[core] layermanager folder

Move `LayerManager` and `LayerFactory` abstract classes to a dedicated folder.

30 files changed, 204 insertions, 152 deletions

diff --git a/cmake/core-files.txt b/cmake/core-files.txt
index 2d55807ee8..bccdc27066 100644
--- a/cmake/core-files.txt
+++ b/cmake/core-files.txt
@@ -94,6 +94,12 @@ src/mbgl/gl/vertex_array.hpp
 src/mbgl/gl/vertex_array_extension.hpp
 src/mbgl/gl/vertex_buffer.hpp
 
+# layermanager
+include/mbgl/layermanager/layer_factory.hpp
+include/mbgl/layermanager/layer_manager.hpp
+src/mbgl/layermanager/layer_factory.cpp
+src/mbgl/layermanager/layer_manager.cpp
+
 # layout
 src/mbgl/layout/clip_lines.cpp
 src/mbgl/layout/clip_lines.hpp
diff --git a/include/mbgl/layermanager/layer_factory.hpp b/include/mbgl/layermanager/layer_factory.hpp
new file mode 100644
index 0000000000..3e2b2c3ddd
--- /dev/null
+++ b/include/mbgl/layermanager/layer_factory.hpp
@@ -0,0 +1,29 @@
+#pragma once
+
+#include <mbgl/style/layer.hpp>
+
+namespace mbgl {
+
+class RenderLayer;
+
+/**
+ * @brief The LayerFactory abstract class
+ * 
+ * This class is responsible for creation of the layer objects that belong to a concrete layer type.
+ */
+class LayerFactory {
+public:
+    virtual ~LayerFactory() = default;
+    /// Returns the layer type data.
+    virtual const style::LayerTypeInfo* getTypeInfo() const noexcept = 0;
+    /// Returns a new Layer instance on success call; returns `nulltptr` otherwise. 
+    virtual std::unique_ptr<style::Layer> createLayer(const std::string& id, const style::conversion::Convertible& value) noexcept = 0;
+    /// Returns a new RenderLayer instance on success call; returns `nulltptr` otherwise.
+    virtual std::unique_ptr<RenderLayer> createRenderLayer(Immutable<style::Layer::Impl>) noexcept = 0;
+
+protected:
+    optional<std::string> getSource(const style::conversion::Convertible& value) const noexcept;
+    bool initSourceLayerAndFilter(style::Layer*, const style::conversion::Convertible& value) const noexcept;
+};
+
+} // namespace mbgl
diff --git a/include/mbgl/layermanager/layer_manager.hpp b/include/mbgl/layermanager/layer_manager.hpp
new file mode 100644
index 0000000000..038a6dcb04
--- /dev/null
+++ b/include/mbgl/layermanager/layer_manager.hpp
@@ -0,0 +1,56 @@
+#pragma once
+
+#include <mbgl/style/layer.hpp>
+
+namespace mbgl {
+
+class LayerFactory;
+class RenderLayer;
+
+/**
+ * @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:
+    /**
+     * @brief A singleton getter.
+     * 
+     * @return LayerManager* 
+     */
+    static LayerManager* get() noexcept;
+
+    /// Returns a new Layer instance on success call; returns `nulltptr` otherwise.
+    std::unique_ptr<style::Layer> createLayer(const std::string& type, const std::string& id,
+                                              const style::conversion::Convertible& value, style::conversion::Error& error) noexcept;
+    /// 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;
+    virtual LayerFactory* getFactory(const style::LayerTypeInfo*) noexcept = 0;
+};
+
+} // namespace mbgl
diff --git a/include/mbgl/style/layer.hpp b/include/mbgl/style/layer.hpp
index d85f459815..bd0905cd6d 100644
--- a/include/mbgl/style/layer.hpp
+++ b/include/mbgl/style/layer.hpp
@@ -126,74 +126,4 @@ protected:
 };
 
 } // namespace style
-
-class RenderLayer;
-// TODO: The following classes shall not be here. Move layer factories and manager to a dedicated folder.
-
-/**
- * @brief The LayerFactory abstract class
- * 
- * This class is responsible for creation of the layer objects that belong to a concrete layer type.
- */
-class LayerFactory {
-public:
-    virtual ~LayerFactory() = default;
-    /// Returns the layer type data.
-    virtual const style::LayerTypeInfo* getTypeInfo() const noexcept = 0;
-    /// Returns a new Layer instance on success call; returns `nulltptr` otherwise. 
-    virtual std::unique_ptr<style::Layer> createLayer(const std::string& id, const style::conversion::Convertible& value) noexcept = 0;
-    /// Returns a new RenderLayer instance on success call; returns `nulltptr` otherwise.
-    virtual std::unique_ptr<RenderLayer> createRenderLayer(Immutable<style::Layer::Impl>) noexcept = 0;
-
-protected:
-    optional<std::string> getSource(const style::conversion::Convertible& value) const noexcept;
-    bool initSourceLayerAndFilter(style::Layer*, const style::conversion::Convertible& value) const noexcept;
-};
-
-/**
- * @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:
-    /**
-     * @brief A singleton getter.
-     * 
-     * @return LayerManager* 
-     */
-    static LayerManager* get() noexcept;
-
-    /// Returns a new Layer instance on success call; returns `nulltptr` otherwise.
-    std::unique_ptr<style::Layer> createLayer(const std::string& type, const std::string& id,
-                                              const style::conversion::Convertible& value, style::conversion::Error& error) noexcept;
-    /// 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;
-    virtual LayerFactory* getFactory(const style::LayerTypeInfo*) noexcept = 0;
-};
-
 } // namespace mbgl
diff --git a/include/mbgl/style/layers/background_layer.hpp b/include/mbgl/style/layers/background_layer.hpp
index b471d8613e..e501954620 100644
--- a/include/mbgl/style/layers/background_layer.hpp
+++ b/include/mbgl/style/layers/background_layer.hpp
@@ -2,11 +2,11 @@
 
 #pragma once
 
+#include <mbgl/layermanager/layer_factory.hpp>
 #include <mbgl/style/layer.hpp>
 #include <mbgl/style/filter.hpp>
 #include <mbgl/style/property_value.hpp>
 #include <mbgl/style/expression/formatted.hpp>
-
 #include <mbgl/util/color.hpp>
 
 namespace mbgl {
diff --git a/include/mbgl/style/layers/circle_layer.hpp b/include/mbgl/style/layers/circle_layer.hpp
index 46951653b7..6d8969e834 100644
--- a/include/mbgl/style/layers/circle_layer.hpp
+++ b/include/mbgl/style/layers/circle_layer.hpp
@@ -2,11 +2,11 @@
 
 #pragma once
 
+#include <mbgl/layermanager/layer_factory.hpp>
 #include <mbgl/style/layer.hpp>
 #include <mbgl/style/filter.hpp>
 #include <mbgl/style/property_value.hpp>
 #include <mbgl/style/expression/formatted.hpp>
-
 #include <mbgl/util/color.hpp>
 
 namespace mbgl {
diff --git a/include/mbgl/style/layers/custom_layer.hpp b/include/mbgl/style/layers/custom_layer.hpp
index d204a782f2..27c16fbbc5 100644
--- a/include/mbgl/style/layers/custom_layer.hpp
+++ b/include/mbgl/style/layers/custom_layer.hpp
@@ -1,5 +1,6 @@
 #pragma once
 
+#include <mbgl/layermanager/layer_factory.hpp>
 #include <mbgl/style/layer.hpp>
 
 #include <array>
diff --git a/include/mbgl/style/layers/fill_extrusion_layer.hpp b/include/mbgl/style/layers/fill_extrusion_layer.hpp
index dec1628bb3..fd0888c1eb 100644
--- a/include/mbgl/style/layers/fill_extrusion_layer.hpp
+++ b/include/mbgl/style/layers/fill_extrusion_layer.hpp
@@ -2,11 +2,11 @@
 
 #pragma once
 
+#include <mbgl/layermanager/layer_factory.hpp>
 #include <mbgl/style/layer.hpp>
 #include <mbgl/style/filter.hpp>
 #include <mbgl/style/property_value.hpp>
 #include <mbgl/style/expression/formatted.hpp>
-
 #include <mbgl/util/color.hpp>
 
 namespace mbgl {
diff --git a/include/mbgl/style/layers/fill_layer.hpp b/include/mbgl/style/layers/fill_layer.hpp
index 222142daf3..6c235b6ab7 100644
--- a/include/mbgl/style/layers/fill_layer.hpp
+++ b/include/mbgl/style/layers/fill_layer.hpp
@@ -2,11 +2,11 @@
 
 #pragma once
 
+#include <mbgl/layermanager/layer_factory.hpp>
 #include <mbgl/style/layer.hpp>
 #include <mbgl/style/filter.hpp>
 #include <mbgl/style/property_value.hpp>
 #include <mbgl/style/expression/formatted.hpp>
-
 #include <mbgl/util/color.hpp>
 
 namespace mbgl {
diff --git a/include/mbgl/style/layers/heatmap_layer.hpp b/include/mbgl/style/layers/heatmap_layer.hpp
index 004d77c487..6ff377cf8f 100644
--- a/include/mbgl/style/layers/heatmap_layer.hpp
+++ b/include/mbgl/style/layers/heatmap_layer.hpp
@@ -2,12 +2,12 @@
 
 #pragma once
 
+#include <mbgl/layermanager/layer_factory.hpp>
 #include <mbgl/style/color_ramp_property_value.hpp>
 #include <mbgl/style/layer.hpp>
 #include <mbgl/style/filter.hpp>
 #include <mbgl/style/property_value.hpp>
 #include <mbgl/style/expression/formatted.hpp>
-
 #include <mbgl/util/color.hpp>
 
 namespace mbgl {
diff --git a/include/mbgl/style/layers/hillshade_layer.hpp b/include/mbgl/style/layers/hillshade_layer.hpp
index f840386907..0c1843af75 100644
--- a/include/mbgl/style/layers/hillshade_layer.hpp
+++ b/include/mbgl/style/layers/hillshade_layer.hpp
@@ -2,11 +2,11 @@
 
 #pragma once
 
+#include <mbgl/layermanager/layer_factory.hpp>
 #include <mbgl/style/layer.hpp>
 #include <mbgl/style/filter.hpp>
 #include <mbgl/style/property_value.hpp>
 #include <mbgl/style/expression/formatted.hpp>
-
 #include <mbgl/util/color.hpp>
 
 namespace mbgl {
diff --git a/include/mbgl/style/layers/layer.hpp.ejs b/include/mbgl/style/layers/layer.hpp.ejs
index 84a8edd9de..e4c9d69dbf 100644
--- a/include/mbgl/style/layers/layer.hpp.ejs
+++ b/include/mbgl/style/layers/layer.hpp.ejs
@@ -7,6 +7,7 @@
 
 #pragma once
 
+#include <mbgl/layermanager/layer_factory.hpp>
 <% if (type === 'heatmap' || type === 'line') { -%>
 #include <mbgl/style/color_ramp_property_value.hpp>
 <% } -%>
@@ -14,7 +15,6 @@
 #include <mbgl/style/filter.hpp>
 #include <mbgl/style/property_value.hpp>
 #include <mbgl/style/expression/formatted.hpp>
-
 #include <mbgl/util/color.hpp>
 
 <% if (type === 'line' || type === 'symbol') { -%>
diff --git a/include/mbgl/style/layers/line_layer.hpp b/include/mbgl/style/layers/line_layer.hpp
index bbc0213c53..083bac6b9c 100644
--- a/include/mbgl/style/layers/line_layer.hpp
+++ b/include/mbgl/style/layers/line_layer.hpp
@@ -2,12 +2,12 @@
 
 #pragma once
 
+#include <mbgl/layermanager/layer_factory.hpp>
 #include <mbgl/style/color_ramp_property_value.hpp>
 #include <mbgl/style/layer.hpp>
 #include <mbgl/style/filter.hpp>
 #include <mbgl/style/property_value.hpp>
 #include <mbgl/style/expression/formatted.hpp>
-
 #include <mbgl/util/color.hpp>
 
 #include <vector>
diff --git a/include/mbgl/style/layers/raster_layer.hpp b/include/mbgl/style/layers/raster_layer.hpp
index 0def2faacd..ef84ee569a 100644
--- a/include/mbgl/style/layers/raster_layer.hpp
+++ b/include/mbgl/style/layers/raster_layer.hpp
@@ -2,11 +2,11 @@
 
 #pragma once
 
+#include <mbgl/layermanager/layer_factory.hpp>
 #include <mbgl/style/layer.hpp>
 #include <mbgl/style/filter.hpp>
 #include <mbgl/style/property_value.hpp>
 #include <mbgl/style/expression/formatted.hpp>
-
 #include <mbgl/util/color.hpp>
 
 namespace mbgl {
diff --git a/include/mbgl/style/layers/symbol_layer.hpp b/include/mbgl/style/layers/symbol_layer.hpp
index e17df295f3..3d23120559 100644
--- a/include/mbgl/style/layers/symbol_layer.hpp
+++ b/include/mbgl/style/layers/symbol_layer.hpp
@@ -2,11 +2,11 @@
 
 #pragma once
 
+#include <mbgl/layermanager/layer_factory.hpp>
 #include <mbgl/style/layer.hpp>
 #include <mbgl/style/filter.hpp>
 #include <mbgl/style/property_value.hpp>
 #include <mbgl/style/expression/formatted.hpp>
-
 #include <mbgl/util/color.hpp>
 
 #include <vector>
diff --git a/platform/android/src/style/layers/layer.hpp b/platform/android/src/style/layers/layer.hpp
index c405bc17c1..0fb679152b 100644
--- a/platform/android/src/style/layers/layer.hpp
+++ b/platform/android/src/style/layers/layer.hpp
@@ -1,5 +1,6 @@
 #pragma once
 
+#include <mbgl/layermanager/layer_factory.hpp>
 #include <mbgl/map/map.hpp>
 #include <mbgl/style/layer.hpp>
 #include "../../gson/json_array.hpp"
diff --git a/platform/android/src/style/layers/layer_manager.hpp b/platform/android/src/style/layers/layer_manager.hpp
index 1521645cce..ff7e48027e 100644
--- a/platform/android/src/style/layers/layer_manager.hpp
+++ b/platform/android/src/style/layers/layer_manager.hpp
@@ -1,10 +1,9 @@
 #pragma once
 
+#include <mbgl/layermanager/layer_manager.hpp>
 #include <mbgl/map/map.hpp>
 #include <mbgl/style/layer.hpp>
 
-#include <mbgl/renderer/render_layer.hpp>
-
 #include "layer.hpp"
 
 #include <jni/jni.hpp>
diff --git a/platform/darwin/src/MGLStyleLayerManager.h b/platform/darwin/src/MGLStyleLayerManager.h
index 2fa34991a1..cdd30f4fff 100644
--- a/platform/darwin/src/MGLStyleLayerManager.h
+++ b/platform/darwin/src/MGLStyleLayerManager.h
@@ -2,6 +2,7 @@
 
 #import "MGLStyleLayer_Private.h"
 
+#include <mbgl/layermanager/layer_manager.hpp>
 #include <mbgl/style/layer.hpp>
 
 #include <map>
diff --git a/platform/darwin/src/MGLStyleLayer_Private.h b/platform/darwin/src/MGLStyleLayer_Private.h
index 656f74ca42..314f61f680 100644
--- a/platform/darwin/src/MGLStyleLayer_Private.h
+++ b/platform/darwin/src/MGLStyleLayer_Private.h
@@ -3,6 +3,7 @@
 #import "MGLStyleLayer.h"
 #import "MGLStyleValue_Private.h"
 
+#include <mbgl/layermanager/layer_factory.hpp>
 #include <mbgl/style/layer.hpp>
 
 NS_ASSUME_NONNULL_BEGIN
diff --git a/platform/default/layer_manager.cpp b/platform/default/layer_manager.cpp
index 32d5cbc0fc..86343369b4 100644
--- a/platform/default/layer_manager.cpp
+++ b/platform/default/layer_manager.cpp
@@ -1,14 +1,14 @@
-#include <mbgl/renderer/render_layer.hpp>
-#include <mbgl/renderer/layers/render_background_layer.hpp>
-#include <mbgl/renderer/layers/render_circle_layer.hpp>
-#include <mbgl/renderer/layers/render_custom_layer.hpp>
-#include <mbgl/renderer/layers/render_fill_extrusion_layer.hpp>
-#include <mbgl/renderer/layers/render_fill_layer.hpp>
-#include <mbgl/renderer/layers/render_hillshade_layer.hpp>
-#include <mbgl/renderer/layers/render_line_layer.hpp>
-#include <mbgl/renderer/layers/render_raster_layer.hpp>
-#include <mbgl/renderer/layers/render_symbol_layer.hpp>
-#include <mbgl/renderer/layers/render_heatmap_layer.hpp>
+#include <mbgl/layermanager/layer_manager.hpp>
+#include <mbgl/style/layers/background_layer.hpp>
+#include <mbgl/style/layers/circle_layer.hpp>
+#include <mbgl/style/layers/custom_layer.hpp>
+#include <mbgl/style/layers/fill_extrusion_layer.hpp>
+#include <mbgl/style/layers/fill_layer.hpp>
+#include <mbgl/style/layers/heatmap_layer.hpp>
+#include <mbgl/style/layers/hillshade_layer.hpp>
+#include <mbgl/style/layers/line_layer.hpp>
+#include <mbgl/style/layers/raster_layer.hpp>
+#include <mbgl/style/layers/symbol_layer.hpp>
 
 #include <map>
 #include <memory>
diff --git a/src/mbgl/annotation/annotation_manager.cpp b/src/mbgl/annotation/annotation_manager.cpp
index 17cf77865c..ab22404c15 100644
--- a/src/mbgl/annotation/annotation_manager.cpp
+++ b/src/mbgl/annotation/annotation_manager.cpp
@@ -4,6 +4,7 @@
 #include <mbgl/annotation/symbol_annotation_impl.hpp>
 #include <mbgl/annotation/line_annotation_impl.hpp>
 #include <mbgl/annotation/fill_annotation_impl.hpp>
+#include <mbgl/layermanager/layer_manager.hpp>
 #include <mbgl/style/style.hpp>
 #include <mbgl/style/style_impl.hpp>
 #include <mbgl/style/layers/symbol_layer.hpp>
diff --git a/src/mbgl/layermanager/layer_factory.cpp b/src/mbgl/layermanager/layer_factory.cpp
new file mode 100644
index 0000000000..c7f63b8699
--- /dev/null
+++ b/src/mbgl/layermanager/layer_factory.cpp
@@ -0,0 +1,47 @@
+#include <mbgl/layermanager/layer_factory.hpp>
+
+#include <mbgl/style/conversion/constant.hpp>
+#include <mbgl/style/conversion/filter.hpp>
+#include <mbgl/style/conversion_impl.hpp>
+#include <mbgl/style/layer.hpp>
+
+namespace mbgl {
+
+optional<std::string> LayerFactory::getSource(const style::conversion::Convertible& value) const noexcept {
+    auto sourceValue = objectMember(value, "source");
+    if (!sourceValue) {
+        return nullopt;
+    }
+
+    optional<std::string> source = toString(*sourceValue);
+    if (!source) {
+        return nullopt;
+    }
+
+    return source;
+}
+
+bool LayerFactory::initSourceLayerAndFilter(style::Layer* layer, const style::conversion::Convertible& value) const noexcept {
+    auto sourceLayerValue = objectMember(value, "source-layer");
+    if (sourceLayerValue) {
+        optional<std::string> sourceLayer = toString(*sourceLayerValue);
+        if (!sourceLayer) {
+            return false;
+        }
+        layer->setSourceLayer(*sourceLayer);
+    }
+
+    auto filterValue = objectMember(value, "filter");
+    if (filterValue) {
+        style::conversion::Error error;
+        optional<style::Filter> filter = style::conversion::convert<style::Filter>(*filterValue, error);
+        if (!filter) {
+            return false;
+        }
+        layer->setFilter(*filter);
+    }
+
+    return true;
+}
+
+} // namespace mbgl
diff --git a/src/mbgl/layermanager/layer_manager.cpp b/src/mbgl/layermanager/layer_manager.cpp
new file mode 100644
index 0000000000..8f42bc9218
--- /dev/null
+++ b/src/mbgl/layermanager/layer_manager.cpp
@@ -0,0 +1,31 @@
+#include <mbgl/layermanager/layer_manager.hpp>
+
+#include <mbgl/layermanager/layer_factory.hpp>
+#include <mbgl/renderer/render_layer.hpp>
+#include <mbgl/style/layer.hpp>
+#include <mbgl/style/layer_impl.hpp>
+#include <mbgl/style/conversion_impl.hpp>
+
+namespace mbgl {
+
+std::unique_ptr<style::Layer> LayerManager::createLayer(
+    const std::string& type, const std::string& id,
+    const style::conversion::Convertible& value, style::conversion::Error& error) noexcept {
+    if (LayerFactory* factory = getFactory(type)) {
+        auto layer = factory->createLayer(id, value);
+        if (!layer) {
+            error.message = "Error parsing a layer of type: " + type;
+        }
+        return layer;
+    }
+    error.message = "Unsupported layer type: " + type;
+    return nullptr;
+}
+
+std::unique_ptr<RenderLayer> LayerManager::createRenderLayer(Immutable<style::Layer::Impl> impl) noexcept {
+    LayerFactory* factory = getFactory(impl->getTypeInfo());
+    assert(factory);
+    return factory->createRenderLayer(std::move(impl));
+}
+
+} // namespace mbgl
diff --git a/src/mbgl/map/map.cpp b/src/mbgl/map/map.cpp
index b8d5186729..c3bebae837 100644
--- a/src/mbgl/map/map.cpp
+++ b/src/mbgl/map/map.cpp
@@ -3,6 +3,7 @@
 #include <mbgl/map/transform.hpp>
 #include <mbgl/map/transform_state.hpp>
 #include <mbgl/annotation/annotation_manager.hpp>
+#include <mbgl/layermanager/layer_manager.hpp>
 #include <mbgl/style/style_impl.hpp>
 #include <mbgl/style/observer.hpp>
 #include <mbgl/renderer/update_parameters.hpp>
diff --git a/src/mbgl/renderer/renderer.cpp b/src/mbgl/renderer/renderer.cpp
index 9976c1b6dc..6b73e568fc 100644
--- a/src/mbgl/renderer/renderer.cpp
+++ b/src/mbgl/renderer/renderer.cpp
@@ -1,4 +1,6 @@
 #include <mbgl/renderer/renderer.hpp>
+
+#include <mbgl/layermanager/layer_manager.hpp>
 #include <mbgl/renderer/renderer_impl.hpp>
 #include <mbgl/renderer/backend_scope.hpp>
 #include <mbgl/annotation/annotation_manager.hpp>
diff --git a/src/mbgl/renderer/renderer_impl.cpp b/src/mbgl/renderer/renderer_impl.cpp
index 7d1653cdbd..c844d1f87c 100644
--- a/src/mbgl/renderer/renderer_impl.cpp
+++ b/src/mbgl/renderer/renderer_impl.cpp
@@ -1,4 +1,5 @@
 #include <mbgl/annotation/annotation_manager.hpp>
+#include <mbgl/layermanager/layer_manager.hpp>
 #include <mbgl/renderer/renderer_impl.hpp>
 #include <mbgl/renderer/renderer_backend.hpp>
 #include <mbgl/renderer/renderer_observer.hpp>
diff --git a/src/mbgl/style/conversion/layer.cpp b/src/mbgl/style/conversion/layer.cpp
index b551f1bfb2..e8f94a1064 100644
--- a/src/mbgl/style/conversion/layer.cpp
+++ b/src/mbgl/style/conversion/layer.cpp
@@ -3,6 +3,8 @@
 #include <mbgl/style/conversion/filter.hpp>
 #include <mbgl/style/conversion_impl.hpp>
 
+#include <mbgl/layermanager/layer_manager.hpp>
+
 namespace mbgl {
 namespace style {
 namespace conversion {
diff --git a/src/mbgl/style/layer.cpp b/src/mbgl/style/layer.cpp
index abe6444701..328cd47555 100644
--- a/src/mbgl/style/layer.cpp
+++ b/src/mbgl/style/layer.cpp
@@ -110,63 +110,4 @@ const LayerTypeInfo* Layer::getTypeInfo() const noexcept {
 }
 
 } // namespace style
-
-optional<std::string> LayerFactory::getSource(const style::conversion::Convertible& value) const noexcept {
-    auto sourceValue = objectMember(value, "source");
-    if (!sourceValue) {
-        return nullopt;
-    }
-
-    optional<std::string> source = toString(*sourceValue);
-    if (!source) {
-        return nullopt;
-    }
-
-    return source;
-}
-
-bool LayerFactory::initSourceLayerAndFilter(style::Layer* layer, const style::conversion::Convertible& value) const noexcept {
-    auto sourceLayerValue = objectMember(value, "source-layer");
-    if (sourceLayerValue) {
-        optional<std::string> sourceLayer = toString(*sourceLayerValue);
-        if (!sourceLayer) {
-            return false;
-        }
-        layer->setSourceLayer(*sourceLayer);
-    }
-
-    auto filterValue = objectMember(value, "filter");
-    if (filterValue) {
-        style::conversion::Error error;
-        optional<style::Filter> filter = style::conversion::convert<style::Filter>(*filterValue, error);
-        if (!filter) {
-            return false;
-        }
-        layer->setFilter(*filter);
-    }
-
-    return true;
-}
-
-std::unique_ptr<style::Layer> LayerManager::createLayer(
-    const std::string& type, const std::string& id,
-    const style::conversion::Convertible& value, style::conversion::Error& error) noexcept {
-    if (LayerFactory* factory = getFactory(type)) {
-        auto layer = factory->createLayer(id, value);
-        if (!layer) {
-            error.message = "Error parsing a layer of type: " + type;
-        }
-        return layer;
-    }
-    error.message = "Unsupported layer type: " + type;
-    return nullptr;
-}
-
-std::unique_ptr<RenderLayer> LayerManager::createRenderLayer(Immutable<style::Layer::Impl> impl) noexcept {
-    LayerFactory* factory = getFactory(impl->getTypeInfo());
-    assert(factory);
-    return factory->createRenderLayer(std::move(impl));
-}
-
-
 } // namespace mbgl
diff --git a/src/mbgl/tile/geometry_tile_worker.cpp b/src/mbgl/tile/geometry_tile_worker.cpp
index 9e4c045ce5..854bfcf1a4 100644
--- a/src/mbgl/tile/geometry_tile_worker.cpp
+++ b/src/mbgl/tile/geometry_tile_worker.cpp
@@ -1,6 +1,7 @@
 #include <mbgl/tile/geometry_tile_worker.hpp>
 #include <mbgl/tile/geometry_tile_data.hpp>
 #include <mbgl/tile/geometry_tile.hpp>
+#include <mbgl/layermanager/layer_manager.hpp>
 #include <mbgl/layout/symbol_layout.hpp>
 #include <mbgl/layout/pattern_layout.hpp>
 #include <mbgl/renderer/bucket_parameters.hpp>
diff --git a/test/renderer/group_by_layout.test.cpp b/test/renderer/group_by_layout.test.cpp
index deaa30b9f4..d1a7a0bf5f 100644
--- a/test/renderer/group_by_layout.test.cpp
+++ b/test/renderer/group_by_layout.test.cpp
@@ -1,5 +1,6 @@
 #include <mbgl/test/util.hpp>
 
+#include <mbgl/layermanager/layer_manager.hpp>
 #include <mbgl/renderer/group_by_layout.hpp>
 #include <mbgl/renderer/render_layer.hpp>
 #include <mbgl/style/layers/background_layer.hpp>