Update to new Wagyu output

This reverts commit 029f336589.

Makefile

@@ -7,7 +7,7 @@ SHELL = /bin/bash
 CC := $(CC)
 CXX := $(CXX)
 CFLAGS := $(CFLAGS)
-CXXFLAGS := $(CXXFLAGS) -std=c++11
+CXXFLAGS := $(CXXFLAGS) -std=c++14
 LDFLAGS := $(LDFLAGS)
 WARNING_FLAGS := -Wall -Wshadow -Wsign-compare
 RELEASE_FLAGS := -O3 -DNDEBUG
@@ -40,7 +40,7 @@ PG=
 H = $(wildcard *.h) $(wildcard *.hpp)
 C = $(wildcard *.c) $(wildcard *.cpp)
 
-INCLUDES = -I/usr/local/include -I.
+INCLUDES = -I/usr/local/include -I. -I../geometry.hpp/include -I../variant/include -I../wagyu/include
 LIBS = -L/usr/local/lib
 
 tippecanoe: geojson.o jsonpull/jsonpull.o tile.o pool.o mbtiles.o geometry.o projection.o memfile.o clipper/clipper.o mvt.o serial.o main.o text.o

decode.cpp

@@ -46,6 +46,71 @@ struct lonlat {
 	}
 };
 
+struct print_visitor {
+	const char *key;
+
+	print_visitor(const char *k) {
+		key = k;
+	}
+
+	void operator()(std::string const &val) const {
+		printq(key);
+		printf(": ");
+		printq(val.c_str());
+	}
+
+	void operator()(int64_t val) const {
+		printq(key);
+		printf(": %lld", (long long) val);
+	}
+
+	void operator()(double val) const {
+		printq(key);
+		double v = val;
+		if (v == (long long) v) {
+			printf(": %lld", (long long) v);
+		} else {
+			printf(": %g", v);
+		}
+	}
+
+	void operator()(float val) const {
+		printq(key);
+		double v = val;
+		if (v == (long long) v) {
+			printf(": %lld", (long long) v);
+		} else {
+			printf(": %g", v);
+		}
+	}
+
+	void operator()(uint64_t val) const {
+		printq(key);
+		printf(": %llu", (unsigned long long) val);
+	}
+
+	void operator()(bool val) const {
+		printq(key);
+		printf(": %s", val ? "true" : "false");
+	}
+
+	void operator()(std::nullptr_t val) const {
+		printq(key);
+		printf(": null");
+	}
+
+	void operator()(mapbox::geometry::null_value_t val) const {
+		printq(key);
+		printf(": null");
+	}
+
+	void operator()(std::vector<mvt_value> const &val) const {
+	}
+
+	void operator()(std::unordered_map<std::string, mvt_value> const &val) const {
+	}
+};
+
 void handle(std::string message, int z, unsigned x, unsigned y, int describe) {
 	int within = 0;
 	mvt_tile tile;
@@ -125,40 +190,7 @@ void handle(std::string message, int z, unsigned x, unsigned y, int describe) {
 
 				const char *key = layer.keys[feat.tags[t]].c_str();
 				mvt_value const &val = layer.values[feat.tags[t + 1]];
-
-				if (val.type == mvt_string) {
-					printq(key);
-					printf(": ");
-					printq(val.string_value.c_str());
-				} else if (val.type == mvt_int) {
-					printq(key);
-					printf(": %lld", (long long) val.numeric_value.int_value);
-				} else if (val.type == mvt_double) {
-					printq(key);
-					double v = val.numeric_value.double_value;
-					if (v == (long long) v) {
-						printf(": %lld", (long long) v);
-					} else {
-						printf(": %g", v);
-					}
-				} else if (val.type == mvt_float) {
-					printq(key);
-					double v = val.numeric_value.float_value;
-					if (v == (long long) v) {
-						printf(": %lld", (long long) v);
-					} else {
-						printf(": %g", v);
-					}
-				} else if (val.type == mvt_sint) {
-					printq(key);
-					printf(": %lld", (long long) val.numeric_value.sint_value);
-				} else if (val.type == mvt_uint) {
-					printq(key);
-					printf(": %lld", (long long) val.numeric_value.uint_value);
-				} else if (val.type == mvt_bool) {
-					printq(key);
-					printf(": %s", val.numeric_value.bool_value ? "true" : "false");
-				}
+				mapbox::util::apply_visitor(print_visitor(key), val);
 			}
 
 			printf(" }, \"geometry\": { ");
@@ -178,9 +210,9 @@ void handle(std::string message, int z, unsigned x, unsigned y, int describe) {
 					double lat, lon;
 					projection->unproject(wx, wy, 32, &lon, &lat);
 
-					ops.push_back(lonlat(op, lon, lat, px, py));
+					ops.emplace_back(op, lon, lat, px, py);
 				} else {
-					ops.push_back(lonlat(op, 0, 0, 0, 0));
+					ops.emplace_back(op, 0, 0, 0, 0);
 				}
 			}
 
@@ -239,8 +271,8 @@ void handle(std::string message, int z, unsigned x, unsigned y, int describe) {
 
 				for (size_t i = 0; i < ops.size(); i++) {
 					if (ops[i].op == VT_MOVETO) {
-						rings.push_back(std::vector<lonlat>());
-						areas.push_back(0);
+						rings.emplace_back();
+						areas.emplace_back(0);
 					}
 
 					int n = rings.size() - 1;

geometry.cpp

@@ -9,11 +9,201 @@
 #include <cmath>
 #include <limits.h>
 #include <sqlite3.h>
+#include <sstream>
 #include "geometry.hpp"
 #include "clipper/clipper.hpp"
 #include "projection.hpp"
 #include "serial.hpp"
 #include "main.hpp"
+#include <mapbox/geometry/polygon.hpp>
+#include <mapbox/geometry/wagyu/wagyu.hpp>
+
+struct convert_visitor {
+	drawvec *dv;
+	int *type;
+
+	convert_visitor(drawvec *ndv, int *ntype) {
+		dv = ndv;
+		type = ntype;
+	}
+
+	void operator()(mapbox::geometry::point<long long> const &val) const {
+		*type = VT_POINT;
+		dv->push_back(draw(VT_MOVETO, val.x, val.y));
+	}
+
+	void operator()(mapbox::geometry::multi_point<long long> const &val) const {
+		*type = VT_POINT;
+		for (size_t i = 0; i < val.size(); i++) {
+			dv->push_back(draw(VT_MOVETO, val[i].x, val[i].y));
+		}
+	}
+
+	void operator()(mapbox::geometry::line_string<long long> const &val) const {
+		*type = VT_LINE;
+		for (size_t i = 0; i < val.size(); i++) {
+			if (i == 0) {
+				dv->push_back(draw(VT_MOVETO, val[i].x, val[i].y));
+			} else {
+				dv->push_back(draw(VT_LINETO, val[i].x, val[i].y));
+			}
+		}
+	}
+
+	void operator()(mapbox::geometry::multi_line_string<long long> const &val) const {
+		*type = VT_LINE;
+		for (size_t i = 0; i < val.size(); i++) {
+			for (size_t j = 0; j < val[i].size(); j++) {
+				if (j == 0) {
+					dv->push_back(draw(VT_MOVETO, val[i][j].x, val[i][j].y));
+				} else {
+					dv->push_back(draw(VT_LINETO, val[i][j].x, val[i][j].y));
+				}
+			}
+		}
+	}
+
+	void operator()(mapbox::geometry::polygon<long long> const &val) const {
+		*type = VT_POLYGON;
+		for (size_t i = 0; i < val.size(); i++) {
+			for (size_t j = 0; j < val[i].size(); j++) {
+				if (j == 0) {
+					dv->push_back(draw(VT_MOVETO, val[i][j].x, val[i][j].y));
+				} else {
+					dv->push_back(draw(VT_LINETO, val[i][j].x, val[i][j].y));
+				}
+			}
+		}
+	}
+
+	void operator()(mapbox::geometry::multi_polygon<long long> const &val) const {
+		*type = VT_POLYGON;
+		for (size_t i = 0; i < val.size(); i++) {
+			for (size_t j = 0; j < val[i].size(); j++) {
+				for (size_t k = 0; k < val[i][j].size(); k++) {
+					if (k == 0) {
+						dv->push_back(draw(VT_MOVETO, val[i][j][k].x, val[i][j][k].y));
+					} else {
+						dv->push_back(draw(VT_LINETO, val[i][j][k].x, val[i][j][k].y));
+					}
+				}
+			}
+		}
+	}
+
+	void operator()(mapbox::geometry::geometry_collection<long long> const &val) const {
+		fprintf(stderr, "Geometry collections not supported\n");
+		exit(EXIT_FAILURE);
+	}
+};
+
+drawvec to_drawvec(mapbox::geometry::geometry<long long> const &g, int &type) {
+	drawvec dv;
+	mapbox::util::apply_visitor(convert_visitor(&dv, &type), g);
+
+	return dv;
+}
+
+mapbox::geometry::geometry<long long> from_drawvec(int type, drawvec const &dv) {
+	if (type == VT_POINT) {
+		if (dv.size() == 1) {
+			return mapbox::geometry::point<long long>(dv[0].x, dv[0].y);
+		} else {
+			mapbox::geometry::multi_point<long long> mp;
+			for (size_t i = 0; i < dv.size(); i++) {
+				mp.emplace_back((long long) dv[i].x, (long long) dv[i].y);
+			}
+			return mp;
+		}
+	} else if (type == VT_LINE) {
+		int movetos = 0;
+		for (size_t i = 0; i < dv.size(); i++) {
+			if (dv[i].op == VT_MOVETO) {
+				movetos++;
+			}
+		}
+		if (movetos == 1) {
+			mapbox::geometry::line_string<long long> ls;
+			for (size_t i = 0; i < dv.size(); i++) {
+				ls.emplace_back((long long) dv[i].x, (long long) dv[i].y);
+			}
+			return ls;
+		} else {
+			mapbox::geometry::multi_line_string<long long> mls;
+			for (size_t i = 0; i < dv.size(); i++) {
+				if (dv[i].op == VT_MOVETO) {
+					size_t j;
+					for (j = i + 1; j < dv.size(); j++) {
+						if (dv[j].op != VT_LINETO) {
+							break;
+						}
+					}
+					mapbox::geometry::line_string<long long> ls;
+					for (size_t k = i; k < j; k++) {
+						ls.emplace_back((long long) dv[k].x, (long long) dv[k].y);
+					}
+					mls.push_back(ls);
+					i = j - 1;
+				}
+			}
+			return mls;
+		}
+	} else if (type == VT_POLYGON) {
+		std::vector<drawvec> rings;
+		for (size_t i = 0; i < dv.size(); i++) {
+			if (dv[i].op == VT_MOVETO) {
+				size_t j;
+				for (j = i + 1; j < dv.size(); j++) {
+					if (dv[j].op != VT_LINETO) {
+						break;
+					}
+				}
+				drawvec ring;
+				for (size_t k = i; k < j; k++) {
+					ring.push_back(dv[k]);
+				}
+				rings.push_back(ring);
+				i = j - 1;
+			}
+		}
+		std::vector<long double> areas;
+		int outers = 0;
+		for (size_t i = 0; i < rings.size(); i++) {
+			long long area = get_area(rings[i], 0, rings[i].size());
+			if (area >= 0 || i == 0) {
+				outers++;
+			}
+			areas.push_back(area);
+		}
+		if (outers == 1) {
+			mapbox::geometry::polygon<long long> p;
+			for (size_t i = 0; i < rings.size(); i++) {
+				mapbox::geometry::linear_ring<long long> lr;
+				for (size_t j = 0; j < rings[i].size(); j++) {
+					lr.emplace_back((long long) rings[i][j].x, (long long) rings[i][j].y);
+				}
+				p.push_back(lr);
+			}
+			return p;
+		} else {
+			mapbox::geometry::multi_polygon<long long> mp;
+			for (size_t i = 0; i < rings.size(); i++) {
+				if (areas[i] >= 0 || i == 0) {
+					mp.emplace_back();
+				}
+				mapbox::geometry::linear_ring<long long> lr;
+				for (size_t j = 0; j < rings[i].size(); j++) {
+					lr.emplace_back((long long) rings[i][j].x, (long long) rings[i][j].y);
+				}
+				mp[mp.size() - 1].push_back(lr);
+			}
+			return mp;
+		}
+	} else {
+		fprintf(stderr, "Bogus geometry type %d\n", type);
+		exit(EXIT_FAILURE);
+	}
+}
 
 static int pnpoly(drawvec &vert, size_t start, size_t nvert, long long testx, long long testy);
 static int clip(double *x0, double *y0, double *x1, double *y1, double xmin, double ymin, double xmax, double ymax);
@@ -234,142 +424,35 @@ void reverse_ring(drawvec &geom, size_t start, size_t end) {
 	}
 }
 
-struct ring {
-	drawvec data;
-	long double area;
-	long long parent;
-	std::vector<size_t> children;
+static void decode_clipped(mapbox::geometry::multi_polygon<long long> &t, drawvec &out) {
+	out.clear();
 
-	ring(drawvec &_data) {
-		data = _data;
-		area = get_area(_data, 0, _data.size());
-		parent = -1;
-	}
+	for (size_t i = 0; i < t.size(); i++) {
+		for (size_t j = 0; j < t[i].size(); j++) {
+			drawvec ring;
 
-	bool operator<(const ring &o) const {
-		if (std::fabs(this->area) < std::fabs(o.area)) {
-			return true;
-		} else {
-			return false;
-		}
-	}
-};
-
-static void decode_rings(ClipperLib::PolyNode *t, std::vector<ring> &out) {
-	// Supposedly outer ring
-
-	ClipperLib::Path p = t->Contour;
-	drawvec dv;
-	for (size_t i = 0; i < p.size(); i++) {
-		dv.push_back(draw((i == 0) ? VT_MOVETO : VT_LINETO, p[i].X, p[i].Y));
-	}
-	if (p.size() > 0) {
-		dv.push_back(draw(VT_LINETO, p[0].X, p[0].Y));
-	}
-	out.push_back(dv);
-
-	// Supposedly inner rings
-
-	for (int n = 0; n < t->ChildCount(); n++) {
-		ClipperLib::Path cp = t->Childs[n]->Contour;
-		drawvec ring;
-		for (size_t i = 0; i < cp.size(); i++) {
-			ring.push_back(draw((i == 0) ? VT_MOVETO : VT_LINETO, cp[i].X, cp[i].Y));
-		}
-		if (cp.size() > 0) {
-			ring.push_back(draw(VT_LINETO, cp[0].X, cp[0].Y));
-		}
-		out.push_back(ring);
-	}
-
-	// Recurse to supposedly outer rings (children of the children)
-
-	for (int n = 0; n < t->ChildCount(); n++) {
-		for (int m = 0; m < t->Childs[n]->ChildCount(); m++) {
-			decode_rings(t->Childs[n]->Childs[m], out);
-		}
-	}
-}
-
-static void decode_clipped(ClipperLib::PolyNode *t, drawvec &out) {
-	// The output of Clipper supposedly produces the outer rings
-	// as top level objects, with links to any inner-ring children
-	// they may have, each of which then has links to any outer rings
-	// that it has, and so on. This doesn't actually work.
-
-	// So instead, we pull out all the rings, sort them by absolute area,
-	// and go through them, looking for the
-	// smallest parent that contains a point from it, since we are
-	// guaranteed that at least one point in the polygon is strictly
-	// inside its parent (not on one of its boundary lines).
-
-	std::vector<ring> rings;
-	decode_rings(t, rings);
-	std::sort(rings.begin(), rings.end());
-
-	for (size_t i = 0; i < rings.size(); i++) {
-		for (size_t j = i + 1; j < rings.size(); j++) {
-			for (size_t k = 0; k < rings[i].data.size(); k++) {
-				if (pnpoly(rings[j].data, 0, rings[j].data.size(), rings[i].data[k].x, rings[i].data[k].y)) {
-					rings[i].parent = j;
-					rings[j].children.push_back(i);
-					goto nextring;
-				}
-			}
-		}
-	nextring:;
-	}
-
-	// Then reverse the winding order of any rings that turned out
-	// to actually be inner when they are outer, or vice versa.
-	// (A ring is outer if it has no parent or if its parent is
-	// an inner ring.)
-
-	for (size_t ii = rings.size(); ii > 0; ii--) {
-		size_t i = ii - 1;
-
-		if (rings[i].parent < 0) {
-			if (rings[i].area < 0) {
-				rings[i].area = -rings[i].area;
-				reverse_ring(rings[i].data, 0, rings[i].data.size());
-			}
-		} else {
-			if ((rings[i].area > 0) == (rings[rings[i].parent].area > 0)) {
-				rings[i].area = -rings[i].area;
-				reverse_ring(rings[i].data, 0, rings[i].data.size());
-			}
-		}
-	}
-
-	// Then run through the rings again, outputting each outer ring
-	// followed by its direct children, and checking to make sure
-	// there are no child rings whose parents weren't identified.
-
-	for (size_t ii = rings.size(); ii > 0; ii--) {
-		size_t i = ii - 1;
-
-		if (rings[i].area > 0) {
-#if 0
-			fprintf(stderr, "ring area %Lf at %lld\n", rings[i].area, (long long) out.size());
-#endif
-
-			for (size_t j = 0; j < rings[i].data.size(); j++) {
-				out.push_back(rings[i].data[j]);
+			// The coordinate system is swapped, so wagyu ring winding is
+			// backwards from internal ring winding.
+			ssize_t start = t[i][j].size() - 1;
+			for (ssize_t k = start; k >= 0; --k) {
+				ring.push_back(draw((k == start) ? VT_MOVETO : VT_LINETO, t[i][j][k].x, t[i][j][k].y));
 			}
 
-			for (size_t j = 0; j < rings[i].children.size(); j++) {
-#if 0
-				fprintf(stderr, "ring area %Lf at %lld\n", rings[rings[i].children[j]].area, (long long) out.size());
-#endif
-
-				for (size_t k = 0; k < rings[rings[i].children[j]].data.size(); k++) {
-					out.push_back(rings[rings[i].children[j]].data[k]);
-				}
-
-				rings[rings[i].children[j]].parent = -2;
+			if (ring.size() > 0 && ring[ring.size() - 1] != ring[0]) {
+				fprintf(stderr, "Had to close ring\n");
+				ring.push_back(draw(VT_LINETO, ring[0].x, ring[0].y));
+			}
+
+			double area = get_area(ring, 0, ring.size());
+
+			if ((j == 0 && area < 0) || (j != 0 && area > 0)) {
+				fprintf(stderr, "Ring area has wrong sign: %f for %zu\n", area, j);
+				exit(EXIT_FAILURE);
+			}
+
+			for (size_t k = 0; k < ring.size(); k++) {
+				out.push_back(ring[k]);
 			}
-		} else if (rings[i].parent != -2) {
-			fprintf(stderr, "Found ring with child area but no parent %lld\n", (long long) i);
 		}
 	}
 }
@@ -409,9 +492,10 @@ static void dump(drawvec &geom) {
 }
 
 drawvec clean_or_clip_poly(drawvec &geom, int z, int detail, int buffer, bool clip) {
-	ClipperLib::Clipper clipper(ClipperLib::ioStrictlySimple);
+	mapbox::geometry::geometry<long long> g = from_drawvec(VT_POLYGON, geom);
+	mapbox::geometry::wagyu::wagyu<long long> wagyu;
 
-	bool has_area = false;
+	printf("[");
 
 	for (size_t i = 0; i < geom.size(); i++) {
 		if (geom[i].op == VT_MOVETO) {
@@ -422,77 +506,73 @@ drawvec clean_or_clip_poly(drawvec &geom, int z, int detail, int buffer, bool cl
 				}
 			}
 
-			double area = get_area(geom, i, j);
-			if (area != 0) {
-				has_area = true;
-			}
+			if (j >= i + 4) {
+				mapbox::geometry::linear_ring<long long> lr;
 
-			ClipperLib::Path path;
-
-			drawvec tmp;
-			for (size_t k = i; k < j; k++) {
-				path.push_back(ClipperLib::IntPoint(geom[k].x, geom[k].y));
-			}
-
-			if (!clipper.AddPath(path, ClipperLib::ptSubject, true)) {
-#if 0
-				fprintf(stderr, "Couldn't add polygon for clipping:");
-				for (size_t k = i; k < j; k++) {
-					fprintf(stderr, " %lld,%lld", geom[k].x, geom[k].y);
+				if (i != 0) {
+					printf(",");
+				}
+				printf("[");
+
+				for (size_t k = i; k < j; k++) {
+					lr.push_back(mapbox::geometry::point<long long>(geom[k].x, geom[k].y));
+					if (k != i) {
+						printf(",");
+					}
+					printf("[%lld,%lld]", geom[k].x, geom[k].y);
+				}
+
+				printf("]");
+
+				if (lr.size() >= 3) {
 				}
-				fprintf(stderr, "\n");
-#endif
 			}
 
 			i = j - 1;
-		} else {
-			fprintf(stderr, "Unexpected operation in polygon %d\n", (int) geom[i].op);
-			exit(EXIT_FAILURE);
 		}
 	}
 
-	if (clip) {
-		long long area = 1LL << (32 - z);
-		long long clip_buffer = buffer * area / 256;
+	printf("]");
+	printf("\n\n\n\n\n");
+	fflush(stdout);
 
-		ClipperLib::Path edge;
-		edge.push_back(ClipperLib::IntPoint(-clip_buffer, -clip_buffer));
-		edge.push_back(ClipperLib::IntPoint(area + clip_buffer, -clip_buffer));
-		edge.push_back(ClipperLib::IntPoint(area + clip_buffer, area + clip_buffer));
-		edge.push_back(ClipperLib::IntPoint(-clip_buffer, area + clip_buffer));
-		edge.push_back(ClipperLib::IntPoint(-clip_buffer, -clip_buffer));
-
-		clipper.AddPath(edge, ClipperLib::ptClip, true);
-	}
-
-	ClipperLib::PolyTree clipped;
-	if (clip) {
-		if (!clipper.Execute(ClipperLib::ctIntersection, clipped)) {
-			fprintf(stderr, "Polygon clip failed\n");
-		}
-	} else {
-		if (!has_area) {
-			drawvec out;
-			return out;
-		}
-
-		if (!clipper.Execute(ClipperLib::ctUnion, clipped)) {
-			static bool complained = false;
-
-			if (!complained) {
-				fprintf(stderr, "Polygon clean failed\n");
-				complained = true;
+	for (size_t i = 0; i < geom.size(); i++) {
+		if (geom[i].op == VT_MOVETO) {
+			size_t j;
+			for (j = i + 1; j < geom.size(); j++) {
+				if (geom[j].op != VT_LINETO) {
+					break;
+				}
 			}
+
+			if (j >= i + 4) {
+				mapbox::geometry::linear_ring<long long> lr;
+
+				if (i != 0) {
+				}
+
+				for (size_t k = i; k < j; k++) {
+					lr.push_back(mapbox::geometry::point<long long>(geom[k].x, geom[k].y));
+					if (k != i) {
+					}
+				}
+
+				if (lr.size() >= 3) {
+					wagyu.add_ring(lr);
+				}
+			}
+
+			i = j - 1;
 		}
 	}
 
-	drawvec out;
+	mapbox::geometry::multi_polygon<long long> result;
+	wagyu.execute(mapbox::geometry::wagyu::clip_type_union, result, mapbox::geometry::wagyu::fill_type_even_odd, mapbox::geometry::wagyu::fill_type_even_odd);
 
-	for (int i = 0; i < clipped.ChildCount(); i++) {
-		decode_clipped(clipped.Childs[i], out);
-	}
+	drawvec ret;
 
-	return out;
+	decode_clipped(result, ret);
+	return ret;
 }
 
 /* pnpoly:
@@ -622,7 +702,131 @@ drawvec close_poly(drawvec &geom) {
 	return out;
 }
 
-static bool inside(draw d, int edge, long long minx, long long miny, long long maxx, long long maxy) {
+static bool inside(mapbox::geometry::point<long long> const &d, int edge, long long minx, long long miny, long long maxx, long long maxy) {
+	switch (edge) {
+	case 0:  // top
+		return d.y > miny;
+
+	case 1:  // right
+		return d.x < maxx;
+
+	case 2:  // bottom
+		return d.y < maxy;
+
+	case 3:  // left
+		return d.x > minx;
+	}
+
+	fprintf(stderr, "internal error inside\n");
+	exit(EXIT_FAILURE);
+}
+
+// http://stackoverflow.com/questions/563198/how-do-you-detect-where-two-line-segments-intersect
+static mapbox::geometry::point<long long> get_line_intersection(mapbox::geometry::point<long long> p0, mapbox::geometry::point<long long> p1, mapbox::geometry::point<long long> p2, mapbox::geometry::point<long long> p3) {
+	double s1_x = p1.x - p0.x;
+	double s1_y = p1.y - p0.y;
+	double s2_x = p3.x - p2.x;
+	double s2_y = p3.y - p2.y;
+
+	double t;
+	// s = (-s1_y * (p0.x - p2.x) + s1_x * (p0.y - p2.y)) / (-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);
+
+	return mapbox::geometry::point<long long>(p0.x + (t * s1_x), p0.y + (t * s1_y));
+}
+
+static mapbox::geometry::point<long long> intersect(mapbox::geometry::point<long long> a, mapbox::geometry::point<long long> b, int edge, long long minx, long long miny, long long maxx, long long maxy) {
+	switch (edge) {
+	case 0:  // top
+		return get_line_intersection(a, b, mapbox::geometry::point<long long>(minx, miny), mapbox::geometry::point<long long>(maxx, miny));
+		break;
+
+	case 1:  // right
+		return get_line_intersection(a, b, mapbox::geometry::point<long long>(maxx, miny), mapbox::geometry::point<long long>(maxx, maxy));
+		break;
+
+	case 2:  // bottom
+		return get_line_intersection(a, b, mapbox::geometry::point<long long>(maxx, maxy), mapbox::geometry::point<long long>(minx, maxy));
+		break;
+
+	case 3:  // left
+		return get_line_intersection(a, b, mapbox::geometry::point<long long>(minx, maxy), mapbox::geometry::point<long long>(minx, miny));
+		break;
+	}
+
+	fprintf(stderr, "internal error intersecting\n");
+	exit(EXIT_FAILURE);
+}
+
+// http://en.wikipedia.org/wiki/Sutherland%E2%80%93Hodgman_algorithm
+static mapbox::geometry::linear_ring<long long> clip_poly1(mapbox::geometry::linear_ring<long long> const &geom, long long minx, long long miny, long long maxx, long long maxy) {
+	mapbox::geometry::linear_ring<long long> out = geom;
+
+	for (int edge = 0; edge < 4; edge++) {
+		if (out.size() > 0) {
+			mapbox::geometry::linear_ring<long long> in = out;
+			out.resize(0);
+
+			mapbox::geometry::point<long long> S = in[in.size() - 1];
+
+			for (size_t e = 0; e < in.size(); e++) {
+				mapbox::geometry::point<long long> E = in[e];
+
+				if (inside(E, edge, minx, miny, maxx, maxy)) {
+					if (!inside(S, edge, minx, miny, maxx, maxy)) {
+						out.push_back(intersect(S, E, edge, minx, miny, maxx, maxy));
+					}
+					out.push_back(E);
+				} else if (inside(S, edge, minx, miny, maxx, maxy)) {
+					out.push_back(intersect(S, E, edge, minx, miny, maxx, maxy));
+				}
+
+				S = E;
+			}
+		}
+	}
+
+	if (out.size() > 0) {
+		// If the polygon begins and ends outside the edge,
+		// the starting and ending points will be left as the
+		// places where it intersects the edge. Need to add
+		// another point to close the loop.
+
+		if (out[0].x != out[out.size() - 1].x || out[0].y != out[out.size() - 1].y) {
+			out.push_back(out[0]);
+		}
+
+		if (out.size() < 3) {
+			// fprintf(stderr, "Polygon degenerated to a line segment\n");
+			out.clear();
+			return out;
+		}
+	}
+
+	return out;
+}
+
+mapbox::geometry::multi_polygon<long long> simple_clip_poly(mapbox::geometry::multi_polygon<long long> const &geom, long long minx, long long miny, long long maxx, long long maxy) {
+	mapbox::geometry::multi_polygon<long long> out;
+
+	for (size_t i = 0; i < geom.size(); i++) {
+		out.push_back(mapbox::geometry::polygon<long long>());
+		for (size_t j = 0; j < geom[i].size(); j++) {
+			out[out.size() - 1].push_back(clip_poly1(geom[i][j], minx, miny, maxx, maxy));
+		}
+	}
+
+	return out;
+}
+
+mapbox::geometry::multi_polygon<long long> simple_clip_poly(mapbox::geometry::multi_polygon<long long> const &geom, int z, int detail, int buffer) {
+	long long area = 1LL << (32 - z);
+	long long clip_buffer = buffer * area / 256;
+
+	return simple_clip_poly(geom, -clip_buffer, -clip_buffer, area + clip_buffer, area + clip_buffer);
+}
+
+static bool inside(draw const &d, int edge, long long minx, long long miny, long long maxx, long long maxy) {
 	switch (edge) {
 	case 0:  // top
 		return d.y > miny;
@@ -757,13 +961,6 @@ drawvec simple_clip_poly(drawvec &geom, long long minx, long long miny, long lon
 	return out;
 }
 
-drawvec simple_clip_poly(drawvec &geom, int z, int detail, int buffer) {
-	long long area = 1LL << (32 - z);
-	long long clip_buffer = buffer * area / 256;
-
-	return simple_clip_poly(geom, -clip_buffer, -clip_buffer, area + clip_buffer, area + clip_buffer);
-}
-
 drawvec reduce_tiny_poly(drawvec &geom, int z, int detail, bool *reduced, double *accum_area) {
 	drawvec out;
 	long long pixel = (1 << (32 - detail - z)) * 2;
@@ -843,8 +1040,8 @@ drawvec reduce_tiny_poly(drawvec &geom, int z, int detail, bool *reduced, double
 	return out;
 }
 
-drawvec clip_point(drawvec &geom, int z, int detail, long long buffer) {
-	drawvec out;
+mapbox::geometry::multi_point<long long> clip_points(mapbox::geometry::multi_point<long long> const &geom, int z, int detail, long long buffer) {
+	mapbox::geometry::multi_point<long long> out;
 
 	long long min = 0;
 	long long area = 1LL << (32 - z);
@@ -894,8 +1091,8 @@ bool point_within_tile(long long x, long long y, int z, int detail, long long bu
 	return x >= 0 && y >= 0 && x < area && y < area;
 }
 
-drawvec clip_lines(drawvec &geom, int z, int detail, long long buffer) {
-	drawvec out;
+mapbox::geometry::multi_line_string<long long> clip_lines(mapbox::geometry::multi_line_string<long long> const &geom, int z, int detail, long long buffer) {
+	mapbox::geometry::multi_line_string<long long> out;
 
 	long long min = 0;
 	long long area = 1LL << (32 - z);
@@ -903,26 +1100,33 @@ drawvec clip_lines(drawvec &geom, int z, int detail, long long buffer) {
 	area += buffer * area / 256;
 
 	for (size_t i = 0; i < geom.size(); i++) {
-		if (i > 0 && (geom[i - 1].op == VT_MOVETO || geom[i - 1].op == VT_LINETO) && geom[i].op == VT_LINETO) {
-			double x1 = geom[i - 1].x;
-			double y1 = geom[i - 1].y;
+		out.emplace_back();
+		if (geom[i].size() > 0) {
+			out[out.size() - 1].push_back(geom[i][0]);
+		}
 
-			double x2 = geom[i - 0].x;
-			double y2 = geom[i - 0].y;
+		for (size_t j = 0; j + 1 < geom[i].size(); j++) {
+			double x1 = geom[i][j].x;
+			double y1 = geom[i][j].y;
+
+			double x2 = geom[i][j + 1].x;
+			double y2 = geom[i][j + 1].y;
 
 			int c = clip(&x1, &y1, &x2, &y2, min, min, area, area);
 
 			if (c > 1) {  // clipped
-				out.push_back(draw(VT_MOVETO, x1, y1));
-				out.push_back(draw(VT_LINETO, x2, y2));
-				out.push_back(draw(VT_MOVETO, geom[i].x, geom[i].y));
+				out.emplace_back();
+				out[out.size() - 1].emplace_back(x1, y1);
+				out[out.size() - 1].emplace_back(x2, y2);
+
+				out.emplace_back();
+				out[out.size() - 1].push_back(geom[i][j + 1]);
 			} else if (c == 1) {  // unchanged
-				out.push_back(geom[i]);
+				out[out.size() - 1].push_back(geom[i][j + 1]);
 			} else {  // clipped away entirely
-				out.push_back(draw(VT_MOVETO, geom[i].x, geom[i].y));
+				out.emplace_back();
+				out[out.size() - 1].push_back(geom[i][j + 1]);
 			}
-		} else {
-			out.push_back(geom[i]);
 		}
 	}
 
@@ -1370,3 +1574,55 @@ static int clip(double *x0, double *y0, double *x1, double *y1, double xmin, dou
 		return changed + 1;
 	}
 }
+
+struct clip_visitor {
+	int z;
+	int line_detail;
+	int buffer;
+
+	clip_visitor(int iz, int iline_detail, int ibuffer) {
+		z = iz;
+		line_detail = iline_detail;
+		buffer = ibuffer;
+	}
+
+	mapbox::geometry::geometry<long long> operator()(mapbox::geometry::point<long long> const &val) const {
+		mapbox::geometry::multi_point<long long> mp;
+		mp.push_back(val);
+		return clip_points(mp, z, line_detail, buffer);
+	}
+
+	mapbox::geometry::geometry<long long> operator()(mapbox::geometry::multi_point<long long> const &val) const {
+		return clip_points(val, z, line_detail, buffer);
+	}
+
+	mapbox::geometry::geometry<long long> operator()(mapbox::geometry::line_string<long long> const &val) const {
+		mapbox::geometry::multi_line_string<long long> mls;
+		mls.push_back(val);
+		return clip_lines(mls, z, line_detail, buffer);
+	}
+
+	mapbox::geometry::geometry<long long> operator()(mapbox::geometry::multi_line_string<long long> const &val) const {
+		return clip_lines(val, z, line_detail, buffer);
+	}
+
+	mapbox::geometry::geometry<long long> operator()(mapbox::geometry::polygon<long long> const &val) const {
+		mapbox::geometry::multi_polygon<long long> mp;
+		mp.push_back(val);
+		return simple_clip_poly(mp, z, line_detail, buffer);
+	}
+
+	mapbox::geometry::geometry<long long> operator()(mapbox::geometry::multi_polygon<long long> const &val) const {
+		return simple_clip_poly(val, z, line_detail, buffer);
+	}
+
+	mapbox::geometry::geometry<long long> operator()(mapbox::geometry::geometry_collection<long long> const &val) const {
+		fprintf(stderr, "Geometry collections not supported\n");
+		exit(EXIT_FAILURE);
+	}
+};
+
+mapbox::geometry::geometry<long long> clip(mapbox::geometry::geometry<long long> const &g, int z, int line_detail, int buffer) {
+	clip_visitor cv = clip_visitor(z, line_detail, buffer);
+	return mapbox::util::apply_visitor(cv, g);
+}

geometry.hpp

@@ -1,3 +1,6 @@
+#include <mapbox/geometry/geometry.hpp>
+#include <cstdint>
+
 #define VT_POINT 1
 #define VT_LINE 2
 #define VT_POLYGON 3
@@ -56,12 +59,9 @@ typedef std::vector<draw> drawvec;
 drawvec decode_geometry(FILE *meta, long long *geompos, int z, unsigned tx, unsigned ty, int detail, long long *bbox, unsigned initial_x, unsigned initial_y);
 void to_tile_scale(drawvec &geom, int z, int detail);
 drawvec remove_noop(drawvec geom, int type, int shift);
-drawvec clip_point(drawvec &geom, int z, int detail, long long buffer);
 drawvec clean_or_clip_poly(drawvec &geom, int z, int detail, int buffer, bool clip);
-drawvec simple_clip_poly(drawvec &geom, int z, int detail, int buffer);
 drawvec close_poly(drawvec &geom);
 drawvec reduce_tiny_poly(drawvec &geom, int z, int detail, bool *reduced, double *accum_area);
-drawvec clip_lines(drawvec &geom, int z, int detail, long long buffer);
 bool point_within_tile(long long x, long long y, int z, int detail, long long buffer);
 int quick_check(long long *bbox, int z, int detail, long long buffer);
 drawvec simplify_lines(drawvec &geom, int z, int detail, bool mark_tile_bounds, double simplification, bool already_marked);
@@ -70,3 +70,7 @@ drawvec fix_polygon(drawvec &geom);
 std::vector<drawvec> chop_polygon(std::vector<drawvec> &geoms);
 void check_polygon(drawvec &geom, drawvec &before);
 double get_area(drawvec &geom, size_t i, size_t j);
+
+drawvec to_drawvec(mapbox::geometry::geometry<long long> const &g, int &type);
+mapbox::geometry::geometry<long long> from_drawvec(int type, drawvec const &dv);
+mapbox::geometry::geometry<long long> clip(mapbox::geometry::geometry<long long> const &g, int z, int line_detail, int buffer);

main.cpp

@@ -120,6 +120,7 @@ void init_cpus() {
 	if (CPUS < 1) {
 		CPUS = 1;
 	}
+	CPUS = 1;
 
 	// Guard against short struct index.segment
 	if (CPUS > 32767) {

mvt.cpp

@@ -118,38 +118,31 @@ bool mvt_tile::decode(std::string &message) {
 					while (value_reader.next()) {
 						switch (value_reader.tag()) {
 						case 1: /* string */
-							value.type = mvt_string;
-							value.string_value = value_reader.get_string();
+							value = value_reader.get_string();
 							break;
 
 						case 2: /* float */
-							value.type = mvt_float;
-							value.numeric_value.float_value = value_reader.get_float();
+							value = (double) value_reader.get_float();
 							break;
 
 						case 3: /* double */
-							value.type = mvt_double;
-							value.numeric_value.double_value = value_reader.get_double();
+							value = value_reader.get_double();
 							break;
 
 						case 4: /* int */
-							value.type = mvt_int;
-							value.numeric_value.int_value = value_reader.get_int64();
+							value = value_reader.get_int64();
 							break;
 
 						case 5: /* uint */
-							value.type = mvt_uint;
-							value.numeric_value.uint_value = value_reader.get_uint64();
+							value = value_reader.get_uint64();
 							break;
 
 						case 6: /* sint */
-							value.type = mvt_sint;
-							value.numeric_value.sint_value = value_reader.get_sint64();
+							value = value_reader.get_sint64();
 							break;
 
 						case 7: /* bool */
-							value.type = mvt_bool;
-							value.numeric_value.bool_value = value_reader.get_bool();
+							value = value_reader.get_bool();
 							break;
 
 						default:
@@ -260,7 +253,66 @@ bool mvt_tile::decode(std::string &message) {
 	return true;
 }
 
+struct write_visitor {
+	protozero::pbf_writer *writer;
+
+	write_visitor(protozero::pbf_writer *w) {
+		writer = w;
+	}
+
+	void operator()(std::string &val) const {
+		writer->add_string(1, val);
+	}
+
+	void operator()(float val) const {
+		writer->add_float(2, val);
+	}
+
+	void operator()(double val) const {
+		writer->add_double(3, val);
+	}
+
+	void operator()(int64_t val) const {
+		writer->add_int64(4, val);
+	}
+
+	void operator()(uint64_t val) const {
+		writer->add_uint64(5, val);
+	}
+
+#if 0  // not defined in the variant
+	void operator()(sint64_t val) {
+		writer->add_sint64(6, val);
+	}
+#endif
+
+	void operator()(bool val) const {
+		writer->add_bool(7, val);
+	}
+
+	void operator()(std::nullptr_t val) const {
+		fprintf(stderr, "Can't happen: Null value in tile\n");
+		exit(EXIT_FAILURE);
+	}
+
+	void operator()(mapbox::geometry::null_value_t val) const {
+		fprintf(stderr, "Can't happen: Null value in tile\n");
+		exit(EXIT_FAILURE);
+	}
+
+	void operator()(std::vector<mvt_value> &val) const {
+		fprintf(stderr, "Can't happen: Vector value in tile\n");
+		exit(EXIT_FAILURE);
+	}
+
+	void operator()(std::unordered_map<std::string, mvt_value> &val) const {
+		fprintf(stderr, "Can't happen: Hash table value in tile\n");
+		exit(EXIT_FAILURE);
+	}
+};
+
 std::string mvt_tile::encode() {
+	mapbox::geometry::value va;
 	std::string data;
 
 	protozero::pbf_writer writer(data);
@@ -280,23 +332,9 @@ std::string mvt_tile::encode() {
 		for (size_t v = 0; v < layers[i].values.size(); v++) {
 			std::string value_string;
 			protozero::pbf_writer value_writer(value_string);
-			mvt_value &pbv = layers[i].values[v];
 
-			if (pbv.type == mvt_string) {
-				value_writer.add_string(1, pbv.string_value);
-			} else if (pbv.type == mvt_float) {
-				value_writer.add_float(2, pbv.numeric_value.float_value);
-			} else if (pbv.type == mvt_double) {
-				value_writer.add_double(3, pbv.numeric_value.double_value);
-			} else if (pbv.type == mvt_int) {
-				value_writer.add_int64(4, pbv.numeric_value.int_value);
-			} else if (pbv.type == mvt_uint) {
-				value_writer.add_uint64(5, pbv.numeric_value.uint_value);
-			} else if (pbv.type == mvt_sint) {
-				value_writer.add_sint64(6, pbv.numeric_value.sint_value);
-			} else if (pbv.type == mvt_bool) {
-				value_writer.add_bool(7, pbv.numeric_value.bool_value);
-			}
+			mvt_value &pbv = layers[i].values[v];
+			mapbox::util::apply_visitor(write_visitor(&value_writer), pbv);
 
 			layer_writer.add_message(4, value_string);
 		}
@@ -373,25 +411,6 @@ std::string mvt_tile::encode() {
 	return compressed;
 }
 
-bool mvt_value::operator<(const mvt_value &o) const {
-	if (type < o.type) {
-		return true;
-	}
-	if (type == o.type) {
-		if ((type == mvt_string && string_value < o.string_value) ||
-		    (type == mvt_float && numeric_value.float_value < o.numeric_value.float_value) ||
-		    (type == mvt_double && numeric_value.double_value < o.numeric_value.double_value) ||
-		    (type == mvt_int && numeric_value.int_value < o.numeric_value.int_value) ||
-		    (type == mvt_uint && numeric_value.uint_value < o.numeric_value.uint_value) ||
-		    (type == mvt_sint && numeric_value.sint_value < o.numeric_value.sint_value) ||
-		    (type == mvt_bool && numeric_value.bool_value < o.numeric_value.bool_value)) {
-			return true;
-		}
-	}
-
-	return false;
-}
-
 void mvt_layer::tag(mvt_feature &feature, std::string key, mvt_value value) {
 	size_t ko, vo;
 
@@ -417,3 +436,68 @@ void mvt_layer::tag(mvt_feature &feature, std::string key, mvt_value value) {
 	feature.tags.push_back(ko);
 	feature.tags.push_back(vo);
 }
+
+struct stringify_visitor {
+	std::string operator()(std::string const &val) const {
+		return std::string("s") + std::string(val);
+	}
+
+	std::string operator()(float val) const {
+		char *s;
+		asprintf(&s, "f%f", val);
+		std::string ret(s);
+		free(s);
+		return ret;
+	}
+
+	std::string operator()(double val) const {
+		char *s;
+		asprintf(&s, "d%lf", val);
+		std::string ret(s);
+		free(s);
+		return ret;
+	}
+
+	std::string operator()(int64_t val) const {
+		char *s;
+		asprintf(&s, "i%lld", (long long) val);
+		std::string ret(s);
+		free(s);
+		return ret;
+	}
+
+	std::string operator()(uint64_t val) const {
+		char *s;
+		asprintf(&s, "u%llu", (unsigned long long) val);
+		std::string ret(s);
+		free(s);
+		return ret;
+	}
+
+	std::string operator()(bool val) const {
+		return std::string("b") + (val ? std::string("true") : std::string("false"));
+	}
+
+	std::string operator()(std::nullptr_t val) const {
+		return std::string("n");
+	}
+
+	std::string operator()(mapbox::geometry::null_value_t val) const {
+		return std::string("n");
+	}
+
+	std::string operator()(std::vector<mvt_value> const &val) const {
+		return std::string("v");
+	}
+
+	std::string operator()(std::unordered_map<std::string, mvt_value> const &val) const {
+		return std::string("m");
+	}
+};
+
+bool mvt_value_cmp::operator()(const mvt_value &a, const mvt_value &b) const {
+	std::string as = mapbox::util::apply_visitor(stringify_visitor(), a);
+	std::string bs = mapbox::util::apply_visitor(stringify_visitor(), b);
+
+	return as < bs;
+}

mvt.hpp

@@ -1,4 +1,6 @@
-struct mvt_value;
+#include <mapbox/geometry/feature.hpp>
+
+typedef mapbox::geometry::value mvt_value;
 struct mvt_layer;
 
 enum mvt_operation {
@@ -34,29 +36,8 @@ struct mvt_feature {
 	}
 };
 
-enum mvt_value_type {
-	mvt_string,
-	mvt_float,
-	mvt_double,
-	mvt_int,
-	mvt_uint,
-	mvt_sint,
-	mvt_bool
-};
-
-struct mvt_value {
-	mvt_value_type type;
-	std::string string_value;
-	union {
-		float float_value;
-		double double_value;
-		long long int_value;
-		unsigned long long uint_value;
-		long long sint_value;
-		bool bool_value;
-	} numeric_value;
-
-	bool operator<(const mvt_value &o) const;
+struct mvt_value_cmp {
+	bool operator()(const mvt_value &a, const mvt_value &b) const;
 };
 
 struct mvt_layer {
@@ -72,7 +53,7 @@ struct mvt_layer {
 
 	// For tracking the key-value constants already used in this layer
 	std::map<std::string, size_t> key_map;
-	std::map<mvt_value, size_t> value_map;
+	std::map<mvt_value, size_t, mvt_value_cmp> value_map;
 };
 
 struct mvt_tile {

tests/curve/out/-z2.json

@@ -12,119 +12,119 @@
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+{ "type": "Feature", "properties": {  }, "geometry": { "type": "Polygon", "coordinates": [ [ [ -99.052734, 83.004844 ], [ -82.001953, 82.009169 ], [ -106.083984, 70.020587 ], [ -103.007812, 32.026706 ], [ -82.001953, -32.990236 ], [ -63.017578, -62.995158 ], [ -28.037109, -72.996909 ], [ 90.000000, -73.995328 ], [ 144.931641, -73.995328 ], [ 144.931641, -76.999935 ], [ 92.988281, -78.988187 ], [ -33.046875, -76.999935 ], [ -75.058594, -65.982270 ], [ -97.031250, -37.996163 ], [ -118.037109, 26.037042 ], [ -117.070312, 71.016960 ], [ -99.052734, 83.004844 ] ] ] } }
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tests/curve/out/-z2_--no-duplication.json

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tests/dateline/out/-z5.json

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tests/nullisland/out/-b0_-z4_-ANullIsland.json

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tests/overlap/out/-z0.json

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tests/overlap/out/-z0_--coalesce.json

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tests/wyalkatchem/out/-pk_-pf_-Z9_-z12_-ldata.json

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+{ "type": "Feature", "id": 10959577660569731, "properties": { "country": "au", "text": "Wyalkatchem" }, "geometry": { "type": "Polygon", "coordinates": [ [ [ 117.445650, -31.052732 ], [ 117.447710, -31.052934 ], [ 117.455392, -31.053688 ], [ 117.457752, -31.054405 ], [ 117.420158, -31.052732 ], [ 117.445650, -31.052732 ] ] ] } }
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 ] }

tile-join.cpp

@@ -29,6 +29,53 @@ struct stats {
 	double minlat, minlon, maxlat, maxlon;
 };
 
+struct to_string_visitor {
+	std::string value;
+	int type = -1;
+
+	void operator()(std::string const &val) {
+		value = val;
+		type = VT_STRING;
+	}
+
+	void operator()(float val) {
+		aprintf(&value, "%g", val);
+		type = VT_NUMBER;
+	}
+
+	void operator()(double val) {
+		aprintf(&value, "%g", val);
+		type = VT_NUMBER;
+	}
+
+	void operator()(int64_t val) {
+		aprintf(&value, "%lld", (long long) val);
+		type = VT_NUMBER;
+	}
+
+	void operator()(uint64_t val) {
+		aprintf(&value, "%llu", (unsigned long long) val);
+		type = VT_NUMBER;
+	}
+
+	void operator()(bool val) {
+		aprintf(&value, "%s", val ? "true" : "false");
+		type = VT_BOOLEAN;
+	}
+
+	void operator()(std::nullptr_t val) {
+	}
+
+	void operator()(mapbox::geometry::null_value_t val) {
+	}
+
+	void operator()(std::vector<mvt_value> const &val) {
+	}
+
+	void operator()(std::unordered_map<std::string, mvt_value> const &val) {
+	}
+};
+
 void handle(std::string message, int z, unsigned x, unsigned y, std::map<std::string, layermap_entry> &layermap, std::vector<std::string> &header, std::map<std::string, std::vector<std::string>> &mapping, std::set<std::string> &exclude, int ifmatched, mvt_tile &outtile) {
 	mvt_tile tile;
 	int features_added = 0;
@@ -92,48 +139,24 @@ void handle(std::string message, int z, unsigned x, unsigned y, std::map<std::st
 			for (size_t t = 0; t + 1 < feat.tags.size(); t += 2) {
 				const char *key = layer.keys[feat.tags[t]].c_str();
 				mvt_value &val = layer.values[feat.tags[t + 1]];
-				std::string value;
-				int type = -1;
 
-				if (val.type == mvt_string) {
-					value = val.string_value;
-					type = VT_STRING;
-				} else if (val.type == mvt_int) {
-					aprintf(&value, "%lld", (long long) val.numeric_value.int_value);
-					type = VT_NUMBER;
-				} else if (val.type == mvt_double) {
-					aprintf(&value, "%g", val.numeric_value.double_value);
-					type = VT_NUMBER;
-				} else if (val.type == mvt_float) {
-					aprintf(&value, "%g", val.numeric_value.float_value);
-					type = VT_NUMBER;
-				} else if (val.type == mvt_bool) {
-					aprintf(&value, "%s", val.numeric_value.bool_value ? "true" : "false");
-					type = VT_BOOLEAN;
-				} else if (val.type == mvt_sint) {
-					aprintf(&value, "%lld", (long long) val.numeric_value.sint_value);
-					type = VT_NUMBER;
-				} else if (val.type == mvt_uint) {
-					aprintf(&value, "%llu", (long long) val.numeric_value.uint_value);
-					type = VT_NUMBER;
-				} else {
-					continue;
-				}
+				to_string_visitor v;
+				mapbox::util::apply_visitor(v, val);
 
-				if (type < 0) {
+				if (v.type < 0) {
 					continue;
 				}
 
 				if (exclude.count(std::string(key)) == 0) {
 					type_and_string tas;
 					tas.string = std::string(key);
-					tas.type = type;
+					tas.type = v.type;
 					file_keys->second.file_keys.insert(tas);
 					outlayer.tag(outfeature, layer.keys[feat.tags[t]], val);
 				}
 
 				if (header.size() > 0 && strcmp(key, header[0].c_str()) == 0) {
-					std::map<std::string, std::vector<std::string>>::iterator ii = mapping.find(value);
+					std::map<std::string, std::vector<std::string>>::iterator ii = mapping.find(v.value);
 
 					if (ii != mapping.end()) {
 						std::vector<std::string> fields = ii->second;
@@ -162,11 +185,9 @@ void handle(std::string message, int z, unsigned x, unsigned y, std::map<std::st
 
 								mvt_value outval;
 								if (attr_type == VT_STRING) {
-									outval.type = mvt_string;
-									outval.string_value = joinval;
+									outval = joinval;
 								} else {
-									outval.type = mvt_double;
-									outval.numeric_value.double_value = atof(joinval.c_str());
+									outval = atof(joinval.c_str());
 								}
 
 								outlayer.tag(outfeature, joinkey, outval);

tile.cpp

@@ -42,7 +42,7 @@ std::vector<mvt_geometry> to_feature(drawvec &geom) {
 	std::vector<mvt_geometry> out;
 
 	for (size_t i = 0; i < geom.size(); i++) {
-		out.push_back(mvt_geometry(geom[i].op, geom[i].x, geom[i].y));
+		out.emplace_back(geom[i].op, (long long) geom[i].x, (long long) geom[i].y);
 	}
 
 	return out;
@@ -139,22 +139,17 @@ mvt_value retrieve_string(long long off, char *stringpool, int *otype) {
 		long long v;
 		if (is_integer(s, &v)) {
 			if (v >= 0) {
-				tv.type = mvt_int;
-				tv.numeric_value.int_value = v;
+				tv = (unsigned long long) v;
 			} else {
-				tv.type = mvt_sint;
-				tv.numeric_value.sint_value = v;
+				tv = v;
 			}
 		} else {
-			tv.type = mvt_double;
-			tv.numeric_value.double_value = atof(s);
+			tv = atof(s);
 		}
 	} else if (type == VT_BOOLEAN) {
-		tv.type = mvt_bool;
-		tv.numeric_value.bool_value = (s[0] == 't');
+		tv = (s[0] == 't');
 	} else {
-		tv.type = mvt_string;
-		tv.string_value = s;
+		tv = std::string(s);
 	}
 
 	return tv;
@@ -167,7 +162,7 @@ void decode_meta(int m, std::vector<long long> &metakeys, std::vector<long long>
 		mvt_value key = retrieve_string(metakeys[i], stringpool, NULL);
 		mvt_value value = retrieve_string(metavals[i], stringpool, &otype);
 
-		layer.tag(feature, key.string_value, value);
+		layer.tag(feature, key.get<std::string>(), value);
 	}
 }
 
@@ -182,9 +177,9 @@ int metacmp(int m1, const std::vector<long long> &keys1, const std::vector<long
 		mvt_value key1 = retrieve_string(keys1[i], stringpool1, NULL);
 		mvt_value key2 = retrieve_string(keys2[i], stringpool2, NULL);
 
-		if (key1.string_value < key2.string_value) {
+		if (key1.get<std::string>() < key2.get<std::string>()) {
 			return -1;
-		} else if (key1.string_value > key2.string_value) {
+		} else if (key1.get<std::string>() > key2.get<std::string>()) {
 			return 1;
 		}
 
@@ -1028,8 +1023,9 @@ long long write_tile(FILE *geoms, long long *geompos_in, char *metabase, char *s
 		}
 
 		while (1) {
-			signed char t;
-			deserialize_byte_io(geoms, &t, geompos_in);
+			signed char bt;
+			deserialize_byte_io(geoms, &bt, geompos_in);
+			int t = bt;
 			if (t < 0) {
 				break;
 			}
@@ -1141,15 +1137,9 @@ long long write_tile(FILE *geoms, long long *geompos_in, char *metabase, char *s
 				// so that we can know whether the feature itself, or only the feature's
 				// bounding box, touches the tile.
 
-				if (t == VT_LINE) {
-					clipped = clip_lines(geom, z, line_detail, buffer);
-				}
-				if (t == VT_POLYGON) {
-					clipped = simple_clip_poly(geom, z, line_detail, buffer);
-				}
-				if (t == VT_POINT) {
-					clipped = clip_point(geom, z, line_detail, buffer);
-				}
+				mapbox::geometry::geometry<long long> g = from_drawvec(t, geom);
+				g = clip(g, z, line_detail, buffer);
+				clipped = to_drawvec(g, t);
 
 				clipped = remove_noop(clipped, t, 0);
 
@@ -1384,6 +1374,9 @@ long long write_tile(FILE *geoms, long long *geompos_in, char *metabase, char *s
 						layer_features[x].geom = clean_or_clip_poly(layer_features[x].geom, 0, 0, 0, false);
 					}
 
+					mapbox::geometry::geometry<long long> g = from_drawvec(layer_features[x].type, layer_features[x].geom);
+					layer_features[x].geom = to_drawvec(g, layer_features[x].type);
+
 					layer_features[x].geom = close_poly(layer_features[x].geom);
 				}
 
@@ -1437,9 +1430,7 @@ long long write_tile(FILE *geoms, long long *geompos_in, char *metabase, char *s
 							glow = 255;
 						}
 					}
-					mvt_value v;
-					v.type = mvt_sint;
-					v.numeric_value.sint_value = glow;
+					mvt_value v = (double) glow;
 					layer.tag(feature, "tippecanoe_feature_density", v);
 				}