[core] Introduce API to collect placed symbols data

The following methods are added to the `Renderer` class:
- `collectPlacedSymbolData()`
  enables or disables collecting of the placed symbols data

- `getPlacedSymbolsData()`
  if collecting of the placed symbols data is enabled, returns the
  reference to the `PlacedSymbolData` vector holding the collected data.

1 files changed, 3 insertions, 0 deletions

diff --git a/src/mbgl/renderer/render_orchestrator.hpp b/src/mbgl/renderer/render_orchestrator.hpp
index 19632c3218..08904e7e5a 100644
--- a/src/mbgl/renderer/render_orchestrator.hpp
+++ b/src/mbgl/renderer/render_orchestrator.hpp
@@ -72,6 +72,8 @@ public:
 
     void reduceMemoryUse();
     void dumpDebugLogs();
+    void collectPlacedSymbolData(bool);
+    const std::vector<PlacedSymbolData>& getPlacedSymbolsData() const;
     void clearData();
 
 private:
@@ -124,6 +126,7 @@ private:
 
     const bool backgroundLayerAsColor;
     bool contextLost = false;
+    bool placedSymbolDataCollected = false;
 
     // Vectors with reserved capacity of layerImpls->size() to avoid reallocation
     // on each frame.