[core] LayerManager can disable annotations

At the moment, the annotations implementation in the `mapbox-gl-native`
core is creating concrete layer instances apart from `LayerManager/LayerFactory`
code path.

So, annotations must be disabled if the `LayerManager` implementation does
not provide line, fill or symbol layers (those, used by the annotations).

Note: in future, annotations implementation will be moved from the core to the
platform SDK level(see https://github.com/mapbox/mapbox-plugins-android/tree/master/plugin-annotation)
and `LayerManager` won't need to disable it.

1 files changed, 4 insertions, 2 deletions

diff --git a/src/mbgl/renderer/renderer_impl.cpp b/src/mbgl/renderer/renderer_impl.cpp
index c4c4851345..7d1653cdbd 100644
--- a/src/mbgl/renderer/renderer_impl.cpp
+++ b/src/mbgl/renderer/renderer_impl.cpp
@@ -85,8 +85,9 @@ void Renderer::Impl::render(const UpdateParameters& updateParameters) {
     }
     
     assert(BackendScope::exists());
-    
-    updateParameters.annotationManager.updateData();
+    if (LayerManager::annotationsEnabled) {
+        updateParameters.annotationManager.updateData();
+    }
 
     const bool zoomChanged = zoomHistory.update(updateParameters.transformState.getZoom(), updateParameters.timePoint);
 
@@ -698,6 +699,7 @@ std::vector<Feature> Renderer::Impl::queryRenderedFeatures(const ScreenLineStrin
 }
 
 std::vector<Feature> Renderer::Impl::queryShapeAnnotations(const ScreenLineString& geometry) const {
+    assert(LayerManager::annotationsEnabled);
     std::vector<const RenderLayer*> shapeAnnotationLayers;
     RenderedQueryOptions options;
     for (const auto& layerImpl : *layerImpls) {