1 files changed, 32 insertions, 0 deletions
diff --git a/src/mbgl/renderer/renderer_state.cpp b/src/mbgl/renderer/renderer_state.cpp
index dc5c4c1292..a024f37dfc 100644
--- a/src/mbgl/renderer/renderer_state.cpp
+++ b/src/mbgl/renderer/renderer_state.cpp
@@ -1,10 +1,42 @@
 #include <mbgl/renderer/renderer_state.hpp>
 #include <mbgl/renderer/update_parameters.hpp>
 
+#include <mbgl/style/image_impl.hpp>
+#include <mbgl/style/layer_impl.hpp>
+#include <mbgl/style/source_impl.hpp>
+
 namespace mbgl {
 
 CameraOptions RendererState::getCameraOptions(UpdateParameters& updateParameters, const EdgeInsets& padding) {
     return updateParameters.transformState.getCameraOptions(padding);
 }
 
+bool RendererState::hasImage(UpdateParameters& updateParameters, const std::string& id) {
+    for (const auto& image : *updateParameters.images) {
+        if (image.get()->id == id) {
+            return true;
+        }
+    }
+    return false;
+}
+
+bool RendererState::hasLayer(UpdateParameters& updateParameters, const std::string& id) {
+    for (const auto& layer : *updateParameters.layers) {
+        if (layer.get()->id == id) {
+            return true;
+        }
+    }
+    return false;
+}
+
+bool RendererState::hasSource(UpdateParameters& updateParameters, const std::string& id) {
+    for (const auto& source : *updateParameters.sources) {
+        if (source.get()->id == id) {
+            return true;
+        }
+    }
+    return false;
+}
+
+
 } // namespace mbgl