[core] Use the right types for zoom scale logic

32 bit integers should be enough for zoom scale logic. In shape
annotation logic, 'maxAmountOfTileFeatures' requires 64 bits because we
are multiplying the zoom scale with the extent, which might give a
number higher than std::numeric_limits<uint32_t>::max().

3 files changed, 6 insertions, 6 deletions

diff --git a/include/mbgl/util/constants.hpp b/include/mbgl/util/constants.hpp
index 607c388e95..3c0b3eb93e 100644
--- a/include/mbgl/util/constants.hpp
+++ b/include/mbgl/util/constants.hpp
@@ -18,7 +18,7 @@ constexpr float tileSize = 512;
  * In practice, all features are converted to this extent before being added.
  *
  * Positions are stored as signed 16bit integers.
- * One bit is lost for signedness to support featuers extending past the left edge of the tile.
+ * One bit is lost for signedness to support features extending past the left edge of the tile.
  * One bit is lost because the line vertex buffer packs 1 bit of other data into the int.
  * One bit is lost to support features extending past the extent on the right edge of the tile.
  * This leaves us with 2^13 = 8192
diff --git a/src/mbgl/annotation/shape_annotation_impl.cpp b/src/mbgl/annotation/shape_annotation_impl.cpp
index a61611cf18..f22debdd81 100644
--- a/src/mbgl/annotation/shape_annotation_impl.cpp
+++ b/src/mbgl/annotation/shape_annotation_impl.cpp
@@ -90,8 +90,8 @@ void ShapeAnnotationImpl::updateTileData(const CanonicalTileID& tileID, Annotati
     static const double baseTolerance = 4;
 
     if (!shapeTiler) {
-        const uint64_t maxAmountOfTiles = 1 << maxZoom;
-        const double tolerance = baseTolerance / (maxAmountOfTiles * util::EXTENT);
+        const uint64_t maxAmountOfTileFeatures = (1ull << maxZoom) * util::EXTENT;
+        const double tolerance = baseTolerance / maxAmountOfTileFeatures;
 
         std::vector<geojsonvt::ProjectedFeature> features = {
             ShapeAnnotationGeometry::visit(geometry(), ToGeoJSONVT(tolerance))
diff --git a/src/mbgl/map/transform_state.cpp b/src/mbgl/map/transform_state.cpp
index fab5991de8..3d5a1a6798 100644
--- a/src/mbgl/map/transform_state.cpp
+++ b/src/mbgl/map/transform_state.cpp
@@ -16,13 +16,13 @@ TransformState::TransformState(ConstrainMode constrainMode_, ViewportMode viewpo
 #pragma mark - Matrix
 
 void TransformState::matrixFor(mat4& matrix, const UnwrappedTileID& tileID) const {
-    const uint64_t tileScale = 1ull << tileID.canonical.z;
+    const uint32_t tileScale = 1u << tileID.canonical.z;
     const double s = worldSize() / tileScale;
 
     matrix::identity(matrix);
     matrix::translate(matrix, matrix,
-                      static_cast<int64_t>(tileID.canonical.x + tileID.wrap * tileScale) * s,
-                      static_cast<int64_t>(tileID.canonical.y) * s, 0);
+                      int64_t(tileID.canonical.x + tileID.wrap * tileScale) * s,
+                      int64_t(tileID.canonical.y) * s, 0);
     matrix::scale(matrix, matrix, s / util::EXTENT, s / util::EXTENT, 1);
 }