1 files changed, 82 insertions, 0 deletions
diff --git a/src/mbgl/text/placement.hpp b/src/mbgl/text/placement.hpp
new file mode 100644
index 0000000000..a50fc47125
--- /dev/null
+++ b/src/mbgl/text/placement.hpp
@@ -0,0 +1,82 @@
+#pragma once
+
+#include <string>
+#include <unordered_map>
+#include <mbgl/util/chrono.hpp>
+#include <mbgl/text/collision_index.hpp>
+#include <mbgl/layout/symbol_projection.hpp>
+#include <unordered_set>
+
+namespace mbgl {
+
+    class RenderSymbolLayer;
+    class SymbolBucket;
+
+    class OpacityState {
+        public:
+            OpacityState(bool placed);
+            OpacityState(const OpacityState& prevOpacityState, float increment, bool placed);
+            bool isHidden() const;
+            float opacity;
+            bool placed;
+    };
+
+    class JointOpacityState {
+        public:
+            JointOpacityState(bool placedIcon, bool placedText);
+            JointOpacityState(const JointOpacityState& prevOpacityState, float increment, bool placedIcon, bool placedText);
+            bool isHidden() const;
+            OpacityState icon;
+            OpacityState text;
+    };
+
+    class PlacementPair {
+        public:
+            PlacementPair(bool text_, bool icon_) : text(text_), icon(icon_) {}
+            bool text;
+            bool icon;
+    };
+
+    class Placement {
+        public:
+            Placement(const TransformState&, MapMode mapMode);
+            void placeLayer(RenderSymbolLayer&, const mat4&, bool showCollisionBoxes);
+            bool commit(const Placement& prevPlacement, TimePoint);
+            void updateLayerOpacities(RenderSymbolLayer&);
+            JointOpacityState getOpacity(uint32_t crossTileSymbolID) const;
+            float symbolFadeChange(TimePoint now) const;
+            bool hasTransitions(TimePoint now) const;
+
+            const CollisionIndex& getCollisionIndex() const;
+        
+            bool stillRecent(TimePoint now) const;
+            void setRecent(TimePoint now);
+            void setStale();
+        private:
+
+            void placeLayerBucket(
+                    SymbolBucket&,
+                    const mat4& posMatrix,
+                    const mat4& textLabelPlaneMatrix,
+                    const mat4& iconLabelPlaneMatrix,
+                    const float scale,
+                    const float pixelRatio,
+                    const bool showCollisionBoxes,
+                    std::unordered_set<uint32_t>& seenCrossTileIDs);
+
+            void updateBucketOpacities(SymbolBucket&, std::unordered_set<uint32_t>&);
+        
+            CollisionIndex collisionIndex;
+
+            TransformState state;
+            MapMode mapMode;
+            TimePoint commitTime;
+
+            std::unordered_map<uint32_t,PlacementPair> placements;
+            std::unordered_map<uint32_t,JointOpacityState> opacities;
+        
+            TimePoint recentUntil;
+            bool stale = false;
+    };
+
+} // namespace mbgl