mvt_clip_and_validate_geos()

static LWGEOM* mvt_clip_and_validate_geos ( LWGEOM *  lwgeom, uint8_t  basic_type, uint32_t  extent, uint32_t  buffer, bool  clip_geom  )

static

Definition at line 1093 of file mvt.c.

{
        LWGEOM *ng = lwgeom;
 
        if (clip_geom)
        {
                GBOX bgbox;
                gbox_init(&bgbox);
                bgbox.xmax = bgbox.ymax = (double)extent + (double)buffer;
                bgbox.xmin = bgbox.ymin = -(double)buffer;
                FLAGS_SET_GEODETIC(bgbox.flags, 0);
 
                ng = mvt_iterate_clip_by_box_geos(lwgeom, &bgbox, basic_type);
                if (!ng || lwgeom_is_empty(ng))
                {
                        POSTGIS_DEBUG(3, "mvt_geom: no geometry after clip");
                        return NULL;
                }
        }
 
        ng = mvt_grid_and_validate_geos(ng, basic_type);
 
        /* Make sure we return the expected type */
        if (!ng || basic_type != lwgeom_get_basic_type(ng))
        {
                /* Drop type changes to play nice with MVT renderers */
                POSTGIS_DEBUG(1, "mvt_geom: Dropping geometry after type change");
                return NULL;
        }
 
        return ng;
}

References buffer(), GBOX::flags, FLAGS_SET_GEODETIC, gbox_init(), lwgeom_get_basic_type(), lwgeom_is_empty(), mvt_grid_and_validate_geos(), mvt_iterate_clip_by_box_geos(), GBOX::xmax, GBOX::xmin, GBOX::ymax, and GBOX::ymin.

Referenced by mvt_clip_and_validate().

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