From 31f0f47195ae7d4a6f96b1c64cd39e1268fdfc8d Mon Sep 17 00:00:00 2001
From: Chris Loer <chris.loer@gmail.com>
Date: Thu, 9 Nov 2017 13:24:25 -0800
Subject: [core] Add CrossTileSymbolIndex. This class is responsible for
 tracking which symbols are "the same" between tiles at different zoom levels,
 so that symbol opacities (fade animations) can be copied smoothly between
 tiles.

---
 src/mbgl/text/cross_tile_symbol_index.hpp | 67 +++++++++++++++++++++++++++++++
 1 file changed, 67 insertions(+)
 create mode 100644 src/mbgl/text/cross_tile_symbol_index.hpp

(limited to 'src/mbgl/text/cross_tile_symbol_index.hpp')

diff --git a/src/mbgl/text/cross_tile_symbol_index.hpp b/src/mbgl/text/cross_tile_symbol_index.hpp
new file mode 100644
index 0000000000..0b8c5c4780
--- /dev/null
+++ b/src/mbgl/text/cross_tile_symbol_index.hpp
@@ -0,0 +1,67 @@
+#pragma once
+
+#include <mbgl/tile/tile_id.hpp>
+#include <mbgl/util/geometry.hpp>
+#include <mbgl/util/constants.hpp>
+#include <mbgl/util/optional.hpp>
+
+#include <map>
+#include <vector>
+#include <string>
+#include <memory>
+#include <unordered_set>
+
+namespace mbgl {
+
+class SymbolInstance;
+class RenderSymbolLayer;
+class SymbolBucket;
+
+class IndexEntry {
+    Point<float> anchorPoint;
+
+};
+
+class IndexedSymbolInstance {
+    public:
+        IndexedSymbolInstance(uint32_t crossTileID_, Point<int64_t> coord_)
+            : crossTileID(crossTileID_), coord(coord_) {};
+        uint32_t crossTileID;
+        Point<int64_t> coord;
+};
+
+class TileLayerIndex {
+    public:
+        TileLayerIndex(OverscaledTileID coord, std::vector<SymbolInstance>&, uint32_t bucketInstanceId);
+
+        Point<int64_t> getScaledCoordinates(SymbolInstance&, const OverscaledTileID&);
+        void findMatches(std::vector<SymbolInstance>&, const OverscaledTileID&);
+        
+        OverscaledTileID coord;
+        uint32_t bucketInstanceId;
+        std::map<std::u16string,std::vector<IndexedSymbolInstance>> indexedSymbolInstances;
+};
+
+class CrossTileSymbolLayerIndex {
+    public:
+        CrossTileSymbolLayerIndex();
+        void addBucket(const OverscaledTileID&, SymbolBucket&);
+        bool removeStaleBuckets(const std::unordered_set<uint32_t>& currentIDs);
+    private:
+        std::map<uint8_t,std::map<OverscaledTileID,TileLayerIndex>> indexes;
+        uint32_t maxBucketInstanceId = 0;
+        static uint32_t maxCrossTileID;
+};
+
+class CrossTileSymbolIndex {
+    public:
+        CrossTileSymbolIndex();
+
+        bool addLayer(RenderSymbolLayer&);
+    
+        void reset();
+    private:
+        std::map<std::string,CrossTileSymbolLayerIndex> layerIndexes;
+};
+
+} // namespace mbgl
-- 
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