RASTER_getGeotransform()

Datum RASTER_getGeotransform

(

PG_FUNCTION_ARGS

)

Definition at line 439 of file rtpg_raster_properties.c.

{
    rt_pgraster *pgraster = NULL;
    rt_raster raster = NULL;
 
    double imag;
    double jmag;
    double theta_i;
    double theta_ij;
                /*
    double xoffset;
    double yoffset;
                */
 
    TupleDesc result_tuple; /* for returning a composite */
    Datum values[VALUES_LENGTH];
    bool nulls[VALUES_LENGTH];
    HeapTuple heap_tuple ;   /* instance of the tuple to return */
    Datum result;
 
    POSTGIS_RT_DEBUG(3, "RASTER_getGeotransform: Starting");
 
    /* get argument */
    if (PG_ARGISNULL(0))
        PG_RETURN_NULL();
    pgraster = (rt_pgraster *)PG_DETOAST_DATUM_SLICE(PG_GETARG_DATUM(0), 0, sizeof(struct rt_raster_serialized_t));
 
    /* raster */
    raster = rt_raster_deserialize(pgraster, TRUE);
    if (!raster) {
        PG_FREE_IF_COPY(pgraster, 0);
        elog(ERROR, "RASTER_getGeotransform: Could not deserialize raster");
        PG_RETURN_NULL();
    }
 
    /* do the calculation */
    rt_raster_calc_phys_params(
            rt_raster_get_x_scale(raster),
            rt_raster_get_x_skew(raster),
            rt_raster_get_y_skew(raster),
            rt_raster_get_y_scale(raster),
            &imag, &jmag, &theta_i, &theta_ij) ;
 
    rt_raster_destroy(raster);
    PG_FREE_IF_COPY(pgraster, 0);
 
    /* setup the return value infrastructure */
    if (get_call_result_type(fcinfo, NULL, &result_tuple) != TYPEFUNC_COMPOSITE) {
        ereport(ERROR, (
            errcode(ERRCODE_FEATURE_NOT_SUPPORTED),
            errmsg("RASTER_getGeotransform(): function returning record called in context that cannot accept type record"
            )
        ));
        PG_RETURN_NULL();
    }
 
    BlessTupleDesc(result_tuple);
 
    /* get argument */
    /* prep the composite return value */
    /* construct datum array */
    values[0] = Float8GetDatum(imag);
    values[1] = Float8GetDatum(jmag);
    values[2] = Float8GetDatum(theta_i);
    values[3] = Float8GetDatum(theta_ij);
    values[4] = Float8GetDatum(rt_raster_get_x_offset(raster));
    values[5] = Float8GetDatum(rt_raster_get_y_offset(raster));
 
    memset(nulls, FALSE, sizeof(bool) * VALUES_LENGTH);
 
    /* stick em on the heap */
    heap_tuple = heap_form_tuple(result_tuple, values, nulls);
 
    /* make the tuple into a datum */
    result = HeapTupleGetDatum(heap_tuple);
 
    PG_RETURN_DATUM(result);
}

References FALSE, POSTGIS_RT_DEBUG, result, rt_raster_calc_phys_params(), rt_raster_deserialize(), rt_raster_destroy(), rt_raster_get_x_offset(), rt_raster_get_x_scale(), rt_raster_get_x_skew(), rt_raster_get_y_offset(), rt_raster_get_y_scale(), rt_raster_get_y_skew(), TRUE, and VALUES_LENGTH.

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