RASTER_setBandNoDataValue()

Datum RASTER_setBandNoDataValue

(

PG_FUNCTION_ARGS

)

Definition at line 797 of file rtpg_band_properties.c.

{
        rt_pgraster *pgraster = NULL;
        rt_pgraster *pgrtn = NULL;
        rt_raster raster = NULL;
        rt_band band = NULL;
        double nodata;
        int32_t bandindex;
        bool forcechecking = FALSE;
        bool skipset = FALSE;
 
        /* Deserialize raster */
        if (PG_ARGISNULL(0))
                PG_RETURN_NULL();
        pgraster = (rt_pgraster *) PG_DETOAST_DATUM(PG_GETARG_DATUM(0));
 
        /* 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). Nodata value not set. Returning original raster");
                skipset = TRUE;
        }
 
        raster = rt_raster_deserialize(pgraster, FALSE);
        if (!raster) {
                PG_FREE_IF_COPY(pgraster, 0);
                elog(ERROR, "RASTER_setBandNoDataValue: Could not deserialize raster");
                PG_RETURN_NULL();
        }
 
        if (!skipset) {
                /* Fetch requested band */
                band = rt_raster_get_band(raster, bandindex - 1);
                if (!band) {
                        elog(NOTICE, "Could not find raster band of index %d when setting pixel value. Nodata value not set. Returning original raster", bandindex);
                }
                else {
                        if (!PG_ARGISNULL(3))
                                forcechecking = PG_GETARG_BOOL(3);
 
                        if (PG_ARGISNULL(2)) {
                                /* Set the hasnodata flag to FALSE */
                                rt_band_set_hasnodata_flag(band, FALSE);
                                POSTGIS_RT_DEBUGF(3, "Raster band %d does not have a nodata value", bandindex);
                        }
                        else {
                                /* Get the nodata value */
                                nodata = PG_GETARG_FLOAT8(2);
 
                                /* Set the band's nodata value */
                                rt_band_set_nodata(band, nodata, NULL);
 
                                /* Recheck all pixels if requested */
                                if (forcechecking)
                                        rt_band_check_is_nodata(band);
                        }
                }
        }
 
        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, POSTGIS_RT_DEBUGF, rtrowdump::raster, rt_band_check_is_nodata(), rt_band_set_hasnodata_flag(), rt_band_set_nodata(), rt_raster_deserialize(), rt_raster_destroy(), rt_raster_get_band(), rt_raster_serialize(), rt_raster_serialized_t::size, and TRUE.

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