RASTER_copyBand()

Datum RASTER_copyBand

(

PG_FUNCTION_ARGS

)

Definition at line 868 of file rtpg_create.c.

{
        rt_pgraster *pgto = NULL;
        rt_pgraster *pgfrom = NULL;
        rt_pgraster *pgrtn = NULL;
        rt_raster torast = NULL;
        rt_raster fromrast = NULL;
        int toindex = 0;
        int fromband = 0;
        int oldtorastnumbands = 0;
        int newtorastnumbands = 0;
        int newbandindex = 0;
 
        /* Deserialize torast */
        if (PG_ARGISNULL(0)) PG_RETURN_NULL();
        pgto = (rt_pgraster *)PG_DETOAST_DATUM(PG_GETARG_DATUM(0));
 
        torast = rt_raster_deserialize(pgto, FALSE);
        if (!torast) {
                PG_FREE_IF_COPY(pgto, 0);
                elog(ERROR, "RASTER_copyBand: Could not deserialize first raster");
                PG_RETURN_NULL();
        }
 
        /* Deserialize fromrast */
        if (!PG_ARGISNULL(1)) {
                pgfrom = (rt_pgraster *)PG_DETOAST_DATUM(PG_GETARG_DATUM(1));
 
                fromrast = rt_raster_deserialize(pgfrom, FALSE);
                if (!fromrast) {
                        rt_raster_destroy(torast);
                        PG_FREE_IF_COPY(pgfrom, 1);
                        PG_FREE_IF_COPY(pgto, 0);
                        elog(ERROR, "RASTER_copyBand: Could not deserialize second raster");
                        PG_RETURN_NULL();
                }
 
                oldtorastnumbands = rt_raster_get_num_bands(torast);
 
                if (PG_ARGISNULL(2))
                        fromband = 1;
                else
                        fromband = PG_GETARG_INT32(2);
 
                if (PG_ARGISNULL(3))
                        toindex = oldtorastnumbands + 1;
                else
                        toindex = PG_GETARG_INT32(3);
 
                /* Copy band fromrast torast */
                newbandindex = rt_raster_copy_band(
                        torast, fromrast,
                        fromband - 1, toindex - 1
                );
 
                newtorastnumbands = rt_raster_get_num_bands(torast);
                if (newtorastnumbands == oldtorastnumbands || newbandindex == -1) {
                        elog(NOTICE, "RASTER_copyBand: Could not add band to raster. "
                                "Returning original raster."
                        );
                }
 
                rt_raster_destroy(fromrast);
                PG_FREE_IF_COPY(pgfrom, 1);
        }
 
        /* Serialize and return torast */
        pgrtn = rt_raster_serialize(torast);
        rt_raster_destroy(torast);
        PG_FREE_IF_COPY(pgto, 0);
        if (!pgrtn) PG_RETURN_NULL();
 
        SET_VARSIZE(pgrtn, pgrtn->size);
        PG_RETURN_POINTER(pgrtn);
}

References FALSE, rt_raster_copy_band(), rt_raster_deserialize(), rt_raster_destroy(), rt_raster_get_num_bands(), rt_raster_serialize(), and rt_raster_serialized_t::size.

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