add top area threshold

src/libslic3r/PerimeterGenerator.cpp

@@ -1302,9 +1302,14 @@ void PerimeterGenerator::process_arachne(
         out_loops.append(extrusion_coll);
 
     ExPolygons    infill_contour = union_ex(wallToolPaths.getInnerContour());
+    //w17
     const coord_t spacing        = (perimeters.size() == 1) ? ext_perimeter_spacing2 : perimeter_spacing;
     if (offset_ex(infill_contour, -float(spacing / 2.)).empty())
         infill_contour.clear(); // Infill region is too small, so let's filter it out.
+    coord_t perimeter_width       = params.perimeter_flow.scaled_width();
+    double min_width_top_surface = (params.object_config.top_area_threshold / 100) *
+                                   std::max(double(ext_perimeter_spacing / 4 + 10), double(perimeter_width / 4));
+    infill_contour = offset2_ex(infill_contour, -min_width_top_surface, min_width_top_surface + perimeter_width);
 
     // create one more offset to be used as boundary for fill
     // we offset by half the perimeter spacing (to get to the actual infill boundary)
@@ -1440,7 +1445,8 @@ void PerimeterGenerator::process_with_one_wall_arachne(
                                                std::max(ext_perimeter_spacing, perimeter_width));
             infill_contour         = diff_ex(infill_contour, bridge_area);
         }
-        double min_width_top_surface = std::max(double(ext_perimeter_spacing / 4 + 10), double(perimeter_width / 4));
+        //w17
+        double min_width_top_surface = (params.object_config.top_area_threshold / 100) * std::max(double(ext_perimeter_spacing / 4 + 10), double(perimeter_width / 4));
         infill_contour = offset2_ex(infill_contour, -min_width_top_surface, min_width_top_surface + perimeter_width);
 
         ExPolygons surface_not_export_to_top = diff_ex(the_layer_surface, infill_contour);
@@ -1891,7 +1897,8 @@ void PerimeterGenerator::process_classic(
                         0.9 * (params.config.perimeters.value <= 1 ? 0. : (perimeter_spacing * (params.config.perimeters.value - 1))));
                 else
                     offset_top_surface = 0;
-                double min_width_top_surface = (100) *
+                //w17
+                double min_width_top_surface = (params.object_config.top_area_threshold/100 ) *
                                                std::max(double(ext_perimeter_spacing / 2 + 10), 1.0 * (double(perimeter_width)));
                 BoundingBox last_box = get_extents(last);
                 last_box.offset(SCALED_EPSILON);

src/libslic3r/Preset.cpp

@@ -477,6 +477,8 @@ static std::vector<std::string> s_Preset_print_options {
     ,"seam_gap"
     //w16
     , "top_one_wall_type"
+    //w17
+    ,"top_area_threshold"
 };
 
 static std::vector<std::string> s_Preset_filament_options {

src/libslic3r/PrintConfig.cpp

@@ -3550,6 +3550,16 @@ void PrintConfigDef::init_fff_params()
     def->mode = comAdvanced;
     def->set_default_value(new ConfigOptionEnum<TopOneWallType>(TopOneWallType::Alltop));
 
+    //w17
+    def           = this->add("top_area_threshold", coPercent);
+    def->label    = L("Top area threshold");
+    def->tooltip  = L("This factor affects the acreage of top area. The small the number the big the top area.");
+    def->sidetext = L("%");
+    def->min      = 0;
+    def->max      = 500;
+    def->mode     = comAdvanced;
+    def->set_default_value(new ConfigOptionPercent(100));
+
     def = this->add("wall_transition_length", coFloatOrPercent);
     def->label = L("Perimeter transition length");
     def->category = L("Advanced");

src/libslic3r/PrintConfig.hpp

@@ -592,6 +592,8 @@ PRINT_CONFIG_CLASS_DEFINE(
     ((ConfigOptionBool,                detect_narrow_internal_solid_infill))
     //w16
     ((ConfigOptionEnum<TopOneWallType>, top_one_wall_type))
+    //w17
+    ((ConfigOptionPercent,            top_area_threshold))
 )
 
 PRINT_CONFIG_CLASS_DEFINE(

src/libslic3r/PrintObject.cpp

@@ -865,8 +865,10 @@ bool PrintObject::invalidate_state_by_config_options(
             || opt_key == "wall_distribution_count"
             || opt_key == "min_feature_size"
             || opt_key == "min_bead_width"
-            //w15
-            || opt_key == "top_one_wall_type"){
+            //w16
+            || opt_key == "top_one_wall_type"
+            //w17
+            || opt_key == "top_area_threshold") {
             steps.emplace_back(posSlice);
         } else if (
                opt_key == "seam_position"

src/slic3r/GUI/Tab.cpp

@@ -1469,6 +1469,8 @@ void TabPrint::build()
         optgroup->append_single_option_line("perimeter_generator");
         //w16
         optgroup->append_single_option_line("top_one_wall_type");
+        //w17
+        optgroup->append_single_option_line("top_area_threshold");
 
         optgroup = page->new_optgroup(L("Fuzzy skin (experimental)"));
         category_path = "fuzzy-skin_246186/#";