Consolidate duplicate interpolation definitions

While here, do not interpolate style properties that
are not transitionable. The previous behavior was to
switch from old to new value halfway through the transition;
now the new value is used immediately, as in JS.

1 files changed, 1 insertions, 0 deletions

diff --git a/include/mbgl/style/style_layer.hpp b/include/mbgl/style/style_layer.hpp
index f8cfff7f63..84981e3fb4 100644
--- a/include/mbgl/style/style_layer.hpp
+++ b/include/mbgl/style/style_layer.hpp
@@ -51,6 +51,7 @@ private:
     // aplied classes in order.
     template <typename T> void applyStyleProperties(float z, timestamp now);
     template <typename T> void applyStyleProperty(PropertyKey key, T &, float z, timestamp now);
+    template <typename T> void applyTransitionedStyleProperty(PropertyKey key, T &, float z, timestamp now);
 
     // Removes all expired style transitions.
     void cleanupAppliedStyleProperties(timestamp now);