suppress unnecessary test output in release mode

tests/libslic3r/test_marchingsquares.cpp

@@ -325,7 +325,7 @@ static void recreate_object_from_rasters(const std::string &objname, float lh) {
     sla::RasterBase::Resolution res{2560, 1440};
     double                      disp_w = 120.96;
     double                      disp_h = 68.04;
-    
+
     size_t cntr = 0;
     for (ExPolygons &layer : layers) {
         auto rst = create_raster(res, disp_w, disp_h);
@@ -334,26 +334,31 @@ static void recreate_object_from_rasters(const std::string &objname, float lh) {
             rst.draw(island);
         }
         
+#ifndef NDEBUG
         std::fstream out(objname + std::to_string(cntr) + ".png", std::ios::out);
         out << rst.encode(sla::PNGRasterEncoder{});
         out.close();
+#endif
         
         ExPolygons layer_ = sla::raster_to_polygons(rst);
 //        float delta = scaled(std::min(rst.pixel_dimensions().h_mm,
 //                                      rst.pixel_dimensions().w_mm)) / 2;
         
 //        layer_ = expolygons_simplify(layer_, delta);
-        
+
+#ifndef NDEBUG
         SVG svg(objname +  std::to_string(cntr) + ".svg", BoundingBox(Point{0, 0}, Point{scaled(disp_w), scaled(disp_h)}));
         svg.draw(layer_);
         svg.draw(layer, "green");
         svg.Close();
+#endif
         
         double layera = 0., layera_ = 0.;
         for (auto &p : layer) layera += p.area();
         for (auto &p : layer_) layera_ += p.area();
-        
+#ifndef NDEBUG
         std::cout << cntr++ << std::endl;
+#endif
         double diff = std::abs(layera_ - layera);
         REQUIRE((diff <= 0.1 * layera || diff < scaled<double>(1.) * scaled<double>(1.)));