RASTER_setBandIsNoData()

Datum RASTER_setBandIsNoData

(

PG_FUNCTION_ARGS

)

Definition at line 852 of file rtpg_band_properties.c.

{
        rt_pgraster *pgraster = NULL;
        rt_pgraster *pgrtn = NULL;
        rt_raster raster = NULL;
        rt_band band = NULL;
        int32_t bandindex;
 
        if (PG_ARGISNULL(0))
                PG_RETURN_NULL();
        pgraster = (rt_pgraster *) PG_DETOAST_DATUM(PG_GETARG_DATUM(0));
 
        raster = rt_raster_deserialize(pgraster, FALSE);
        if (!raster) {
                PG_FREE_IF_COPY(pgraster, 0);
                elog(ERROR, "RASTER_setBandIsNoData: Could not deserialize raster");
                PG_RETURN_NULL();
        }
 
        /* Check index is not NULL or smaller than 1 */
        if (PG_ARGISNULL(1))
                bandindex = -1;
        else
                bandindex = PG_GETARG_INT32(1);
 
        if (bandindex < 1)
                elog(NOTICE, "Invalid band index (must use 1-based). Isnodata flag not set. Returning original raster");
        else {
                /* Fetch requested band */
                band = rt_raster_get_band(raster, bandindex - 1);
 
                if (!band)
                        elog(NOTICE, "Could not find raster band of index %d. Isnodata flag not set. Returning original raster", bandindex);
                else {
                        if (!rt_band_get_hasnodata_flag(band)) {
                                elog(NOTICE, "Band of index %d has no NODATA so cannot be NODATA. Returning original raster", bandindex);
                        }
                        /* Set the band's nodata value */
                        else {
                                rt_band_set_isnodata_flag(band, 1);
                        }
                }
        }
 
        /* Serialize raster again */
        pgrtn = rt_raster_serialize(raster);
        rt_raster_destroy(raster);
        PG_FREE_IF_COPY(pgraster, 0);
        if (!pgrtn) PG_RETURN_NULL();
 
        SET_VARSIZE(pgrtn, pgrtn->size);
        PG_RETURN_POINTER(pgrtn);
}

References ovdump::band, FALSE, rtrowdump::raster, rt_band_get_hasnodata_flag(), rt_band_set_isnodata_flag(), rt_raster_deserialize(), rt_raster_destroy(), rt_raster_get_band(), rt_raster_serialize(), and rt_raster_serialized_t::size.

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