[core] Measuring tiles requesting/parsing time using logging (#12152)

* Tile timing

* Refactor logging code

* Keep the scope of `messageStream` constrained

* Make log message more clear

* Fix crash issue if onlineResponse.data is null

1 files changed, 15 insertions, 0 deletions

diff --git a/src/mbgl/util/stopwatch.hpp b/src/mbgl/util/stopwatch.hpp
index 6214dae958..0c91342a57 100644
--- a/src/mbgl/util/stopwatch.hpp
+++ b/src/mbgl/util/stopwatch.hpp
@@ -4,9 +4,24 @@
 #include <mbgl/util/chrono.hpp>
 
 #include <string>
+#include <sstream>
 
 namespace mbgl {
 namespace util {
+    
+#ifdef MBGL_TIMING
+// Declare 'watch' as a shared_ptr so it can be captured by value in a lambda function    
+#define MBGL_TIMING_START(watch)  std::shared_ptr<util::stopwatch> watch = std::make_unique<util::stopwatch>(Event::Timing);
+#define MBGL_TIMING_FINISH(watch, message) \
+    do { \
+        std::stringstream messageStream;  \
+        messageStream << message; \
+        watch->report(messageStream.str()); \
+    } while (0);
+#else
+#define MBGL_TIMING_START(watch)
+#define MBGL_TIMING_FINISH(watch, message)
+#endif
 
 #ifndef DISABLE_STOPWATCH
 class stopwatch {