From ef62b78fce06ad93de87e9a6a6775ae33fff214d Mon Sep 17 00:00:00 2001
From: Bruno de Oliveira Abinader <bruno@mapbox.com>
Date: Tue, 18 Oct 2016 14:21:59 +0300
Subject: [core] TileCoordinate::fromLatLng no longer depens on TransformState

---
 include/mbgl/util/projection.hpp   |  2 +-
 src/mbgl/util/tile_coordinate.hpp  | 14 ++++++++------
 src/mbgl/util/tile_cover.cpp       | 11 +++++------
 test/tile/tile_coordinate.test.cpp |  4 ++--
 4 files changed, 16 insertions(+), 15 deletions(-)

diff --git a/include/mbgl/util/projection.hpp b/include/mbgl/util/projection.hpp
index 4212e5da7a..9ca3cd4ab5 100644
--- a/include/mbgl/util/projection.hpp
+++ b/include/mbgl/util/projection.hpp
@@ -2,9 +2,9 @@
 
 #include <mbgl/util/constants.hpp>
 #include <mbgl/util/geo.hpp>
+#include <mbgl/util/geometry.hpp>
 #include <mbgl/math/clamp.hpp>
 
-#include <cmath>
 
 namespace mbgl {
 
diff --git a/src/mbgl/util/tile_coordinate.hpp b/src/mbgl/util/tile_coordinate.hpp
index 46073c0dc9..bcd1c8444f 100644
--- a/src/mbgl/util/tile_coordinate.hpp
+++ b/src/mbgl/util/tile_coordinate.hpp
@@ -18,23 +18,25 @@ public:
     TileCoordinatePoint p;
     double z;
 
-    static TileCoordinate fromLatLng(const TransformState& state, double zoom, const LatLng& latLng) {
-        const double scale = std::pow(2, zoom - state.getZoom());
-        return { Projection::project(latLng, state.getScale()) * scale / double(util::tileSize), zoom };
+    static TileCoordinate fromLatLng(double zoom, const LatLng& latLng) {
+        const double scale = std::pow(2.0, zoom);
+        return { Projection::project(latLng, scale) / double(util::tileSize), zoom };
     }
 
     static TileCoordinate fromScreenCoordinate(const TransformState& state, double zoom, const ScreenCoordinate& screenCoordinate) {
-        return fromLatLng(state, zoom, state.screenCoordinateToLatLng(screenCoordinate));
+        return fromLatLng(zoom, state.screenCoordinateToLatLng(screenCoordinate));
     }
 
     TileCoordinate zoomTo(double zoom) const {
-        return { p * std::pow(2, zoom - z), zoom };
+        const double scaleDiff = std::pow(2.0, zoom - z);
+        return { p * scaleDiff, zoom };
     }
 
     static GeometryCoordinate toGeometryCoordinate(const UnwrappedTileID& tileID, const TileCoordinatePoint& point) {
+        const double scale = std::pow(2.0, tileID.canonical.z);
         auto zoomed = TileCoordinate { point, 0 }.zoomTo(tileID.canonical.z);
         return {
-            int16_t(util::clamp<int64_t>((zoomed.p.x - tileID.canonical.x - tileID.wrap * std::pow(2.0, tileID.canonical.z)) * util::EXTENT,
+            int16_t(util::clamp<int64_t>((zoomed.p.x - tileID.canonical.x - tileID.wrap * scale) * util::EXTENT,
                         std::numeric_limits<int16_t>::min(),
                         std::numeric_limits<int16_t>::max())),
             int16_t(util::clamp<int64_t>((zoomed.p.y - tileID.canonical.y) * util::EXTENT,
diff --git a/src/mbgl/util/tile_cover.cpp b/src/mbgl/util/tile_cover.cpp
index 5487fb269c..c6bf7d362a 100644
--- a/src/mbgl/util/tile_cover.cpp
+++ b/src/mbgl/util/tile_cover.cpp
@@ -147,13 +147,12 @@ std::vector<UnwrappedTileID> tileCover(const LatLngBounds& bounds_, int32_t z) {
         { std::max(bounds_.south(), -util::LATITUDE_MAX), bounds_.west() },
         { std::min(bounds_.north(),  util::LATITUDE_MAX), bounds_.east() });
 
-    const TransformState state;
     return tileCover(
-        TileCoordinate::fromLatLng(state, z, bounds.northwest()).p,
-        TileCoordinate::fromLatLng(state, z, bounds.northeast()).p,
-        TileCoordinate::fromLatLng(state, z, bounds.southeast()).p,
-        TileCoordinate::fromLatLng(state, z, bounds.southwest()).p,
-        TileCoordinate::fromLatLng(state, z, bounds.center()).p,
+        TileCoordinate::fromLatLng(z, bounds.northwest()).p,
+        TileCoordinate::fromLatLng(z, bounds.northeast()).p,
+        TileCoordinate::fromLatLng(z, bounds.southeast()).p,
+        TileCoordinate::fromLatLng(z, bounds.southwest()).p,
+        TileCoordinate::fromLatLng(z, bounds.center()).p,
         z);
 }
 
diff --git a/test/tile/tile_coordinate.test.cpp b/test/tile/tile_coordinate.test.cpp
index f2337c1e7f..740a03894d 100644
--- a/test/tile/tile_coordinate.test.cpp
+++ b/test/tile/tile_coordinate.test.cpp
@@ -41,7 +41,7 @@ TEST(TileCoordinate, FromLatLng) {
     for (const auto& pair : edges) {
         const auto& latLng = pair.first;
         const auto& screenCoordinate = pair.second;
-        const auto base = TileCoordinate::fromLatLng(transform.getState(), 0, latLng);
+        const auto base = TileCoordinate::fromLatLng(0, latLng);
 
         // 16 is the maximum zoom level where we actually compute placements.
         for (uint8_t integerZoom = 0; integerZoom <= 16; ++integerZoom) {
@@ -52,7 +52,7 @@ TEST(TileCoordinate, FromLatLng) {
                 latLng.latitude  == 0 ? 0.5 : latLng.latitude  == -util::LATITUDE_MAX  ? 1.0 : 0,
             };
 
-            const auto fromLatLng = TileCoordinate::fromLatLng(transform.getState(), zoom, latLng);
+            const auto fromLatLng = TileCoordinate::fromLatLng(zoom, latLng);
             ASSERT_DOUBLE_EQ(fromLatLng.z, zoom);
             ASSERT_DOUBLE_EQ(fromLatLng.p.x, tilePoint.x * maxTilesPerAxis);
             ASSERT_NEAR(fromLatLng.p.y, tilePoint.y * maxTilesPerAxis, 1.0e-7);
-- 
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