1 files changed, 104 insertions, 0 deletions
diff --git a/src/mbgl/tile/raster_dem_tile.hpp b/src/mbgl/tile/raster_dem_tile.hpp
new file mode 100644
index 0000000000..68f8a91e00
--- /dev/null
+++ b/src/mbgl/tile/raster_dem_tile.hpp
@@ -0,0 +1,104 @@
+#pragma once
+
+#include <mbgl/tile/tile.hpp>
+#include <mbgl/tile/tile_loader.hpp>
+#include <mbgl/tile/raster_dem_tile_worker.hpp>
+#include <mbgl/actor/actor.hpp>
+
+namespace mbgl {
+
+class Tileset;
+class TileParameters;
+class HillshadeBucket;
+
+enum class DEMTileNeighbors : uint8_t {
+  // 0b00000000
+  Empty = 0 << 1,
+
+  // 0b00000001
+  Left = 1 << 0,
+  // 0b00000010
+  Right = 1 << 1,
+  // 0b00000100
+  TopLeft = 1 << 2,
+  // 0b00001000
+  TopCenter = 1 << 3,
+  // 0b00010000
+  TopRight = 1 << 4,
+  // 0b00100000
+  BottomLeft = 1 << 5,
+  // 0b01000000
+  BottomCenter = 1 << 6,
+  // 0b10000000
+  BottomRight = 1 << 7,
+
+  // helper enums for tiles with no upper/lower neighbors
+  // and completely backfilled tiles
+
+  // 0b00011100
+  NoUpper = 0b00011100,
+  // 0b11100000
+  NoLower = 0b11100000,
+  // 0b11111111
+  Complete = 0b11111111
+};
+
+inline DEMTileNeighbors operator|(DEMTileNeighbors a, DEMTileNeighbors b) {
+    return static_cast<DEMTileNeighbors>(int(a) | int(b));
+};
+
+inline DEMTileNeighbors operator&(DEMTileNeighbors a, DEMTileNeighbors b) {
+    return static_cast<DEMTileNeighbors>(int(a) & int(b));
+}
+
+inline bool operator!=(DEMTileNeighbors a, DEMTileNeighbors b) {
+    return static_cast<unsigned char>(a) != static_cast<unsigned char>(b);
+}
+
+namespace style {
+class Layer;
+} // namespace style
+
+class RasterDEMTile : public Tile {
+public:
+    RasterDEMTile(const OverscaledTileID&,
+                   const TileParameters&,
+                   const Tileset&);
+    ~RasterDEMTile() override;
+
+    void setNecessity(TileNecessity) final;
+
+    void setError(std::exception_ptr);
+    void setMetadata(optional<Timestamp> modified, optional<Timestamp> expires);
+    void setData(std::shared_ptr<const std::string> data);
+
+    void upload(gl::Context&) override;
+    Bucket* getBucket(const style::Layer::Impl&) const override;
+
+    HillshadeBucket* getBucket() const;
+    void backfillBorder(const RasterDEMTile& borderTile, const DEMTileNeighbors mask);
+    
+    // neighboringTiles is a bitmask for which neighboring tiles have been backfilled
+    // there are max 8 possible neighboring tiles, so each bit represents one neighbor
+    DEMTileNeighbors neighboringTiles = DEMTileNeighbors::Empty;
+    
+    void setMask(TileMask&&) override;
+
+    void onParsed(std::unique_ptr<HillshadeBucket> result, uint64_t correlationID);
+    void onError(std::exception_ptr, uint64_t correlationID);
+
+private:
+    TileLoader<RasterDEMTile> loader;
+
+    std::shared_ptr<Mailbox> mailbox;
+    Actor<RasterDEMTileWorker> worker;
+    
+    uint64_t correlationID = 0;
+
+    // Contains the Bucket object for the tile. Buckets are render
+    // objects and they get added by tile parsing operations.
+    std::unique_ptr<HillshadeBucket> bucket;
+
+};
+
+} // namespace mbgl