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# Header file for asi package
# set up the asi descriptor
define LEN_ASISTRUCT 10
define ASI_TYPE Memi[$1] # interpolator type
define ASI_NSINC Memi[$1+1] # sinc interpolator half-width
define ASI_NINCR Memi[$1+2] # number of sinc interpolator luts
define ASI_SHIFT Memr[P2R($1+3)] # sinc interpolator shift
define ASI_PIXFRAC Memr[P2R($1+4)] # pixel fraction for drizzle
define ASI_NCOEFF Memi[$1+5] # number of coefficients
define ASI_OFFSET Memi[$1+6] # offset of first data point
define ASI_COEFF Memi[$1+7] # pointer to coefficient array
define ASI_LTABLE Memi[$1+8] # pointer to sinc look-up table array
define ASI_BADVAL Memr[P2R($1+9)] # bad value for drizzle
# define element of the coefficient array
define COEFF Memr[P2P($1)] # element of the coefficient matrix
define LTABLE Memr[P2P($1)] # element of the look-up table
# define structure for ASISAVE and ASIRESTORE
define ASI_SAVETYPE $1[1]
define ASI_SAVENSINC $1[2]
define ASI_SAVENINCR $1[3]
define ASI_SAVESHIFT $1[4]
define ASI_SAVEPIXFRAC $1[5]
define ASI_SAVENCOEFF $1[6]
define ASI_SAVEOFFSET $1[7]
define ASI_SAVEBADVAL $1[8]
define ASI_SAVECOEFF 8
# define the sinc function truncation length, taper and precision parameters
# These should be identical to the definitions in im2interpdef.h.
define NSINC 15 # the sinc truncation length
define NINCR 20 # the number of sinc look-up tables
define DX 0.001 # sinc interpolation minimum
define PIXFRAC 1.0 # drizzle pixel fraction
define MIN_PIXFRAC 0.001 # the minimum drizzle pixel fraction
define BADVAL 0.0
# define number of points used in spline interpolation for ARIEVAL, ARIDER
# and ARBPIX
define SPLPTS 16
# miscellaneous
define SPLINE3_ORDER 4
define POLY3_ORDER 4
define POLY5_ORDER 6
define MAX_NDERIVS 6
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