[core] fix infinite loop in mbgl::resample

fix #4416

3 files changed, 5 insertions, 2 deletions

diff --git a/src/mbgl/renderer/line_bucket.cpp b/src/mbgl/renderer/line_bucket.cpp
index ac9a3f7231..dfaa93419c 100644
--- a/src/mbgl/renderer/line_bucket.cpp
+++ b/src/mbgl/renderer/line_bucket.cpp
@@ -69,7 +69,7 @@ void LineBucket::addGeometry(const GeometryCoordinates& vertices) {
 
     const float miterLimit = layout.join == JoinType::Bevel ? 1.05f : float(layout.miterLimit);
 
-    const double sharpCornerOffset = SHARP_CORNER_OFFSET * (util::EXTENT / (util::tileSize * overscaling));
+    const double sharpCornerOffset = SHARP_CORNER_OFFSET * (float(util::EXTENT) / (util::tileSize * overscaling));
 
     const GeometryCoordinate firstVertex = vertices.front();
     const GeometryCoordinate lastVertex = vertices[len - 1];
diff --git a/src/mbgl/renderer/symbol_bucket.cpp b/src/mbgl/renderer/symbol_bucket.cpp
index 404a62d374..6530510e27 100644
--- a/src/mbgl/renderer/symbol_bucket.cpp
+++ b/src/mbgl/renderer/symbol_bucket.cpp
@@ -60,7 +60,7 @@ SymbolBucket::SymbolBucket(uint32_t overscaling_, float zoom_, const MapMode mod
     : overscaling(overscaling_),
       zoom(zoom_),
       tileSize(util::tileSize * overscaling_),
-      tilePixelRatio(util::EXTENT / tileSize),
+      tilePixelRatio(float(util::EXTENT) / tileSize),
       mode(mode_) {}
 
 SymbolBucket::~SymbolBucket() {
diff --git a/src/mbgl/text/get_anchors.cpp b/src/mbgl/text/get_anchors.cpp
index 740ec288b3..c55f238e52 100644
--- a/src/mbgl/text/get_anchors.cpp
+++ b/src/mbgl/text/get_anchors.cpp
@@ -3,6 +3,7 @@
 #include <mbgl/util/constants.hpp>
 #include <mbgl/util/interpolate.hpp>
 
+#include <cassert>
 #include <cmath>
 
 namespace mbgl {
@@ -21,6 +22,8 @@ Anchors resample(const GeometryCoordinates &line, const float offset, const floa
 
     Anchors anchors;
 
+    assert(spacing > 0.0);
+
     int i = 0;
     for (auto it = line.begin(), end = line.end() - 1; it != end; it++, i++) {
         const GeometryCoordinate &a = *(it);