WIP: Moved sources int src/, separated most of the source code from Perl.

The XS was left only for the unit / integration tests, and it links
libslic3r only. No wxWidgets are allowed to be used from Perl starting
from now.

src/libslic3r/ExtrusionEntityCollection.hpp

@@ -0,0 +1,108 @@
+#ifndef slic3r_ExtrusionEntityCollection_hpp_
+#define slic3r_ExtrusionEntityCollection_hpp_
+
+#include "libslic3r.h"
+#include "ExtrusionEntity.hpp"
+
+namespace Slic3r {
+
+class ExtrusionEntityCollection : public ExtrusionEntity
+{
+public:
+    ExtrusionEntityCollection* clone() const;
+    ExtrusionEntitiesPtr entities;     // we own these entities
+    std::vector<size_t> orig_indices;  // handy for XS
+    bool no_sort;
+    ExtrusionEntityCollection(): no_sort(false) {};
+    ExtrusionEntityCollection(const ExtrusionEntityCollection &other) : orig_indices(other.orig_indices), no_sort(other.no_sort) { this->append(other.entities); }
+    ExtrusionEntityCollection(ExtrusionEntityCollection &&other) : entities(std::move(other.entities)), orig_indices(std::move(other.orig_indices)), no_sort(other.no_sort) {}
+    explicit ExtrusionEntityCollection(const ExtrusionPaths &paths);
+    ExtrusionEntityCollection& operator=(const ExtrusionEntityCollection &other);
+    ExtrusionEntityCollection& operator=(ExtrusionEntityCollection &&other) 
+        { this->entities = std::move(other.entities); this->orig_indices = std::move(other.orig_indices); this->no_sort = other.no_sort; return *this; }
+    ~ExtrusionEntityCollection() { clear(); }
+    explicit operator ExtrusionPaths() const;
+    
+    bool is_collection() const { return true; };
+    ExtrusionRole role() const override {
+        ExtrusionRole out = erNone;
+        for (const ExtrusionEntity *ee : entities) {
+            ExtrusionRole er = ee->role();
+            out = (out == erNone || out == er) ? er : erMixed;
+        }
+        return out;
+    }
+    bool can_reverse() const { return !this->no_sort; };
+    bool empty() const { return this->entities.empty(); };
+    void clear();
+    void swap (ExtrusionEntityCollection &c);
+    void append(const ExtrusionEntity &entity) { this->entities.push_back(entity.clone()); }
+    void append(const ExtrusionEntitiesPtr &entities) { 
+        this->entities.reserve(this->entities.size() + entities.size());
+        for (ExtrusionEntitiesPtr::const_iterator ptr = entities.begin(); ptr != entities.end(); ++ptr)
+            this->entities.push_back((*ptr)->clone());
+    }
+    void append(ExtrusionEntitiesPtr &&src) {
+        if (entities.empty())
+            entities = std::move(src);
+        else {
+            std::move(std::begin(src), std::end(src), std::back_inserter(entities));
+            src.clear();
+        }
+    }
+    void append(const ExtrusionPaths &paths) {
+        this->entities.reserve(this->entities.size() + paths.size());
+        for (const ExtrusionPath &path : paths)
+            this->entities.emplace_back(path.clone());
+    }
+    void append(ExtrusionPaths &&paths) {
+        this->entities.reserve(this->entities.size() + paths.size());
+        for (ExtrusionPath &path : paths)
+            this->entities.emplace_back(new ExtrusionPath(std::move(path)));
+    }
+    void replace(size_t i, const ExtrusionEntity &entity);
+    void remove(size_t i);
+    ExtrusionEntityCollection chained_path(bool no_reverse = false, ExtrusionRole role = erMixed) const;
+    void chained_path(ExtrusionEntityCollection* retval, bool no_reverse = false, ExtrusionRole role = erMixed, std::vector<size_t>* orig_indices = nullptr) const;
+    ExtrusionEntityCollection chained_path_from(Point start_near, bool no_reverse = false, ExtrusionRole role = erMixed) const;
+    void chained_path_from(Point start_near, ExtrusionEntityCollection* retval, bool no_reverse = false, ExtrusionRole role = erMixed, std::vector<size_t>* orig_indices = nullptr) const;
+    void reverse();
+    Point first_point() const { return this->entities.front()->first_point(); }
+    Point last_point() const { return this->entities.back()->last_point(); }
+    // Produce a list of 2D polygons covered by the extruded paths, offsetted by the extrusion width.
+    // Increase the offset by scaled_epsilon to achieve an overlap, so a union will produce no gaps.
+    void polygons_covered_by_width(Polygons &out, const float scaled_epsilon) const override;
+    // Produce a list of 2D polygons covered by the extruded paths, offsetted by the extrusion spacing.
+    // Increase the offset by scaled_epsilon to achieve an overlap, so a union will produce no gaps.
+    // Useful to calculate area of an infill, which has been really filled in by a 100% rectilinear infill.
+    void polygons_covered_by_spacing(Polygons &out, const float scaled_epsilon) const override;
+    Polygons polygons_covered_by_width(const float scaled_epsilon = 0.f) const
+        { Polygons out; this->polygons_covered_by_width(out, scaled_epsilon); return out; }
+    Polygons polygons_covered_by_spacing(const float scaled_epsilon = 0.f) const
+        { Polygons out; this->polygons_covered_by_spacing(out, scaled_epsilon); return out; }
+    size_t items_count() const;
+    void flatten(ExtrusionEntityCollection* retval) const;
+    ExtrusionEntityCollection flatten() const;
+    double min_mm3_per_mm() const;
+    double total_volume() const override { double volume=0.; for (const auto& ent : entities) volume+=ent->total_volume(); return volume; }
+
+    // Following methods shall never be called on an ExtrusionEntityCollection.
+    Polyline as_polyline() const {
+        throw std::runtime_error("Calling as_polyline() on a ExtrusionEntityCollection");
+        return Polyline();
+    };
+
+    void collect_polylines(Polylines &dst) const override {
+        for (ExtrusionEntity* extrusion_entity : this->entities)
+            extrusion_entity->collect_polylines(dst);
+    }
+
+    double length() const override {
+        throw std::runtime_error("Calling length() on a ExtrusionEntityCollection");
+        return 0.;        
+    }
+};
+
+}
+
+#endif