pgis_asmvt_transfn()

Datum pgis_asmvt_transfn

(

PG_FUNCTION_ARGS

)

Definition at line 126 of file lwgeom_out_mvt.c.

{
#ifndef HAVE_LIBPROTOBUF
        elog(ERROR, "ST_AsMVT: Compiled without protobuf-c support");
        PG_RETURN_NULL();
#else
        MemoryContext aggcontext, old_context;
        mvt_agg_context *ctx;
 
        /* We need to initialize the internal cache to access it later via postgis_oid() */
        postgis_initialize_cache();
 
        if (!AggCheckCallContext(fcinfo, &aggcontext))
                elog(ERROR, "%s called in non-aggregate context", __func__);
 
        if (PG_ARGISNULL(0)) {
                old_context = MemoryContextSwitchTo(aggcontext);
                ctx = palloc(sizeof(*ctx));
                ctx->name = "default";
                if (PG_NARGS() > 2 && !PG_ARGISNULL(2))
                        ctx->name = text_to_cstring(PG_GETARG_TEXT_P(2));
                ctx->extent = 4096;
                if (PG_NARGS() > 3 && !PG_ARGISNULL(3))
                        ctx->extent = PG_GETARG_INT32(3);
                ctx->geom_name = NULL;
                if (PG_NARGS() > 4 && !PG_ARGISNULL(4))
                        ctx->geom_name = text_to_cstring(PG_GETARG_TEXT_P(4));
                if (PG_NARGS() > 5 && !PG_ARGISNULL(5))
                        ctx->id_name = text_to_cstring(PG_GETARG_TEXT_P(5));
                else
                        ctx->id_name = NULL;
 
                ctx->trans_context = AllocSetContextCreate(aggcontext, "MVT transfn", ALLOCSET_DEFAULT_SIZES);
 
                MemoryContextSwitchTo(ctx->trans_context);
                mvt_agg_init_context(ctx);
                MemoryContextSwitchTo(old_context);
        } else {
                ctx = (mvt_agg_context *) PG_GETARG_POINTER(0);
        }
 
        if (!type_is_rowtype(get_fn_expr_argtype(fcinfo->flinfo, 1)))
                elog(ERROR, "%s: parameter row cannot be other than a rowtype", __func__);
        ctx->row = PG_GETARG_HEAPTUPLEHEADER(1);
 
        old_context = MemoryContextSwitchTo(ctx->trans_context);
        mvt_agg_transfn(ctx);
        MemoryContextSwitchTo(old_context);
 
        PG_FREE_IF_COPY(ctx->row, 1);
        PG_RETURN_POINTER(ctx);
#endif
}

References mvt_agg_context::extent, mvt_agg_context::geom_name, mvt_agg_context::id_name, mvt_agg_init_context(), mvt_agg_transfn(), mvt_agg_context::name, mvt_agg_context::row, and mvt_agg_context::trans_context.

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