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typedef struct _geom_elem {

  double        coeffs[6];

} pGeomDefRec, *pGeomDefPtr;

typedef struct _mpgeombanddef {

        int     yOut;

        int     in_width;

} mpGeometryBandRec, *mpGeometryBandPtr;

typedef void *pointer;

typedef unsigned char  CARD8;

typedef CARD8 BytePixel;

void  BiGL_B  (OUTP,srcimg,width,sline,pedpvt,pvtband)  pointer OUTP;

pointer *srcimg;

register int width;

int sline;

pGeomDefPtr pedpvt; mpGeometryBandPtr pvtband;

{

  register float s, t, st;

  register int  isrcline,isrcpix;

  register int  srcwidth = pvtband->in_width - 1;

  register   BytePixel  val;

  register   BytePixel  *ptrIn, *ptrJn;

  register double a  = pedpvt->coeffs[0];

  register double c  = pedpvt->coeffs[2];

  register double srcpix  = a * ((double)(0.0000))  +   pedpvt->coeffs[1] * (pvtband->yOut + ((double)(0.0000)) ) +     pedpvt->coeffs[4];

  register double srcline = c * ((double)(0.0000))  +   pedpvt->coeffs[3] * (pvtband->yOut + ((double)(0.0000)) ) +     pedpvt->coeffs[5];

  if ( (isrcpix >= 0) && (isrcpix < srcwidth) )

    val =       ptrIn[isrcpix]   * ((float)1. - s - t + st) + ptrIn[isrcpix+1] * (s - st) +     ptrJn[isrcpix]   * (t - st) +   ptrJn[isrcpix+1] * (st) +   (float)0.5 ;

}