From c444318ccf8410e08e8c617aab8ff3028a54fe27 Mon Sep 17 00:00:00 2001
From: Fabian Guerra <fabian.guerra@mapbox.com>
Date: Thu, 2 May 2019 15:44:38 -0700
Subject: [ios] Fix excessive cpu usage.

---
 platform/ios/src/MGLMapView.mm | 14 ++++++++++++++
 1 file changed, 14 insertions(+)

diff --git a/platform/ios/src/MGLMapView.mm b/platform/ios/src/MGLMapView.mm
index 7cebd57710..17c92c8a7d 100644
--- a/platform/ios/src/MGLMapView.mm
+++ b/platform/ios/src/MGLMapView.mm
@@ -108,6 +108,8 @@ typedef NS_ENUM(NSUInteger, MGLUserTrackingState) {
     MGLUserTrackingStateBeginSignificantTransition,
     /// The map view has finished moving to the first reported user location.
     MGLUserTrackingStateChanged,
+    
+    MGLUserTrackingStateThreshold,
 };
 
 const NSTimeInterval MGLAnimationDuration = 0.3;
@@ -5700,6 +5702,15 @@ public:
     {
         return;
     }
+    
+    CGPoint threshold = CGPointMake(20, 20);
+    if (self.userTrackingState != MGLUserTrackingStatePossible
+        && std::abs(currentPoint.x - correctPoint.x) <= threshold.x && std::abs(currentPoint.y - correctPoint.y) <= threshold.y
+        && self.userTrackingMode != MGLUserTrackingModeFollowWithCourse)
+    {
+        self.userTrackingState = MGLUserTrackingStateThreshold;
+        return;
+    }
 
     if (self.userTrackingMode == MGLUserTrackingModeFollowWithCourse
         && CLLocationCoordinate2DIsValid(self.targetCoordinate))
@@ -6549,6 +6560,9 @@ public:
     {
         userPoint = MGLPointRounded([self convertCoordinate:self.userLocation.coordinate toPointToView:self]);
     }
+    if (self.userTrackingState == MGLUserTrackingStateThreshold) {
+        self.userTrackingState = MGLUserTrackingStateChanged;
+    }
 
     if ( ! annotationView.superview)
     {
-- 
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