virtual PRInt32     GetBytesPix()       { return mInfo ? mInfo->cBitCount : 0; }
virtual PRInt32     GetBytesPix()       { return mInfo ? (mInfo->cBitCount <= 8 ? 1 : mInfo->cBitCount / 8) : 0; }
  virtual PRInt32     GetBytesPix()       { return mInfo ? mInfo->cBitCount : 0; }