1 files changed, 70 insertions, 0 deletions
diff --git a/src/mbgl/renderer/placement_state.hpp b/src/mbgl/renderer/placement_state.hpp
new file mode 100644
index 0000000000..07c655ca03
--- /dev/null
+++ b/src/mbgl/renderer/placement_state.hpp
@@ -0,0 +1,70 @@
+#pragma once
+
+#include <mbgl/map/transform_state.hpp>
+#include <mbgl/style/collection.hpp>
+#include <mbgl/style/layer.hpp>
+#include <mbgl/tile/tile_id.hpp>
+#include <mbgl/util/chrono.hpp>
+#include <mbgl/util/optional.hpp>
+
+#include <functional>
+#include <map>
+#include <string>
+
+namespace mbgl {
+
+// TODO: Placeholder
+class CollisionIndex {
+public:
+    CollisionIndex(const TransformState&) {}
+};
+
+class RenderLayer;
+class RenderSymbolLayer;
+class RenderSource;
+
+struct CollisionFadeTimes {
+    TimePoint latestStart;
+    Duration fadeDuration;
+};
+
+class LayerPlacementState {
+public:
+    LayerPlacementState();
+    bool continuePlacement(RenderSymbolLayer& renderLayer,
+                           CollisionIndex& collisionIndex,
+                           const bool showCollisionBoxes,
+                           std::function<bool()> shouldPausePlacement);
+
+private:
+    size_t currentTileIndex;
+};
+
+class PlacementState
+{
+public:
+    PlacementState(const TransformState& transformState,
+                   const std::vector<RenderLayer>& order,
+                   const bool forceFullPlacement,
+                   const bool showCollisionBoxes,
+                   Duration fadeDuration,
+                   optional<PlacementState>& previousPlacement);
+    
+    bool isDone() const { return done; }
+    bool stillFading() const;
+    
+    void continuePlacement(std::vector<RenderLayer>& order, std::vector<RenderSource>& sources);
+    
+private:
+    CollisionIndex collisionIndex;
+    bool done;
+    size_t currentLayerIndex;
+    bool forceFullPlacement;
+    bool showCollisionBoxes;
+    TimePoint delayUntil;
+    CollisionFadeTimes collisionFadeTimes;
+    optional<LayerPlacementState> inProgressLayer;
+    
+};
+
+}; // mbgl