bandedsamplemodel.java

gcc的组建

/* Copyright (C) 2004, 2005, Free Software Foundation

This file is part of GNU Classpath.

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package java.awt.image;

/**
 * MultiPixelPackedSampleModel provides a single band model that supports
 * multiple pixels in a single unit.  Pixels have 2^n bits and 2^k pixels fit
 * per data element.
 *
 * @author Jerry Quinn ([e-mail])
 */
public final class BandedSampleModel extends ComponentSampleModel
{
  private int[] bitMasks;
  private int[] bitOffsets;
  private int[] sampleSize;
  private int dataBitOffset;
  private int elemBits;
  private int numberOfBits;
  private int numElems;

  private static int[] createBankArray(int size) 
  {
    int[] result = new int[size];
    for (int i = 0; i < size; i++)
      result[i] = i;
    return result;
  }

  public BandedSampleModel(int dataType, int w, int h, int numBands)
  {
    this(dataType, w, h, w, createBankArray(numBands), new int[numBands]);
  }

  public BandedSampleModel(int dataType, int w, int h, int scanlineStride,
			   int[] bankIndices, int[] bandOffsets)
  {
    super(dataType, w, h, 1, scanlineStride, bankIndices, bandOffsets);
  }

  public SampleModel createCompatibleSampleModel(int w, int h)
  {
    // NOTE: blackdown 1.4.1 sets all offsets to 0.  Sun's 1.4.2 docs
    // disagree.

    // Compress offsets so minimum is 0, others w*scanlineStride
    int[] newoffsets = new int[bandOffsets.length];
    int[] order = new int[bandOffsets.length];
    for (int i=0; i < bandOffsets.length; i++)
      order[i] = i;
    // FIXME: This is N^2, but not a big issue, unless there's a lot of
    // bands...
    for (int i=0; i < bandOffsets.length; i++)
      for (int j=i+1; j < bandOffsets.length; i++)
	if (bankIndices[order[i]] > bankIndices[order[j]]
	    || (bankIndices[order[i]] == bankIndices[order[j]]
		&& bandOffsets[order[i]] > bandOffsets[order[j]]))
	  {
	    int t = order[i]; order[i] = order[j]; order[j] = t;
	  }
    int bank = 0;
    int offset = 0;
    for (int i=0; i < bandOffsets.length; i++)
      {
	if (bankIndices[order[i]] != bank)
	  {
	    bank = bankIndices[order[i]];
	    offset = 0;
	  }
	newoffsets[order[i]] = offset;
	offset += w * scanlineStride;
      }
    
    return new BandedSampleModel(dataType, w, h, scanlineStride, bankIndices, newoffsets);
  }


  public SampleModel createSubsetSampleModel(int[] bands)
  {
    if (bands.length > bankIndices.length)
      throw new
	RasterFormatException("BandedSampleModel createSubsetSampleModel too"
			      +" many bands");
    int[] newoff = new int[bands.length];
    int[] newbanks = new int[bands.length];
    for (int i=0; i < bands.length; i++)
      {
	int b = bands[i];
	newoff[i] = bandOffsets[b];
	newbanks[i] = bankIndices[b];
      }

    return new BandedSampleModel(dataType, width, height, scanlineStride,
				 newbanks, newoff);
  }

  /**
   * Extract all samples of one pixel and return in an array of transfer type.
   *
   * Extracts the pixel at x, y from data and stores samples into the array
   * obj.  If obj is null, a new array of getTransferType() is created.
   *
   * @param x The x-coordinate of the pixel rectangle to store in <code>obj</code>.
   * @param y The y-coordinate of the pixel rectangle to store in <code>obj</code>.
   * @param obj The primitive array to store the pixels into or null to force creation.
   * @param data The DataBuffer that is the source of the pixel data.
   * @return The primitive array containing the pixel data.
   * @see java.awt.image.SampleModel#getDataElements(int, int, java.lang.Object, java.awt.image.DataBuffer)
   */
  public Object getDataElements(int x, int y, Object obj,
				DataBuffer data)
  {
    int pixel = getSample(x, y, 0, data);
    switch (getTransferType())
    {
    case DataBuffer.TYPE_BYTE:
      {
	byte[] b = (byte[])obj;
	if (b == null) b = new byte[numBands];
	for (int i=0; i < numBands; i++)
	  b[i] = (byte)getSample(x, y, i, data);
	return b;
      }
    case DataBuffer.TYPE_SHORT:
    case DataBuffer.TYPE_USHORT:
      {
	short[] b = (short[])obj;
	if (b == null) b = new short[numBands];
	for (int i=0; i < numBands; i++)
	  b[i] = (short)getSample(x, y, i, data);
	return b;
      }
    case DataBuffer.TYPE_INT:
      {
	int[] b = (int[])obj;
	if (b == null) b = new int[numBands];
	for (int i=0; i < numBands; i++)
	  b[i] = getSample(x, y, i, data);
	return b;
      }
    case DataBuffer.TYPE_FLOAT:
      {
	float[] b = (float[])obj;
	if (b == null) b = new float[numBands];
	for (int i=0; i < numBands; i++)
	  b[i] = getSampleFloat(x, y, i, data);
	return b;
      }
    case DataBuffer.TYPE_DOUBLE:
      {
	double[] b = (double[])obj;
	if (b == null) b = new double[numBands];
	for (int i=0; i < numBands; i++)
	  b[i] = getSample(x, y, i, data);
	return b;
      }

    default:
      // Seems like the only sensible thing to do.
      throw new ClassCastException();
    }
  }

  public int[] getPixel(int x, int y, int[] iArray, DataBuffer data)
  {
    if (iArray == null) iArray = new int[numBands];
    for (int i=0; i < numBands; i++)
      iArray[i] = getSample(x, y, i, data);
	
    return iArray;
  }

  /**
   * Copy pixels from a region into an array.
   *
   * Copies the samples of the pixels in the rectangle starting at x, y that
   * is w pixels wide and h scanlines high.  When there is more than one band,
   * the samples stored in order before the next pixel.  This ordering isn't
   * well specified in Sun's docs as of 1.4.2.
   *
   * If iArray is null, a new array is allocated, filled, and returned.
   *
   * @param x The x-coordinate of the pixel rectangle to store in
   * <code>iArray</code>.
   * @param y The y-coordinate of the pixel rectangle to store in
   * <code>iArray</code>.
   * @param w The width in pixels of the rectangle.
   * @param h The height in pixels of the rectangle.
   * @param iArray The int array to store the pixels into or null to force
   * creation.
   * @param data The DataBuffer that is the source of the pixel data.
   * @return The primitive array containing the pixel data.
   */
  public int[] getPixels(int x, int y, int w, int h, int[] iArray,
			 DataBuffer data)
  {
    if (iArray == null) iArray = new int[w*h*numBands];
    int outOffset = 0;
    int maxX = x + w;
    int maxY = y + h;
    for (int yy = x; yy < maxY; yy++)
      {
	for (int xx = x; xx < maxX; xx++)
	  {
	    for (int b = 0; b < numBands; b++)
	      {
		int offset = bandOffsets[b] + yy * scanlineStride + xx;
		iArray[outOffset++] =
		  data.getElem(bankIndices[b], offset);
	      }
	  }
      }
    return iArray;	
  }

  public int getSample(int x, int y, int b, DataBuffer data)
  {
    int offset = bandOffsets[b] + y * scanlineStride + x;
    return data.getElem(bankIndices[b], offset);
  }
  
  public float getSampleFloat(int x, int y, int b, DataBuffer data)
  {
    int offset = bandOffsets[b] + y * scanlineStride + x;
    return data.getElemFloat(bankIndices[b], offset);
  }
  
  public double getSampleDouble(int x, int y, int b, DataBuffer data)
  {
    int offset = bandOffsets[b] + y * scanlineStride + x;
    return data.getElemDouble(bankIndices[b], offset);
  }
  
  /**
   * Copy one band's samples from a region into an array.
   *
   * Copies from one band the samples of the pixels in the rectangle starting
   * at x, y that is w pixels wide and h scanlines high.
   *
   * If iArray is null, a new array is allocated, filled, and returned.
   *