lwgeom_trim_bits_in_place()

void lwgeom_trim_bits_in_place ( LWGEOM *  geom, int32_t  prec_x, int32_t  prec_y, int32_t  prec_z, int32_t  prec_m  )

extern

Trim the bits of an LWGEOM in place, to optimize it for compression.

Sets all bits to zero that are not required to maintain a specified number of digits after the decimal point. Negative precision values indicate digits before the decimal point do not need to be preserved.

Parameters

geom	input geometry
prec_x	precision (digits after decimal point) in x dimension
prec_y	precision (digits after decimal point) in y dimension
prec_z	precision (digits after decimal point) in z dimension
prec_m	precision (digits after decimal point) in m dimension

Definition at line 2665 of file lwgeom.c.

{
        LWPOINTITERATOR* it = lwpointiterator_create_rw(geom);
        POINT4D p;
 
        while (lwpointiterator_has_next(it))
        {
                lwpointiterator_peek(it, &p);
                p.x = trim_preserve_decimal_digits(p.x, prec_x);
                p.y = trim_preserve_decimal_digits(p.y, prec_y);
                if (lwgeom_has_z(geom))
                        p.z = trim_preserve_decimal_digits(p.z, prec_z);
                if (lwgeom_has_m(geom))
                        p.m = trim_preserve_decimal_digits(p.m, prec_m);
                lwpointiterator_modify_next(it, &p);
        }
 
        lwpointiterator_destroy(it);
}

References lwgeom_has_m(), lwgeom_has_z(), lwpointiterator_create_rw(), lwpointiterator_destroy(), lwpointiterator_has_next(), lwpointiterator_modify_next(), lwpointiterator_peek(), POINT4D::m, trim_preserve_decimal_digits(), POINT4D::x, POINT4D::y, and POINT4D::z.

Referenced by ST_QuantizeCoordinates(), and test_trim_bits().

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