Source for java.awt.image.PixelInterleavedSampleModel

   1: /* PixelInterleavedSampleModel.java
   2:    Copyright (C) 2004, 2005  Free Software Foundation, Inc.
   3: 
   4: This file is part of GNU Classpath.
   5: 
   6: GNU Classpath is free software; you can redistribute it and/or modify
   7: it under the terms of the GNU General Public License as published by
   8: the Free Software Foundation; either version 2, or (at your option)
   9: any later version.
  10: 
  11: GNU Classpath is distributed in the hope that it will be useful, but
  12: WITHOUT ANY WARRANTY; without even the implied warranty of
  13: MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
  14: General Public License for more details.
  15: 
  16: You should have received a copy of the GNU General Public License
  17: along with GNU Classpath; see the file COPYING.  If not, write to the
  18: Free Software Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA
  19: 02110-1301 USA.
  20: 
  21: Linking this library statically or dynamically with other modules is
  22: making a combined work based on this library.  Thus, the terms and
  23: conditions of the GNU General Public License cover the whole
  24: combination.
  25: 
  26: As a special exception, the copyright holders of this library give you
  27: permission to link this library with independent modules to produce an
  28: executable, regardless of the license terms of these independent
  29: modules, and to copy and distribute the resulting executable under
  30: terms of your choice, provided that you also meet, for each linked
  31: independent module, the terms and conditions of the license of that
  32: module.  An independent module is a module which is not derived from
  33: or based on this library.  If you modify this library, you may extend
  34: this exception to your version of the library, but you are not
  35: obligated to do so.  If you do not wish to do so, delete this
  36: exception statement from your version. */
  37: 
  38: package java.awt.image;
  39: 
  40: 
  41: /**
  42:  * A <code>SampleModel</code> that uses exactly one element of the
  43:  * raster&#x2019;s {@link DataBuffer} per pixel, holds all bands in a
  44:  * single bank, and stores band data in pixel-interleaved manner.
  45:  *
  46:  * @since 1.2
  47:  *
  48:  * @author Sascha Brawer (brawer@dandelis.ch)
  49:  */
  50: public class PixelInterleavedSampleModel
  51:   extends ComponentSampleModel
  52: {
  53:   public PixelInterleavedSampleModel(int dataType, int width, int height,
  54:                                      int pixelStride, int scanlineStride,
  55:                                      int[] bandOffsets)
  56:   {
  57:     super(dataType, width, height, pixelStride, scanlineStride,
  58:           bandOffsets);
  59:   }
  60: 
  61: 
  62:   /**
  63:    * Creates a new <code>SampleModel</code> that is like this one, but
  64:    * uses the specified width and height.
  65:    *
  66:    * @param width the number of pixels in the horizontal direction.
  67:    *
  68:    * @param height the number of pixels in the vertical direction.
  69:    */
  70:   public SampleModel createCompatibleSampleModel(int width, int height)
  71:   {
  72:     // Find minimum band offset.
  73:     int minBandoff = bandOffsets[0];
  74:     int numBands = bandOffsets.length;
  75:     for (int i = 1; i < numBands; i++)
  76:       {
  77:         if (bandOffsets[i] < minBandoff)
  78:           {
  79:             minBandoff = bandOffsets[i];
  80:           }
  81:       }
  82:     // Adjust band offsets so that minimum offset is at 0.
  83:     int[] bandOff;
  84:     if (minBandoff > 0)
  85:       {
  86:         bandOff = new int[numBands];
  87:         for (int i = 0; i < numBands; i++)
  88:           {
  89:             bandOff[i] = bandOffsets[i] - minBandoff;
  90:           }
  91:       }
  92:     else
  93:       {
  94:         bandOff = bandOffsets;
  95:       }
  96:     // Adjust scanline stride for new width.
  97:     return new PixelInterleavedSampleModel(dataType, width, height,
  98:                                            pixelStride, pixelStride * width,
  99:                                            bandOff);
 100:   }
 101: 
 102: 
 103:   /**
 104:    * Creates a new <code>SampleModel</code> that is like this one, but
 105:    * uses only a subset of its bands.
 106:    *
 107:    * @param bands an array whose elements indicate which bands shall
 108:    * be part of the subset. For example, <code>[0, 2, 3]</code> would
 109:    * create a SampleModel containing bands #0, #2 and #3.
 110:    */
 111:   public SampleModel createSubsetSampleModel(int[] bands)
 112:   {
 113:     int[] subOffsets;
 114: 
 115:     subOffsets = new int[bands.length];
 116:     for (int i = 0; i < bands.length; i++)
 117:       subOffsets[i] = bandOffsets[bands[i]];
 118: 
 119:     return new PixelInterleavedSampleModel(dataType, width, height,
 120:                                            pixelStride, scanlineStride,
 121:                                            subOffsets);
 122:   }
 123: }