SuperSlicer/src/libslic3r/Print.hpp

#ifndef slic3r_Print_hpp_
#define slic3r_Print_hpp_

#include "PrintBase.hpp"

#include "BoundingBox.hpp"
#include "ExtrusionEntityCollection.hpp"
#include "Flow.hpp"
#include "Point.hpp"
#include "Slicing.hpp"
#include "Surface.hpp"
#include "GCode/ToolOrdering.hpp"
#include "GCode/WipeTower.hpp"
#include "GCode/ThumbnailData.hpp"
#include "GCode/GCodeProcessor.hpp"

#include "libslic3r.h"

#include <ctime>

namespace Slic3r {

class Print;
class PrintObject;
class ModelObject;
class GCode;
enum class SlicingMode : uint32_t;
class Layer;
class SupportLayer;

namespace FillAdaptive {
    struct Octree;
    struct OctreeDeleter;
    using OctreePtr = std::unique_ptr<Octree, OctreeDeleter>;
};

// Print step IDs for keeping track of the print state.
// The Print steps are applied in this order.
enum PrintStep {
    psWipeTower,
    // Ordering of the tools on PrintObjects for a multi-material print.
    // psToolOrdering is a synonym to psWipeTower, as the Wipe Tower calculates and modifies the ToolOrdering,
    // while if printing without the Wipe Tower, the ToolOrdering is calculated as well.
    psToolOrdering = psWipeTower,
    psSkirt, 
    psBrim,
    // Last step before G-code export, after this step is finished, the initial extrusion path preview
    // should be refreshed.
    psSlicingFinished = psBrim,
    psGCodeExport,
    psCount,
};

enum PrintObjectStep {
    posSlice, posPerimeters, posPrepareInfill,
    posInfill, posIroning, posSupportMaterial, posCount,
};

// A PrintRegion object represents a group of volumes to print
// sharing the same config (including the same assigned extruder(s))
class PrintRegion
{
    friend class Print;

// Methods NOT modifying the PrintRegion's state:
public:
    const Print*                print() const { return m_print; }
    const PrintRegionConfig&    config() const { return m_config; }
	// 1-based extruder identifier for this region and role.
	uint16_t 				    extruder(FlowRole role, const PrintObject& object) const;
    Flow                        flow(FlowRole role, double layer_height, bool bridge, bool first_layer, double width, const PrintObject& object) const;
    float                       width(FlowRole role, bool first_layer, const PrintObject& object) const;
    // Average diameter of nozzles participating on extruding this region.
    coordf_t                    nozzle_dmr_avg(const PrintConfig &print_config) const;
    // Average diameter of nozzles participating on extruding this region.
    coordf_t                    bridging_height_avg(const PrintConfig &print_config) const;

    // Collect 0-based extruder indices used to print this region's object.
	void                        collect_object_printing_extruders(std::set<uint16_t> &object_extruders) const;
	static void                 collect_object_printing_extruders(const PrintConfig &print_config, const PrintObjectConfig &object_config, const PrintRegionConfig &region_config, std::set<uint16_t> &object_extruders);

// Methods modifying the PrintRegion's state:
public:
    Print*                      print() { return m_print; }
    void                        set_config(const PrintRegionConfig &config) { m_config = config; }
    void                        set_config(PrintRegionConfig &&config) { m_config = std::move(config); }
    void                        config_apply_only(const ConfigBase &other, const t_config_option_keys &keys, bool ignore_nonexistent = false) 
                                        { this->m_config.apply_only(other, keys, ignore_nonexistent); }

protected:
    size_t             m_refcnt;

private:
    Print             *m_print;
    PrintRegionConfig  m_config;
    
    //PrintRegion(Print* print) : m_refcnt(0), m_print(print) {}
    PrintRegion(Print* print, const PrintRegionConfig& config) : m_refcnt(0), m_print(print), m_config(config) {}
    ~PrintRegion() = default;
};


typedef std::vector<Layer*> LayerPtrs;
typedef std::vector<SupportLayer*> SupportLayerPtrs;
class BoundingBoxf3;        // TODO: for temporary constructor parameter

// Single instance of a PrintObject.
// As multiple PrintObjects may be generated for a single ModelObject (their instances differ in rotation around Z),
// ModelObject's instancess will be distributed among these multiple PrintObjects.
struct PrintInstance
{
    // Parent PrintObject
    PrintObject 		*print_object;
    // Source ModelInstance of a ModelObject, for which this print_object was created.
	const ModelInstance *model_instance;
	// Shift of this instance's center into the world coordinates.
	Point 				 shift;
};

typedef std::vector<PrintInstance> PrintInstances;

class PrintObject : public PrintObjectBaseWithState<Print, PrintObjectStep, posCount>
{
private: // Prevents erroneous use by other classes.
    typedef PrintObjectBaseWithState<Print, PrintObjectStep, posCount> Inherited;

public:
    // vector of (layer height ranges and vectors of volume ids), indexed by region_id
    std::vector<std::vector<std::pair<t_layer_height_range, int>>> region_volumes;

    // Size of an object: XYZ in scaled coordinates. The size might not be quite snug in XY plane.
    const Vec3crd&          size() const			{ return m_size; }
    const PrintObjectConfig& config() const         { return m_config; }    
    const LayerPtrs&        layers() const          { return m_layers; }
    const SupportLayerPtrs& support_layers() const  { return m_support_layers; }
    const Transform3d&      trafo() const           { return m_trafo; }
    const PrintInstances&   instances() const       { return m_instances; }

    // Bounding box is used to align the object infill patterns, and to calculate attractor for the rear seam.
    // The bounding box may not be quite snug.
    BoundingBox             bounding_box()    const { return BoundingBox(Point(- m_size.x() / 2, - m_size.y() / 2), Point(m_size.x() / 2, m_size.y() / 2)); }
    // Height is used for slicing, for sorting the objects by height for sequential printing and for checking vertical clearence in sequential print mode.
    // The height is snug.
    coord_t 				height() 		  const { return m_size.z(); }
    // Centering offset of the sliced mesh from the scaled and rotated mesh of the model.
    const Point& 			center_offset()   const { return m_center_offset; }

    // adds region_id, too, if necessary
    void add_region_volume(unsigned int region_id, int volume_id, const t_layer_height_range &layer_range) {
        if (region_id >= region_volumes.size())
			region_volumes.resize(region_id + 1);
        region_volumes[region_id].emplace_back(layer_range, volume_id);
    }
    // This is the *total* layer count (including support layers)
    // this value is not supposed to be compared with Layer::id
    // since they have different semantics.
    size_t 			total_layer_count() const { return this->layer_count() + this->support_layer_count(); }
    size_t 			layer_count() const { return m_layers.size(); }
    void 			clear_layers();
    const Layer* 	get_layer(int idx) const { return m_layers[idx]; }
    Layer* 			get_layer(int idx) 		 { return m_layers[idx]; }
    // Get a layer exactly at print_z.
    const Layer*	get_layer_at_printz(coordf_t print_z) const;
    Layer*			get_layer_at_printz(coordf_t print_z);
    // Get a layer approximately at print_z.
    const Layer*	get_layer_at_printz(coordf_t print_z, coordf_t epsilon) const;
    Layer*			get_layer_at_printz(coordf_t print_z, coordf_t epsilon);
    // Get the first layer approximately bellow print_z.
    const Layer*	get_first_layer_bellow_printz(coordf_t print_z, coordf_t epsilon) const;

    // print_z: top of the layer; slice_z: center of the layer.
    Layer* add_layer(int id, coordf_t height, coordf_t print_z, coordf_t slice_z);

    size_t support_layer_count() const { return m_support_layers.size(); }
    void clear_support_layers();
    SupportLayer* get_support_layer(int idx) { return m_support_layers[idx]; }
    SupportLayer* add_support_layer(int id, coordf_t height, coordf_t print_z);
    SupportLayerPtrs::const_iterator insert_support_layer(SupportLayerPtrs::const_iterator pos, size_t id, coordf_t height, coordf_t print_z, coordf_t slice_z);
    void delete_support_layer(int idx);
    
    // Initialize the layer_height_profile from the model_object's layer_height_profile, from model_object's layer height table, or from slicing parameters.
    // Returns true, if the layer_height_profile was changed.
    static bool update_layer_height_profile(const ModelObject &model_object, const SlicingParameters &slicing_parameters, std::vector<coordf_t> &layer_height_profile);

    // Collect the slicing parameters, to be used by variable layer thickness algorithm,
    // by the interactive layer height editor and by the printing process itself.
    // The slicing parameters are dependent on various configuration values
    // (layer height, first layer height, raft settings, print nozzle diameter etc).
    const SlicingParameters&    slicing_parameters() const { return m_slicing_params; }
    static SlicingParameters    slicing_parameters(const DynamicPrintConfig &full_config, const ModelObject &model_object, float object_max_z);

    // returns 0-based indices of extruders used to print the object (without brim, support and other helper extrusions)
    std::set<uint16_t>   object_extruders() const;
    double               get_first_layer_height() const;

    // Called by make_perimeters()
    void slice();

    // Helpers to slice support enforcer / blocker meshes by the support generator.
    std::vector<ExPolygons>     slice_support_volumes(const ModelVolumeType &model_volume_type) const;
    std::vector<ExPolygons>     slice_support_blockers() const { return this->slice_support_volumes(ModelVolumeType::SUPPORT_BLOCKER); }
    std::vector<ExPolygons>     slice_support_enforcers() const { return this->slice_support_volumes(ModelVolumeType::SUPPORT_ENFORCER); }

    // Helpers to project custom facets on slices
    void project_and_append_custom_facets(bool seam, EnforcerBlockerType type, std::vector<ExPolygons>& expolys) const;

    /// skirts if done per copy and not per platter
    const std::optional<ExtrusionEntityCollection>& skirt_first_layer() const { return m_skirt_first_layer; }
    const ExtrusionEntityCollection& skirt() const { return m_skirt; }
    const ExtrusionEntityCollection& brim() const { return m_brim; }

protected:
    // to be called from Print only.
    friend class Print;

	PrintObject(Print* print, ModelObject* model_object, const Transform3d& trafo, PrintInstances&& instances);
	~PrintObject() = default;

    void                    config_apply(const ConfigBase &other, bool ignore_nonexistent = false) { this->m_config.apply(other, ignore_nonexistent); }
    void                    config_apply_only(const ConfigBase &other, const t_config_option_keys &keys, bool ignore_nonexistent = false) { this->m_config.apply_only(other, keys, ignore_nonexistent); }
    PrintBase::ApplyStatus  set_instances(PrintInstances &&instances);
    // Invalidates the step, and its depending steps in PrintObject and Print.
    bool                    invalidate_step(PrintObjectStep step);
    // Invalidates all PrintObject and Print steps.
    bool                    invalidate_all_steps();
    // Invalidate steps based on a set of parameters changed.
    bool                    invalidate_state_by_config_options(const std::vector<t_config_option_key> &opt_keys);
    // If ! m_slicing_params.valid, recalculate.
    void                    update_slicing_parameters();

    static PrintObjectConfig object_config_from_model_object(const PrintObjectConfig &default_object_config, const ModelObject &object, size_t num_extruders);
    static PrintRegionConfig region_config_from_model_volume(const PrintRegionConfig &default_region_config, const DynamicPrintConfig *layer_range_config, const ModelVolume &volume, size_t num_extruders);

private:
    void make_perimeters();
    void prepare_infill();
    void infill();
    void ironing();
    void generate_support_material();

    void _slice(const std::vector<coordf_t> &layer_height_profile);
    ExPolygons _shrink_contour_holes(double contour_delta, double default_delta, double convex_delta, const ExPolygons& input) const;
    ExPolygons _grow_contour_holes(double contour_delta, double default_delta, double convex_delta, const ExPolygons& input) const;
    void _transform_hole_to_polyholes();
    ExPolygons _smooth_curves(const ExPolygons &input, const PrintRegionConfig &conf) const;
    std::string _fix_slicing_errors();
    void simplify_slices(coord_t distance);
    bool has_support_material() const;
    void detect_surfaces_type();
    void process_external_surfaces();
    void discover_vertical_shells();
    void bridge_over_infill();
    void replaceSurfaceType(SurfaceType st_to_replace, SurfaceType st_replacement, SurfaceType st_under_it);
    void clip_fill_surfaces();
    void tag_under_bridge();
    void discover_horizontal_shells();
    void clean_surfaces();
    void combine_infill();
    void _generate_support_material();
    std::pair<FillAdaptive::OctreePtr, FillAdaptive::OctreePtr> prepare_adaptive_infill_data();

    // XYZ in scaled coordinates
    Vec3crd									m_size;
    PrintObjectConfig                       m_config;
    // Translation in Z + Rotation + Scaling / Mirroring.
    Transform3d                             m_trafo = Transform3d::Identity();
    // Slic3r::Point objects in scaled G-code coordinates
    std::vector<PrintInstance>              m_instances;
    // The mesh is being centered before thrown to Clipper, so that the Clipper's fixed coordinates require less bits.
    // This is the adjustment of the  the Object's coordinate system towards PrintObject's coordinate system.
    Point                                   m_center_offset;

    SlicingParameters                       m_slicing_params;
    LayerPtrs                               m_layers;
    SupportLayerPtrs                        m_support_layers;

    // Ordered collections of extrusion paths to build skirt loops and brim.
    // have to be duplicated per copy
    std::optional<ExtrusionEntityCollection> m_skirt_first_layer;
    ExtrusionEntityCollection               m_skirt;
    ExtrusionEntityCollection               m_brim;

    // this is set to true when LayerRegion->slices is split in top/internal/bottom
    // so that next call to make_perimeters() performs a union() before computing loops
    bool                                    m_typed_slices = false;

    std::vector<ExPolygons> slice_region(size_t region_id, const std::vector<float> &z, SlicingMode mode, size_t slicing_mode_normal_below_layer, SlicingMode mode_below) const;
    std::vector<ExPolygons> slice_region(size_t region_id, const std::vector<float> &z, SlicingMode mode) const
        { return this->slice_region(region_id, z, mode, 0, mode); }
    std::vector<ExPolygons> slice_modifiers(size_t region_id, const std::vector<float> &z) const;
    std::vector<ExPolygons> slice_volumes(
        const std::vector<float> &z, 
        SlicingMode mode, size_t slicing_mode_normal_below_layer, SlicingMode mode_below, 
        const std::vector<const ModelVolume*> &volumes) const;
    std::vector<ExPolygons> slice_volumes(const std::vector<float> &z, SlicingMode mode, const std::vector<const ModelVolume*> &volumes) const
        { return this->slice_volumes(z, mode, 0, mode, volumes); }
    std::vector<ExPolygons> slice_volume(const std::vector<float> &z, SlicingMode mode, const ModelVolume &volume) const;
    std::vector<ExPolygons> slice_volume(const std::vector<float> &z, const std::vector<t_layer_height_range> &ranges, SlicingMode mode, const ModelVolume &volume) const;


};

struct WipeTowerData
{
    // Following section will be consumed by the GCodeGenerator.
    // Tool ordering of a non-sequential print has to be known to calculate the wipe tower.
    // Cache it here, so it does not need to be recalculated during the G-code generation.
    ToolOrdering                                         &tool_ordering;
    // Cache of tool changes per print layer.
    std::unique_ptr<std::vector<WipeTower::ToolChangeResult>> priming;
    std::vector<std::vector<WipeTower::ToolChangeResult>> tool_changes;
    std::unique_ptr<WipeTower::ToolChangeResult>          final_purge;
    std::vector<float>                                    used_filament;
    int                                                   number_of_toolchanges;

    // Depth of the wipe tower to pass to GLCanvas3D for exact bounding box:
    float                                                 depth;
    float                                                 brim_width;

    void clear() {
        priming.reset(nullptr);
        tool_changes.clear();
        final_purge.reset(nullptr);
        used_filament.clear();
        number_of_toolchanges = -1;
        depth = 0.f;
        brim_width = 0.f;
    }

private:
	// Only allow the WipeTowerData to be instantiated internally by Print, 
	// as this WipeTowerData shares reference to Print::m_tool_ordering.
	friend class Print;
	WipeTowerData(ToolOrdering &tool_ordering) : tool_ordering(tool_ordering) { clear(); }
	WipeTowerData(const WipeTowerData & /* rhs */) = delete;
	WipeTowerData &operator=(const WipeTowerData & /* rhs */) = delete;
};

struct PrintStatistics
{
    PrintStatistics() { clear(); }
    std::string                     estimated_normal_print_time;
    std::string                     estimated_silent_print_time;
    double                          total_used_filament;
    std::vector<std::pair<size_t, double>> color_extruderid_to_used_filament;
    double                          total_extruded_volume;
    double                          total_cost;
    int                             total_toolchanges;
    double                          total_weight;
    std::vector<std::pair<size_t, double>> color_extruderid_to_used_weight;
    double                          total_wipe_tower_cost;
    double                          total_wipe_tower_filament;
    std::map<size_t, float>         filament_stats;

    // Config with the filled in print statistics.
    DynamicConfig           config() const;
    // Config with the statistics keys populated with placeholder strings.
    static DynamicConfig    placeholders();
    // Replace the print statistics placeholders in the path.
    std::string             finalize_output_path(const std::string &path_in) const;

    void clear() {
        total_used_filament    = 0.;
        total_extruded_volume  = 0.;
        total_cost             = 0.;
        total_toolchanges      = 0;
        total_weight           = 0.;
        total_wipe_tower_cost  = 0.;
        total_wipe_tower_filament = 0.;
        filament_stats.clear();
    }
};

class BrimLoop {
public:
    BrimLoop(const Polygon& p) : lines(Polylines{ p.split_at_first_point() }), is_loop(true) {}
    BrimLoop(const Polyline& l) : lines(Polylines{l}), is_loop(false) {}
    Polylines lines;
    std::vector<BrimLoop> children;
    bool is_loop; // has only one polyline stored and front == back
    Polygon polygon() const{
        assert(is_loop);
        Polygon poly = Polygon(lines.front().points);
        if (poly.points.front() == poly.points.back())
            poly.points.resize(poly.points.size() - 1);
        return poly;
    }
};

typedef std::vector<PrintObject*> PrintObjectPtrs;
typedef std::vector<PrintRegion*> PrintRegionPtrs;

// The complete print tray with possibly multiple objects.
class Print : public PrintBaseWithState<PrintStep, psCount>
{
private: // Prevents erroneous use by other classes.
    typedef PrintBaseWithState<PrintStep, psCount> Inherited;

public:
    //Print() = default;
    Print() {
        //create config hierachy
        m_default_object_config.parent = &m_config;
        m_default_region_config.parent = &m_default_object_config;
    };
	virtual ~Print() { this->clear(); }

	PrinterTechnology	technology() const noexcept override { return ptFFF; }

    // Methods, which change the state of Print / PrintObject / PrintRegion.
    // The following methods are synchronized with process() and export_gcode(),
    // so that process() and export_gcode() may be called from a background thread.
    // In case the following methods need to modify data processed by process() or export_gcode(),
    // a cancellation callback is executed to stop the background processing before the operation.
    void                clear() override;
    bool                empty() const override { return m_objects.empty(); }
    // List of existing PrintObject IDs, to remove notifications for non-existent IDs.
    std::vector<ObjectID> print_object_ids() const override;

    ApplyStatus         apply(const Model &model, DynamicPrintConfig config) override;

    void                process() override;
    // Exports G-code into a file name based on the path_template, returns the file path of the generated G-code file.
    // If preview_data is not null, the preview_data is filled in for the G-code visualization (not used by the command line Slic3r).
    std::string         export_gcode(const std::string& path_template, GCodeProcessor::Result* result, ThumbnailsGeneratorCallback thumbnail_cb = nullptr);

    // methods for handling state
    bool                is_step_done(PrintStep step) const { return Inherited::is_step_done(step); }
    // Returns true if an object step is done on all objects and there's at least one object.    
    bool                is_step_done(PrintObjectStep step) const;
    // Returns true if the last step was finished with success.
    bool                finished() const override { return this->is_step_done(psGCodeExport); }

    bool                has_infinite_skirt() const;
    bool                has_skirt() const;

    // Returns an empty string if valid, otherwise returns an error message.
    std::pair<PrintValidationError, std::string> validate() const override;
    Flow                brim_flow(size_t extruder_id, const PrintObjectConfig &brim_config) const;
    Flow                skirt_flow(size_t extruder_id, bool first_layer=false) const;
    double              get_first_layer_height() const;
    double              get_object_first_layer_height(const PrintObject& object) const;
    
    std::set<uint16_t>  object_extruders(const PrintObjectPtrs &objects) const;
    std::set<uint16_t>  support_material_extruders() const;
    std::set<uint16_t>  extruders() const;
    double              max_allowed_layer_height() const;
    bool                has_support_material() const;
    // Make sure the background processing has no access to this model_object during this call!
    void                auto_assign_extruders(ModelObject* model_object) const;

    const PrintConfig&          config() const { return m_config; }
    const PrintObjectConfig&    default_object_config() const { return m_default_object_config; }
    const PrintRegionConfig&    default_region_config() const { return m_default_region_config; }
    //FIXME returning const vector to non-const PrintObject*, caller could modify PrintObjects!
    const PrintObjectPtrs&      objects() const { return m_objects; }
    PrintObject*                get_object(size_t idx) { return m_objects[idx]; }
    const PrintObject*          get_object(size_t idx) const { return m_objects[idx]; }
    // PrintObject by its ObjectID, to be used to uniquely bind slicing warnings to their source PrintObjects
    // in the notification center.
    const PrintObject*          get_object(ObjectID object_id) const { 
        auto it = std::find_if(m_objects.begin(), m_objects.end(), 
            [object_id](const PrintObject *obj) { return obj->id() == object_id; });
        return (it == m_objects.end()) ? nullptr : *it;
    }
    const PrintRegionPtrs&      regions() const { return m_regions; }
    // How many of PrintObject::copies() over all print objects are there?
    // If zero, then the print is empty and the print shall not be executed.
    uint16_t                    num_object_instances() const;

    const std::optional<ExtrusionEntityCollection>& skirt_first_layer() const { return m_skirt_first_layer; }
    const ExtrusionEntityCollection& skirt() const { return m_skirt; }
    const ExtrusionEntityCollection& brim() const { return m_brim; }
    // Convex hull of the 1st layer extrusions, for bed leveling and placing the initial purge line.
    // It encompasses the object extrusions, support extrusions, skirt, brim, wipe tower.
    // It does NOT encompass user extrusions generated by custom G-code,
    // therefore it does NOT encompass the initial purge line.
    // It does NOT encompass MMU/MMU2 starting (wipe) areas.
    const Polygon&                   first_layer_convex_hull() const { return m_first_layer_convex_hull; }

    const PrintStatistics&      print_statistics() const { return m_print_statistics; }
    PrintStatistics&            print_statistics() { return m_print_statistics; }
    std::time_t                 timestamp_last_change() const { return m_timestamp_last_change; }


    // Wipe tower support.
    bool                        has_wipe_tower() const;
    const WipeTowerData&        wipe_tower_data(size_t extruders_cnt = 0, double first_layer_height = 0., double nozzle_diameter = 0.) const;
    const ToolOrdering& 		tool_ordering() const { return m_tool_ordering; }

	std::string                 output_filename(const std::string &filename_base = std::string()) const override;

    // Accessed by SupportMaterial
    const PrintRegion*  get_region(size_t idx) const  { return m_regions[idx]; }
    const ToolOrdering& get_tool_ordering() const { return m_wipe_tower_data.tool_ordering; }   // #ys_FIXME just for testing

    //put this in public to be accessible for tests, it was in private before.
    bool                invalidate_state_by_config_options(const std::vector<t_config_option_key> &opt_keys);

    // Invalidates the step, and its depending steps in Print.
    //in public to invalidate gcode when the physical printer change. It's needed if we allow the gcode macro to read these values.
    bool                invalidate_step(PrintStep step);
protected:
    // methods for handling regions
    PrintRegion*        get_region(size_t idx)        { return m_regions[idx]; }
    //PrintRegion*        add_region();
    PrintRegion*        add_region(const PrintRegionConfig &config);

private:
	void 				config_diffs(
		const DynamicPrintConfig &new_full_config, 
		t_config_option_keys &print_diff, t_config_option_keys &object_diff, t_config_option_keys &region_diff, 
		t_config_option_keys &full_config_diff, 
		DynamicPrintConfig &filament_overrides) const;

    void                _make_skirt(const PrintObjectPtrs &objects, ExtrusionEntityCollection &out, std::optional<ExtrusionEntityCollection> &out_first_layer);
    void                _make_brim(const Flow &flow, const PrintObjectPtrs &objects, ExPolygons &unbrimmable, ExtrusionEntityCollection &out);
    void                _make_brim_ears(const Flow &flow, const PrintObjectPtrs &objects, ExPolygons &unbrimmable, ExtrusionEntityCollection &out);
    void                _make_brim_interior(const Flow &flow, const PrintObjectPtrs &objects, ExPolygons &unbrimmable, ExtrusionEntityCollection &out);
    void                _extrude_brim_from_tree(std::vector<std::vector<BrimLoop>> &loops, const Polygons &frontiers, const Flow &flow, ExtrusionEntityCollection &out, bool reversed = false);
    Polylines           _reorder_brim_polyline(Polylines lines, ExtrusionEntityCollection &out, const Flow &flow);
    void                _make_wipe_tower();
    void                finalize_first_layer_convex_hull();

    // Islands of objects and their supports extruded at the 1st layer.
    Polygons            first_layer_islands() const;
    // Return 4 wipe tower corners in the world coordinates (shifted and rotated), including the wipe tower brim.
    std::vector<Point>  first_layer_wipe_tower_corners() const;

    // Declared here to have access to Model / ModelObject / ModelInstance
    static void         model_volume_list_update_supports_seams(ModelObject &model_object_dst, const ModelObject &model_object_src);

    PrintConfig                             m_config;
    PrintObjectConfig                       m_default_object_config;
    PrintRegionConfig                       m_default_region_config;
    PrintObjectPtrs                         m_objects;
    PrintRegionPtrs                         m_regions;

    // Ordered collections of extrusion paths to build skirt loops and brim.
    std::optional<ExtrusionEntityCollection> m_skirt_first_layer;
    ExtrusionEntityCollection               m_skirt;
    ExtrusionEntityCollection               m_brim;
    // Convex hull of the 1st layer extrusions.
    // It encompasses the object extrusions, support extrusions, skirt, brim, wipe tower.
    // It does NOT encompass user extrusions generated by custom G-code,
    // therefore it does NOT encompass the initial purge line.
    // It does NOT encompass MMU/MMU2 starting (wipe) areas.
    Polygon                                 m_first_layer_convex_hull;
    Points                                  m_skirt_convex_hull;

    // Following section will be consumed by the GCodeGenerator.
    ToolOrdering 							m_tool_ordering;
    WipeTowerData                           m_wipe_tower_data {m_tool_ordering};

    // Estimated print time, filament consumed.
    PrintStatistics                         m_print_statistics;
    // tiem of last change, to see if the gui need to be updated
    std::time_t                             m_timestamp_last_change;

    // To allow GCode to set the Print's GCodeExport step status.
    friend class GCode;
    // Allow PrintObject to access m_mutex and m_cancel_callback.
    friend class PrintObject;
};

//for testing purpose
ExPolygons dense_fill_fit_to_size(const ExPolygon &polygon_to_cover, const ExPolygons& allowedPoints,
    const ExPolygon& growing_area, const coord_t offset, float coverage);

} /* slic3r_Print_hpp_ */

#endif