use pimpl for collision in tile_parser

include/mbgl/map/tile_parser.hpp

@@ -4,7 +4,6 @@
 #include <mbgl/map/vector_tile.hpp>
 #include <mbgl/style/filter_expression.hpp>
 #include <mbgl/text/glyph.hpp>
-#include <mbgl/text/collision.hpp>
 
 #include <cstdint>
 #include <iosfwd>
@@ -28,6 +27,7 @@ class StyleBucketLine;
 class StyleBucketSymbol;
 class StyleLayerGroup;
 class VectorTileData;
+class Collision;
 
 class TileParser {
 public:
@@ -37,6 +37,7 @@ public:
                const std::shared_ptr<GlyphStore> &glyphStore,
                const std::shared_ptr<SpriteAtlas> &spriteAtlas,
                const std::shared_ptr<Sprite> &sprite);
+    ~TileParser();
 
 public:
     void parse();
@@ -65,7 +66,7 @@ private:
     std::shared_ptr<Sprite> sprite;
     std::shared_ptr<Texturepool> texturePool;
 
-    Collision collision;
+    std::unique_ptr<Collision> collision;
 };
 
 }

include/mbgl/text/collision.hpp

@@ -29,7 +29,6 @@ class Collision {
 
 public:
     Collision(float zoom, float tileExtent, float tileSize, float placementDepth = 1);
-    ~Collision();
 
     float getPlacementScale(const GlyphBoxes &glyphs, float minPlacementScale, bool avoidEdges);
     PlacementRange getPlacementRange(const GlyphBoxes &glyphs, float placementScale,
@@ -38,8 +37,8 @@ public:
                 const PlacementRange &placementRange, bool horizontal);
 
 private:
-    void *hTree;
-    void *cTree;
+    Tree hTree;
+    Tree cTree;
     PlacementValue leftEdge;
     PlacementValue topEdge;
     PlacementValue rightEdge;