mvt_unsafe_clip_by_box()

static LWGEOM* mvt_unsafe_clip_by_box ( LWGEOM *  lwg_in, GBOX *  clip_box  )

static

Definition at line 812 of file mvt.c.

{
        LWGEOM *geom_clipped;
        GBOX geom_box;
 
        gbox_init(&geom_box);
        FLAGS_SET_GEODETIC(geom_box.flags, 0);
        lwgeom_calculate_gbox(lwg_in, &geom_box);
 
        if (!gbox_overlaps_2d(&geom_box, clip_box))
        {
                POSTGIS_DEBUG(3, "mvt_geom: geometry outside clip box");
                return NULL;
        }
 
        if (gbox_contains_2d(clip_box, &geom_box))
        {
                POSTGIS_DEBUG(3, "mvt_geom: geometry contained fully inside the box");
                return lwg_in;
        }
 
        geom_clipped = lwgeom_clip_by_rect(lwg_in, clip_box->xmin, clip_box->ymin, clip_box->xmax, clip_box->ymax);
        if (!geom_clipped || lwgeom_is_empty(geom_clipped))
                return NULL;
        return geom_clipped;
}

References GBOX::flags, FLAGS_SET_GEODETIC, gbox_contains_2d(), gbox_init(), gbox_overlaps_2d(), lwgeom_calculate_gbox(), lwgeom_clip_by_rect(), lwgeom_is_empty(), GBOX::xmax, GBOX::xmin, GBOX::ymax, and GBOX::ymin.

Referenced by mvt_iterate_clip_by_box_geos().

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