[ios] Add experimental frame rate measurements to MGLMapView

Includes: average frame rate, average frame render duration, and instantaneous frame render duration.

1 files changed, 32 insertions, 0 deletions

diff --git a/platform/ios/src/MGLMapView_Experimental.h b/platform/ios/src/MGLMapView_Experimental.h
new file mode 100644
index 0000000000..94f8d67fb0
--- /dev/null
+++ b/platform/ios/src/MGLMapView_Experimental.h
@@ -0,0 +1,32 @@
+#import <Mapbox/Mapbox.h>
+
+@interface MGLMapView (Experimental)
+
+#pragma mark Rendering Performance Measurement
+
+/** Enable rendering performance measurement. */
+@property (nonatomic) BOOL experimental_enableFrameRateMeasurement;
+
+/**
+ Average frames per second over the previous second, updated once per second.
+
+ Requires `experimental_enableFrameRateMeasurement`.
+ */
+@property (nonatomic, readonly) CGFloat averageFrameRate;
+
+/**
+  Frame render duration for the previous frame, updated instantaneously.
+
+  Requires `experimental_enableFrameRateMeasurement`.
+ */
+@property (nonatomic, readonly) CFTimeInterval frameTime;
+
+/**
+ Average frame render duration over the previous second, updated once per
+ second.
+
+ Requires `experimental_enableFrameRateMeasurement`.
+ */
+@property (nonatomic, readonly) CFTimeInterval averageFrameTime;
+
+@end