Ported LayerRegion::make_slices() to XS

xs/src/libslic3r/Layer.hpp

@@ -52,6 +52,7 @@ class LayerRegion
     ExtrusionEntityCollection fills;
     
     Flow flow(FlowRole role, bool bridge = false, double width = -1) const;
+    void merge_slices();
     
     private:
     Layer *_layer;

xs/src/libslic3r/LayerRegion.cpp

@@ -1,5 +1,7 @@
 #include "Layer.hpp"
+#include "ClipperUtils.hpp"
 #include "Print.hpp"
+#include "Surface.hpp"
 
 namespace Slic3r {
 
@@ -38,6 +40,18 @@ LayerRegion::flow(FlowRole role, bool bridge, double width) const
     );
 }
 
+void
+LayerRegion::merge_slices()
+{
+    ExPolygons expp;
+    union_(this->slices, expp);
+    this->slices.surfaces.clear();
+    this->slices.surfaces.reserve(expp.size());
+    
+    for (ExPolygons::const_iterator expoly = expp.begin(); expoly != expp.end(); ++expoly)
+        this->slices.surfaces.push_back(Surface(stInternal, *expoly));
+}
+
 #ifdef SLIC3RXS
 REGISTER_CLASS(LayerRegion, "Layer::Region");
 #endif

xs/src/libslic3r/Surface.hpp

@@ -10,12 +10,17 @@ enum SurfaceType { stTop, stBottom, stBottomBridge, stInternal, stInternalSolid,
 class Surface
 {
     public:
-    ExPolygon       expolygon;
     SurfaceType     surface_type;
+    ExPolygon       expolygon;
     double          thickness;          // in mm
     unsigned short  thickness_layers;   // in layers
     double          bridge_angle;       // in radians, ccw, 0 = East, only 0+ (negative means undefined)
     unsigned short  extra_perimeters;
+    
+    Surface(SurfaceType _surface_type, const ExPolygon &_expolygon)
+        : surface_type(_surface_type), expolygon(_expolygon),
+            thickness(-1), thickness_layers(1), bridge_angle(-1), extra_perimeters(0)
+        {};
     double area() const;
     bool is_solid() const;
     bool is_external() const;