1 files changed, 63 insertions, 0 deletions
diff --git a/src/mbgl/layout/symbol_projection.hpp b/src/mbgl/layout/symbol_projection.hpp
new file mode 100644
index 0000000000..3e57d162fd
--- /dev/null
+++ b/src/mbgl/layout/symbol_projection.hpp
@@ -0,0 +1,63 @@
+#pragma once
+
+#include <mbgl/util/mat4.hpp>
+#include <mbgl/gl/vertex_buffer.hpp>
+#include <mbgl/programs/symbol_program.hpp>
+
+namespace mbgl {
+
+    class TransformState;
+    class RenderTile;
+    class SymbolSizeBinder;
+    class PlacedSymbol;
+    namespace style {
+        class SymbolPropertyValues;
+    } // end namespace style
+    
+    struct TileDistance {
+        TileDistance(float prevTileDistance_, float lastSegmentViewportDistance_)
+            : prevTileDistance(prevTileDistance_), lastSegmentViewportDistance(lastSegmentViewportDistance_)
+        {}
+        float prevTileDistance;
+        float lastSegmentViewportDistance;
+    };
+    
+    struct PlacedGlyph {
+        PlacedGlyph() = default;
+
+        PlacedGlyph(Point<float> point_, float angle_, optional<TileDistance> tileDistance_)
+            : point(point_), angle(angle_), tileDistance(std::move(tileDistance_))
+        {}
+        PlacedGlyph(PlacedGlyph&& other) noexcept
+            : point(std::move(other.point)), angle(other.angle), tileDistance(std::move(other.tileDistance))
+        {}
+        PlacedGlyph(const PlacedGlyph& other)
+            : point(std::move(other.point)), angle(other.angle), tileDistance(std::move(other.tileDistance))
+        {}
+        Point<float> point;
+        float angle;
+        optional<TileDistance> tileDistance;
+    };
+
+    float evaluateSizeForFeature(const ZoomEvaluatedSize& zoomEvaluatedSize, const PlacedSymbol& placedSymbol);
+    mat4 getLabelPlaneMatrix(const mat4& posMatrix, const bool pitchWithMap, const bool rotateWithMap, const TransformState& state, const float pixelsToTileUnits);
+    mat4 getGlCoordMatrix(const mat4& posMatrix, const bool pitchWithMap, const bool rotateWithMap, const TransformState& state, const float pixelsToTileUnits);
+    
+    using PointAndCameraDistance = std::pair<Point<float>,float>;
+    PointAndCameraDistance project(const Point<float>& point, const mat4& matrix);
+
+    void reprojectLineLabels(gl::VertexVector<SymbolDynamicLayoutAttributes::Vertex>&, const std::vector<PlacedSymbol>&,
+            const mat4& posMatrix, const style::SymbolPropertyValues&,
+            const RenderTile&, const SymbolSizeBinder& sizeBinder, const TransformState&);
+    
+    optional<std::pair<PlacedGlyph, PlacedGlyph>> placeFirstAndLastGlyph(const float fontScale,
+                                                            const float lineOffsetX,
+                                                            const float lineOffsetY,
+                                                            const bool flip,
+                                                            const Point<float>& anchorPoint,
+                                                            const Point<float>& tileAnchorPoint,
+                                                            const PlacedSymbol& symbol,
+                                                            const mat4& labelPlaneMatrix,
+                                                            const bool returnTileDistance);
+
+} // end namespace mbgl