[core] Add onRemoveUnusedStyleImages observer API

1 files changed, 2 insertions, 0 deletions

diff --git a/src/mbgl/renderer/image_manager.hpp b/src/mbgl/renderer/image_manager.hpp
index 533259039f..f20d55415b 100644
--- a/src/mbgl/renderer/image_manager.hpp
+++ b/src/mbgl/renderer/image_manager.hpp
@@ -56,6 +56,7 @@ public:
     void removeRequestor(ImageRequestor&);
     void notifyIfMissingImageAdded();
     void reduceMemoryUse();
+    void reduceMemoryUseIfCacheSizeExceedsLimit();
 
     ImageVersionMap updatedImageVersions;
 
@@ -75,6 +76,7 @@ private:
     };
     std::map<ImageRequestor*, MissingImageRequestPair> missingImageRequestors;
     std::map<std::string, std::set<ImageRequestor*>> requestedImages;
+    std::size_t requestedImagesCacheSize = 0ul;
     ImageMap images;
 
     ImageManagerObserver* observer = nullptr;