From 1624a523105b709259e7222cf645598c342e0a9e Mon Sep 17 00:00:00 2001
From: Asheem Mamoowala <asheem.mamoowala@mapbox.com>
Date: Mon, 25 Sep 2017 11:38:04 -0700
Subject: Custom Tile

---
 cmake/core-files.cmake        |  2 ++
 src/mbgl/tile/custom_tile.cpp | 73 +++++++++++++++++++++++++++++++++++++++++++
 src/mbgl/tile/custom_tile.hpp | 33 +++++++++++++++++++
 3 files changed, 108 insertions(+)
 create mode 100644 src/mbgl/tile/custom_tile.cpp
 create mode 100644 src/mbgl/tile/custom_tile.hpp

diff --git a/cmake/core-files.cmake b/cmake/core-files.cmake
index 18d07cd20e..629a9a554a 100644
--- a/cmake/core-files.cmake
+++ b/cmake/core-files.cmake
@@ -495,6 +495,8 @@ set(MBGL_CORE_FILES
 
     # tile
     include/mbgl/tile/tile_id.hpp
+    src/mbgl/tile/custom_tile.cpp
+    src/mbgl/tile/custom_tile.hpp
     src/mbgl/tile/geojson_tile.cpp
     src/mbgl/tile/geojson_tile.hpp
     src/mbgl/tile/geojson_tile_data.hpp
diff --git a/src/mbgl/tile/custom_tile.cpp b/src/mbgl/tile/custom_tile.cpp
new file mode 100644
index 0000000000..b7057d447e
--- /dev/null
+++ b/src/mbgl/tile/custom_tile.cpp
@@ -0,0 +1,73 @@
+#include <mbgl/tile/custom_tile.hpp>
+#include <mbgl/tile/geometry_tile_data.hpp>
+#include <mbgl/renderer/query.hpp>
+#include <mbgl/renderer/tile_parameters.hpp>
+#include <mbgl/style/filter_evaluator.hpp>
+#include <mbgl/util/logging.hpp>
+#include <mbgl/actor/scheduler.hpp>
+
+#include <mapbox/geojsonvt.hpp>
+
+namespace mbgl {
+
+CustomTile::CustomTile(const OverscaledTileID& overscaledTileID,
+                         std::string sourceID_,
+                         const TileParameters& parameters,
+                         const style::GeoJSONOptions options_)
+    : GeometryTile(overscaledTileID, sourceID_, parameters),
+    options(options_),
+    actor(*Scheduler::GetCurrent(), std::bind(&CustomTile::setTileData, this, std::placeholders::_1, std::placeholders::_2)) {
+
+}
+
+void CustomTile::setTileData(const CanonicalTileID&, const style::FetchTileResult& result) {
+    if (result.is<style::Error>()) {
+        Log::Error(Event::Render, "FetchTile (%d, %d, %d) error: %s", id.canonical.z, id.canonical.x, id.canonical.y, result.get<style::Error>().message.c_str());
+        return;
+    }
+    
+    auto geoJSON = result.get<mapbox::geojson::geojson>();
+    auto data = mapbox::geometry::feature_collection<int16_t>();
+    if (geoJSON.is<FeatureCollection>() && !geoJSON.get<FeatureCollection>().empty()) {
+        const double scale = util::EXTENT / options.tileSize;
+
+        mapbox::geojsonvt::Options vtOptions;
+        vtOptions.maxZoom = options.maxzoom;
+        vtOptions.extent = util::EXTENT;
+        vtOptions.buffer = std::round(scale * options.buffer);
+        vtOptions.tolerance = scale * options.tolerance;
+        auto geojsonVt = std::make_unique<mapbox::geojsonvt::GeoJSONVT>(geoJSON, vtOptions);
+        data = geojsonVt->getTile(id.canonical.z, id.canonical.x, id.canonical.y).features;
+    }
+    setData(std::make_unique<GeoJSONTileData>(std::move(data)));
+}
+
+void CustomTile::setNecessity(Necessity) {}
+    
+void CustomTile::querySourceFeatures(
+    std::vector<Feature>& result,
+    const SourceQueryOptions& queryOptions) {
+    
+    // Ignore the sourceLayer, there is only one
+    auto layer = getData()->getLayer({});
+    
+    if (layer) {
+        auto featureCount = layer->featureCount();
+        for (std::size_t i = 0; i < featureCount; i++) {
+            auto feature = layer->getFeature(i);
+            
+            // Apply filter, if any
+            if (queryOptions.filter && !(*queryOptions.filter)(*feature)) {
+                continue;
+            }
+            
+            result.push_back(convertFeature(*feature, id.canonical));
+        }
+    }
+}
+
+ActorRef<style::FetchTileCallback> CustomTile::fetchTileCallback() {
+    return actor.self();
+}
+
+} // namespace mbgl
diff --git a/src/mbgl/tile/custom_tile.hpp b/src/mbgl/tile/custom_tile.hpp
new file mode 100644
index 0000000000..66606d2224
--- /dev/null
+++ b/src/mbgl/tile/custom_tile.hpp
@@ -0,0 +1,33 @@
+#pragma once
+
+#include <mbgl/tile/geometry_tile.hpp>
+#include <mbgl/util/feature.hpp>
+#include <mbgl/style/sources/custom_vector_source.hpp>
+#include <mbgl/style/sources/geojson_source.hpp>
+
+namespace mbgl {
+
+class TileParameters;
+
+class CustomTile: public GeometryTile {
+public:
+    CustomTile(const OverscaledTileID&,
+               std::string sourceID,
+               const TileParameters&,
+               const style::GeoJSONOptions);
+
+    void setTileData(const CanonicalTileID& tileID, const style::FetchTileResult& result);
+
+    void setNecessity(Necessity) final;
+    
+    void querySourceFeatures(
+        std::vector<Feature>& result,
+        const SourceQueryOptions&) override;
+    
+    ActorRef<style::FetchTileCallback> fetchTileCallback();
+private:
+    const style::GeoJSONOptions options;
+    Actor<style::FetchTileCallback> actor;
+};
+
+} // namespace mbgl
-- 
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