SLA supports - first attempt at supporting islands

src/libslic3r/SLAPrint.hpp

@@ -18,7 +18,6 @@ enum SLAPrintStep : unsigned int {
 
 enum SLAPrintObjectStep : unsigned int {
 	slaposObjectSlice,
-	slaposSupportIslands,
 	slaposSupportPoints,
 	slaposSupportTree,
 	slaposBasePool,
@@ -226,6 +225,8 @@ private:
             lref(std::cref(lyr)), copies(std::cref(cp)) {}
     };
 
+    std::vector<float> calculate_heights(const BoundingBoxf3& bb, float elevation, float initial_layer_height, float layer_height) const;
+
     // One level may contain multiple slices from multiple objects and their
     // supports
     using LayerRefs = std::vector<LayerRef>;