Retro68/gcc/libjava/classpath/java/awt/image/PixelInterleavedSampleModel.java

/* PixelInterleavedSampleModel.java
   Copyright (C) 2004, 2005  Free Software Foundation, Inc.

This file is part of GNU Classpath.

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it under the terms of the GNU General Public License as published by
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02110-1301 USA.

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permission to link this library with independent modules to produce an
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package java.awt.image;


/**
 * A <code>SampleModel</code> that uses exactly one element of the
 * raster&#x2019;s {@link DataBuffer} per pixel, holds all bands in a
 * single bank, and stores band data in pixel-interleaved manner.
 *
 * @since 1.2
 *
 * @author Sascha Brawer (brawer@dandelis.ch)
 */
public class PixelInterleavedSampleModel
  extends ComponentSampleModel
{
  public PixelInterleavedSampleModel(int dataType, int width, int height,
                                     int pixelStride, int scanlineStride,
                                     int[] bandOffsets)
  {
    super(dataType, width, height, pixelStride, scanlineStride,
          bandOffsets);
  }


  /**
   * Creates a new <code>SampleModel</code> that is like this one, but
   * uses the specified width and height.
   *
   * @param width the number of pixels in the horizontal direction.
   *
   * @param height the number of pixels in the vertical direction.
   */
  public SampleModel createCompatibleSampleModel(int width, int height)
  {
    // Find minimum band offset.
    int minBandoff = bandOffsets[0];
    int numBands = bandOffsets.length;
    for (int i = 1; i < numBands; i++)
      {
        if (bandOffsets[i] < minBandoff)
          {
            minBandoff = bandOffsets[i];
          }
      }
    // Adjust band offsets so that minimum offset is at 0.
    int[] bandOff;
    if (minBandoff > 0)
      {
        bandOff = new int[numBands];
        for (int i = 0; i < numBands; i++)
          {
            bandOff[i] = bandOffsets[i] - minBandoff;
          }
      }
    else
      {
        bandOff = bandOffsets;
      }
    // Adjust scanline stride for new width.
    return new PixelInterleavedSampleModel(dataType, width, height,
                                           pixelStride, pixelStride * width,
                                           bandOff);
  }


  /**
   * Creates a new <code>SampleModel</code> that is like this one, but
   * uses only a subset of its bands.
   *
   * @param bands an array whose elements indicate which bands shall
   * be part of the subset. For example, <code>[0, 2, 3]</code> would
   * create a SampleModel containing bands #0, #2 and #3.
   */
  public SampleModel createSubsetSampleModel(int[] bands)
  {
    int[] subOffsets;

    subOffsets = new int[bands.length];
    for (int i = 0; i < bands.length; i++)
      subOffsets[i] = bandOffsets[bands[i]];

    return new PixelInterleavedSampleModel(dataType, width, height,
                                           pixelStride, scanlineStride,
                                           subOffsets);
  }
}