[core] Added RendererState::has{Image,Layer,Source}

1 files changed, 9 insertions, 1 deletions

diff --git a/include/mbgl/renderer/renderer_state.hpp b/include/mbgl/renderer/renderer_state.hpp
index 1b300c190b..27985ae996 100644
--- a/include/mbgl/renderer/renderer_state.hpp
+++ b/include/mbgl/renderer/renderer_state.hpp
@@ -8,7 +8,7 @@ namespace mbgl {
 class UpdateParameters;
 
 /**
- * RendererState acts as a Memento-like object that is able to extract data out of UpdateParameters (an opaque object
+ * RendererState acts as a Memento object that is able to extract data out of UpdateParameters (an opaque object
  * from the public API perspective).
  */
 class RendererState {
@@ -17,6 +17,14 @@ public:
     // Obtains a CameraOptions out of a given UpdateParameters object.
     static CameraOptions getCameraOptions(UpdateParameters&, const EdgeInsets& = {});
 
+    // Returns whether an image with the given ID exists from a given UpdateParamters object.
+    static bool hasImage(UpdateParameters&, const std::string& id);
+
+    // Returns whether a layer with the given ID exists from a given UpdateParamters object.
+    static bool hasLayer(UpdateParameters&, const std::string& id);
+
+    // Returns whether a source with the given ID exists from a given UpdateParamters object.
+    static bool hasSource(UpdateParameters&, const std::string& id);
 };
 
 } // namespace mbgl