2 files changed, 15 insertions, 0 deletions
diff --git a/platform/darwin/src/MGLGeometry.mm b/platform/darwin/src/MGLGeometry.mm
index 1540a3a741..43bf74c407 100644
--- a/platform/darwin/src/MGLGeometry.mm
+++ b/platform/darwin/src/MGLGeometry.mm
@@ -4,6 +4,10 @@
 
 #import <mbgl/util/projection.hpp>
 
+#if !TARGET_OS_IPHONE && !TARGET_OS_SIMULATOR
+#import <Cocoa/Cocoa.h>
+#endif
+
 /** Vertical field of view, measured in degrees, for determining the altitude
     of the viewpoint.
 
@@ -57,3 +61,12 @@ double MGLZoomLevelForAltitude(CLLocationDistance altitude, CGFloat pitch, CLLoc
     CGFloat mapPixelWidthAtZoom = std::cos(MGLRadiansFromDegrees(latitude)) * mbgl::util::M2PI * mbgl::util::EARTH_RADIUS_M / metersPerPixel;
     return ::log2(mapPixelWidthAtZoom / mbgl::util::tileSize);
 }
+
+CGPoint MGLPointRounded(CGPoint point) {
+#if TARGET_OS_IPHONE || TARGET_OS_SIMULATOR
+    CGFloat scaleFactor = [UIScreen instancesRespondToSelector:@selector(nativeScale)] ? [UIScreen mainScreen].nativeScale : [UIScreen mainScreen].scale;
+#elif TARGET_OS_MAC
+    CGFloat scaleFactor = [NSScreen mainScreen].backingScaleFactor;
+#endif
+    return CGPointMake(round(point.x * scaleFactor) / scaleFactor, round(point.y * scaleFactor) / scaleFactor);
+}
diff --git a/platform/darwin/src/MGLGeometry_Private.h b/platform/darwin/src/MGLGeometry_Private.h
index 88fcf5b576..87a19989c1 100644
--- a/platform/darwin/src/MGLGeometry_Private.h
+++ b/platform/darwin/src/MGLGeometry_Private.h
@@ -138,3 +138,5 @@ NS_INLINE MGLRadianCoordinate2D MGLRadianCoordinateAtDistanceFacingDirection(MGL
                                                          cos(distance) - sin(coordinate.latitude) * sin(otherLatitude));
     return MGLRadianCoordinate2DMake(otherLatitude, otherLongitude);
 }
+
+CGPoint MGLPointRounded(CGPoint point);