15 |
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#define NI2DSMF 0.42f /* minimal smoothing factor */ |
16 |
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17 |
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#define NI2DIR (2*4) /* # interpolation directions */ |
18 |
+ |
#define NI2DIM 16 /* size of black flag array */ |
19 |
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20 |
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/* Data structure for interpolant */ |
21 |
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typedef struct { |
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int ns; /* number of sample positions */ |
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float dmin; /* minimum diameter (default=1) */ |
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float smf; /* smoothing factor (def=NI2DSMF) */ |
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< |
unsigned short (*da)[NI2DIR]; /* anisotropic distances (private) */ |
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> |
float smin[2]; /* sample minima */ |
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> |
float smul[2]; /* NI2DIM/(smax-smin) */ |
27 |
> |
float grid2; /* twice grid diameter squared */ |
28 |
> |
struct interp2_samp { |
29 |
> |
unsigned short dia[NI2DIR]; |
30 |
> |
unsigned short blkflg[NI2DIM]; |
31 |
> |
} *da; /* direction array (private) */ |
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float spt[1][2]; /* sample positions (extends struct) */ |
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} INTERP2; |
34 |
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55 |
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56 |
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/* (Re)compute anisotropic basis function interpolant (normally automatic) */ |
57 |
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extern int interp2_analyze(INTERP2 *ip); |
58 |
+ |
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59 |
+ |
/* Compute unnormalized weight for a position relative to a sample */ |
60 |
+ |
double interp2_wti(INTERP2 *ip, const int i, double x, double y); |
61 |
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62 |
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/*************************************************************** |
63 |
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* Typical use is to allocate an INTERP2 struct and assign the |