/usr/share/pyshared/pywcs/include/sip.h

/*
Copyright (C) 2008-2012 Association of Universities for Research in Astronomy (AURA)

Redistribution and use in source and binary forms, with or without
modification, are permitted provided that the following conditions are met:

    1. Redistributions of source code must retain the above copyright
      notice, this list of conditions and the following disclaimer.

    2. Redistributions in binary form must reproduce the above
      copyright notice, this list of conditions and the following
      disclaimer in the documentation and/or other materials provided
      with the distribution.

    3. The name of AURA and its representatives may not be used to
      endorse or promote products derived from this software without
      specific prior written permission.

THIS SOFTWARE IS PROVIDED BY AURA ``AS IS'' AND ANY EXPRESS OR IMPLIED
WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES OF
MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE
DISCLAIMED. IN NO EVENT SHALL AURA BE LIABLE FOR ANY DIRECT, INDIRECT,
INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING,
BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS
OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND
ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR
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*/

/*
 Author: Michael Droettboom
         mdroe@stsci.edu
*/

#ifndef __SIP_H__
#define __SIP_H__

#include "util.h"

typedef struct {
  unsigned int                    a_order;
  /*@null@*/ /*@shared@*/ double* a;
  unsigned int                    b_order;
  /*@null@*/ /*@shared@*/ double* b;
  unsigned int                    ap_order;
  /*@null@*/ /*@shared@*/ double* ap;
  unsigned int                    bp_order;
  /*@null@*/ /*@shared@*/ double* bp;
  double                          crpix[2];
  /*@null@*/ double*              scratch;
  struct wcserr*                  err;
} sip_t;

/**
Sets all the values of the sip_t structure to NULLs or zeros.
*/
void
sip_clear(sip_t* sip);

/**
Set the values of the sip_t structure.

The values expected are all exactly as defined in the FITS SIP header
keywords.

The arrays/matrices are all *copied* into the SIP struct.  To free the
memory that sip_t allocates for itself, call sip_free.

@param a_order: The order of the A_i_j matrix

@param a: The A_i_j array, which must be of size [a_order+1][a_order+1]

@param b_order: The order of the B_i_j matrix

@param b: The B_i_j array, which must be of size [b_order+1][b_order+1]

@param ap_order: The order of the AP_i_j matrix

@param ap: The AP_i_j array, which must be of size [ap_order+1][ap_order+1]

@param bp_order: The order of the BP_i_j matrix

@param bp: The BP_i_j array, which must be of size [bp_order+1][bp_order+1]

@param crpix: The position of the reference pixel
*/
int
sip_init(
    sip_t* sip,
    const unsigned int a_order, const double* a,
    const unsigned int b_order, const double* b,
    const unsigned int ap_order, const double* ap,
    const unsigned int bp_order, const double* bp,
    const double* crpix /* [2] */);

/**
Frees the memory allocated for the sip_t struct.
*/
void
sip_free(sip_t* sip);

/**
Converts pixel coordinates to focal plane coordinates using the SIP
polynomial distortion convention, and the values stored in the sip_t
struct.

@param naxes

@param nelem

@param pix [in]: An array of pixel coordinates

@param foc [out]: An array of focal plane coordinates

@return A wcslib error code
*/
int
sip_pix2foc(
    const sip_t* sip,
    const unsigned int naxes,
    const unsigned int nelem,
    const double* pix /* [NAXES][nelem] */,
    double* foc /* [NAXES][nelem] */);

/**
Computes the offset deltas necessary to convert pixel coordinates to
focal plane coordinates using the SIP polynomial distortion
convention, and the values stored in the sip_t struct.  The deltas are
added to the existing values in pix.

@param naxes

@param nelem

@param pix [in]: An array of pixel coordinates

@param foc [in/out]: An array of deltas, that when added to pix
results in focal plane coordinates.

@return A wcslib error code
*/
int
sip_pix2deltas(
    const sip_t* sip,
    const unsigned int naxes,
    const unsigned int nelem,
    const double* pix /* [NAXES][nelem] */,
    double* foc /* [NAXES][nelem] */);

/**
Adds the offset deltas necessary to convert focal plane
coordinates to pixel coordinates using the SIP polynomial distortion
convention, and the values stored in the sip_t struct.  The deltas
are added to the existing values in pix.

@param naxes

@param nelem

@param foc [in]: An array of focal plane coordinates

@param pix [in/out]: An array of pixel coordinates

@return A wcslib error code
*/
int
sip_foc2pix(
    const sip_t* sip,
    const unsigned int naxes,
    const unsigned int nelem,
    const double* foc /* [NAXES][nelem] */,
    double* pix /* [NAXES][nelem] */);

/**
Computes the offset deltas necessary to convert focal plane
coordinates to pixel coordinates using the SIP polynomial distortion
convention, and the values stored in the sip_t struct.  The deltas are
added to the existing values in foc.

@param naxes

@param nelem

@param foc [in]: An array of focal plane coordinates

@param foc [in/out]: An array of deltas, that when added to pix
results in focal plane coordinates.

@return A wcslib error code
*/
int
sip_foc2deltas(
    const sip_t* sip,
    const unsigned int naxes,
    const unsigned int nelem,
    const double* foc /* [NAXES][nelem] */,
    double* deltas /* [NAXES][nelem] */);

#endif
python-pywcs 1.11-1 / usr / share / pyshared / pywcs / include / sip.h
