[core] Monitor annotation tiles, rather than completely invalidating them

Fixes #1688

1 files changed, 13 insertions, 1 deletions

diff --git a/src/mbgl/annotation/annotation_manager.cpp b/src/mbgl/annotation/annotation_manager.cpp
index e5c55c90dd..7169d51622 100644
--- a/src/mbgl/annotation/annotation_manager.cpp
+++ b/src/mbgl/annotation/annotation_manager.cpp
@@ -138,7 +138,19 @@ void AnnotationManager::updateStyle(Style& style) {
     }
 
     obsoleteShapeAnnotationLayers.clear();
-    style.getSource(SourceID)->invalidateTiles();
+
+    for (auto& monitor : monitors) {
+        monitor->update(getTile(monitor->tileID));
+    }
+}
+
+void AnnotationManager::addTileMonitor(AnnotationTileMonitor& monitor) {
+    monitors.insert(&monitor);
+    monitor.update(getTile(monitor.tileID));
+}
+
+void AnnotationManager::removeTileMonitor(AnnotationTileMonitor& monitor) {
+    monitors.erase(&monitor);
 }
 
 }