From 24eff45af20e8fa7bbdd567a9c03da6228cd6678 Mon Sep 17 00:00:00 2001
From: Julian Rex <julian.rex@mapbox.com>
Date: Mon, 16 Sep 2019 11:04:59 -0400
Subject: [ios] report error if rendering takes > 1 second.

---
 platform/darwin/src/MGLTypes.h        |  4 +++-
 platform/ios/src/MGLMapView+OpenGL.mm | 23 ++++++++++++++++++-----
 2 files changed, 21 insertions(+), 6 deletions(-)

diff --git a/platform/darwin/src/MGLTypes.h b/platform/darwin/src/MGLTypes.h
index 7e0dd27141..df3c61a61c 100644
--- a/platform/darwin/src/MGLTypes.h
+++ b/platform/darwin/src/MGLTypes.h
@@ -55,7 +55,9 @@ typedef NS_ENUM(NSInteger, MGLErrorCode) {
     /** Source is in use and cannot be removed */
     MGLErrorCodeSourceIdentifierMismatch = 8,
     /** An error occurred while modifying the offline storage database */
-    MGLErrorCodeModifyingOfflineStorageFailed = 9
+    MGLErrorCodeModifyingOfflineStorageFailed = 9,
+    /** An error occurred while rendering */
+    MGLErrorCodeRenderingError = 10,
 };
 
 /** Options for enabling debugging features in an `MGLMapView` instance. */
diff --git a/platform/ios/src/MGLMapView+OpenGL.mm b/platform/ios/src/MGLMapView+OpenGL.mm
index e599024e26..ad30b608e5 100644
--- a/platform/ios/src/MGLMapView+OpenGL.mm
+++ b/platform/ios/src/MGLMapView+OpenGL.mm
@@ -2,6 +2,11 @@
 #import "MGLLoggingConfiguration_Private.h"
 #import "MGLMapView+OpenGL.h"
 
+#if TARGET_OS_IPHONE || TARGET_OS_SIMULATOR
+#import "MMEConstants.h"
+#import "MGLMapboxEvents.h"
+#endif
+
 #include <mbgl/gl/renderable_resource.hpp>
 
 #import <GLKit/GLKit.h>
@@ -96,7 +101,7 @@ void MGLMapViewOpenGLImpl::setPresentsWithTransaction(const bool value) {
 
 void MGLMapViewOpenGLImpl::display() {
     auto& resource = getResource<MGLMapViewOpenGLRenderableResource>();
-#ifdef MGL_RECREATE_GL_IN_AN_EMERGENCY
+
     // See https://github.com/mapbox/mapbox-gl-native/issues/14232
     // glClear can be blocked for 1 second. This code is an "escape hatch",
     // an attempt to detect this situation and rebuild the GL views.
@@ -106,14 +111,22 @@ void MGLMapViewOpenGLImpl::display() {
         CFTimeInterval after = CACurrentMediaTime();
 
         if (after - before >= 1.0) {
+#ifdef MGL_RECREATE_GL_IN_AN_EMERGENCY
             dispatch_async(dispatch_get_main_queue(), ^{
               emergencyRecreateGL();
             });
-        }
-    }
-    else
+#else
+            static dispatch_once_t onceToken;
+            dispatch_once(&onceToken, ^{
+                NSError *error = [NSError errorWithDomain:MGLErrorDomain
+                                                     code:MGLErrorCodeRenderingError
+                                                 userInfo:@{ NSLocalizedFailureReasonErrorKey :
+                                                                 @"https://github.com/mapbox/mapbox-gl-native/issues/14232" }];
+                [[MMEEventsManager sharedManager] reportError:error];
+            });
 #endif
-    {
+        }
+    } else {
         [resource.glView display];
     }
 }
-- 
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