RASTER_makeEmpty()

Datum RASTER_makeEmpty

(

PG_FUNCTION_ARGS

)

Definition at line 55 of file rtpg_create.c.

{
        uint16 width = 0, height = 0;
        double ipx = 0, ipy = 0, scalex = 0, scaley = 0, skewx = 0, skewy = 0;
        int32_t srid = SRID_UNKNOWN;
        rt_pgraster *pgraster = NULL;
        rt_raster raster;
 
        if (PG_NARGS() < 9) {
                elog(ERROR, "RASTER_makeEmpty: ST_MakeEmptyRaster requires 9 args");
                PG_RETURN_NULL();
        }
 
        if (!PG_ARGISNULL(0))
                width = PG_GETARG_UINT16(0);
 
        if (!PG_ARGISNULL(1))
                height = PG_GETARG_UINT16(1);
 
        if (!PG_ARGISNULL(2))
                ipx = PG_GETARG_FLOAT8(2);
 
        if (!PG_ARGISNULL(3))
                ipy = PG_GETARG_FLOAT8(3);
 
        if (!PG_ARGISNULL(4))
                scalex = PG_GETARG_FLOAT8(4);
 
        if (!PG_ARGISNULL(5))
                scaley = PG_GETARG_FLOAT8(5);
 
        if (!PG_ARGISNULL(6))
                skewx = PG_GETARG_FLOAT8(6);
 
        if (!PG_ARGISNULL(7))
                skewy = PG_GETARG_FLOAT8(7);
 
        if (!PG_ARGISNULL(8))
                srid = PG_GETARG_INT32(8);
 
        POSTGIS_RT_DEBUGF(4, "%dx%d, ip:%g,%g, scale:%g,%g, skew:%g,%g srid:%d",
                width, height, ipx, ipy, scalex, scaley,
                skewx, skewy, srid);
 
        raster = rt_raster_new(width, height);
        if (raster == NULL)
                PG_RETURN_NULL(); /* error was supposedly printed already */
 
        rt_raster_set_scale(raster, scalex, scaley);
        rt_raster_set_offsets(raster, ipx, ipy);
        rt_raster_set_skews(raster, skewx, skewy);
        rt_raster_set_srid(raster, srid);
 
        pgraster = rt_raster_serialize(raster);
        rt_raster_destroy(raster);
        if (!pgraster)
                PG_RETURN_NULL();
 
        SET_VARSIZE(pgraster, pgraster->size);
        PG_RETURN_POINTER(pgraster);
}

References POSTGIS_RT_DEBUGF, rt_raster_destroy(), rt_raster_new(), rt_raster_serialize(), rt_raster_set_offsets(), rt_raster_set_scale(), rt_raster_set_skews(), rt_raster_set_srid(), rt_raster_serialized_t::size, and SRID_UNKNOWN.

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