Implement clone() for Fill classes

xs/MANIFEST

@@ -57,6 +57,7 @@ src/libslic3r/IO.hpp
 src/libslic3r/Layer.cpp
 src/libslic3r/Layer.hpp
 src/libslic3r/LayerRegion.cpp
+src/libslic3r/LayerRegionFill.cpp
 src/libslic3r/libslic3r.h
 src/libslic3r/Line.cpp
 src/libslic3r/Line.hpp

xs/src/libslic3r/Fill/Fill.hpp

@@ -62,7 +62,8 @@ public:
     static Fill* new_from_type(const InfillPattern type);
     static Fill* new_from_type(const std::string &type);
     static coord_t adjust_solid_spacing(const coord_t width, const coord_t distance);
-
+    virtual Fill* clone() const = 0;
+    
     // Implementations can override the following virtual methods:
     // Use bridge flow for the fill?
     virtual bool use_bridge_flow() const { return false; }
@@ -86,6 +87,7 @@ protected:
         dont_adjust(false),
         complete(false)
         {};
+    virtual ~Fill();
     
     // The expolygon may be modified by the method to avoid a copy.
     virtual void _fill_surface_single(

xs/src/libslic3r/Fill/Fill3DHoneycomb.hpp

@@ -12,6 +12,7 @@ namespace Slic3r {
 class Fill3DHoneycomb : public Fill
 {
 public:
+    virtual Fill* clone() const { return new Fill3DHoneycomb(*this); };
     virtual ~Fill3DHoneycomb() {}
 
 	// require bridge flow since most of this pattern hangs in air

xs/src/libslic3r/Fill/FillConcentric.hpp

@@ -11,6 +11,7 @@ public:
     virtual ~FillConcentric() {}
 
 protected:
+    virtual Fill* clone() const { return new FillConcentric(*this); };
 	virtual void _fill_surface_single(
 	    unsigned int                     thickness_layers,
 	    const std::pair<float, Point>   &direction, 

xs/src/libslic3r/Fill/FillHoneycomb.hpp

@@ -15,6 +15,7 @@ public:
     virtual ~FillHoneycomb() {}
 
 protected:
+    virtual Fill* clone() const { return new FillHoneycomb(*this); };
 	virtual void _fill_surface_single(
 	    unsigned int                     thickness_layers,
 	    const std::pair<float, Point>   &direction, 

xs/src/libslic3r/Fill/FillPlanePath.hpp

@@ -33,6 +33,7 @@ protected:
 class FillArchimedeanChords : public FillPlanePath
 {
 public:
+    virtual Fill* clone() const { return new FillArchimedeanChords(*this); };
     virtual ~FillArchimedeanChords() {}
 
 protected:
@@ -43,6 +44,7 @@ protected:
 class FillHilbertCurve : public FillPlanePath
 {
 public:
+    virtual Fill* clone() const { return new FillHilbertCurve(*this); };
     virtual ~FillHilbertCurve() {}
 
 protected:
@@ -53,6 +55,7 @@ protected:
 class FillOctagramSpiral : public FillPlanePath
 {
 public:
+    virtual Fill* clone() const { return new FillOctagramSpiral(*this); };
     virtual ~FillOctagramSpiral() {}
 
 protected:

xs/src/libslic3r/Fill/FillRectilinear.hpp

@@ -10,6 +10,7 @@ namespace Slic3r {
 class FillRectilinear : public Fill
 {
 public:
+    virtual Fill* clone() const { return new FillRectilinear(*this); };
     virtual ~FillRectilinear() {}
 
 protected:

xs/src/libslic3r/Fill/FillRectilinear2.hpp

@@ -12,6 +12,7 @@ class Surface;
 class FillRectilinear2 : public Fill
 {
 public:
+    virtual Fill* clone() const { return new FillRectilinear2(*this); };
     virtual ~FillRectilinear2() {}
     virtual Polylines fill_surface(const Surface &surface);
 
@@ -22,6 +23,7 @@ protected:
 class FillGrid2 : public FillRectilinear2
 {
 public:
+    virtual Fill* clone() const { return new FillGrid2(*this); };
     virtual ~FillGrid2() {}
     virtual Polylines fill_surface(const Surface &surface);
 
@@ -33,6 +35,7 @@ protected:
 class FillTriangles : public FillRectilinear2
 {
 public:
+    virtual Fill* clone() const { return new FillTriangles(*this); };
     virtual ~FillTriangles() {}
     virtual Polylines fill_surface(const Surface &surface);
 
@@ -44,6 +47,7 @@ protected:
 class FillStars : public FillRectilinear2
 {
 public:
+    virtual Fill* clone() const { return new FillStars(*this); };
     virtual ~FillStars() {}
     virtual Polylines fill_surface(const Surface &surface);
 
@@ -55,6 +59,7 @@ protected:
 class FillCubic : public FillRectilinear2
 {
 public:
+    virtual Fill* clone() const { return new FillCubic(*this); };
     virtual ~FillCubic() {}
     virtual Polylines fill_surface(const Surface &surface);