Moved C++ code into new libslic3r directory

xs/src/libslic3r/LayerRegion.cpp

@@ -0,0 +1,45 @@
+#include "Layer.hpp"
+#include "Print.hpp"
+
+namespace Slic3r {
+
+LayerRegion::LayerRegion(Layer *layer, PrintRegion *region)
+:   _layer(layer),
+    _region(region)
+{
+}
+
+LayerRegion::~LayerRegion()
+{
+}
+
+Layer*
+LayerRegion::layer()
+{
+    return this->_layer;
+}
+
+PrintRegion*
+LayerRegion::region()
+{
+    return this->_region;
+}
+
+Flow
+LayerRegion::flow(FlowRole role, bool bridge, double width) const
+{
+    return this->_region->flow(
+        role,
+        this->_layer->height,
+        bridge,
+        this->_layer->id() == 0,
+        width,
+        *this->_layer->object()
+    );
+}
+
+#ifdef SLIC3RXS
+REGISTER_CLASS(LayerRegion, "Layer::Region");
+#endif
+
+}