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Fix crash in case of empty ring

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This commit is contained in:
Jiri Drbalek 2018-01-17 09:53:45 +00:00
parent ab4e1b77d0
commit ec53f3d879
2 changed files with 67 additions and 1 deletions
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6
include/mapnik/geometry/polygon_vertex_processor.hpp
View file

@ -24,6 +24,7 @@
#define MAPNIK_GEOMETRY_POLYGON_VERTEX_PROCESSOR_HPP
// geometry
#include <mapnik/geometry/point.hpp>
#include <mapnik/geometry/polygon.hpp>
namespace mapnik { namespace geometry {
@ -46,7 +47,10 @@ struct polygon_vertex_processor
ring.emplace_back(p);
break;
case SEG_CLOSE:
ring.emplace_back(ring.front());
if (!ring.empty())
{
ring.emplace_back(ring.front());
}
polygon_.emplace_back(std::move(ring));
ring = linear_ring<T>();
break;

62
test/unit/geometry/polygon_vertex_processor.cpp Normal file
View file

@ -0,0 +1,62 @@
#include "catch.hpp"
#include "unit/vertex_adapter/fake_path.hpp"
#include <mapnik/geometry/polygon_vertex_processor.hpp>
TEST_CASE("polygon_vertex_processor") {
SECTION("empty polygon") {
fake_path path = {};
mapnik::geometry::polygon_vertex_processor<double> proc;
proc.add_path(path);
CHECK(proc.polygon_.size() == 0);
}
SECTION("empty outer ring") {
fake_path path = {};
path.vertices_.emplace_back(0, 0, mapnik::SEG_CLOSE);
path.rewind(0);
mapnik::geometry::polygon_vertex_processor<double> proc;
proc.add_path(path);
REQUIRE(proc.polygon_.size() == 1);
REQUIRE(proc.polygon_.front().size() == 0);
}
SECTION("empty inner ring") {
fake_path path = {};
path.vertices_.emplace_back(-1, -1, mapnik::SEG_MOVETO);
path.vertices_.emplace_back( 1, -1, mapnik::SEG_LINETO);
path.vertices_.emplace_back( 1, 1, mapnik::SEG_LINETO);
path.vertices_.emplace_back(-1, 1, mapnik::SEG_LINETO);
path.vertices_.emplace_back( 0, 0, mapnik::SEG_CLOSE);
path.vertices_.emplace_back( 0, 0, mapnik::SEG_CLOSE);
path.rewind(0);
mapnik::geometry::polygon_vertex_processor<double> proc;
proc.add_path(path);
REQUIRE(proc.polygon_.size() == 2);
auto outer_ring = proc.polygon_.front();
REQUIRE(outer_ring.size() == 5);
CHECK(outer_ring[0].x == Approx(-1));
CHECK(outer_ring[0].y == Approx(-1));
CHECK(outer_ring[1].x == Approx( 1));
CHECK(outer_ring[1].y == Approx(-1));
CHECK(outer_ring[2].x == Approx( 1));
CHECK(outer_ring[2].y == Approx( 1));
CHECK(outer_ring[3].x == Approx(-1));
CHECK(outer_ring[3].y == Approx( 1));
CHECK(outer_ring[4].x == Approx(-1));
CHECK(outer_ring[4].y == Approx(-1));
}
}