Upgrade to Wagyu 0.4.3

mapbox/geometry/wagyu/active_bound_list.hpp

@@ -19,7 +19,7 @@ namespace geometry {
 namespace wagyu {
 
 template <typename T>
-using active_bound_list = std::list<bound_ptr<T>>;
+using active_bound_list = std::vector<bound_ptr<T>>;
 
 template <typename T>
 using active_bound_list_itr = typename active_bound_list<T>::iterator;
@@ -83,37 +83,36 @@ bool is_even_odd_alt_fill_type(bound<T> const& bound,
 }
 
 template <typename T>
-inline bool bound2_inserts_before_bound1(bound<T> const& bound1, bound<T> const& bound2) {
+struct bound_insert_location {
+
+    bound<T> const& bound2;
+
+    bound_insert_location(bound<T> const& b) : bound2(b) {
+    }
+
+    bool operator()(bound_ptr<T> const& b) {
+        auto const& bound1 = *b;
         if (values_are_equal(bound2.current_x, bound1.current_x)) {
             if (bound2.current_edge->top.y > bound1.current_edge->top.y) {
-            return bound2.current_edge->top.x <
+                return static_cast<double>(bound2.current_edge->top.x) <
                        get_current_x(*(bound1.current_edge), bound2.current_edge->top.y);
             } else {
-            return bound1.current_edge->top.x >
+                return static_cast<double>(bound1.current_edge->top.x) >
                        get_current_x(*(bound2.current_edge), bound1.current_edge->top.y);
             }
         } else {
             return bound2.current_x < bound1.current_x;
         }
     }
+};
 
 template <typename T>
-active_bound_list_itr<T> insert_bound_into_ABL(bound<T>& bnd, active_bound_list<T>& active_bounds) {
+active_bound_list_itr<T>
-    auto itr = active_bounds.begin();
+insert_bound_into_ABL(bound<T>& left, bound<T>& right, active_bound_list<T>& active_bounds) {
-    while (itr != active_bounds.end() && !bound2_inserts_before_bound1(*(*itr), bnd)) {
-        ++itr;
-    }
-    return active_bounds.insert(itr, &bnd);
-}
 
-template <typename T>
+    auto itr =
-active_bound_list_itr<T> insert_bound_into_ABL(bound<T>& bnd,
+        std::find_if(active_bounds.begin(), active_bounds.end(), bound_insert_location<T>(left));
-                                               active_bound_list_itr<T> itr,
+    return active_bounds.insert(itr, { &left, &right });
-                                               active_bound_list<T>& active_bounds) {
-    while (itr != active_bounds.end() && !bound2_inserts_before_bound1(*(*itr), bnd)) {
-        ++itr;
-    }
-    return active_bounds.insert(itr, &bnd);
 }
 
 template <typename T>
@@ -147,39 +146,23 @@ inline bool next_edge_is_horizontal(active_bound_list_itr<T>& bnd) {
 }
 
 template <typename T>
-inline void swap_positions_in_ABL(active_bound_list_itr<T>& bnd1,
+void next_edge_in_bound(bound<T>& bnd, scanbeam_list<T>& scanbeam) {
-                                  active_bound_list_itr<T>& bnd2,
+    auto& current_edge = bnd.current_edge;
-                                  active_bound_list<T>& active_bounds) {
+    ++current_edge;
-    if (std::next(bnd2) == bnd1) {
+    if (current_edge != bnd.edges.end()) {
-        active_bounds.splice(bnd2, active_bounds, bnd1);
+        ++(bnd.next_edge);
-    } else {
+        bnd.current_x = static_cast<double>(current_edge->bot.x);
-        active_bounds.splice(bnd1, active_bounds, bnd2);
+        if (!is_horizontal<T>(*current_edge)) {
-    }
+            scanbeam.push_back(current_edge->top.y);
-}
-
-template <typename T>
-void next_edge_in_bound(active_bound_list_itr<T>& bnd, scanbeam_list<T>& scanbeam) {
-    ++((*bnd)->current_edge);
-    if ((*bnd)->current_edge != (*bnd)->edges.end()) {
-        ++((*bnd)->next_edge);
-        (*bnd)->current_x = static_cast<double>((*bnd)->current_edge->bot.x);
-        if (!current_edge_is_horizontal<T>(bnd)) {
-            scanbeam.push((*bnd)->current_edge->top.y);
         }
     }
 }
 
 template <typename T>
-active_bound_list_itr<T> get_maxima_pair(active_bound_list_itr<T> bnd,
+active_bound_list_itr<T> get_maxima_pair(active_bound_list_itr<T> const& bnd,
                                          active_bound_list<T>& active_bounds) {
-    auto bnd_itr = active_bounds.begin();
+    bound_ptr<T> maximum = (*bnd)->maximum_bound;
-    while (bnd_itr != active_bounds.end()) {
+    return std::find(active_bounds.begin(), active_bounds.end(), maximum);
-        if (*bnd_itr == (*bnd)->maximum_bound) {
-            break;
-        }
-        ++bnd_itr;
-    }
-    return bnd_itr;
 }
 
 template <typename T>
@@ -247,9 +230,7 @@ void set_winding_count(active_bound_list_itr<T>& bnd_itr,
     if (is_even_odd_alt_fill_type(*(*bnd_itr), subject_fill_type, clip_fill_type)) {
         // EvenOdd filling ...
         while (bnd_itr_forward != bnd_itr) {
-            if ((*bnd_itr_forward)->winding_delta != 0) {
             (*bnd_itr)->winding_count2 = ((*bnd_itr)->winding_count2 == 0 ? 1 : 0);
-            }
             ++bnd_itr_forward;
         }
     } else {
@@ -362,21 +343,21 @@ void insert_lm_left_and_right_bound(bound<T>& left_bound,
                                     fill_type clip_fill_type) {
 
     // Both left and right bound
-    auto lb_abl_itr = insert_bound_into_ABL(left_bound, active_bounds);
+    auto lb_abl_itr = insert_bound_into_ABL(left_bound, right_bound, active_bounds);
-    auto rb_abl_itr = active_bounds.insert(std::next(lb_abl_itr), &right_bound);
+    auto rb_abl_itr = std::next(lb_abl_itr);
     set_winding_count(lb_abl_itr, active_bounds, subject_fill_type, clip_fill_type);
     (*rb_abl_itr)->winding_count = (*lb_abl_itr)->winding_count;
     (*rb_abl_itr)->winding_count2 = (*lb_abl_itr)->winding_count2;
     if (is_contributing(left_bound, cliptype, subject_fill_type, clip_fill_type)) {
-        add_local_minimum_point(lb_abl_itr, rb_abl_itr, active_bounds,
+        add_local_minimum_point(*(*lb_abl_itr), *(*rb_abl_itr), active_bounds,
                                 (*lb_abl_itr)->current_edge->bot, rings);
     }
 
     // Add top of edges to scanbeam
-    scanbeam.push((*lb_abl_itr)->current_edge->top.y);
+    scanbeam.push_back((*lb_abl_itr)->current_edge->top.y);
 
     if (!current_edge_is_horizontal<T>(rb_abl_itr)) {
-        scanbeam.push((*rb_abl_itr)->current_edge->top.y);
+        scanbeam.push_back((*rb_abl_itr)->current_edge->top.y);
     }
 }
 

mapbox/geometry/wagyu/bound.hpp

@@ -64,6 +64,10 @@ struct bound {
           poly_type(std::move(b.poly_type)),
           side(std::move(b.side)) {
     }
+
+    bound(bound<T>const& b) = delete;
+    bound<T>& operator=(bound<T> const&) = delete;
+
 };
 
 #ifdef DEBUG

mapbox/geometry/wagyu/bubble_sort.hpp

@@ -0,0 +1,28 @@
+#pragma once
+
+namespace mapbox {
+namespace geometry {
+namespace wagyu {
+
+template <typename It, class Compare, class MethodOnSwap>
+void bubble_sort(It begin, It end, Compare c, MethodOnSwap m) {
+    if (begin == end) {
+        return;
+    }
+    bool modified = false;
+    auto last = end - 1;
+    do {
+        modified = false;
+        for (auto itr = begin; itr != last; ++itr) {
+            auto next = std::next(itr);
+            if (!c(*itr, *next)) {
+                m(*itr, *next);
+                std::iter_swap(itr, next);
+                modified = true;
+            }
+        }
+    } while (modified);
+}
+}
+}
+}

mapbox/geometry/wagyu/build_edges.hpp

@@ -25,8 +25,8 @@ bool point_2_is_between_point_1_and_point_3(mapbox::geometry::point<T> const& pt
     }
 }
 
-template <typename T>
+template <typename T1, typename T2>
-bool build_edge_list(mapbox::geometry::linear_ring<T> const& path_geometry, edge_list<T>& edges) {
+bool build_edge_list(mapbox::geometry::linear_ring<T2> const& path_geometry, edge_list<T1>& edges) {
 
     if (path_geometry.size() < 3) {
         return false;
@@ -37,8 +37,8 @@ bool build_edge_list(mapbox::geometry::linear_ring<T> const& path_geometry, edge
 
     auto itr_rev = path_geometry.rbegin();
     auto itr = path_geometry.begin();
-    mapbox::geometry::point<T> pt1 = *itr_rev;
+    mapbox::geometry::point<T2> pt1 = *itr_rev;
-    mapbox::geometry::point<T> pt2 = *itr;
+    mapbox::geometry::point<T2> pt2 = *itr;
 
     // Find next non repeated point going backwards from
     // end for pt1
@@ -50,10 +50,10 @@ bool build_edge_list(mapbox::geometry::linear_ring<T> const& path_geometry, edge
         pt1 = *itr_rev;
     }
     ++itr;
-    mapbox::geometry::point<T> pt3 = *itr;
+    mapbox::geometry::point<T2> pt3 = *itr;
     auto itr_last = itr_rev.base();
-    mapbox::geometry::point<T> front_pt;
+    mapbox::geometry::point<T2> front_pt;
-    mapbox::geometry::point<T> back_pt;
+    mapbox::geometry::point<T2> back_pt;
     while (true) {
         if (pt3 == pt2) {
             // Duplicate point advance itr, but do not
@@ -84,10 +84,15 @@ bool build_edge_list(mapbox::geometry::linear_ring<T> const& path_geometry, edge
                 edges.pop_back(); // remove previous edge (pt1)
             }
             if (!edges.empty()) {
-                if (back_pt == edges.back().top) {
+                auto const& back_top = edges.back().top;
-                    pt1 = edges.back().bot;
+                if (static_cast<T1>(back_pt.x) == back_top.x &&
+                    static_cast<T1>(back_pt.y) == back_top.y) {
+                    auto const& back_bot = edges.back().bot;
+                    pt1 = mapbox::geometry::point<T2>(static_cast<T2>(back_bot.x),
+                                                      static_cast<T2>(back_bot.y));
                 } else {
-                    pt1 = edges.back().top;
+                    pt1 = mapbox::geometry::point<T2>(static_cast<T2>(back_top.x),
+                                                      static_cast<T2>(back_top.y));
                 }
                 back_pt = pt1;
             } else {

mapbox/geometry/wagyu/build_local_minima_list.hpp

@@ -9,26 +9,13 @@ namespace mapbox {
 namespace geometry {
 namespace wagyu {
 
-template <typename T>
+template <typename T1, typename T2>
-bool add_line_string(mapbox::geometry::line_string<T> const& path_geometry,
+bool add_linear_ring(mapbox::geometry::linear_ring<T2> const& path_geometry,
-                     local_minimum_list<T>& minima_list) {
+                     local_minimum_list<T1>& minima_list,
-    bool is_flat = true;
-    edge_list<T> new_edges;
-    new_edges.reserve(path_geometry.size());
-    if (!build_edge_list(path_geometry, new_edges, is_flat) || new_edges.empty()) {
-        return false;
-    }
-    add_line_to_local_minima_list(new_edges, minima_list, polygon_type_subject);
-    return true;
-}
-
-template <typename T>
-bool add_linear_ring(mapbox::geometry::linear_ring<T> const& path_geometry,
-                     local_minimum_list<T>& minima_list,
                      polygon_type p_type) {
-    edge_list<T> new_edges;
+    edge_list<T1> new_edges;
     new_edges.reserve(path_geometry.size());
-    if (!build_edge_list(path_geometry, new_edges) || new_edges.empty()) {
+    if (!build_edge_list<T1, T2>(path_geometry, new_edges) || new_edges.empty()) {
         return false;
     }
     add_ring_to_local_minima_list(new_edges, minima_list, p_type);

mapbox/geometry/wagyu/build_result.hpp

@@ -3,24 +3,28 @@
 #include <mapbox/geometry/wagyu/ring.hpp>
 #include <mapbox/geometry/wagyu/ring_util.hpp>
 
+#include <mapbox/geometry/multi_polygon.hpp>
+
 namespace mapbox {
 namespace geometry {
 namespace wagyu {
 
-template <typename T>
+template <typename T1, typename T2>
-void push_ring_to_polygon(mapbox::geometry::polygon<T>& poly, ring_ptr<T>& r, bool reverse_output) {
+void push_ring_to_polygon(mapbox::geometry::polygon<T2>& poly,
-    mapbox::geometry::linear_ring<T> lr;
+                          ring_ptr<T1> r,
-    lr.reserve(r->size + 1);
+                          bool reverse_output) {
+    mapbox::geometry::linear_ring<T2> lr;
+    lr.reserve(r->size() + 1);
     auto firstPt = r->points;
     auto ptIt = r->points;
     if (reverse_output) {
         do {
-            lr.emplace_back(ptIt->x, ptIt->y);
+            lr.emplace_back(static_cast<T2>(ptIt->x), static_cast<T2>(ptIt->y));
             ptIt = ptIt->next;
         } while (ptIt != firstPt);
     } else {
         do {
-            lr.emplace_back(ptIt->x, ptIt->y);
+            lr.emplace_back(static_cast<T2>(ptIt->x), static_cast<T2>(ptIt->y));
             ptIt = ptIt->prev;
         } while (ptIt != firstPt);
     }
@@ -28,28 +32,28 @@ void push_ring_to_polygon(mapbox::geometry::polygon<T>& poly, ring_ptr<T>& r, bo
     poly.push_back(lr);
 }
 
-template <typename T>
+template <typename T1, typename T2>
-void build_result_polygons(std::vector<mapbox::geometry::polygon<T>>& solution,
+void build_result_polygons(mapbox::geometry::multi_polygon<T2>& solution,
-                           ring_list<T>& rings,
+                           ring_vector<T1>const& rings,
                            bool reverse_output) {
-
+    for (auto r : rings) {
-    for (auto& r : rings) {
+        if (r == nullptr) {
-        assert(r->points);
-        std::size_t cnt = point_count(r->points);
-        if (cnt < 3) {
             continue;
         }
+        assert(r->points);
         solution.emplace_back();
         push_ring_to_polygon(solution.back(), r, reverse_output);
-        for (auto& c : r->children) {
+        for (auto c : r->children) {
-            assert(c->points);
+            if (c == nullptr) {
-            cnt = point_count(c->points);
-            if (cnt < 3) {
                 continue;
             }
+            assert(c->points);
             push_ring_to_polygon(solution.back(), c, reverse_output);
         }
-        for (auto& c : r->children) {
+        for (auto c : r->children) {
+            if (c == nullptr) {
+                continue;
+            }
             if (!c->children.empty()) {
                 build_result_polygons(solution, c->children, reverse_output);
             }
@@ -57,9 +61,9 @@ void build_result_polygons(std::vector<mapbox::geometry::polygon<T>>& solution,
     }
 }
 
-template <typename T>
+template <typename T1, typename T2>
-void build_result(std::vector<mapbox::geometry::polygon<T>>& solution,
+void build_result(mapbox::geometry::multi_polygon<T2>& solution,
-                  ring_manager<T>& rings,
+                  ring_manager<T1>const& rings,
                   bool reverse_output) {
     build_result_polygons(solution, rings.children, reverse_output);
 }

mapbox/geometry/wagyu/edge.hpp

@@ -38,13 +38,16 @@ struct edge {
         return *this;
     }
 
-    edge(mapbox::geometry::point<T> const& current,
+    template <typename T2>
-         mapbox::geometry::point<T> const& next_pt) noexcept
+    edge(mapbox::geometry::point<T2> const& current,
-        : bot(current), top(current), dx(0.0) {
+         mapbox::geometry::point<T2> const& next_pt) noexcept
+        : bot(static_cast<T>(current.x), static_cast<T>(current.y)),
+          top(static_cast<T>(current.x), static_cast<T>(current.y)),
+          dx(0.0) {
         if (current.y >= next_pt.y) {
-            top = next_pt;
+            top = mapbox::geometry::point<T>(static_cast<T>(next_pt.x), static_cast<T>(next_pt.y));
         } else {
-            bot = next_pt;
+            bot = mapbox::geometry::point<T>(static_cast<T>(next_pt.x), static_cast<T>(next_pt.y));
         }
         double dy = static_cast<double>(top.y - bot.y);
         if (value_is_zero(dy)) {

mapbox/geometry/wagyu/intersect.hpp

@@ -17,8 +17,8 @@ namespace wagyu {
 template <typename T>
 struct intersect_node {
 
-    active_bound_list_itr<T> bound1;
+    bound_ptr<T> bound1;
-    active_bound_list_itr<T> bound2;
+    bound_ptr<T> bound2;
     mapbox::geometry::point<double> pt;
 
     intersect_node(intersect_node<T>&& n)
@@ -32,8 +32,8 @@ struct intersect_node {
         return *this;
     }
 
-    intersect_node(active_bound_list_itr<T> const& bound1_,
+    intersect_node(bound_ptr<T> const& bound1_,
-                   active_bound_list_itr<T> const& bound2_,
+                   bound_ptr<T> const& bound2_,
                    mapbox::geometry::point<double> const& pt_)
         : bound1(bound1_), bound2(bound2_), pt(pt_) {
     }
@@ -49,9 +49,9 @@ inline std::basic_ostream<charT, traits>& operator<<(std::basic_ostream<charT, t
                                                      const intersect_node<T>& e) {
     out << " point x: " << e.pt.x << " y: " << e.pt.y << std::endl;
     out << " bound 1: " << std::endl;
-    out << *(*e.bound1) << std::endl;
+    out << *e.bound1 << std::endl;
     out << " bound 2: " << std::endl;
-    out << *(*e.bound2) << std::endl;
+    out << *e.bound2 << std::endl;
     return out;
 }
 

mapbox/geometry/wagyu/intersect_util.hpp

@@ -2,11 +2,14 @@
 
 #include <mapbox/geometry/wagyu/active_bound_list.hpp>
 #include <mapbox/geometry/wagyu/bound.hpp>
+#include <mapbox/geometry/wagyu/bubble_sort.hpp>
 #include <mapbox/geometry/wagyu/config.hpp>
 #include <mapbox/geometry/wagyu/intersect.hpp>
 #include <mapbox/geometry/wagyu/ring_util.hpp>
 #include <mapbox/geometry/wagyu/util.hpp>
 
+#include <algorithm>
+
 namespace mapbox {
 namespace geometry {
 namespace wagyu {
@@ -17,8 +20,8 @@ struct intersect_list_sorter {
         if (!values_are_equal(node2.pt.y, node1.pt.y)) {
             return node2.pt.y < node1.pt.y;
         } else {
-            return ((*node2.bound1)->winding_count2 + (*node2.bound2)->winding_count2) >
+            return (node2.bound1->winding_count2 + node2.bound2->winding_count2) >
-                   ((*node1.bound1)->winding_count2 + (*node1.bound2)->winding_count2);
+                   (node1.bound1->winding_count2 + node1.bound2->winding_count2);
         }
     }
 };
@@ -60,9 +63,8 @@ bool get_edge_intersection(edge<T1> const& e1,
     s2_x = p3_x - p2_x;
     s2_y = p3_y - p2_y;
 
-    T2 s, t;
+    T2 s = (-s1_y * (p0_x - p2_x) + s1_x * (p0_y - p2_y)) / (-s2_x * s1_y + s1_x * s2_y);
-    s = (-s1_y * (p0_x - p2_x) + s1_x * (p0_y - p2_y)) / (-s2_x * s1_y + s1_x * s2_y);
+    T2 t = (s2_x * (p0_y - p2_y) - s2_y * (p0_x - p2_x)) / (-s2_x * s1_y + s1_x * s2_y);
-    t = (s2_x * (p0_y - p2_y) - s2_y * (p0_x - p2_x)) / (-s2_x * s1_y + s1_x * s2_y);
 
     if (s >= 0.0 && s <= 1.0 && t >= 0.0 && t <= 1.0) {
         pt.x = p0_x + (t * s1_x);
@@ -75,89 +77,89 @@ bool get_edge_intersection(edge<T1> const& e1,
 }
 
 template <typename T>
-void build_intersect_list(active_bound_list<T>& active_bounds, intersect_list<T>& intersects) {
+struct intersection_compare {
-    // bubblesort ...
+    bool operator()(bound_ptr<T> const& b1, bound_ptr<T> const& b2) {
-    bool isModified = false;
+        return !(b1->current_x > b2->current_x &&
-    do {
+                 !slopes_equal(*(b1->current_edge), *(b2->current_edge)));
-        isModified = false;
+    }
-        auto bnd = active_bounds.begin();
+};
-        auto bnd_next = std::next(bnd);
+
-        while (bnd_next != active_bounds.end()) {
+template <typename T>
-            if ((*bnd)->current_x > (*bnd_next)->current_x &&
+struct on_intersection_swap {
-                !slopes_equal(*((*bnd)->current_edge), *((*bnd_next)->current_edge))) {
+
+    intersect_list<T>& intersects;
+
+    on_intersection_swap(intersect_list<T>& i) : intersects(i) {
+    }
+
+    void operator()(bound_ptr<T> const& b1, bound_ptr<T> const& b2) {
         mapbox::geometry::point<double> pt;
-                if (!get_edge_intersection<T, double>(*((*bnd)->current_edge),
+        if (!get_edge_intersection<T, double>(*(b1->current_edge), *(b2->current_edge), pt)) {
-                                                      *((*bnd_next)->current_edge), pt)) {
             // LCOV_EXCL_START
-                    throw std::runtime_error(
+            throw std::runtime_error("Trying to find intersection of lines that do not intersect");
-                        "Trying to find intersection of lines that do not intersect");
             // LCOV_EXCL_END
         }
-                intersects.emplace_back(bnd, bnd_next, pt);
+        intersects.emplace_back(b1, b2, pt);
-                swap_positions_in_ABL(bnd, bnd_next, active_bounds);
-                bnd_next = std::next(bnd);
-                isModified = true;
-            } else {
-                bnd = bnd_next;
-                ++bnd_next;
     }
-        }
+};
-    } while (isModified);
+
+template <typename T>
+void build_intersect_list(active_bound_list<T>& active_bounds, intersect_list<T>& intersects) {
+    bubble_sort(active_bounds.begin(), active_bounds.end(), intersection_compare<T>(),
+                on_intersection_swap<T>(intersects));
 }
 
 template <typename T>
-void intersect_bounds(active_bound_list_itr<T>& b1,
+void intersect_bounds(bound<T>& b1,
-                      active_bound_list_itr<T>& b2,
+                      bound<T>& b2,
                       mapbox::geometry::point<T> const& pt,
                       clip_type cliptype,
                       fill_type subject_fill_type,
                       fill_type clip_fill_type,
                       ring_manager<T>& rings,
                       active_bound_list<T>& active_bounds) {
-    bool b1Contributing = ((*b1)->ring != nullptr);
+    bool b1Contributing = (b1.ring != nullptr);
-    bool b2Contributing = ((*b2)->ring != nullptr);
+    bool b2Contributing = (b2.ring != nullptr);
 
     // update winding counts...
     // assumes that b1 will be to the Right of b2 ABOVE the intersection
-    if ((*b1)->poly_type == (*b2)->poly_type) {
+    if (b1.poly_type == b2.poly_type) {
-        if (is_even_odd_fill_type(*(*b1), subject_fill_type, clip_fill_type)) {
+        if (is_even_odd_fill_type(b1, subject_fill_type, clip_fill_type)) {
-            std::int32_t oldE1winding_count = (*b1)->winding_count;
+            std::swap(b1.winding_count, b2.winding_count);
-            (*b1)->winding_count = (*b2)->winding_count;
-            (*b2)->winding_count = oldE1winding_count;
         } else {
-            if ((*b1)->winding_count + (*b2)->winding_delta == 0) {
+            if (b1.winding_count + b2.winding_delta == 0) {
-                (*b1)->winding_count = -(*b1)->winding_count;
+                b1.winding_count = -b1.winding_count;
             } else {
-                (*b1)->winding_count += (*b2)->winding_delta;
+                b1.winding_count += b2.winding_delta;
             }
-            if ((*b2)->winding_count - (*b1)->winding_delta == 0) {
+            if (b2.winding_count - b1.winding_delta == 0) {
-                (*b2)->winding_count = -(*b2)->winding_count;
+                b2.winding_count = -b2.winding_count;
             } else {
-                (*b2)->winding_count -= (*b1)->winding_delta;
+                b2.winding_count -= b1.winding_delta;
             }
         }
     } else {
-        if (!is_even_odd_fill_type(*(*b2), subject_fill_type, clip_fill_type)) {
+        if (!is_even_odd_fill_type(b2, subject_fill_type, clip_fill_type)) {
-            (*b1)->winding_count2 += (*b2)->winding_delta;
+            b1.winding_count2 += b2.winding_delta;
         } else {
-            (*b1)->winding_count2 = ((*b1)->winding_count2 == 0) ? 1 : 0;
+            b1.winding_count2 = (b1.winding_count2 == 0) ? 1 : 0;
         }
-        if (!is_even_odd_fill_type(*(*b1), subject_fill_type, clip_fill_type)) {
+        if (!is_even_odd_fill_type(b1, subject_fill_type, clip_fill_type)) {
-            (*b2)->winding_count2 -= (*b1)->winding_delta;
+            b2.winding_count2 -= b1.winding_delta;
         } else {
-            (*b2)->winding_count2 = ((*b2)->winding_count2 == 0) ? 1 : 0;
+            b2.winding_count2 = (b2.winding_count2 == 0) ? 1 : 0;
         }
     }
 
     fill_type b1FillType, b2FillType, b1FillType2, b2FillType2;
-    if ((*b1)->poly_type == polygon_type_subject) {
+    if (b1.poly_type == polygon_type_subject) {
         b1FillType = subject_fill_type;
         b1FillType2 = clip_fill_type;
     } else {
         b1FillType = clip_fill_type;
         b1FillType2 = subject_fill_type;
     }
-    if ((*b2)->poly_type == polygon_type_subject) {
+    if (b2.poly_type == polygon_type_subject) {
         b2FillType = subject_fill_type;
         b2FillType2 = clip_fill_type;
     } else {
@@ -168,51 +170,51 @@ void intersect_bounds(active_bound_list_itr<T>& b1,
     std::int32_t b1Wc, b2Wc;
     switch (b1FillType) {
     case fill_type_positive:
-        b1Wc = (*b1)->winding_count;
+        b1Wc = b1.winding_count;
         break;
     case fill_type_negative:
-        b1Wc = -(*b1)->winding_count;
+        b1Wc = -b1.winding_count;
         break;
     case fill_type_even_odd:
     case fill_type_non_zero:
     default:
-        b1Wc = std::abs(static_cast<int>((*b1)->winding_count));
+        b1Wc = std::abs(static_cast<int>(b1.winding_count));
     }
     switch (b2FillType) {
     case fill_type_positive:
-        b2Wc = (*b2)->winding_count;
+        b2Wc = b2.winding_count;
         break;
     case fill_type_negative:
-        b2Wc = -(*b2)->winding_count;
+        b2Wc = -b2.winding_count;
         break;
     case fill_type_even_odd:
     case fill_type_non_zero:
     default:
-        b2Wc = std::abs(static_cast<int>((*b2)->winding_count));
+        b2Wc = std::abs(static_cast<int>(b2.winding_count));
     }
     if (b1Contributing && b2Contributing) {
         if ((b1Wc != 0 && b1Wc != 1) || (b2Wc != 0 && b2Wc != 1) ||
-            ((*b1)->poly_type != (*b2)->poly_type && cliptype != clip_type_x_or)) {
+            (b1.poly_type != b2.poly_type && cliptype != clip_type_x_or)) {
             add_local_maximum_point(b1, b2, pt, rings, active_bounds);
         } else {
             add_point(b1, active_bounds, pt, rings);
             add_point(b2, active_bounds, pt, rings);
-            swap_sides(*(*b1), *(*b2));
+            swap_sides(b1, b2);
-            swap_rings(*(*b1), *(*b2));
+            swap_rings(b1, b2);
         }
     } else if (b1Contributing) {
         if (b2Wc == 0 || b2Wc == 1) {
             add_point(b1, active_bounds, pt, rings);
-            (*b2)->last_point = pt;
+            b2.last_point = pt;
-            swap_sides(*(*b1), *(*b2));
+            swap_sides(b1, b2);
-            swap_rings(*(*b1), *(*b2));
+            swap_rings(b1, b2);
         }
     } else if (b2Contributing) {
         if (b1Wc == 0 || b1Wc == 1) {
-            (*b1)->last_point = pt;
+            b1.last_point = pt;
             add_point(b2, active_bounds, pt, rings);
-            swap_sides(*(*b1), *(*b2));
+            swap_sides(b1, b2);
-            swap_rings(*(*b1), *(*b2));
+            swap_rings(b1, b2);
         }
     } else if ((b1Wc == 0 || b1Wc == 1) && (b2Wc == 0 || b2Wc == 1)) {
         // neither bound is currently contributing ...
@@ -220,30 +222,30 @@ void intersect_bounds(active_bound_list_itr<T>& b1,
         std::int32_t b1Wc2, b2Wc2;
         switch (b1FillType2) {
         case fill_type_positive:
-            b1Wc2 = (*b1)->winding_count2;
+            b1Wc2 = b1.winding_count2;
             break;
         case fill_type_negative:
-            b1Wc2 = -(*b1)->winding_count2;
+            b1Wc2 = -b1.winding_count2;
             break;
         case fill_type_even_odd:
         case fill_type_non_zero:
         default:
-            b1Wc2 = std::abs(static_cast<int>((*b1)->winding_count2));
+            b1Wc2 = std::abs(static_cast<int>(b1.winding_count2));
         }
         switch (b2FillType2) {
         case fill_type_positive:
-            b2Wc2 = (*b2)->winding_count2;
+            b2Wc2 = b2.winding_count2;
             break;
         case fill_type_negative:
-            b2Wc2 = -(*b2)->winding_count2;
+            b2Wc2 = -b2.winding_count2;
             break;
         case fill_type_even_odd:
         case fill_type_non_zero:
         default:
-            b2Wc2 = std::abs(static_cast<int>((*b2)->winding_count2));
+            b2Wc2 = std::abs(static_cast<int>(b2.winding_count2));
         }
 
-        if ((*b1)->poly_type != (*b2)->poly_type) {
+        if (b1.poly_type != b2.poly_type) {
             add_local_minimum_point(b1, b2, active_bounds, pt, rings);
         } else if (b1Wc == 1 && b2Wc == 1) {
             switch (cliptype) {
@@ -259,8 +261,8 @@ void intersect_bounds(active_bound_list_itr<T>& b1,
                 }
                 break;
             case clip_type_difference:
-                if ((((*b1)->poly_type == polygon_type_clip) && (b1Wc2 > 0) && (b2Wc2 > 0)) ||
+                if (((b1.poly_type == polygon_type_clip) && (b1Wc2 > 0) && (b2Wc2 > 0)) ||
-                    (((*b1)->poly_type == polygon_type_subject) && (b1Wc2 <= 0) && (b2Wc2 <= 0))) {
+                    ((b1.poly_type == polygon_type_subject) && (b1Wc2 <= 0) && (b2Wc2 <= 0))) {
                     add_local_minimum_point(b1, b2, active_bounds, pt, rings);
                 }
                 break;
@@ -268,16 +270,29 @@ void intersect_bounds(active_bound_list_itr<T>& b1,
                 add_local_minimum_point(b1, b2, active_bounds, pt, rings);
             }
         } else {
-            swap_sides(*(*b1), *(*b2));
+            swap_sides(b1, b2);
         }
     }
 }
 
 template <typename T>
-bool bounds_adjacent(intersect_node<T> const& inode) {
+bool bounds_adjacent(intersect_node<T> const& inode, bound_ptr<T> next) {
-    return (std::next(inode.bound1) == inode.bound2) || (std::next(inode.bound2) == inode.bound1);
+    return (next == inode.bound2) || (next == inode.bound1);
 }
 
+template <typename T>
+struct find_first_bound {
+    bound_ptr<T> b1;
+    bound_ptr<T> b2;
+
+    find_first_bound(intersect_node<T> const& inode) : b1(inode.bound1), b2(inode.bound2) {
+    }
+
+    bool operator()(bound_ptr<T> const& b) {
+        return b == b1 || b == b2;
+    }
+};
+
 template <typename T>
 void process_intersect_list(intersect_list<T>& intersects,
                             clip_type cliptype,
@@ -286,9 +301,20 @@ void process_intersect_list(intersect_list<T>& intersects,
                             ring_manager<T>& rings,
                             active_bound_list<T>& active_bounds) {
     for (auto node_itr = intersects.begin(); node_itr != intersects.end(); ++node_itr) {
-        if (!bounds_adjacent(*node_itr)) {
+        auto b1 = std::find_if(active_bounds.begin(), active_bounds.end(),
+                               find_first_bound<T>(*node_itr));
+        auto b2 = std::next(b1);
+        if (!bounds_adjacent(*node_itr, *b2)) {
             auto next_itr = std::next(node_itr);
-            while (next_itr != intersects.end() && !bounds_adjacent(*next_itr)) {
+            while (next_itr != intersects.end()) {
+                auto n1 = std::find_if(active_bounds.begin(), active_bounds.end(),
+                                       find_first_bound<T>(*next_itr));
+                auto n2 = std::next(n1);
+                if (bounds_adjacent(*next_itr, *n2)) {
+                    b1 = n1;
+                    b2 = n2;
+                    break;
+                }
                 ++next_itr;
             }
             if (next_itr == intersects.end()) {
@@ -297,9 +323,9 @@ void process_intersect_list(intersect_list<T>& intersects,
             std::iter_swap(node_itr, next_itr);
         }
         mapbox::geometry::point<T> pt = round_point<T>(node_itr->pt);
-        intersect_bounds(node_itr->bound1, node_itr->bound2, pt, cliptype, subject_fill_type,
+        intersect_bounds(*(node_itr->bound1), *(node_itr->bound2), pt, cliptype, subject_fill_type,
                          clip_fill_type, rings, active_bounds);
-        swap_positions_in_ABL(node_itr->bound1, node_itr->bound2, active_bounds);
+        std::iter_swap(b1, b2);
     }
 }
 
@@ -331,7 +357,8 @@ void process_intersections(T top_y,
     }
 
     // Restore order of active bounds list
-    active_bounds.sort(
+    std::stable_sort(
+        active_bounds.begin(), active_bounds.end(),
         [](bound_ptr<T> const& b1, bound_ptr<T> const& b2) { return b1->pos < b2->pos; });
 
     // Sort the intersection list

mapbox/geometry/wagyu/local_minimum_util.hpp

@@ -3,6 +3,8 @@
 #include <mapbox/geometry/wagyu/edge.hpp>
 #include <mapbox/geometry/wagyu/local_minimum.hpp>
 
+#include <algorithm>
+
 #ifdef DEBUG
 #include <stdexcept>
 #endif
@@ -102,7 +104,7 @@ bound<T> create_bound_towards_minimum(edge_list<T>& edges) {
     if (next_edge == edges.end()) {
         std::swap(edges, bnd.edges);
     } else {
-        bnd.edges.reserve(std::distance(edges.begin(), next_edge));
+        bnd.edges.reserve(static_cast<std::size_t>(std::distance(edges.begin(), next_edge)));
         std::move(edges.begin(), next_edge, std::back_inserter(bnd.edges));
         edges.erase(edges.begin(), next_edge);
     }
@@ -147,7 +149,7 @@ bound<T> create_bound_towards_maximum(edge_list<T>& edges) {
     if (next_edge == edges.end()) {
         std::swap(bnd.edges, edges);
     } else {
-        bnd.edges.reserve(std::distance(edges.begin(), next_edge));
+        bnd.edges.reserve(static_cast<std::size_t>(std::distance(edges.begin(), next_edge)));
         std::move(edges.begin(), next_edge, std::back_inserter(bnd.edges));
         edges.erase(edges.begin(), next_edge);
     }
@@ -234,12 +236,12 @@ void add_ring_to_local_minima_list(edge_list<T>& edges,
             lm_minimum_has_horizontal = true;
             ++to_min_first_non_horizontal;
         }
-#ifdef DEBUG
+
         if (to_max_first_non_horizontal == to_maximum.edges.end() ||
             to_min_first_non_horizontal == to_minimum.edges.end()) {
             throw std::runtime_error("should not have a horizontal only bound for a ring");
         }
-#endif
+
         if (lm_minimum_has_horizontal) {
             if (to_max_first_non_horizontal->bot.x > to_min_first_non_horizontal->bot.x) {
                 minimum_is_left = true;

mapbox/geometry/wagyu/point.hpp

@@ -37,18 +37,12 @@ struct point {
     point_ptr<T> next;
     point_ptr<T> prev;
 
-    point(point<T>&& p)
-        : ring(std::move(p.ring)),
-          x(std::move(p.x)),
-          y(std::move(p.y)),
-          next(std::move(p.next)),
-          prev(std::move(p.prev)) {
-    }
-
     point() : ring(nullptr), x(0), y(0), prev(this), next(this) {
     }
+
     point(T x_, T y_) : ring(nullptr), x(x_), y(y_), next(this), prev(this) {
     }
+
     point(ring_ptr<T> ring_, mapbox::geometry::point<T> const& pt)
         : ring(ring_), x(pt.x), y(pt.y), next(this), prev(this) {
     }
@@ -60,6 +54,12 @@ struct point {
     }
 };
 
+template <typename T>
+using point_vector = std::vector<point_ptr<T>>;
+
+template <typename T>
+using point_vector_itr = typename point_vector<T>::iterator;
+
 template <typename T>
 bool operator==(point<T> const& lhs, point<T> const& rhs) {
     return lhs.x == rhs.x && lhs.y == rhs.y;

mapbox/geometry/wagyu/process_horizontal.hpp

@@ -23,6 +23,7 @@ active_bound_list_itr<T> process_horizontal_left_to_right(T scanline_y,
                                                           fill_type subject_fill_type,
                                                           fill_type clip_fill_type) {
     auto horizontal_itr_behind = horz_bound;
+    bool shifted = false;
     bool is_maxima_edge = is_maxima(horz_bound, scanline_y);
     auto bound_max_pair = active_bounds.end();
     if (is_maxima_edge) {
@@ -39,11 +40,15 @@ active_bound_list_itr<T> process_horizontal_left_to_right(T scanline_y,
     auto bnd = std::next(horz_bound);
 
     while (bnd != active_bounds.end()) {
+        if (*bnd == nullptr) {
+            ++bnd;
+            continue;
+        }
         // this code block inserts extra coords into horizontal edges (in output
         // polygons) wherever hot pixels touch these horizontal edges. This helps
         //'simplifying' polygons (ie if the Simplify property is set).
         while (hp_itr != rings.hot_pixels.end() && hp_itr->y == scanline_y &&
-               hp_itr->x < std::llround((*bnd)->current_x) &&
+               hp_itr->x < wround<T>((*bnd)->current_x) &&
                hp_itr->x < (*horz_bound)->current_edge->top.x) {
             if ((*horz_bound)->ring) {
                 add_point_to_ring(*(*horz_bound), *hp_itr, rings);
@@ -57,7 +62,7 @@ active_bound_list_itr<T> process_horizontal_left_to_right(T scanline_y,
 
         // Also break if we've got to the end of an intermediate horizontal edge ...
         // nb: Smaller Dx's are to the right of larger Dx's ABOVE the horizontal.
-        if (std::llround((*bnd)->current_x) == (*horz_bound)->current_edge->top.x &&
+        if (wround<T>((*bnd)->current_x) == (*horz_bound)->current_edge->top.x &&
             (*horz_bound)->next_edge != (*horz_bound)->edges.end() &&
             (*horz_bound)->current_edge->dx < (*horz_bound)->next_edge->dx) {
             break;
@@ -65,99 +70,95 @@ active_bound_list_itr<T> process_horizontal_left_to_right(T scanline_y,
 
         // note: may be done multiple times
         if ((*horz_bound)->ring) {
-            add_point_to_ring(
+            add_point_to_ring(*(*horz_bound),
-                *(*horz_bound),
+                              mapbox::geometry::point<T>(wround<T>((*bnd)->current_x), scanline_y),
-                mapbox::geometry::point<T>(std::llround((*bnd)->current_x), scanline_y), rings);
+                              rings);
         }
 
         // OK, so far we're still in range of the horizontal Edge  but make sure
         // we're at the last of consec. horizontals when matching with eMaxPair
         if (is_maxima_edge && bnd == bound_max_pair) {
             if ((*horz_bound)->ring) {
-                add_local_maximum_point(horz_bound, bound_max_pair,
+                add_local_maximum_point(*(*horz_bound), *(*bound_max_pair),
                                         (*horz_bound)->current_edge->top, rings, active_bounds);
             }
-            active_bounds.erase(bound_max_pair);
+            *bound_max_pair = nullptr;
-            auto after_horz = active_bounds.erase(horz_bound);
+            *horz_bound = nullptr;
-            if (horizontal_itr_behind != horz_bound) {
+            if (!shifted) {
-                return horizontal_itr_behind;
+                ++horizontal_itr_behind;
-            } else {
-                return after_horz;
             }
+            return horizontal_itr_behind;
         }
 
-        intersect_bounds(horz_bound, bnd,
+        intersect_bounds(*(*horz_bound), *(*bnd),
-                         mapbox::geometry::point<T>(std::llround((*bnd)->current_x), scanline_y),
+                         mapbox::geometry::point<T>(wround<T>((*bnd)->current_x), scanline_y),
                          cliptype, subject_fill_type, clip_fill_type, rings, active_bounds);
-        auto next_bnd = std::next(bnd);
+        std::iter_swap(horz_bound, bnd);
-        swap_positions_in_ABL(horz_bound, bnd, active_bounds);
+        horz_bound = bnd;
-        if (current_edge_is_horizontal<T>(bnd) && horizontal_itr_behind == horz_bound) {
+        ++bnd;
-            horizontal_itr_behind = bnd;
+        shifted = true;
-        }
-        bnd = next_bnd;
     } // end while (bnd != active_bounds.end())
 
     if ((*horz_bound)->ring) {
         while (hp_itr != rings.hot_pixels.end() && hp_itr->y == scanline_y &&
-               hp_itr->x < std::llround((*horz_bound)->current_edge->top.x)) {
+               hp_itr->x < (*horz_bound)->current_edge->top.x) {
             add_point_to_ring(*(*horz_bound), *hp_itr, rings);
             ++hp_itr;
         }
     }
 
+    if ((*horz_bound)->ring) {
+        add_point_to_ring(*(*horz_bound), (*horz_bound)->current_edge->top, rings);
+    }
+
     if ((*horz_bound)->next_edge != (*horz_bound)->edges.end()) {
-        if ((*horz_bound)->ring) {
+        next_edge_in_bound(*(*horz_bound), scanbeam);
-            add_point_to_ring(*(*horz_bound), (*horz_bound)->current_edge->top, rings);
-            next_edge_in_bound(horz_bound, scanbeam);
     } else {
-            next_edge_in_bound(horz_bound, scanbeam);
+        *horz_bound = nullptr;
+    }
+    if (!shifted) {
+        ++horizontal_itr_behind;
     }
-        if (horizontal_itr_behind != horz_bound) {
     return horizontal_itr_behind;
-        } else {
-            return std::next(horz_bound);
-        }
-    } else {
-        if ((*horz_bound)->ring) {
-            add_point_to_ring(*(*horz_bound), (*horz_bound)->current_edge->top, rings);
-        }
-        auto after_horz = active_bounds.erase(horz_bound);
-        if (horizontal_itr_behind != horz_bound) {
-            return horizontal_itr_behind;
-        } else {
-            return after_horz;
-        }
-    }
 }
 
 template <typename T>
 active_bound_list_itr<T> process_horizontal_right_to_left(T scanline_y,
-                                                          active_bound_list_itr<T>& horz_bound,
+                                                          active_bound_list_itr<T>& horz_bound_fwd,
                                                           active_bound_list<T>& active_bounds,
                                                           ring_manager<T>& rings,
                                                           scanbeam_list<T>& scanbeam,
                                                           clip_type cliptype,
                                                           fill_type subject_fill_type,
                                                           fill_type clip_fill_type) {
-    bool is_maxima_edge = is_maxima(horz_bound, scanline_y);
+    auto next_bnd_itr = std::next(horz_bound_fwd);
-    auto bound_max_pair = active_bounds.end();
+    bool is_maxima_edge = is_maxima(horz_bound_fwd, scanline_y);
+    auto bound_max_pair = active_bounds.rend();
     if (is_maxima_edge) {
-        bound_max_pair = get_maxima_pair<T>(horz_bound, active_bounds);
+        bound_max_pair =
+            active_bound_list_rev_itr<T>(get_maxima_pair<T>(horz_bound_fwd, active_bounds));
+        --bound_max_pair;
     }
     auto hp_itr_fwd = rings.current_hp_itr;
-    while (hp_itr_fwd != rings.hot_pixels.end() &&
+    while (
+        hp_itr_fwd != rings.hot_pixels.end() &&
         (hp_itr_fwd->y < scanline_y ||
-            (hp_itr_fwd->y == scanline_y && hp_itr_fwd->x < (*horz_bound)->current_edge->top.x))) {
+         (hp_itr_fwd->y == scanline_y && hp_itr_fwd->x < (*horz_bound_fwd)->current_edge->top.x))) {
         ++hp_itr_fwd;
     }
     auto hp_itr = hot_pixel_rev_itr<T>(hp_itr_fwd);
 
-    auto bnd = active_bound_list_rev_itr<T>(horz_bound);
+    auto bnd = active_bound_list_rev_itr<T>(horz_bound_fwd);
+    auto horz_bound = std::prev(bnd);
     while (bnd != active_bounds.rend()) {
+        if (*bnd == nullptr) {
+            ++bnd;
+            continue;
+        }
         // this code block inserts extra coords into horizontal edges (in output
         // polygons) wherever hot pixels touch these horizontal edges.
         while (hp_itr != rings.hot_pixels.rend() && hp_itr->y == scanline_y &&
-               hp_itr->x > std::llround((*bnd)->current_x) &&
+               hp_itr->x > wround<T>((*bnd)->current_x) &&
                hp_itr->x > (*horz_bound)->current_edge->top.x) {
             if ((*horz_bound)->ring) {
                 add_point_to_ring(*(*horz_bound), *hp_itr, rings);
@@ -171,7 +172,7 @@ active_bound_list_itr<T> process_horizontal_right_to_left(T scanline_y,
 
         // Also break if we've got to the end of an intermediate horizontal edge ...
         // nb: Smaller Dx's are to the right of larger Dx's ABOVE the horizontal.
-        if (std::llround((*bnd)->current_x) == (*horz_bound)->current_edge->top.x &&
+        if (wround<T>((*bnd)->current_x) == (*horz_bound)->current_edge->top.x &&
             (*horz_bound)->next_edge != (*horz_bound)->edges.end() &&
             (*horz_bound)->current_edge->dx < (*horz_bound)->next_edge->dx) {
             break;
@@ -179,32 +180,29 @@ active_bound_list_itr<T> process_horizontal_right_to_left(T scanline_y,
 
         // note: may be done multiple times
         if ((*horz_bound)->ring) {
-            add_point_to_ring(
+            add_point_to_ring(*(*horz_bound),
-                *(*horz_bound),
+                              mapbox::geometry::point<T>(wround<T>((*bnd)->current_x), scanline_y),
-                mapbox::geometry::point<T>(std::llround((*bnd)->current_x), scanline_y), rings);
+                              rings);
         }
-        auto bnd_forward = --(bnd.base());
 
         // OK, so far we're still in range of the horizontal Edge  but make sure
         // we're at the last of consec. horizontals when matching with eMaxPair
-        if (is_maxima_edge && bnd_forward == bound_max_pair) {
+        if (is_maxima_edge && bnd == bound_max_pair) {
             if ((*horz_bound)->ring) {
-                add_local_maximum_point(horz_bound, bound_max_pair,
+                add_local_maximum_point(*(*horz_bound), *(*bound_max_pair),
                                         (*horz_bound)->current_edge->top, rings, active_bounds);
             }
-            active_bounds.erase(bound_max_pair);
+            *bound_max_pair = nullptr;
-            return active_bounds.erase(horz_bound);
+            *horz_bound = nullptr;
+            return next_bnd_itr;
         }
 
-        intersect_bounds(bnd_forward, horz_bound,
+        intersect_bounds(*(*bnd), *(*horz_bound),
-                         mapbox::geometry::point<T>(std::llround((*bnd)->current_x), scanline_y),
+                         mapbox::geometry::point<T>(wround<T>((*bnd)->current_x), scanline_y),
                          cliptype, subject_fill_type, clip_fill_type, rings, active_bounds);
-        swap_positions_in_ABL(horz_bound, bnd_forward, active_bounds);
+        std::iter_swap(horz_bound, bnd);
-        // Why are we not incrementing the bnd iterator here:
+        horz_bound = bnd;
-        // It is because reverse iterators point to a `base()` iterator that is a forward
+        ++bnd;
-        // iterator that is one ahead of the reverse bound. This will always be the horizontal
-        // bound,
-        // so what the reverse bound points to will have changed.
     } // end while (bnd != active_bounds.rend())
 
     if ((*horz_bound)->ring) {
@@ -214,21 +212,16 @@ active_bound_list_itr<T> process_horizontal_right_to_left(T scanline_y,
             ++hp_itr;
         }
     }
+    if ((*horz_bound)->ring) {
+        add_point_to_ring(*(*horz_bound), (*horz_bound)->current_edge->top, rings);
+    }
 
     if ((*horz_bound)->next_edge != (*horz_bound)->edges.end()) {
-        if ((*horz_bound)->ring) {
+        next_edge_in_bound(*(*horz_bound), scanbeam);
-            add_point_to_ring(*(*horz_bound), (*horz_bound)->current_edge->top, rings);
-            next_edge_in_bound(horz_bound, scanbeam);
     } else {
-            next_edge_in_bound(horz_bound, scanbeam);
+        *horz_bound = nullptr;
-        }
-        return std::next(horz_bound);
-    } else {
-        if ((*horz_bound)->ring) {
-            add_point_to_ring(*(*horz_bound), (*horz_bound)->current_edge->top, rings);
-        }
-        return active_bounds.erase(horz_bound);
     }
+    return next_bnd_itr;
 }
 
 template <typename T>
@@ -260,13 +253,15 @@ void process_horizontals(T scanline_y,
                          fill_type subject_fill_type,
                          fill_type clip_fill_type) {
     for (auto bnd_itr = active_bounds.begin(); bnd_itr != active_bounds.end();) {
-        if (current_edge_is_horizontal<T>(bnd_itr)) {
+        if (*bnd_itr != nullptr && current_edge_is_horizontal<T>(bnd_itr)) {
             bnd_itr = process_horizontal(scanline_y, bnd_itr, active_bounds, rings, scanbeam,
                                          cliptype, subject_fill_type, clip_fill_type);
         } else {
             ++bnd_itr;
         }
     }
+    active_bounds.erase(std::remove(active_bounds.begin(), active_bounds.end(), nullptr),
+                        active_bounds.end());
 }
 }
 }

mapbox/geometry/wagyu/process_maxima.hpp

@@ -22,39 +22,36 @@ active_bound_list_itr<T> do_maxima(active_bound_list_itr<T>& bnd,
                                    clip_type cliptype,
                                    fill_type subject_fill_type,
                                    fill_type clip_fill_type,
-                                   ring_manager<T>& rings,
+                                   ring_manager<T>& manager,
                                    active_bound_list<T>& active_bounds) {
-    if (bndMaxPair == active_bounds.end()) {
-        if ((*bnd)->ring) {
-            add_point_to_ring(*(*bnd), (*bnd)->current_edge->top, rings);
-        }
-        return active_bounds.erase(bnd);
-    }
     auto bnd_next = std::next(bnd);
-    auto return_bnd = bnd_next;
+    auto return_bnd = bnd;
     bool skipped = false;
     while (bnd_next != active_bounds.end() && bnd_next != bndMaxPair) {
+        if (*bnd_next == nullptr) {
+            ++bnd_next;
+            continue;
+        }
         skipped = true;
-        intersect_bounds(bnd, bnd_next, (*bnd)->current_edge->top, cliptype, subject_fill_type,
+        intersect_bounds(*(*bnd), *(*bnd_next), (*bnd)->current_edge->top, cliptype,
-                         clip_fill_type, rings, active_bounds);
+                         subject_fill_type, clip_fill_type, manager, active_bounds);
-        swap_positions_in_ABL(bnd, bnd_next, active_bounds);
+        std::iter_swap(bnd, bnd_next);
-        bnd_next = std::next(bnd);
+        bnd = bnd_next;
+        ++bnd_next;
     }
 
-    if (!(*bnd)->ring && !(*bndMaxPair)->ring) {
+    if ((*bnd)->ring && (*bndMaxPair)->ring) {
-        active_bounds.erase(bndMaxPair);
+        add_local_maximum_point(*(*bnd), *(*bndMaxPair), (*bnd)->current_edge->top, manager,
-    } else if ((*bnd)->ring && (*bndMaxPair)->ring) {
+                                active_bounds);
-        add_local_maximum_point(bnd, bndMaxPair, (*bnd)->current_edge->top, rings, active_bounds);
+    } else if ((*bnd)->ring || (*bndMaxPair)->ring) {
-        active_bounds.erase(bndMaxPair);
-    } else {
         throw std::runtime_error("DoMaxima error");
     }
-    auto prev_itr = active_bounds.erase(bnd);
+    *bndMaxPair = nullptr;
-    if (skipped) {
+    *bnd = nullptr;
-        return return_bnd;
+    if (!skipped) {
-    } else {
+        ++return_bnd;
-        return prev_itr;
     }
+    return return_bnd;
 }
 
 template <typename T>
@@ -63,12 +60,16 @@ void process_edges_at_top_of_scanbeam(T top_y,
                                       scanbeam_list<T>& scanbeam,
                                       local_minimum_ptr_list<T> const& minima_sorted,
                                       local_minimum_ptr_list_itr<T>& current_lm,
-                                      ring_manager<T>& rings,
+                                      ring_manager<T>& manager,
                                       clip_type cliptype,
                                       fill_type subject_fill_type,
                                       fill_type clip_fill_type) {
 
     for (auto bnd = active_bounds.begin(); bnd != active_bounds.end();) {
+        if (*bnd == nullptr) {
+            ++bnd;
+            continue;
+        }
         // 1. Process maxima, treating them as if they are "bent" horizontal edges,
         // but exclude maxima with horizontal edges.
 
@@ -81,7 +82,7 @@ void process_edges_at_top_of_scanbeam(T top_y,
                               is_maxima(bnd_max_pair, top_y));
             if (is_maxima_edge) {
                 bnd = do_maxima(bnd, bnd_max_pair, cliptype, subject_fill_type, clip_fill_type,
-                                rings, active_bounds);
+                                manager, active_bounds);
                 continue;
             }
         }
@@ -89,23 +90,25 @@ void process_edges_at_top_of_scanbeam(T top_y,
         // 2. Promote horizontal edges.
         if (is_intermediate(bnd, top_y) && next_edge_is_horizontal<T>(bnd)) {
             if ((*bnd)->ring) {
-                insert_hot_pixels_in_path(*(*bnd), (*bnd)->current_edge->top, rings, false);
+                insert_hot_pixels_in_path(*(*bnd), (*bnd)->current_edge->top, manager, false);
             }
-            next_edge_in_bound(bnd, scanbeam);
+            next_edge_in_bound(*(*bnd), scanbeam);
             if ((*bnd)->ring) {
-                add_point_to_ring(*(*bnd), (*bnd)->current_edge->bot, rings);
+                add_point_to_ring(*(*bnd), (*bnd)->current_edge->bot, manager);
             }
         } else {
             (*bnd)->current_x = get_current_x(*((*bnd)->current_edge), top_y);
         }
-
         ++bnd;
     }
+    active_bounds.erase(std::remove(active_bounds.begin(), active_bounds.end(), nullptr),
+                        active_bounds.end());
 
-    insert_horizontal_local_minima_into_ABL(top_y, minima_sorted, current_lm, active_bounds, rings,
+    insert_horizontal_local_minima_into_ABL(top_y, minima_sorted, current_lm, active_bounds,
-                                            scanbeam, cliptype, subject_fill_type, clip_fill_type);
+                                            manager, scanbeam, cliptype, subject_fill_type,
+                                            clip_fill_type);
 
-    process_horizontals(top_y, active_bounds, rings, scanbeam, cliptype, subject_fill_type,
+    process_horizontals(top_y, active_bounds, manager, scanbeam, cliptype, subject_fill_type,
                         clip_fill_type);
 
     // 4. Promote intermediate vertices
@@ -113,10 +116,9 @@ void process_edges_at_top_of_scanbeam(T top_y,
     for (auto bnd = active_bounds.begin(); bnd != active_bounds.end(); ++bnd) {
         if (is_intermediate(bnd, top_y)) {
             if ((*bnd)->ring) {
-                add_point_to_ring(*(*bnd), (*bnd)->current_edge->top, rings);
+                add_point_to_ring(*(*bnd), (*bnd)->current_edge->top, manager);
-                insert_hot_pixels_in_path(*(*bnd), (*bnd)->current_edge->top, rings, false);
             }
-            next_edge_in_bound(bnd, scanbeam);
+            next_edge_in_bound(*(*bnd), scanbeam);
         }
     }
 }

mapbox/geometry/wagyu/quick_clip.hpp

@@ -18,23 +18,23 @@ mapbox::geometry::point<T> intersect(mapbox::geometry::point<T> a,
     switch (edge) {
     case 0:
         return mapbox::geometry::point<T>(
-            static_cast<T>(a.x + static_cast<double>(b.x - a.x) * (box.min.y - a.y) / (b.y - a.y)),
+            mapbox::geometry::wagyu::wround<T>(static_cast<double>(a.x) + static_cast<double>(b.x - a.x) * static_cast<double>(box.min.y - a.y) / static_cast<double>(b.y - a.y)),
             box.min.y);
 
     case 1:
         return mapbox::geometry::point<T>(
             box.max.x,
-            static_cast<T>(a.y + static_cast<double>(b.y - a.y) * (box.max.x - a.x) / (b.x - a.x)));
+            mapbox::geometry::wagyu::wround<T>(static_cast<double>(a.y) + static_cast<double>(b.y - a.y) * static_cast<double>(box.max.x - a.x) / static_cast<double>(b.x - a.x)));
 
     case 2:
         return mapbox::geometry::point<T>(
-            static_cast<T>(a.x + static_cast<double>(b.x - a.x) * (box.max.y - a.y) / (b.y - a.y)),
+            mapbox::geometry::wagyu::wround<T>(static_cast<double>(a.x) + static_cast<double>(b.x - a.x) * static_cast<double>(box.max.y - a.y) / static_cast<double>(b.y - a.y)),
             box.max.y);
 
     default: // case 3
         return mapbox::geometry::point<T>(
             box.min.x,
-            static_cast<T>(a.y + static_cast<double>(b.y - a.y) * (box.min.x - a.x) / (b.x - a.x)));
+            mapbox::geometry::wagyu::wround<T>(static_cast<double>(a.y) + static_cast<double>(b.y - a.y) * static_cast<double>(box.min.x - a.x) / static_cast<double>(b.x - a.x)));
     }
 }
 

mapbox/geometry/wagyu/ring.hpp

@@ -5,6 +5,7 @@
 #include <deque>
 #include <list>
 #include <map>
+#include <mapbox/geometry/box.hpp>
 #include <mapbox/geometry/wagyu/point.hpp>
 #include <set>
 #include <sstream>
@@ -29,35 +30,117 @@ namespace mapbox {
 namespace geometry {
 namespace wagyu {
 
+template <typename T>
+double area_from_point(point_ptr<T> op, std::size_t& size, mapbox::geometry::box<T>& bbox) {
+    point_ptr<T> startOp = op;
+    size = 0;
+    double a = 0.0;
+    T min_x = op->x;
+    T max_x = op->x;
+    T min_y = op->y;
+    T max_y = op->y;
+    do {
+        ++size;
+        if (op->x > max_x) {
+            max_x = op->x;
+        } else if (op->x < min_x) {
+            min_x = op->x;
+        }
+        if (op->y > max_y) {
+            max_y = op->y;
+        } else if (op->y < min_y) {
+            min_y = op->y;
+        }
+        a += static_cast<double>(op->prev->x + op->x) * static_cast<double>(op->prev->y - op->y);
+        op = op->next;
+    } while (op != startOp);
+    bbox.min.x = min_x;
+    bbox.max.x = max_x;
+    bbox.min.y = min_y;
+    bbox.max.y = max_y;
+    return a * 0.5;
+}
+
 // NOTE: ring and ring_ptr are forward declared in wagyu/point.hpp
 
 template <typename T>
 using ring_vector = std::vector<ring_ptr<T>>;
 
-template <typename T>
-using ring_list = std::list<ring_ptr<T>>;
-
 template <typename T>
 struct ring {
     std::size_t ring_index; // To support unset 0 is undefined and indexes offset by 1
-    std::size_t size;
+
-    double area;
+    std::size_t size_;             // number of points in the ring
+    double area_;                  // area of the ring
+    mapbox::geometry::box<T> bbox; // bounding box of the ring
+
     ring_ptr<T> parent;
-    ring_list<T> children;
+    ring_vector<T> children;
+
     point_ptr<T> points;
     point_ptr<T> bottom_point;
+    bool is_hole_;
+    bool corrected;
 
     ring(ring const&) = delete;
     ring& operator=(ring const&) = delete;
 
     ring()
         : ring_index(0),
-          size(0),
+          size_(0),
-          area(std::numeric_limits<double>::quiet_NaN()),
+          area_(std::numeric_limits<double>::quiet_NaN()),
+          bbox({ 0, 0 }, { 0, 0 }),
           parent(nullptr),
           children(),
           points(nullptr),
-          bottom_point(nullptr) {
+          bottom_point(nullptr),
+          is_hole_(false),
+          corrected(false) {
+    }
+
+    void reset_stats() {
+        area_ = std::numeric_limits<double>::quiet_NaN();
+        is_hole_ = false;
+        bbox.min.x = 0;
+        bbox.min.y = 0;
+        bbox.max.x = 0;
+        bbox.max.y = 0;
+        size_ = 0;
+    }
+
+    void recalculate_stats() {
+        if (points != nullptr) {
+            area_ = area_from_point(points, size_, bbox);
+            is_hole_ = !(area_ > 0.0);
+        }
+    }
+
+    void set_stats(double a, std::size_t s, mapbox::geometry::box<T> const& b) {
+        bbox = b;
+        area_ = a;
+        size_ = s;
+        is_hole_ = !(area_ > 0.0);
+    }
+
+    double area() {
+        if (std::isnan(area_)) {
+            recalculate_stats();
+        }
+        return area_;
+    }
+
+    bool is_hole() {
+        if (std::isnan(area_)) {
+            recalculate_stats();
+        }
+        return is_hole_;
+    }
+
+    std::size_t size() {
+        if (std::isnan(area_)) {
+            recalculate_stats();
+        }
+        return size_;
     }
 };
 
@@ -73,8 +156,8 @@ using hot_pixel_rev_itr = typename hot_pixel_vector<T>::reverse_iterator;
 template <typename T>
 struct ring_manager {
 
-    ring_list<T> children;
+    ring_vector<T> children;
-    std::vector<point_ptr<T>> all_points;
+    point_vector<T> all_points;
     hot_pixel_vector<T> hot_pixels;
     hot_pixel_itr<T> current_hp_itr;
     std::deque<point<T>> points;
@@ -104,10 +187,10 @@ void preallocate_point_memory(ring_manager<T>& rings, std::size_t size) {
 }
 
 template <typename T>
-ring_ptr<T> create_new_ring(ring_manager<T>& rings) {
+ring_ptr<T> create_new_ring(ring_manager<T>& manager) {
-    rings.rings.emplace_back();
+    manager.rings.emplace_back();
-    ring_ptr<T> result = &rings.rings.back();
+    ring_ptr<T> result = &manager.rings.back();
-    result->ring_index = rings.index++;
+    result->ring_index = manager.index++;
     return result;
 }
 
@@ -144,79 +227,188 @@ point_ptr<T> create_new_point(ring_ptr<T> r,
 }
 
 template <typename T>
-void ring1_child_of_ring2(ring_ptr<T> ring1, ring_ptr<T> ring2, ring_manager<T>& manager) {
+void set_to_children(ring_ptr<T> r, ring_vector<T>& children) {
-    assert(ring1 != ring2);
+    for (auto& c : children) {
-    if (ring1->parent == ring2) {
+        if (c == nullptr) {
+            c = r;
             return;
         }
-    if (ring1->parent == nullptr) {
-        manager.children.remove(ring1);
-    } else {
-        ring1->parent->children.remove(ring1);
     }
-    if (ring2 == nullptr) {
+    children.push_back(r);
-        ring1->parent = nullptr;
+}
-        manager.children.push_back(ring1);
+
-    } else {
+template <typename T>
-        ring1->parent = ring2;
+void remove_from_children(ring_ptr<T> r, ring_vector<T>& children) {
-        ring2->children.push_back(ring1);
+    for (auto& c : children) {
+        if (c == r) {
+            c = nullptr;
+            return;
+        }
     }
 }
 
 template <typename T>
-void ring1_sibling_of_ring2(ring_ptr<T> ring1, ring_ptr<T> ring2, ring_manager<T>& manager) {
+void assign_as_child(ring_ptr<T> new_ring, ring_ptr<T> parent, ring_manager<T>& manager) {
-    assert(ring1 != ring2);
+    // Assigning as a child assumes that this is
-    if (ring1->parent == ring2->parent) {
+    // a brand new ring. Therefore it does
+    // not have any existing relationships
+    if ((parent == nullptr && new_ring->is_hole()) ||
+        (parent != nullptr && new_ring->is_hole() == parent->is_hole())) {
+        throw std::runtime_error(
+            "Trying to assign a child that is the same orientation as the parent");
+    }
+    auto& children = parent == nullptr ? manager.children : parent->children;
+    set_to_children(new_ring, children);
+    new_ring->parent = parent;
+}
+
+template <typename T>
+void reassign_as_child(ring_ptr<T> ring, ring_ptr<T> parent, ring_manager<T>& manager) {
+    // Reassigning a ring assumes it already
+    // has an existing parent
+    if ((parent == nullptr && ring->is_hole()) ||
+        (parent != nullptr && ring->is_hole() == parent->is_hole())) {
+        throw std::runtime_error(
+            "Trying to re-assign a child that is the same orientation as the parent");
+    }
+
+    // Remove the old child relationship
+    auto& old_children = ring->parent == nullptr ? manager.children : ring->parent->children;
+    remove_from_children(ring, old_children);
+
+    // Add new child relationship
+    auto& children = parent == nullptr ? manager.children : parent->children;
+    set_to_children(ring, children);
+    ring->parent = parent;
+}
+
+template <typename T>
+void assign_as_sibling(ring_ptr<T> new_ring, ring_ptr<T> sibling, ring_manager<T>& manager) {
+    // Assigning as a sibling assumes that this is
+    // a brand new ring. Therefore it does
+    // not have any existing relationships
+    if (new_ring->is_hole() != sibling->is_hole()) {
+        throw std::runtime_error(
+            "Trying to assign to be a sibling that is not the same orientation as the sibling");
+    }
+    auto& children = sibling->parent == nullptr ? manager.children : sibling->parent->children;
+    set_to_children(new_ring, children);
+    new_ring->parent = sibling->parent;
+}
+
+template <typename T>
+void reassign_as_sibling(ring_ptr<T> ring, ring_ptr<T> sibling, ring_manager<T>& manager) {
+    if (ring->parent == sibling->parent) {
         return;
     }
-    if (ring1->parent == nullptr) {
+    // Assigning as a sibling assumes that this is
-        manager.children.remove(ring1);
+    // a brand new ring. Therefore it does
-    } else {
+    // not have any existing relationships
-        ring1->parent->children.remove(ring1);
+    if (ring->is_hole() != sibling->is_hole()) {
+        throw std::runtime_error(
+            "Trying to assign to be a sibling that is not the same orientation as the sibling");
     }
-    if (ring2->parent == nullptr) {
+    // Remove the old child relationship
-        manager.children.push_back(ring1);
+    auto& old_children = ring->parent == nullptr ? manager.children : ring->parent->children;
-    } else {
+    remove_from_children(ring, old_children);
-        ring2->parent->children.push_back(ring1);
+    // Add new relationship
-    }
+    auto& children = sibling->parent == nullptr ? manager.children : sibling->parent->children;
-    ring1->parent = ring2->parent;
+    set_to_children(ring, children);
+    ring->parent = sibling->parent;
 }
 
 template <typename T>
 void ring1_replaces_ring2(ring_ptr<T> ring1, ring_ptr<T> ring2, ring_manager<T>& manager) {
     assert(ring1 != ring2);
-    if (ring2->parent == nullptr) {
+    auto& ring1_children = ring1 == nullptr ? manager.children : ring1->children;
-        manager.children.remove(ring2);
-    } else {
-        ring2->parent->children.remove(ring2);
-    }
     for (auto& c : ring2->children) {
+        if (c == nullptr) {
+            continue;
+        }
         c->parent = ring1;
+        set_to_children(c, ring1_children);
+        c = nullptr;
     }
-    if (ring1 == nullptr) {
+    // Remove the old child relationship
-        manager.children.splice(manager.children.end(), ring2->children);
+    auto& old_children = ring2->parent == nullptr ? manager.children : ring2->parent->children;
-    } else {
+    remove_from_children(ring2, old_children);
-        ring1->children.splice(ring1->children.end(), ring2->children);
+    ring2->points = nullptr;
-    }
+    ring2->reset_stats();
-    ring2->parent = nullptr;
 }
 
 template <typename T>
-void remove_ring(ring_ptr<T> r, ring_manager<T>& manager) {
+void remove_points(point_ptr<T> pt) {
-    if (r->parent == nullptr) {
+    if (pt != nullptr) {
-        manager.children.remove(r);
+        pt->prev->next = nullptr;
+        while (pt != nullptr) {
+            point_ptr<T> tmp = pt;
+            pt = pt->next;
+            tmp->next = nullptr;
+            tmp->prev = nullptr;
+            tmp->ring = nullptr;
+        }
+    }
+}
+
+template <typename T>
+void remove_ring_and_points(ring_ptr<T> r,
+                            ring_manager<T>& manager,
+                            bool remove_children = true,
+                            bool remove_from_parent = true) {
+    // Removes a ring and any children that might be
+    // under that ring.
     for (auto& c : r->children) {
-            c->parent = nullptr;
+        if (c == nullptr) {
+            continue;
         }
-        manager.children.splice(manager.children.end(), r->children);
+        if (remove_children) {
-    } else {
+            remove_ring_and_points(c, manager, true, false);
-        r->parent->children.remove(r);
+        }
+        c = nullptr;
+    }
+    if (remove_from_parent) {
+        // Remove the old child relationship
+        auto& old_children = r->parent == nullptr ? manager.children : r->parent->children;
+        remove_from_children(r, old_children);
+    }
+    point_ptr<T> pt = r->points;
+    if (pt != nullptr) {
+        pt->prev->next = nullptr;
+        while (pt != nullptr) {
+            point_ptr<T> tmp = pt;
+            pt = pt->next;
+            tmp->next = nullptr;
+            tmp->prev = nullptr;
+            tmp->ring = nullptr;
+        }
+    }
+    r->points = nullptr;
+    r->reset_stats();
+}
+
+template <typename T>
+void remove_ring(ring_ptr<T> r,
+                 ring_manager<T>& manager,
+                 bool remove_children = true,
+                 bool remove_from_parent = true) {
+    // Removes a ring and any children that might be
+    // under that ring.
     for (auto& c : r->children) {
-            c->parent = r->parent;
+        if (c == nullptr) {
+            continue;
         }
-        r->parent->children.splice(r->parent->children.end(), r->children);
+        if (remove_children) {
-        r->parent = nullptr;
+            remove_ring(c, manager, true, false);
         }
+        c = nullptr;
+    }
+    if (remove_from_parent) {
+        // Remove the old child relationship
+        auto& old_children = r->parent == nullptr ? manager.children : r->parent->children;
+        remove_from_children(r, old_children);
+    }
+    r->points = nullptr;
+    r->reset_stats();
 }
 
 template <typename T>
@@ -234,6 +426,10 @@ inline std::size_t ring_depth(ring_ptr<T> r) {
 
 template <typename T>
 inline bool ring_is_hole(ring_ptr<T> r) {
+    // This is different then the "normal" way of determing if
+    // a ring is a hole or not because it uses the depth of the
+    // the ring to determine if it is a hole or not. This is only done
+    // intially when rings are output from Vatti.
     return ring_depth(r) & 1;
 }
 
@@ -263,17 +459,6 @@ void init(const_point_ptr<T>& node) {
     set_prev(node, node);
 }
 
-template <typename T>
-std::size_t point_count(const const_point_ptr<T>& orig_node) {
-    std::size_t size = 0;
-    point_ptr<T> n = orig_node;
-    do {
-        n = get_next(n);
-        ++size;
-    } while (n != orig_node);
-    return size;
-}
-
 template <typename T>
 void link_before(point_ptr<T>& node, point_ptr<T>& new_node) {
     point_ptr<T> prev_node = get_prev(node);
@@ -325,33 +510,11 @@ void reverse_ring(point_ptr<T> pp) {
     } while (pp1 != pp);
 }
 
-template <typename T>
-double area_from_point(point_ptr<T> op, std::size_t& size) {
-    point_ptr<T> startOp = op;
-    size = 1;
-    double a = 0.0;
-    do {
-        ++size;
-        a += static_cast<double>(op->prev->x + op->x) * static_cast<double>(op->prev->y - op->y);
-        op = op->next;
-    } while (op != startOp);
-    return a * 0.5;
-}
-
-template <typename T>
-double area(ring_ptr<T> r) {
-    assert(r != nullptr);
-    if (std::isnan(r->area)) {
-        r->area = area_from_point(r->points, r->size);
-    }
-    return r->area;
-}
-
 #ifdef DEBUG
 
 template <class charT, class traits, typename T>
 inline std::basic_ostream<charT, traits>& operator<<(std::basic_ostream<charT, traits>& out,
-                                                     const ring<T>& r) {
+                                                     ring<T>& r) {
     out << "  ring_index: " << r.ring_index << std::endl;
     if (!r.parent) {
         // out << "  parent_ring ptr: nullptr" << std::endl;
@@ -368,7 +531,7 @@ inline std::basic_ostream<charT, traits>& operator<<(std::basic_ostream<charT, t
     }
     auto pt_itr = r.points;
     if (pt_itr) {
-        out << "  area: " << r.area << std::endl;
+        out << "  area: " << r.area() << std::endl;
         out << "  points:" << std::endl;
         out << "      [[[" << pt_itr->x << "," << pt_itr->y << "],";
         pt_itr = pt_itr->next;
@@ -384,6 +547,22 @@ inline std::basic_ostream<charT, traits>& operator<<(std::basic_ostream<charT, t
     return out;
 }
 
+template <typename T>
+std::string debug_ring_addresses(ring_ptr<T> r) {
+    std::ostringstream out;
+    out << "Ring: " << r->ring_index << std::endl;
+    if (r->points == nullptr) {
+        out << "   Ring has no points" << std::endl;
+        return out.str();
+    }
+    auto pt_itr = r->points;
+    do {
+        out << "    [" << pt_itr->x << "," << pt_itr->y << "] - " << pt_itr << std::endl;
+        pt_itr = pt_itr->next;
+    } while (pt_itr != r->points);
+    return out.str();
+}
+
 template <typename T>
 std::string output_as_polygon(ring_ptr<T> r) {
     std::ostringstream out;
@@ -399,6 +578,9 @@ std::string output_as_polygon(ring_ptr<T> r) {
         }
         out << "[" << pt_itr->x << "," << pt_itr->y << "]]";
         for (auto const& c : r->children) {
+            if (c == nullptr) {
+                continue;
+            }
             pt_itr = c->points;
             if (pt_itr) {
                 out << ",[[" << pt_itr->x << "," << pt_itr->y << "],";
@@ -420,22 +602,10 @@ std::string output_as_polygon(ring_ptr<T> r) {
 
 template <class charT, class traits, typename T>
 inline std::basic_ostream<charT, traits>& operator<<(std::basic_ostream<charT, traits>& out,
-                                                     const ring_list<T>& rings) {
+                                                     ring_vector<T>& rings) {
-    out << "START RING LIST" << std::endl;
-    for (auto& r : rings) {
-        out << " ring: " << r->ring_index << " - " << r << std::endl;
-        out << *r;
-    }
-    out << "END RING LIST" << std::endl;
-    return out;
-}
-
-template <class charT, class traits, typename T>
-inline std::basic_ostream<charT, traits>& operator<<(std::basic_ostream<charT, traits>& out,
-                                                     const ring_vector<T>& rings) {
     out << "START RING VECTOR" << std::endl;
     for (auto& r : rings) {
-        if (!r->points) {
+        if (r == nullptr || !r->points) {
             continue;
         }
         out << " ring: " << r->ring_index << " - " << r << std::endl;
@@ -447,7 +617,7 @@ inline std::basic_ostream<charT, traits>& operator<<(std::basic_ostream<charT, t
 
 template <class charT, class traits, typename T>
 inline std::basic_ostream<charT, traits>& operator<<(std::basic_ostream<charT, traits>& out,
-                                                     const std::deque<ring<T>>& rings) {
+                                                     std::deque<ring<T>>& rings) {
     out << "START RING VECTOR" << std::endl;
     for (auto& r : rings) {
         if (!r.points) {
@@ -462,7 +632,7 @@ inline std::basic_ostream<charT, traits>& operator<<(std::basic_ostream<charT, t
 
 template <class charT, class traits, typename T>
 inline std::basic_ostream<charT, traits>& operator<<(std::basic_ostream<charT, traits>& out,
-                                                     const hot_pixel_vector<T>& hp_vec) {
+                                                     hot_pixel_vector<T>& hp_vec) {
     out << "Hot Pixels: " << std::endl;
     for (auto& hp : hp_vec) {
         out << hp << std::endl;

mapbox/geometry/wagyu/ring_util.hpp

@@ -15,7 +15,7 @@
 // free(strs);
 #endif
 
-#include <queue>
+#include <algorithm>
 
 #include <mapbox/geometry/wagyu/active_bound_list.hpp>
 #include <mapbox/geometry/wagyu/config.hpp>
@@ -28,55 +28,33 @@ namespace geometry {
 namespace wagyu {
 
 template <typename T>
-void set_hole_state(active_bound_list_itr<T>& bnd,
+void set_hole_state(bound<T>& bnd,
-                    active_bound_list<T>& active_bounds,
+                    active_bound_list<T> const& active_bounds,
                     ring_manager<T>& rings) {
-    auto bnd2 = active_bound_list_rev_itr<T>(bnd);
+    auto bnd_itr = std::find(active_bounds.rbegin(), active_bounds.rend(), &bnd);
+    ++bnd_itr;
     bound_ptr<T> bndTmp = nullptr;
     // Find first non line ring to the left of current bound.
-    while (bnd2 != active_bounds.rend()) {
+    while (bnd_itr != active_bounds.rend()) {
-        if ((*bnd2)->ring && (*bnd2)->winding_delta != 0) {
+        if (*bnd_itr == nullptr) {
+            ++bnd_itr;
+            continue;
+        }
+        if ((*bnd_itr)->ring) {
             if (!bndTmp) {
-                bndTmp = (*bnd2);
+                bndTmp = (*bnd_itr);
-            } else if (bndTmp->ring == (*bnd2)->ring) {
+            } else if (bndTmp->ring == (*bnd_itr)->ring) {
                 bndTmp = nullptr;
             }
         }
-        ++bnd2;
+        ++bnd_itr;
     }
     if (!bndTmp) {
-        (*bnd)->ring->parent = nullptr;
+        bnd.ring->parent = nullptr;
-        rings.children.push_back((*bnd)->ring);
+        rings.children.push_back(bnd.ring);
     } else {
-        (*bnd)->ring->parent = bndTmp->ring;
+        bnd.ring->parent = bndTmp->ring;
-        bndTmp->ring->children.push_back((*bnd)->ring);
+        bndTmp->ring->children.push_back(bnd.ring);
-    }
-}
-
-template <typename T>
-void set_hole_state(active_bound_list_rev_itr<T>& bnd,
-                    active_bound_list<T>& active_bounds,
-                    ring_manager<T>& rings) {
-    auto bnd2 = std::next(bnd);
-    bound_ptr<T> bndTmp = nullptr;
-    // Find first non line ring to the left of current bound.
-    while (bnd2 != active_bounds.rend()) {
-        if ((*bnd2)->ring && (*bnd2)->winding_delta != 0) {
-            if (!bndTmp) {
-                bndTmp = (*bnd2);
-            } else if (bndTmp->ring == (*bnd2)->ring) {
-                bndTmp = nullptr;
-            }
-        }
-        ++bnd2;
-    }
-
-    if (!bndTmp) {
-        (*bnd)->ring->parent = nullptr;
-        rings.children.push_back((*bnd)->ring);
-    } else {
-        (*bnd)->ring->parent = bndTmp->ring;
-        bndTmp->ring->children.push_back((*bnd)->ring);
     }
 }
 
@@ -328,29 +306,16 @@ void add_to_hot_pixels(mapbox::geometry::point<T> const& pt, ring_manager<T>& ri
 }
 
 template <typename T>
-void add_first_point(active_bound_list_itr<T>& bnd,
+void add_first_point(bound<T>& bnd,
                      active_bound_list<T>& active_bounds,
                      mapbox::geometry::point<T> const& pt,
                      ring_manager<T>& rings) {
 
     ring_ptr<T> r = create_new_ring(rings);
-    (*bnd)->ring = r;
+    bnd.ring = r;
     r->points = create_new_point(r, pt, rings);
     set_hole_state(bnd, active_bounds, rings);
-    (*bnd)->last_point = pt;
+    bnd.last_point = pt;
-}
-
-template <typename T>
-void add_first_point(active_bound_list_rev_itr<T>& bnd,
-                     active_bound_list<T>& active_bounds,
-                     mapbox::geometry::point<T> const& pt,
-                     ring_manager<T>& rings) {
-    ring_ptr<T> r = create_new_ring(rings);
-    // no ring currently set!
-    (*bnd)->ring = r;
-    r->points = create_new_point(r, pt, rings);
-    set_hole_state(bnd, active_bounds, rings);
-    (*bnd)->last_point = pt;
 }
 
 template <typename T>
@@ -377,64 +342,35 @@ void add_point_to_ring(bound<T>& bnd,
 }
 
 template <typename T>
-void add_point(active_bound_list_itr<T>& bnd,
+void add_point(bound<T>& bnd,
                active_bound_list<T>& active_bounds,
                mapbox::geometry::point<T> const& pt,
                ring_manager<T>& rings) {
-    if (!(*bnd)->ring) {
+    if (bnd.ring == nullptr) {
         add_first_point(bnd, active_bounds, pt, rings);
     } else {
-        add_point_to_ring(*(*bnd), pt, rings);
+        add_point_to_ring(bnd, pt, rings);
     }
 }
 
 template <typename T>
-void add_point(active_bound_list_rev_itr<T>& bnd,
+void add_local_minimum_point(bound<T>& b1,
+                             bound<T>& b2,
                              active_bound_list<T>& active_bounds,
                              mapbox::geometry::point<T> const& pt,
                              ring_manager<T>& rings) {
-    if (!(*bnd)->ring) {
+    if (is_horizontal(*b2.current_edge) || (b1.current_edge->dx > b2.current_edge->dx)) {
-        add_first_point(bnd, active_bounds, pt, rings);
-    } else {
-        add_point_to_ring(*(*bnd), pt, rings);
-    }
-}
-
-template <typename T>
-void add_local_minimum_point(active_bound_list_itr<T> b1,
-                             active_bound_list_itr<T> b2,
-                             active_bound_list<T>& active_bounds,
-                             mapbox::geometry::point<T> const& pt,
-                             ring_manager<T>& rings) {
-    active_bound_list_itr<T> b;
-    active_bound_list_rev_itr<T> prev_bound;
-    active_bound_list_rev_itr<T> prev_b1(b1);
-    active_bound_list_rev_itr<T> prev_b2(b2);
-    if (is_horizontal(*((*b2)->current_edge)) ||
-        ((*b1)->current_edge->dx > (*b2)->current_edge->dx)) {
         add_point(b1, active_bounds, pt, rings);
-        (*b2)->last_point = pt;
+        b2.last_point = pt;
-        (*b2)->ring = (*b1)->ring;
+        b2.ring = b1.ring;
-        (*b1)->side = edge_left;
+        b1.side = edge_left;
-        (*b2)->side = edge_right;
+        b2.side = edge_right;
-        b = b1;
-        if (prev_b1 != active_bounds.rend() && std::prev(b) == b2) {
-            prev_bound = prev_b2;
-        } else {
-            prev_bound = prev_b1;
-        }
     } else {
         add_point(b2, active_bounds, pt, rings);
-        (*b1)->last_point = pt;
+        b1.last_point = pt;
-        (*b1)->ring = (*b2)->ring;
+        b1.ring = b2.ring;
-        (*b1)->side = edge_right;
+        b1.side = edge_right;
-        (*b2)->side = edge_left;
+        b2.side = edge_left;
-        b = b2;
-        if (prev_b2 != active_bounds.rend() && std::prev(b) == b1) {
-            prev_bound = prev_b1;
-        } else {
-            prev_bound = prev_b2;
-        }
     }
 }
 
@@ -443,7 +379,7 @@ inline double get_dx(point<T> const& pt1, point<T> const& pt2) {
     if (pt1.y == pt2.y) {
         return std::numeric_limits<double>::infinity();
     } else {
-        return static_cast<double>(pt2.x - pt2.x) / static_cast<double>(pt2.y - pt1.y);
+        return static_cast<double>(pt2.x - pt1.x) / static_cast<double>(pt2.y - pt1.y);
     }
 }
 
@@ -476,7 +412,8 @@ bool first_is_bottom_point(const_point_ptr<T> btmPt1, const_point_ptr<T> btmPt2)
     if (values_are_equal(std::max(dx1p, dx1n), std::max(dx2p, dx2n)) &&
         values_are_equal(std::min(dx1p, dx1n), std::min(dx2p, dx2n))) {
         std::size_t s = 0;
-        return area_from_point(btmPt1, s) > 0.0; // if otherwise identical use orientation
+        mapbox::geometry::box<T> bbox({ 0, 0 }, { 0, 0 });
+        return area_from_point(btmPt1, s, bbox) > 0.0; // if otherwise identical use orientation
     } else {
         return (greater_than_or_equal(dx1p, dx2p) && greater_than_or_equal(dx1p, dx2n)) ||
                (greater_than_or_equal(dx1n, dx2p) && greater_than_or_equal(dx1n, dx2n));
@@ -569,13 +506,13 @@ void update_points_ring(ring_ptr<T> ring) {
 }
 
 template <typename T>
-void append_ring(active_bound_list_itr<T>& b1,
+void append_ring(bound<T>& b1,
-                 active_bound_list_itr<T>& b2,
+                 bound<T>& b2,
                  active_bound_list<T>& active_bounds,
                  ring_manager<T>& manager) {
     // get the start and ends of both output polygons ...
-    ring_ptr<T> outRec1 = (*b1)->ring;
+    ring_ptr<T> outRec1 = b1.ring;
-    ring_ptr<T> outRec2 = (*b2)->ring;
+    ring_ptr<T> outRec2 = b2.ring;
 
     ring_ptr<T> keep_ring;
     bound_ptr<T> keep_bound;
@@ -583,24 +520,24 @@ void append_ring(active_bound_list_itr<T>& b1,
     bound_ptr<T> remove_bound;
     if (ring1_child_below_ring2(outRec1, outRec2)) {
         keep_ring = outRec2;
-        keep_bound = *b2;
+        keep_bound = &b2;
         remove_ring = outRec1;
-        remove_bound = *b1;
+        remove_bound = &b1;
     } else if (ring1_child_below_ring2(outRec2, outRec1)) {
         keep_ring = outRec1;
-        keep_bound = *b1;
+        keep_bound = &b1;
         remove_ring = outRec2;
-        remove_bound = *b2;
+        remove_bound = &b2;
     } else if (outRec1 == get_lower_most_ring(outRec1, outRec2)) {
         keep_ring = outRec1;
-        keep_bound = *b1;
+        keep_bound = &b1;
         remove_ring = outRec2;
-        remove_bound = *b2;
+        remove_bound = &b2;
     } else {
         keep_ring = outRec2;
-        keep_bound = *b2;
+        keep_bound = &b2;
         remove_ring = outRec1;
-        remove_bound = *b1;
+        remove_bound = &b1;
     }
 
     // get the start and ends of both output polygons and
@@ -665,6 +602,9 @@ void append_ring(active_bound_list_itr<T>& b1,
     remove_bound->ring = nullptr;
 
     for (auto& b : active_bounds) {
+        if (b == nullptr) {
+            continue;
+        }
         if (b->ring == remove_ring) {
             b->ring = keep_ring;
             b->side = keep_bound->side;
@@ -674,18 +614,18 @@ void append_ring(active_bound_list_itr<T>& b1,
 }
 
 template <typename T>
-void add_local_maximum_point(active_bound_list_itr<T>& b1,
+void add_local_maximum_point(bound<T>& b1,
-                             active_bound_list_itr<T>& b2,
+                             bound<T>& b2,
                              mapbox::geometry::point<T> const& pt,
                              ring_manager<T>& rings,
                              active_bound_list<T>& active_bounds) {
-    insert_hot_pixels_in_path(*(*b2), pt, rings, false);
+    insert_hot_pixels_in_path(b2, pt, rings, false);
     add_point(b1, active_bounds, pt, rings);
-    if ((*b1)->ring == (*b2)->ring) {
+    if (b1.ring == b2.ring) {
-        (*b1)->ring = nullptr;
+        b1.ring = nullptr;
-        (*b2)->ring = nullptr;
+        b2.ring = nullptr;
         // I am not certain that order is important here?
-    } else if ((*b1)->ring->ring_index < (*b2)->ring->ring_index) {
+    } else if (b1.ring->ring_index < b2.ring->ring_index) {
         append_ring(b1, b2, active_bounds, rings);
     } else {
         append_ring(b2, b1, active_bounds, rings);
@@ -797,7 +737,7 @@ point_in_polygon_result point_in_polygon(mapbox::geometry::point<double> const&
                     if (value_is_zero(d)) {
                         return point_on_polygon;
                     }
-                    if ((d > 0.0) == (op_next_y > op->y)) {
+                    if ((d > 0.0) == (op_next_y > op_y)) {
                         // Switch between point outside polygon and point inside
                         // polygon
                         if (result == point_outside_polygon) {
@@ -814,7 +754,7 @@ point_in_polygon_result point_in_polygon(mapbox::geometry::point<double> const&
                     if (value_is_zero(d)) {
                         return point_on_polygon;
                     }
-                    if ((d > 0.0) == (op_next_y > op->y)) {
+                    if ((d > 0.0) == (op_next_y > op_y)) {
                         // Switch between point outside polygon and point inside
                         // polygon
                         if (result == point_outside_polygon) {
@@ -831,47 +771,68 @@ point_in_polygon_result point_in_polygon(mapbox::geometry::point<double> const&
     return result;
 }
 
+template <typename T>
+bool is_convex(point_ptr<T> edge) {
+    point_ptr<T> prev = edge->prev;
+    point_ptr<T> next = edge->next;
+    T v1x = edge->x - prev->x;
+    T v1y = edge->y - prev->y;
+    T v2x = next->x - edge->x;
+    T v2y = next->y - edge->y;
+    T cross = v1x * v2y - v2x * v1y;
+    if (cross < 0 && edge->ring->area() > 0) {
+        return true;
+    } else if (cross > 0 && edge->ring->area() < 0) {
+        return true;
+    } else {
+        return false;
+    }
+}
+
+template <typename T>
+mapbox::geometry::point<double> centroid_of_points(point_ptr<T> edge) {
+    point_ptr<T> prev = edge->prev;
+    point_ptr<T> next = edge->next;
+    return { static_cast<double>(prev->x + edge->x + next->x) / 3.0, static_cast<double>(prev->y + edge->y + next->y) / 3.0 };
+}
+
 template <typename T>
 point_in_polygon_result inside_or_outside_special(point_ptr<T> first_pt, point_ptr<T> other_poly) {
 
-    if (value_is_zero(area(first_pt->ring))) {
+    // We are going to loop through all the points
-        return point_inside_polygon;
+    // of the original triangle. The goal is to find a convex edge
-    }
+    // that with its next and previous forms a triangle with its centroid
-    if (value_is_zero(area(other_poly->ring))) {
+    // that is within the first ring. Then we will check the other polygon
-        return point_outside_polygon;
+    // to see if it is within this polygon.
-    }
+    point_ptr<T> itr = first_pt;
-    point_ptr<T> pt = first_pt;
     do {
-        if (*pt == *(pt->prev) || *pt == *(pt->next) || *(pt->next) == *(pt->prev) ||
+        if (is_convex(itr)) {
-            slopes_equal(*(pt->prev), *pt, *(pt->next))) {
+            auto pt = centroid_of_points(itr);
-            pt = pt->next;
+            if (point_inside_polygon == point_in_polygon(pt, first_pt)) {
-            continue;
+                return point_in_polygon(pt, other_poly);
-        }
-        double dx = ((pt->prev->x - pt->x) / 3.0) + ((pt->next->x - pt->x) / 3.0);
-        double dy = ((pt->prev->y - pt->y) / 3.0) + ((pt->next->y - pt->y) / 3.0);
-        mapbox::geometry::point<double> offset_pt(pt->x + dx, pt->y + dy);
-        point_in_polygon_result res = point_in_polygon(offset_pt, pt);
-        if (res != point_inside_polygon) {
-            offset_pt.x = pt->x - dx;
-            offset_pt.y = pt->y - dy;
-            res = point_in_polygon(offset_pt, pt);
-            if (res != point_inside_polygon) {
-                pt = pt->next;
-                continue;
             }
         }
-        res = point_in_polygon(offset_pt, other_poly);
+        itr = itr->next;
-        if (res == point_on_polygon) {
+    } while (itr != first_pt);
-            pt = pt->next;
+
-            continue;
+    throw std::runtime_error("Could not find a point within the polygon to test");
 }
-        return res;
+
-    } while (pt != first_pt);
+template <typename T>
-    return point_inside_polygon;
+bool box2_contains_box1(mapbox::geometry::box<T> const& box1,
+                        mapbox::geometry::box<T> const& box2) {
+    return (box2.max.x >= box1.max.x && box2.max.y >= box1.max.y && box2.min.x <= box1.min.x &&
+            box2.min.y <= box1.min.y);
 }
 
 template <typename T>
 bool poly2_contains_poly1(ring_ptr<T> ring1, ring_ptr<T> ring2) {
+    if (!box2_contains_box1(ring1->bbox, ring2->bbox)) {
+        return false;
+    }
+    if (std::fabs(ring2->area()) < std::fabs(ring1->area())) {
+        return false;
+    }
     point_ptr<T> outpt1 = ring1->points->next;
     point_ptr<T> outpt2 = ring2->points->next;
     point_ptr<T> op = outpt1;
@@ -886,21 +847,6 @@ bool poly2_contains_poly1(ring_ptr<T> ring1, ring_ptr<T> ring2) {
     point_in_polygon_result res = inside_or_outside_special(outpt1, outpt2);
     return res == point_inside_polygon;
 }
-
-template <typename T>
-void dispose_out_points(point_ptr<T>& pp) {
-    if (pp == nullptr) {
-        return;
-    }
-    pp->prev->next = nullptr;
-    while (pp) {
-        point_ptr<T> tmpPp = pp;
-        pp = pp->next;
-        tmpPp->next = tmpPp;
-        tmpPp->prev = tmpPp;
-        tmpPp->ring = nullptr;
-    }
-}
 }
 }
 }

mapbox/geometry/wagyu/scanbeam.hpp

@@ -1,27 +1,26 @@
 #pragma once
 
-#include <queue>
-
 #include <mapbox/geometry/wagyu/config.hpp>
 #include <mapbox/geometry/wagyu/local_minimum.hpp>
 
+#include <algorithm>
+
 namespace mapbox {
 namespace geometry {
 namespace wagyu {
 
 template <typename T>
-using scanbeam_list = std::priority_queue<T>;
+using scanbeam_list = std::vector<T>;
 
 template <typename T>
 bool pop_from_scanbeam(T& Y, scanbeam_list<T>& scanbeam) {
     if (scanbeam.empty()) {
         return false;
     }
-    Y = scanbeam.top();
+    std::sort(scanbeam.begin(), scanbeam.end());
-    scanbeam.pop();
+    scanbeam.erase(std::unique(scanbeam.begin(), scanbeam.end()), scanbeam.end());
-    while (!scanbeam.empty() && Y == scanbeam.top()) {
+    Y = scanbeam.back();
-        scanbeam.pop();
+    scanbeam.pop_back();
-    } // Pop duplicates.
     return true;
 }
 
@@ -29,7 +28,7 @@ template <typename T>
 void setup_scanbeam(local_minimum_list<T>& minima_list, scanbeam_list<T>& scanbeam) {
 
     for (auto lm = minima_list.begin(); lm != minima_list.end(); ++lm) {
-        scanbeam.push(lm->y);
+        scanbeam.push_back(lm->y);
     }
 }
 }

mapbox/geometry/wagyu/snap_rounding.hpp

@@ -2,6 +2,7 @@
 
 #include <mapbox/geometry/wagyu/active_bound_list.hpp>
 #include <mapbox/geometry/wagyu/bound.hpp>
+#include <mapbox/geometry/wagyu/bubble_sort.hpp>
 #include <mapbox/geometry/wagyu/config.hpp>
 #include <mapbox/geometry/wagyu/edge.hpp>
 #include <mapbox/geometry/wagyu/intersect.hpp>
@@ -14,94 +15,114 @@ namespace mapbox {
 namespace geometry {
 namespace wagyu {
 
+template <typename T>
+struct hp_intersection_swap {
+
+    ring_manager<T>& manager;
+
+    hp_intersection_swap(ring_manager<T>& m) : manager(m) {
+    }
+
+    void operator()(bound_ptr<T> const& b1, bound_ptr<T> const& b2) {
+        mapbox::geometry::point<double> pt;
+        if (!get_edge_intersection<T, double>(*(b1->current_edge), *(b2->current_edge), pt)) {
+            // LCOV_EXCL_START
+            throw std::runtime_error("Trying to find intersection of lines that do not intersect");
+            // LCOV_EXCL_END
+        }
+        add_to_hot_pixels(round_point<T>(pt), manager);
+    }
+};
+
 template <typename T>
 void process_hot_pixel_intersections(T top_y,
                                      active_bound_list<T>& active_bounds,
-                                     ring_manager<T>& rings) {
+                                     ring_manager<T>& manager) {
     if (active_bounds.empty()) {
         return;
     }
-
     update_current_x(active_bounds, top_y);
-    // bubblesort ...
+    bubble_sort(active_bounds.begin(), active_bounds.end(), intersection_compare<T>(),
-    bool isModified;
+                hp_intersection_swap<T>(manager));
-    do {
-        isModified = false;
-        auto bnd = active_bounds.begin();
-        auto bnd_next = std::next(bnd);
-        while (bnd_next != active_bounds.end()) {
-            if ((*bnd)->current_x > (*bnd_next)->current_x &&
-                !slopes_equal(*(*bnd)->current_edge, *(*bnd_next)->current_edge)) {
-                mapbox::geometry::point<double> pt;
-                if (!get_edge_intersection<T, double>(*((*bnd)->current_edge),
-                                                      *((*bnd_next)->current_edge), pt)) {
-                    // LCOV_EXCL_START
-                    throw std::runtime_error("Edges do not intersect!");
-                    // LCOV_EXCL_END
 }
-                add_to_hot_pixels(round_point<T>(pt), rings);
+
-                swap_positions_in_ABL(bnd, bnd_next, active_bounds);
+template <typename T>
-                bnd_next = std::next(bnd);
+bool horizontals_at_top_scanbeam(T top_y,
-                isModified = true;
+                                 active_bound_list_itr<T>& bnd_curr,
-            } else {
+                                 active_bound_list<T>& active_bounds,
-                bnd = bnd_next;
+                                 ring_manager<T>& manager) {
+    bool shifted = false;
+    auto& current_edge = (*bnd_curr)->current_edge;
+    (*bnd_curr)->current_x = static_cast<double>(current_edge->top.x);
+    if (current_edge->bot.x < current_edge->top.x) {
+        // left to right
+        auto bnd_next = std::next(bnd_curr);
+        while (bnd_next != active_bounds.end() &&
+               (*bnd_next == nullptr || (*bnd_next)->current_x < (*bnd_curr)->current_x)) {
+            if (*bnd_next != nullptr && (*bnd_next)->current_edge->top.y != top_y &&
+                (*bnd_next)->current_edge->bot.y != top_y) {
+                mapbox::geometry::point<T> pt(wround<T>((*bnd_next)->current_x), top_y);
+                add_to_hot_pixels(pt, manager);
+            }
+            std::iter_swap(bnd_curr, bnd_next);
+            ++bnd_curr;
             ++bnd_next;
+            shifted = true;
+        }
+    } else {
+        // right to left
+        if (bnd_curr != active_bounds.begin()) {
+            auto bnd_prev = std::prev(bnd_curr);
+            while (bnd_curr != active_bounds.begin() &&
+                   (*bnd_prev == nullptr || (*bnd_prev)->current_x > (*bnd_curr)->current_x)) {
+                if (*bnd_prev != nullptr && (*bnd_prev)->current_edge->top.y != top_y &&
+                    (*bnd_prev)->current_edge->bot.y != top_y) {
+                    mapbox::geometry::point<T> pt(wround<T>((*bnd_prev)->current_x), top_y);
+                    add_to_hot_pixels(pt, manager);
+                }
+                std::iter_swap(bnd_curr, bnd_prev);
+                --bnd_curr;
+                if (bnd_curr != active_bounds.begin()) {
+                    --bnd_prev;
                 }
             }
-    } while (isModified);
+        }
+    }
+    return shifted;
 }
 
 template <typename T>
 void process_hot_pixel_edges_at_top_of_scanbeam(T top_y,
                                                 scanbeam_list<T>& scanbeam,
                                                 active_bound_list<T>& active_bounds,
-                                                ring_manager<T>& rings) {
+                                                ring_manager<T>& manager) {
     for (auto bnd = active_bounds.begin(); bnd != active_bounds.end();) {
-        auto bnd_2 = std::next(bnd);
+        if (*bnd == nullptr) {
-        while ((*bnd)->current_edge != (*bnd)->edges.end() &&
+            ++bnd;
-               (*bnd)->current_edge->top.y == top_y) {
+            continue;
-            add_to_hot_pixels((*bnd)->current_edge->top, rings);
-            if (current_edge_is_horizontal<T>(bnd)) {
-                (*bnd)->current_x = static_cast<double>((*bnd)->current_edge->top.x);
-                if ((*bnd)->current_edge->bot.x < (*bnd)->current_edge->top.x) {
-                    // left to right
-                    auto bnd_next = std::next(bnd);
-                    while (bnd_next != active_bounds.end() &&
-                           (*bnd_next)->current_x < (*bnd)->current_x) {
-                        if (std::llround((*bnd_next)->current_edge->top.y) != top_y &&
-                            std::llround((*bnd_next)->current_edge->bot.y) != top_y) {
-                            mapbox::geometry::point<T> pt(std::llround((*bnd_next)->current_x),
-                                                          top_y);
-                            add_to_hot_pixels(pt, rings);
         }
-                        swap_positions_in_ABL(bnd, bnd_next, active_bounds);
+        bound<T>& current_bound = *(*bnd);
-                        bnd_next = std::next(bnd);
+        auto bnd_curr = bnd;
-                    }
+        bool shifted = false;
-                } else {
+        auto& current_edge = current_bound.current_edge;
-                    // right to left
+        while (current_edge != current_bound.edges.end() && current_edge->top.y == top_y) {
-                    if (bnd != active_bounds.begin()) {
+            add_to_hot_pixels(current_edge->top, manager);
-                        auto bnd_prev = std::prev(bnd);
+            if (is_horizontal(*current_edge)) {
-                        while (bnd != active_bounds.begin() &&
+                if (horizontals_at_top_scanbeam(top_y, bnd_curr, active_bounds, manager)) {
-                               (*bnd_prev)->current_x > (*bnd)->current_x) {
+                    shifted = true;
-                            if (std::llround((*bnd_prev)->current_edge->top.y) != top_y &&
-                                std::llround((*bnd_prev)->current_edge->bot.y) != top_y) {
-                                mapbox::geometry::point<T> pt(std::llround((*bnd_prev)->current_x),
-                                                              top_y);
-                                add_to_hot_pixels(pt, rings);
-                            }
-                            swap_positions_in_ABL(bnd, bnd_prev, active_bounds);
-                            bnd_prev = std::prev(bnd);
                 }
             }
+            next_edge_in_bound(current_bound, scanbeam);
+        }
+        if (current_edge == current_bound.edges.end()) {
+            *bnd_curr = nullptr;
+        }
+        if (!shifted) {
+            ++bnd;
         }
     }
-            next_edge_in_bound(bnd, scanbeam);
+    active_bounds.erase(std::remove(active_bounds.begin(), active_bounds.end(), nullptr),
-        }
+                        active_bounds.end());
-        if ((*bnd)->current_edge == (*bnd)->edges.end()) {
-            active_bounds.erase(bnd);
-        }
-        bnd = bnd_2;
-    }
 }
 
 template <typename T>
@@ -109,30 +130,32 @@ void insert_local_minima_into_ABL_hot_pixel(T top_y,
                                             local_minimum_ptr_list<T>& minima_sorted,
                                             local_minimum_ptr_list_itr<T>& lm,
                                             active_bound_list<T>& active_bounds,
-                                            ring_manager<T>& rings,
+                                            ring_manager<T>& manager,
                                             scanbeam_list<T>& scanbeam) {
     while (lm != minima_sorted.end() && (*lm)->y == top_y) {
-        add_to_hot_pixels((*lm)->left_bound.edges.front().bot, rings);
+        add_to_hot_pixels((*lm)->left_bound.edges.front().bot, manager);
         auto& left_bound = (*lm)->left_bound;
-        left_bound.current_edge = left_bound.edges.begin();
-        left_bound.current_x = static_cast<double>(left_bound.current_edge->bot.x);
-        auto lb_abl_itr = insert_bound_into_ABL(left_bound, active_bounds);
-        if (!current_edge_is_horizontal<T>(lb_abl_itr)) {
-            scanbeam.push((*lb_abl_itr)->current_edge->top.y);
-        }
         auto& right_bound = (*lm)->right_bound;
+        left_bound.current_edge = left_bound.edges.begin();
+        left_bound.next_edge = std::next(left_bound.current_edge);
+        left_bound.current_x = static_cast<double>(left_bound.current_edge->bot.x);
         right_bound.current_edge = right_bound.edges.begin();
+        right_bound.next_edge = std::next(right_bound.current_edge);
         right_bound.current_x = static_cast<double>(right_bound.current_edge->bot.x);
-        auto rb_abl_itr = insert_bound_into_ABL(right_bound, lb_abl_itr, active_bounds);
+        auto lb_abl_itr = insert_bound_into_ABL(left_bound, right_bound, active_bounds);
+        if (!current_edge_is_horizontal<T>(lb_abl_itr)) {
+            scanbeam.push_back((*lb_abl_itr)->current_edge->top.y);
+        }
+        auto rb_abl_itr = std::next(lb_abl_itr);
         if (!current_edge_is_horizontal<T>(rb_abl_itr)) {
-            scanbeam.push((*rb_abl_itr)->current_edge->top.y);
+            scanbeam.push_back((*rb_abl_itr)->current_edge->top.y);
         }
         ++lm;
     }
 }
 
 template <typename T>
-void build_hot_pixels(local_minimum_list<T>& minima_list, ring_manager<T>& rings) {
+void build_hot_pixels(local_minimum_list<T>& minima_list, ring_manager<T>& manager) {
     active_bound_list<T> active_bounds;
     scanbeam_list<T> scanbeam;
     T scanline_y = std::numeric_limits<T>::max();
@@ -153,19 +176,19 @@ void build_hot_pixels(local_minimum_list<T>& minima_list, ring_manager<T>& rings
         reserve += lm.left_bound.edges.size() + 2;
         reserve += lm.right_bound.edges.size() + 2;
     }
-    rings.hot_pixels.reserve(reserve);
+    manager.hot_pixels.reserve(reserve);
 
     while (pop_from_scanbeam(scanline_y, scanbeam) || current_lm != minima_sorted.end()) {
 
-        process_hot_pixel_intersections(scanline_y, active_bounds, rings);
+        process_hot_pixel_intersections(scanline_y, active_bounds, manager);
 
         insert_local_minima_into_ABL_hot_pixel(scanline_y, minima_sorted, current_lm, active_bounds,
-                                               rings, scanbeam);
+                                               manager, scanbeam);
 
-        process_hot_pixel_edges_at_top_of_scanbeam(scanline_y, scanbeam, active_bounds, rings);
+        process_hot_pixel_edges_at_top_of_scanbeam(scanline_y, scanbeam, active_bounds, manager);
     }
-    preallocate_point_memory(rings, rings.hot_pixels.size());
+    preallocate_point_memory(manager, manager.hot_pixels.size());
-    sort_hot_pixels(rings);
+    sort_hot_pixels(manager);
 }
 }
 }

mapbox/geometry/wagyu/util.hpp

@@ -31,17 +31,13 @@ double area(mapbox::geometry::linear_ring<T> const& poly) {
 }
 
 inline bool value_is_zero(double val) {
-    return std::fabs(val) < std::numeric_limits<double>::epsilon();
+    return std::fabs(val) < (5.0 * std::numeric_limits<double>::epsilon());
 }
 
 inline bool values_are_equal(double x, double y) {
     return value_is_zero(x - y);
 }
 
-inline bool values_near_equal(double x, double y) {
-    return std::fabs(x - y) < (5.0 * std::numeric_limits<double>::epsilon());
-}
-
 inline bool greater_than_or_equal(double x, double y) {
     return x > y || values_are_equal(x, y);
 }
@@ -74,6 +70,16 @@ bool slopes_equal(mapbox::geometry::point<T> const& pt1,
                   mapbox::geometry::point<T> const& pt4) {
     return (pt1.y - pt2.y) * (pt3.x - pt4.x) == (pt1.x - pt2.x) * (pt3.y - pt4.y);
 }
+
+template <typename T>
+inline T wround(double value) {
+    return static_cast<T>(::llround(value));
+}
+
+template <>
+inline std::int64_t wround<std::int64_t>(double value) {
+    return ::llround(value);
+}
 }
 }
 }

mapbox/geometry/wagyu/vatti.hpp

@@ -19,16 +19,11 @@ namespace geometry {
 namespace wagyu {
 
 template <typename T>
-bool execute_vatti(local_minimum_list<T>& minima_list,
+void execute_vatti(local_minimum_list<T>& minima_list,
-                   ring_manager<T>& rings,
+                   ring_manager<T>& manager,
                    clip_type cliptype,
                    fill_type subject_fill_type,
                    fill_type clip_fill_type) {
-
-    if (minima_list.empty()) {
-        return false;
-    }
-
     active_bound_list<T> active_bounds;
     scanbeam_list<T> scanbeam;
     T scanline_y = std::numeric_limits<T>::max();
@@ -43,31 +38,28 @@ bool execute_vatti(local_minimum_list<T>& minima_list,
     // std::clog << output_all_edges(minima_sorted) << std::endl;
 
     setup_scanbeam(minima_list, scanbeam);
-    rings.current_hp_itr = rings.hot_pixels.begin();
+    manager.current_hp_itr = manager.hot_pixels.begin();
 
     while (pop_from_scanbeam(scanline_y, scanbeam) || current_lm != minima_sorted.end()) {
 
         process_intersections(scanline_y, active_bounds, cliptype, subject_fill_type,
-                              clip_fill_type, rings);
+                              clip_fill_type, manager);
 
-        update_current_hp_itr(scanline_y, rings);
+        update_current_hp_itr(scanline_y, manager);
 
         // First we process bounds that has already been added to the active bound list --
         // if the active bound list is empty local minima that are at this scanline_y and
         // have a horizontal edge at the local minima will be processed
         process_edges_at_top_of_scanbeam(scanline_y, active_bounds, scanbeam, minima_sorted,
-                                         current_lm, rings, cliptype, subject_fill_type,
+                                         current_lm, manager, cliptype, subject_fill_type,
                                          clip_fill_type);
 
         // Next we will add local minima bounds to the active bounds list that are on the local
         // minima queue at
         // this current scanline_y
-        insert_local_minima_into_ABL(scanline_y, minima_sorted, current_lm, active_bounds, rings,
+        insert_local_minima_into_ABL(scanline_y, minima_sorted, current_lm, active_bounds, manager,
                                      scanbeam, cliptype, subject_fill_type, clip_fill_type);
     }
-    // std::clog << rings.rings << std::endl;
-    // std::clog << output_as_polygon(rings.all_rings[0]);
-    return true;
 }
 }
 }

mapbox/geometry/wagyu/wagyu.hpp

@@ -16,10 +16,11 @@
 #include <mapbox/geometry/wagyu/vatti.hpp>
 
 #define WAGYU_MAJOR_VERSION 0
-#define WAGYU_MINOR_VERSION 3
+#define WAGYU_MINOR_VERSION 4
-#define WAGYU_PATCH_VERSION 0
+#define WAGYU_PATCH_VERSION 3
 
-#define WAGYU_VERSION (WAGYU_MAJOR_VERSION * 100000) + (WAGYU_MINOR_VERSION * 100) + (WAGYU_PATCH_VERSION)
+#define WAGYU_VERSION                                                                              \
+    (WAGYU_MAJOR_VERSION * 100000) + (WAGYU_MINOR_VERSION * 100) + (WAGYU_PATCH_VERSION)
 
 namespace mapbox {
 namespace geometry {
@@ -28,9 +29,7 @@ namespace wagyu {
 template <typename T>
 class wagyu {
 private:
-    using value_type = T;
+    local_minimum_list<T> minima_list;
-
-    local_minimum_list<value_type> minima_list;
     bool reverse_output;
 
     wagyu(wagyu const&) = delete;
@@ -44,12 +43,14 @@ public:
         clear();
     }
 
-    bool add_ring(mapbox::geometry::linear_ring<value_type> const& pg,
+    template <typename T2>
+    bool add_ring(mapbox::geometry::linear_ring<T2> const& pg,
                   polygon_type p_type = polygon_type_subject) {
         return add_linear_ring(pg, minima_list, p_type);
     }
 
-    bool add_polygon(mapbox::geometry::polygon<value_type> const& ppg,
+    template <typename T2>
+    bool add_polygon(mapbox::geometry::polygon<T2> const& ppg,
                      polygon_type p_type = polygon_type_subject) {
         bool result = false;
         for (auto const& r : ppg) {
@@ -68,11 +69,11 @@ public:
         minima_list.clear();
     }
 
-    mapbox::geometry::box<value_type> get_bounds() {
+    mapbox::geometry::box<T> get_bounds() {
-        mapbox::geometry::point<value_type> min = { 0, 0 };
+        mapbox::geometry::point<T> min = { 0, 0 };
-        mapbox::geometry::point<value_type> max = { 0, 0 };
+        mapbox::geometry::point<T> max = { 0, 0 };
         if (minima_list.empty()) {
-            return mapbox::geometry::box<value_type>(min, max);
+            return mapbox::geometry::box<T>(min, max);
         }
         bool first_set = false;
         for (auto const& lm : minima_list) {
@@ -109,25 +110,28 @@ public:
                 }
             }
         }
-        return mapbox::geometry::box<value_type>(min, max);
+        return mapbox::geometry::box<T>(min, max);
     }
 
+    template <typename T2>
     bool execute(clip_type cliptype,
-                 mapbox::geometry::multi_polygon<value_type>& solution,
+                 mapbox::geometry::multi_polygon<T2>& solution,
                  fill_type subject_fill_type,
                  fill_type clip_fill_type) {
 
-        ring_manager<T> rings;
+        if (minima_list.empty()) {
-
-        build_hot_pixels(minima_list, rings);
-
-        if (!execute_vatti(minima_list, rings, cliptype, subject_fill_type, clip_fill_type)) {
             return false;
         }
 
-        do_simple_polygons(rings);
+        ring_manager<T> manager;
 
-        build_result(solution, rings, reverse_output);
+        build_hot_pixels(minima_list, manager);
+
+        execute_vatti(minima_list, manager, cliptype, subject_fill_type, clip_fill_type);
+
+        correct_topology(manager);
+
+        build_result(solution, manager, reverse_output);
 
         return true;
     }

tests/dateline/out/-z5.json

@@ -12,7 +12,7 @@
 }, "features": [
 { "type": "FeatureCollection", "properties": { "zoom": 0, "x": 0, "y": 0 }, "features": [
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tests/islands/out/-d7_-z7_-pt_-pp.json

@@ -54,7 +54,7 @@
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@@ -206,7 +206,7 @@
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tests/join-population/joined-i.mbtiles.json

@@ -148,7 +148,7 @@
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@@ -406,7 +406,7 @@
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@@ -1280,7 +1280,7 @@
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@@ -1322,7 +1322,7 @@
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tests/join-population/joined-no-tile-stats.mbtiles.json

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@@ -1916,7 +1916,7 @@
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@@ -1966,7 +1966,7 @@
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tests/join-population/joined-null.mbtiles.json

@@ -72,7 +72,7 @@
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@@ -1916,7 +1916,7 @@
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@@ -1966,7 +1966,7 @@
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tests/join-population/joined.mbtiles.json

@@ -72,7 +72,7 @@
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@@ -1916,7 +1916,7 @@
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@@ -1966,7 +1966,7 @@
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tests/join-population/merged-folder.mbtiles.json

@@ -124,7 +124,7 @@
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tests/join-population/merged.mbtiles.json

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tests/join-population/no-macarthur.mbtiles.json

@@ -78,7 +78,7 @@
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tests/join-population/raw-merged-folder.json

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