ENH: add top_area_threshold param

Jira: 4136

Signed-off-by: qing.zhang <qing.zhang@bambulab.com>
Change-Id: Ic8a3d05cea769ae92dd5f2f2fcd685d660075c95

src/libslic3r/PerimeterGenerator.cpp

@@ -1018,7 +1018,7 @@ void PerimeterGenerator::process_classic()
                     else
                         offset_top_surface = 0;
                     //don't takes into account too thin areas
-                    double min_width_top_surface = std::max(double(ext_perimeter_spacing / 2 + 10), 1.0 * (double(perimeter_width)));
+                    double min_width_top_surface = (this->object_config->top_area_threshold / 100) * std::max(double(ext_perimeter_spacing / 2 + 10), 1.0 * (double(perimeter_width)));
 
                     //BBS: get boungding box of last
                     BoundingBox last_box   = get_extents(last);
@@ -1408,7 +1408,7 @@ void PerimeterGenerator::process_arachne()
                 infill_contour = diff_ex(infill_contour, bridge_area);
             }
             //BBS: filter small area and extend top surface a bit to hide the wall line
-            double min_width_top_surface = std::max(double(ext_perimeter_spacing / 4 + 10), double(perimeter_width / 4));
+            double min_width_top_surface = (this->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);
 
             //BBS: get the inner surface that not export to top

src/libslic3r/Preset.cpp

@@ -796,7 +796,7 @@ static std::vector<std::string> s_Preset_print_options {
      "detect_narrow_internal_solid_infill",
      "gcode_add_line_number", "enable_arc_fitting", "infill_combination", /*"adaptive_layer_height",*/
      "support_bottom_interface_spacing", "enable_overhang_speed", "overhang_1_4_speed", "overhang_2_4_speed", "overhang_3_4_speed", "overhang_4_4_speed",
-     "initial_layer_infill_speed", "top_one_wall_type", "only_one_wall_first_layer",
+    "initial_layer_infill_speed", "top_one_wall_type", "top_area_threshold", "only_one_wall_first_layer",
      "timelapse_type", "internal_bridge_support_thickness",
      "wall_generator", "wall_transition_length", "wall_transition_filter_deviation", "wall_transition_angle",
      "wall_distribution_count", "min_feature_size", "min_bead_width", "post_process",

src/libslic3r/PrintConfig.cpp

@@ -749,6 +749,15 @@ void PrintConfigDef::init_fff_params()
     def->enum_labels.push_back(L("Topmost surface"));
     def->set_default_value(new ConfigOptionEnum<TopOneWallType>(TopOneWallType::Alltop));
 
+    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    = comDevelop;
+    def->set_default_value(new ConfigOptionPercent(100));
+
     def           = this->add("only_one_wall_first_layer", coBool);
     def->label    = L("Only one wall on first layer");
     def->category = L("Quality");

src/libslic3r/PrintConfig.hpp

@@ -712,6 +712,7 @@ PRINT_CONFIG_CLASS_DEFINE(
     ((ConfigOptionPercent,            min_feature_size))
     ((ConfigOptionPercent,            min_bead_width))
     ((ConfigOptionEnum<TopOneWallType>, top_one_wall_type))
+    ((ConfigOptionPercent,            top_area_threshold))
     ((ConfigOptionBool,               only_one_wall_first_layer))
     // OrcaSlicer
     ((ConfigOptionPercent,            seam_gap))

src/libslic3r/PrintObject.cpp

@@ -710,6 +710,7 @@ bool PrintObject::invalidate_state_by_config_options(
         } else if (
                opt_key == "wall_loops"
             || opt_key == "top_one_wall_type"
+            || opt_key == "top_area_threshold"
             || opt_key == "only_one_wall_first_layer"
             || opt_key == "initial_layer_line_width"
             || opt_key == "inner_wall_line_width"