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|   {
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|     return bandOffsets[b] + pixelStride * x + scanlineStride * y;
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|   }
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| 
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|   /**
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|    * Returns the size in bits for each sample (one per band).  For this sample
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|    * model, each band has the same sample size and this is determined by the
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|    * data type for the sample model.
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|    *
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|    * @return The sample sizes.
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|    *
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|    * @see SampleModel#getDataType()
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|    */
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|   public final int[] getSampleSize()
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|   {
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|     int size = DataBuffer.getDataTypeSize(getDataType());
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|     int[] sizes = new int[numBands];
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| 
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|     java.util.Arrays.fill(sizes, size);
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|     return sizes;
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|   }
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| 
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|   /**
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|    * Returns the size in bits for the samples in the specified band.  In this
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|    * class, the sample size is the same for every band and is determined from
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|    * the data type for the model.
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|    *
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|    * @param band  the band index (ignored here).
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|    *
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|    * @return The sample size in bits.
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|    *
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|    * @see SampleModel#getDataType()
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|    */
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|   public final int getSampleSize(int band)
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|   {
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|     return DataBuffer.getDataTypeSize(getDataType());
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|   }
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| 
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|   /**
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|    * Returns the indices of the bank(s) in the {@link DataBuffer} used to
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|    * store the samples for each band.  The returned array is a copy, so that
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|    * altering it will not impact the sample model.
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|    *
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|    * @return The bank indices.
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|    */
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|   public final int[] getBankIndices()
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|   {
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|     return (int[]) bankIndices.clone();
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|   }
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| 
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|   /**
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|    * Returns the offsets to the first sample in each band.  The returned array
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|    * is a copy, so that altering it will not impact the sample model.
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|    *
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|    * @return The offsets.
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|    */
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|   public final int[] getBandOffsets()
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|   {
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|     return (int[]) bandOffsets.clone();
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|   }
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| 
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|   /**
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|    * Returns the distance (in terms of element indices) between the sample for
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|    * one pixel and the corresponding sample for the equivalent pixel in the
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|    * next row.  This is used in the calculation of the element offset for
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|    * retrieving samples from a {@link DataBuffer}.
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|    *
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|    * @return The distance between pixel samples in consecutive rows.
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|    */
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|   public final int getScanlineStride()
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|   {
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|     return scanlineStride;
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|   }
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| 
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|   /**
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|    * Returns the distance (in terms of element indices) between the sample for
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|    * one pixel and the corresponding sample for the next pixel in a row.  This
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|    * is used in the calculation of the element offset for retrieving samples
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|    * from a {@link DataBuffer}.
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|    *
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|    * @return The distance between pixel samples in the same row.
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|    */
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|   public final int getPixelStride()
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|   {
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|     return pixelStride;
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|   }
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| 
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|   /**
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|    * Returns the number of data elements used to store the samples for one
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|    * pixel.  In this model, this is the same as the number of bands.
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|    *
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|    * @return The number of data elements used to store the samples for one
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|    *   pixel.
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|    */
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|   public final int getNumDataElements()
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|   {
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|     return numBands;
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|   }
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| 
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|   /**
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|    * Returns the samples for the pixel at location <code>(x, y)</code> in
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|    * a primitive array (the array type is determined by the data type for
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|    * this model).  The <code>obj</code> argument provides an option to supply
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|    * an existing array to hold the result, if this is <code>null</code> a new
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|    * array will be allocated.
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|    *
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|    * @param x  the x-coordinate.
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|    * @param y  the y-coordinate.
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|    * @param obj  a primitive array that, if not <code>null</code>, will be
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|    *   used to store and return the sample values.
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|    * @param data  the data buffer (<code>null</code> not permitted).
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|    *
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|    * @return An array of sample values for the specified pixel.
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|    */
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|   public Object getDataElements(int x, int y, Object obj, DataBuffer data)
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|   {
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|     int type = getTransferType();
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|     int numDataEls = getNumDataElements();
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|     int offset = y * scanlineStride + x * pixelStride;
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|     switch (type)
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|       {
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|       case DataBuffer.TYPE_BYTE:
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|         byte[] bData;
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|         if (obj == null)
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|           bData = new byte[numDataEls];
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|         else
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|           bData = (byte[]) obj;
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|         for (int i = 0; i < numDataEls; i++)
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|           {
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|             bData[i] = (byte) data.getElem(bankIndices[i],
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|                                            offset + bandOffsets[i]);
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|           }
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|         obj = bData;
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|         break;
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|       case DataBuffer.TYPE_SHORT:
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|       case DataBuffer.TYPE_USHORT:
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|         short[] sData;
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|         if (obj == null)
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|           sData = new short[numDataEls];
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|         else
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|           sData = (short[]) obj;
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|         for (int i = 0; i < numDataEls; i++)
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|           {
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|             sData[i] = (short) data.getElem(bankIndices[i],
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|                                             offset + bandOffsets[i]);
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|           }
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|         obj = sData;
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|         break;
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|       case DataBuffer.TYPE_INT:
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|         int[] iData;
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|         if (obj == null)
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|           iData = new int[numDataEls];
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|         else
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|           iData = (int[]) obj;
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|         for (int i = 0; i < numDataEls; i++)
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|           {
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|             iData[i] = data.getElem(bankIndices[i], offset + bandOffsets[i]);
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|           }
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|         obj = iData;
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|         break;
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|       case DataBuffer.TYPE_FLOAT:
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|         float[] fData;
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|         if (obj == null)
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|           fData = new float[numDataEls];
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|         else
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|           fData = (float[]) obj;
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|         for (int i = 0; i < numDataEls; i++)
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|           {
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|             fData[i] = data.getElemFloat(bankIndices[i],
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|                                          offset + bandOffsets[i]);
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|           }
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|         obj = fData;
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|         break;
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|       case DataBuffer.TYPE_DOUBLE:
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|         double[] dData;
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|         if (obj == null)
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|           dData = new double[numDataEls];
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|         else
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|           dData = (double[]) obj;
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|         for (int i = 0; i < numDataEls; i++)
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|           {
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|             dData[i] = data.getElemDouble(bankIndices[i],
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|                                           offset + bandOffsets[i]);
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|           }
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|         obj = dData;
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|         break;
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|       }
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|     return obj;
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|   }
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| 
 | |
| 
 | |
|   /**
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|    * Returns all the samples for the pixel at location <code>(x, y)</code>
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|    * stored in the specified data buffer.
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|    *
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|    * @param x  the x-coordinate.
 | |
|    * @param y  the y-coordinate.
 | |
|    * @param iArray  an array that will be populated with the sample values and
 | |
|    *   returned as the result.  The size of this array should be equal to the
 | |
|    *   number of bands in the model.  If the array is <code>null</code>, a new
 | |
|    *   array is created.
 | |
|    * @param data  the data buffer (<code>null</code> not permitted).
 | |
|    *
 | |
|    * @return The samples for the specified pixel.
 | |
|    *
 | |
|    * @see #setPixel(int, int, int[], DataBuffer)
 | |
|    */
 | |
|   public int[] getPixel(int x, int y, int[] iArray, DataBuffer data)
 | |
|   {
 | |
|     if (x < 0 || x >= width || y < 0 || y >= height)
 | |
|       throw new ArrayIndexOutOfBoundsException("Pixel (" + x + ", " + y
 | |
|                                                + ") is out of bounds.");
 | |
|     int offset = pixelStride * x + scanlineStride * y;
 | |
|     if (iArray == null)
 | |
|       iArray = new int[numBands];
 | |
|     for (int b = 0; b < numBands; b++)
 | |
|       {
 | |
|         iArray[b] = data.getElem(bankIndices[b], offset + bandOffsets[b]);
 | |
|       }
 | |
|     return iArray;
 | |
|   }
 | |
| 
 | |
|   /**
 | |
|    * Returns the samples for all the pixels in a rectangular region.
 | |
|    *
 | |
|    * @param x  the x-coordinate.
 | |
|    * @param y  the y-coordinate.
 | |
|    * @param w  the width.
 | |
|    * @param h  the height.
 | |
|    * @param iArray  an array that if non-<code>null</code> will be populated
 | |
|    *   with the sample values and returned as the result.
 | |
|    * @param data  the data buffer (<code>null</code> not permitted).
 | |
|    *
 | |
|    * @return The samples for all the pixels in the rectangle.
 | |
|    */
 | |
|   public int[] getPixels(int x, int y, int w, int h, int[] iArray,
 | |
|                          DataBuffer data)
 | |
|   {
 | |
|     int offset = pixelStride * x + scanlineStride * y;
 | |
|     if (iArray == null)
 | |
|       iArray = new int[numBands * w * h];
 | |
|     int outOffset = 0;
 | |
|     for (y = 0; y < h; y++)
 | |
|       {
 | |
|         int lineOffset = offset;
 | |
|         for (x = 0; x < w; x++)
 | |
|           {
 | |
|             for (int b = 0; b < numBands; b++)
 | |
|               {
 | |
|                 iArray[outOffset++]
 | |
|                     = data.getElem(bankIndices[b], lineOffset+bandOffsets[b]);
 | |
|               }
 | |
|             lineOffset += pixelStride;
 | |
|           }
 | |
|         offset += scanlineStride;
 | |
|       }
 | |
|     return iArray;
 | |
|   }
 | |
| 
 | |
|   /**
 | |
|    * Returns the sample for band <code>b</code> of the pixel at
 | |
|    * <code>(x, y)</code> that is stored in the specified data buffer.
 | |
|    *
 | |
|    * @param x  the x-coordinate.
 | |
|    * @param y  the y-coordinate.
 | |
|    * @param b  the band index.
 | |
|    * @param data  the data buffer (<code>null</code> not permitted).
 | |
|    *
 | |
|    * @return The sample value.
 | |
|    *
 | |
|    * @throws ArrayIndexOutOfBoundsException if <code>(x, y)</code> is outside
 | |
|    *     the bounds <code>[0, 0, width, height]</code>.
 | |
|    *
 | |
|    * @see #setSample(int, int, int, int, DataBuffer)
 | |
|    */
 | |
|   public int getSample(int x, int y, int b, DataBuffer data)
 | |
|   {
 | |
|     if (x < 0 || x >= width || y < 0 || y >= height)
 | |
|       throw new ArrayIndexOutOfBoundsException("Sample (" + x + ", " + y
 | |
|                                                + ") is out of bounds.");
 | |
|     return data.getElem(bankIndices[b], getOffset(x, y, b));
 | |
|   }
 | |
| 
 | |
|   /**
 | |
|    * Sets the samples for the pixel at location <code>(x, y)</code> from the
 | |
|    * supplied primitive array (the array type must be consistent with the data
 | |
|    * type for this model).
 | |
|    *
 | |
|    * @param x  the x-coordinate.
 | |
|    * @param y  the y-coordinate.
 | |
|    * @param obj  a primitive array containing the pixel's sample values.
 | |
|    * @param data  the data buffer (<code>null</code> not permitted).
 | |
|    *
 | |
|    * @see #setDataElements(int, int, Object, DataBuffer)
 | |
|    */
 | |
|   public void setDataElements(int x, int y, Object obj, DataBuffer data)
 | |
|   {
 | |
|     int type = getTransferType();
 | |
|     int numDataEls = getNumDataElements();
 | |
|     int offset = y * scanlineStride + x * pixelStride;
 | |
|     switch (type)
 | |
|       {
 | |
|       case DataBuffer.TYPE_BYTE:
 | |
|         byte[] bData = (byte[]) obj;
 | |
|         for (int i = 0; i < numDataEls; i++)
 | |
|           {
 | |
|             data.setElem(bankIndices[i], offset + bandOffsets[i],
 | |
|                          ((int) bData[i]) & 0xFF);
 | |
|           }
 | |
|         break;
 | |
|       case DataBuffer.TYPE_SHORT:
 | |
|       case DataBuffer.TYPE_USHORT:
 | |
|         short[] sData = (short[]) obj;
 | |
|         for (int i = 0; i < numDataEls; i++)
 | |
|           {
 | |
|             data.setElem(bankIndices[i], offset + bandOffsets[i],
 | |
|                          ((int) sData[i]) & 0xFFFF);
 | |
|           }
 | |
|         break;
 | |
|       case DataBuffer.TYPE_INT:
 | |
|         int[] iData = (int[]) obj;
 | |
|         for (int i = 0; i < numDataEls; i++)
 | |
|           {
 | |
|             data.setElem(bankIndices[i], offset + bandOffsets[i], iData[i]);
 | |
|           }
 | |
|         break;
 | |
|       case DataBuffer.TYPE_FLOAT:
 | |
|         float[] fData = (float[]) obj;
 | |
|         for (int i = 0; i < numDataEls; i++)
 | |
|           {
 | |
|             data.setElemFloat(bankIndices[i], offset + bandOffsets[i],
 | |
|                               fData[i]);
 | |
|           }
 | |
|         break;
 | |
|       case DataBuffer.TYPE_DOUBLE:
 | |
|         double[] dData = (double[]) obj;
 | |
|         for (int i = 0; i < numDataEls; i++)
 | |
|           {
 | |
|             data.setElemDouble(bankIndices[i], offset + bandOffsets[i],
 | |
|                                dData[i]);
 | |
|           }
 | |
|         break;
 | |
|       }
 | |
|   }
 | |
| 
 | |
|   /**
 | |
|    * Sets the sample values for the pixel at location <code>(x, y)</code>
 | |
|    * stored in the specified data buffer.
 | |
|    *
 | |
|    * @param x  the x-coordinate.
 | |
|    * @param y  the y-coordinate.
 | |
|    * @param iArray  the pixel sample values (<code>null</code> not permitted).
 | |
|    * @param data  the data buffer (<code>null</code> not permitted).
 | |
|    *
 | |
|    * @see #getPixel(int, int, int[], DataBuffer)
 | |
|    */
 | |
|   public void setPixel(int x, int y, int[] iArray, DataBuffer data)
 | |
|   {
 | |
|     int offset = pixelStride * x + scanlineStride * y;
 | |
|     for (int b = 0; b < numBands; b++)
 | |
|       data.setElem(bankIndices[b], offset + bandOffsets[b], iArray[b]);
 | |
|   }
 | |
| 
 | |
|   /**
 | |
|    * Sets the sample value for band <code>b</code> of the pixel at location
 | |
|    * <code>(x, y)</code> in the specified data buffer.
 | |
|    *
 | |
|    * @param x  the x-coordinate.
 | |
|    * @param y  the y-coordinate.
 | |
|    * @param b  the band index.
 | |
|    * @param s  the sample value.
 | |
|    * @param data  the data buffer (<code>null</code> not permitted).
 | |
|    *
 | |
|    * @see #getSample(int, int, int, DataBuffer)
 | |
|    */
 | |
|   public void setSample(int x, int y, int b, int s, DataBuffer data)
 | |
|   {
 | |
|     data.setElem(bankIndices[b], getOffset(x, y, b), s);
 | |
|   }
 | |
| 
 | |
|   /**
 | |
|    * Tests this sample model for equality with an arbitrary object.  Returns
 | |
|    * <code>true</code> if and only if:
 | |
|    * <ul>
 | |
|    * <li><code>obj</code> is not <code>null</code>;</li>
 | |
|    * <li><code>obj</code> is an instance of <code>ComponentSampleModel</code>;
 | |
|    *   </li>
 | |
|    * <li>both models have the same values for the <code>dataType</code>,
 | |
|    *   <code>width</code>, <code>height</code>, <code>pixelStride</code>,
 | |
|    *   <code>scanlineStride</code>, <code>bandOffsets</code> and
 | |
|    *   <code>bankIndices</code> fields.</li>
 | |
|    * </ul>
 | |
|    *
 | |
|    * @param obj  the object to test (<code>null</code> permitted).
 | |
|    *
 | |
|    * @return <code>true</code> if this sample model is equal to
 | |
|    *   <code>obj</code>, and <code>false</code> otherwise.
 | |
|    */
 | |
|   public boolean equals(Object obj)
 | |
|   {
 | |
|     if (obj == null)
 | |
|       return false;
 | |
|     if (! (obj instanceof ComponentSampleModel))
 | |
|       return false;
 | |
|     ComponentSampleModel that = (ComponentSampleModel) obj;
 | |
|     if (this.dataType != that.dataType)
 | |
|       return false;
 | |
|     if (this.width != that.width)
 | |
|       return false;
 | |
|     if (this.height != that.height)
 | |
|       return false;
 | |
|     if (this.pixelStride != that.pixelStride)
 | |
|       return false;
 | |
|     if (this.scanlineStride != that.scanlineStride)
 | |
|       return false;
 | |
|     if (! Arrays.equals(this.bandOffsets, that.bandOffsets))
 | |
|       return false;
 | |
|     if (! Arrays.equals(this.bankIndices, that.bankIndices))
 | |
|       return false;
 | |
|     // couldn't find any difference, so...
 | |
|     return true;
 | |
|   }
 | |
| 
 | |
|   /**
 | |
|    * Returns a hash code for this sample model.
 | |
|    *
 | |
|    * @return The hash code.
 | |
|    */
 | |
|   public int hashCode()
 | |
|   {
 | |
|     // this computation is based on the method described in Chapter 3
 | |
|     // of Joshua Bloch's Effective Java...
 | |
|     int result = 17;
 | |
|     result = 37 * result + dataType;
 | |
|     result = 37 * result + width;
 | |
|     result = 37 * result + height;
 | |
|     result = 37 * result + pixelStride;
 | |
|     result = 37 * result + scanlineStride;
 | |
|     for (int i = 0; i < bandOffsets.length; i++)
 | |
|       result = 37 * result + bandOffsets[i];
 | |
|     for (int i = 0; i < bankIndices.length; i++)
 | |
|       result = 37 * result + bankIndices[i];
 | |
|     return result;
 | |
|   }
 | |
| }
 |