[core] Add `symbol-placement: line-center`

- Remove unused/vestigial 'maxCameraDistance'
- Create a single collision circle for line labels that are less than half the width of a collision circle

1 files changed, 2 insertions, 1 deletions

diff --git a/include/mbgl/style/types.hpp b/include/mbgl/style/types.hpp
index 44c11186b8..805cff118c 100644
--- a/include/mbgl/style/types.hpp
+++ b/include/mbgl/style/types.hpp
@@ -63,9 +63,10 @@ enum class CirclePitchScaleType : bool {
     Viewport,
 };
 
-enum class SymbolPlacementType : bool {
+enum class SymbolPlacementType : uint8_t {
     Point,
     Line,
+    LineCenter
 };
 
 enum class AlignmentType : uint8_t {