RASTER_metadata()

Datum RASTER_metadata

(

PG_FUNCTION_ARGS

)

Definition at line 592 of file rtpg_raster_properties.c.

{
        rt_pgraster *pgraster = NULL;
        rt_raster raster = NULL;
 
        uint32_t numBands;
        double scaleX;
        double scaleY;
        double ipX;
        double ipY;
        double skewX;
        double skewY;
        int32_t srid;
        uint32_t width;
        uint32_t height;
 
        TupleDesc tupdesc;
        Datum values[VALUES_LENGTH];
        bool nulls[VALUES_LENGTH];
        HeapTuple tuple;
        Datum result;
 
        POSTGIS_RT_DEBUG(3, "RASTER_metadata: Starting");
 
        /* pgraster is null, return null */
        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_metadata; Could not deserialize raster");
                PG_RETURN_NULL();
        }
 
        /* upper left x, y */
        ipX = rt_raster_get_x_offset(raster);
        ipY = rt_raster_get_y_offset(raster);
 
        /* width, height */
        width = rt_raster_get_width(raster);
        height = rt_raster_get_height(raster);
 
        /* scale x, y */
        scaleX = rt_raster_get_x_scale(raster);
        scaleY = rt_raster_get_y_scale(raster);
 
        /* skew x, y */
        skewX = rt_raster_get_x_skew(raster);
        skewY = rt_raster_get_y_skew(raster);
 
        /* srid */
        srid = rt_raster_get_srid(raster);
 
        /* numbands */
        numBands = rt_raster_get_num_bands(raster);
 
        rt_raster_destroy(raster);
        PG_FREE_IF_COPY(pgraster, 0);
 
        /* Build a tuple descriptor for our result type */
        if (get_call_result_type(fcinfo, NULL, &tupdesc) != TYPEFUNC_COMPOSITE) {
                ereport(ERROR, (
                        errcode(ERRCODE_FEATURE_NOT_SUPPORTED),
                        errmsg(
                                "function returning record called in context "
                                "that cannot accept type record"
                        )
                ));
        }
 
        BlessTupleDesc(tupdesc);
 
        values[0] = Float8GetDatum(ipX);
        values[1] = Float8GetDatum(ipY);
        values[2] = UInt32GetDatum(width);
        values[3] = UInt32GetDatum(height);
        values[4] = Float8GetDatum(scaleX);
        values[5] = Float8GetDatum(scaleY);
        values[6] = Float8GetDatum(skewX);
        values[7] = Float8GetDatum(skewY);
        values[8] = Int32GetDatum(srid);
        values[9] = UInt32GetDatum(numBands);
 
        memset(nulls, FALSE, sizeof(bool) * VALUES_LENGTH);
 
        /* build a tuple */
        tuple = heap_form_tuple(tupdesc, values, nulls);
 
        /* make the tuple into a datum */
        result = HeapTupleGetDatum(tuple);
 
        PG_RETURN_DATUM(result);
}

References FALSE, rt_raster_serialized_t::height, rt_raster_serialized_t::ipX, rt_raster_serialized_t::ipY, rt_raster_serialized_t::numBands, POSTGIS_RT_DEBUG, rtrowdump::raster, rt_raster_deserialize(), rt_raster_destroy(), rt_raster_get_height(), rt_raster_get_num_bands(), rt_raster_get_srid(), rt_raster_get_width(), 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(), rt_raster_serialized_t::scaleX, rt_raster_serialized_t::scaleY, rt_raster_serialized_t::skewX, rt_raster_serialized_t::skewY, rt_raster_serialized_t::srid, TRUE, VALUES_LENGTH, and rt_raster_serialized_t::width.

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