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Diffstat (limited to 'include/mbgl/style/layer.hpp')
| -rw-r--r-- | include/mbgl/style/layer.hpp | 22 |
1 files changed, 22 insertions, 0 deletions
diff --git a/include/mbgl/style/layer.hpp b/include/mbgl/style/layer.hpp index 9e73e994e6..d85f459815 100644 --- a/include/mbgl/style/layer.hpp +++ b/include/mbgl/style/layer.hpp @@ -152,6 +152,12 @@ protected: /** * @brief A singleton class responsible for creating layer instances. + * + * The LayerManager has implementation per platform. The LayerManager implementation + * defines what layer types are available and it can also disable annotations. + * + * Linker excludes the unreachable code for the disabled annotations and layers + * from the binaries, significantly reducing their size. */ class LayerManager { public: @@ -168,6 +174,22 @@ public: /// Returns a new RenderLayer instance on success call; returns `nulltptr` otherwise. std::unique_ptr<RenderLayer> createRenderLayer(Immutable<style::Layer::Impl>) noexcept; + /** + * @brief a build-time flag to enable/disable annotations in mapbox-gl-native core. + * + * At the moment, the annotations implementation in 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 + * implementation). + * + * Note: in future, annotations implemantation will be moved from the core to platform + * SDK (see https://github.com/mapbox/mapbox-plugins-android/tree/master/plugin-annotation) + * and this flag won't be needed any more. + */ + static const bool annotationsEnabled; + protected: virtual ~LayerManager() = default; virtual LayerFactory* getFactory(const std::string& type) noexcept = 0; |