001    /* PixelInterleavedSampleModel.java
002       Copyright (C) 2004, 2005  Free Software Foundation, Inc.
003    
004    This file is part of GNU Classpath.
005    
006    GNU Classpath is free software; you can redistribute it and/or modify
007    it under the terms of the GNU General Public License as published by
008    the Free Software Foundation; either version 2, or (at your option)
009    any later version.
010    
011    GNU Classpath is distributed in the hope that it will be useful, but
012    WITHOUT ANY WARRANTY; without even the implied warranty of
013    MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
014    General Public License for more details.
015    
016    You should have received a copy of the GNU General Public License
017    along with GNU Classpath; see the file COPYING.  If not, write to the
018    Free Software Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA
019    02110-1301 USA.
020    
021    Linking this library statically or dynamically with other modules is
022    making a combined work based on this library.  Thus, the terms and
023    conditions of the GNU General Public License cover the whole
024    combination.
025    
026    As a special exception, the copyright holders of this library give you
027    permission to link this library with independent modules to produce an
028    executable, regardless of the license terms of these independent
029    modules, and to copy and distribute the resulting executable under
030    terms of your choice, provided that you also meet, for each linked
031    independent module, the terms and conditions of the license of that
032    module.  An independent module is a module which is not derived from
033    or based on this library.  If you modify this library, you may extend
034    this exception to your version of the library, but you are not
035    obligated to do so.  If you do not wish to do so, delete this
036    exception statement from your version. */
037    
038    package java.awt.image;
039    
040    
041    /**
042     * A <code>SampleModel</code> that uses exactly one element of the
043     * raster&#x2019;s {@link DataBuffer} per pixel, holds all bands in a
044     * single bank, and stores band data in pixel-interleaved manner.
045     *
046     * @since 1.2
047     *
048     * @author Sascha Brawer (brawer@dandelis.ch)
049     */
050    public class PixelInterleavedSampleModel
051      extends ComponentSampleModel
052    {
053      public PixelInterleavedSampleModel(int dataType, int width, int height,
054                                         int pixelStride, int scanlineStride,
055                                         int[] bandOffsets)
056      {
057        super(dataType, width, height, pixelStride, scanlineStride,
058              bandOffsets);
059      }
060    
061      
062      /**
063       * Creates a new <code>SampleModel</code> that is like this one, but
064       * uses the specified width and height.
065       *
066       * @param width the number of pixels in the horizontal direction.
067       *
068       * @param height the number of pixels in the vertical direction.
069       */
070      public SampleModel createCompatibleSampleModel(int width, int height)
071      {
072        // Find minimum band offset.
073        int minBandoff = bandOffsets[0];
074        int numBands = bandOffsets.length;
075        for (int i = 1; i < numBands; i++)
076          {
077            if (bandOffsets[i] < minBandoff)
078              {
079                minBandoff = bandOffsets[i];
080              }
081          }
082        // Adjust band offsets so that minimum offset is at 0.
083        int[] bandOff;
084        if (minBandoff > 0)
085          {
086            bandOff = new int[numBands];
087            for (int i = 0; i < numBands; i++)
088              {
089                bandOff[i] = bandOffsets[i] - minBandoff;
090              }
091          }
092        else
093          {
094            bandOff = bandOffsets;
095          }
096        // Adjust scanline stride for new width.
097        return new PixelInterleavedSampleModel(dataType, width, height,
098                                               pixelStride, pixelStride * width,
099                                               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    }