int scanlineStride, int[] bitMasks)
int[] bitMasks)
  public SinglePixelPackedSampleModel(int dataType, int w, int h,				      int scanlineStride, int[] bitMasks)  {    super(dataType, w, h, bitMasks.length);        this.scanlineStride = scanlineStride;    this.bitMasks = bitMasks;        bitOffsets = new int[numBands];    sampleSize = new int[numBands];        BitMaskExtent extent = new BitMaskExtent();    for (int b=0; b<numBands; b++)      {	extent.setMask(bitMasks[b]);	sampleSize[b] = extent.bitWidth;	bitOffsets[b] = extent.leastSignificantBit;      }  }