//camvas-bpath.cpp:181

static void
sp_canvas_bpath_render (SPCanvasItem *item, SPCanvasBuf *buf)
{
    SPCanvasBPath *cbp = SP_CANVAS_BPATH (item);

    Geom::Rect area = buf->rect;

    if ( !cbp->curve  || 
         ((cbp->stroke_rgba & 0xff) == 0 && (cbp->fill_rgba & 0xff) == 0 ) || 
         cbp->curve->get_segment_count() < 1)
        return;

    if (!buf->ct)
        return;

    bool dofill = ((cbp->fill_rgba & 0xff) != 0);
    bool dostroke = ((cbp->stroke_rgba & 0xff) != 0);
    cairo_t *first_cr, *second_cr;
    cairo_surface_t *first, *second;
    first = cairo_image_surface_create(CAIRO_FORMAT_ARGB32, (int)buf->rect.width(), (int)buf->rect.height());
    sp_canvas_arena_render_surface(SP_CANVAS_ARENA(SP_ACTIVE_DESKTOP->getDrawing()), first, buf->rect);
    second  = cairo_surface_create_similar(cairo_get_target(buf->ct),
                                           CAIRO_CONTENT_COLOR_ALPHA, 
                                           (int)buf->rect.width(), 
                                           (int)buf->rect.height());
    first_cr = cairo_create(first);
    second_cr = cairo_create(second);
    
    cairo_set_tolerance(second_cr, 0.5);
    cairo_new_path(second_cr);

    feed_pathvector_to_cairo (second_cr, cbp->curve->get_pathvector(), cbp->affine, area,
        /* optimized_stroke = */ !dofill, 1);

    if (dofill) {
        // RGB / BGR
        ink_cairo_set_source_rgba32(second_cr, cbp->fill_rgba);
        cairo_set_fill_rule(second_cr, cbp->fill_rule == SP_WIND_RULE_EVENODD? CAIRO_FILL_RULE_EVEN_ODD
                            : CAIRO_FILL_RULE_WINDING);
        cairo_fill_preserve(second_cr);
    }

    if(dostroke) {
        ink_cairo_set_source_rgba32(second_cr, cbp->stroke_rgba);
        cairo_set_line_width(second_cr, 1);
        if (cbp->dashes[0] != 0 && cbp->dashes[1] != 0) {
            cairo_set_dash (second_cr, cbp->dashes, 2, 0);
        }
        cairo_stroke(second_cr);
    } else {
        cairo_new_path(second_cr);
    }
    if (cbp->xor_composite){
        cairo_set_operator (first_cr, CAIRO_OPERATOR_XOR);
    } else {
        cairo_set_operator (first_cr, CAIRO_OPERATOR_OVER);
    }
    cairo_set_source_surface(first_cr, second, 0, 0);
    cairo_paint(first_cr);
    cairo_set_source_surface(buf->ct, first, 0, 0);
    cairo_paint(buf->ct);
    cairo_surface_destroy(first);
    cairo_surface_destroy(second);
    cairo_destroy(first_cr);
    cairo_destroy(second_cr);
}