3 files changed, 34 insertions, 0 deletions

diff --git a/gui/gui.cpp b/gui/gui.cpp
index e9efc1db9..adc8a412b 100644
--- a/gui/gui.cpp
+++ b/gui/gui.cpp
@@ -57,6 +57,9 @@ extern "C"
 #include "blanktimer.hpp"
 #endif
 
+// Enable to print render time of each frame to the log file
+//#define PRINT_RENDER_TIME 1
+
 const static int CURTAIN_FADE = 32;
 
 using namespace rapidxml;
@@ -423,6 +426,11 @@ static int runPages(void)
 
 	DataManager::SetValue("tw_loaded", 1);
 
+#ifdef PRINT_RENDER_TIME
+	timespec start, end;
+	int32_t render_t, flip_t;
+#endif
+
 	for (;;)
 	{
 		loopTimer();
@@ -432,11 +440,30 @@ static int runPages(void)
 			int ret;
 
 			ret = PageManager::Update();
+
+#ifndef PRINT_RENDER_TIME
 			if (ret > 1)
 				PageManager::Render();
 
 			if (ret > 0)
 				flip();
+#else
+			if (ret > 1)
+			{
+				clock_gettime(CLOCK_MONOTONIC, &start);
+				PageManager::Render();
+				clock_gettime(CLOCK_MONOTONIC, &end);
+				render_t = TWFunc::timespec_diff_ms(start, end);
+
+				flip();
+				clock_gettime(CLOCK_MONOTONIC, &start);
+				flip_t = TWFunc::timespec_diff_ms(end, start);
+
+				LOGINFO("Render(): %u ms, flip(): %u ms, total: %u ms\n", render_t, flip_t, render_t+flip_t);
+			}
+			else if(ret == 1)
+				flip();
+#endif
 		}
 		else
 		{
diff --git a/twrp-functions.cpp b/twrp-functions.cpp
index 3f44fd2ce..df7174362 100644
--- a/twrp-functions.cpp
+++ b/twrp-functions.cpp
@@ -515,6 +515,12 @@ timespec TWFunc::timespec_diff(timespec& start, timespec& end)
 	return temp;
 }
 
+int32_t TWFunc::timespec_diff_ms(timespec& start, timespec& end)
+{
+	return ((end.tv_sec * 1000) + end.tv_nsec/1000000) -
+			((start.tv_sec * 1000) + start.tv_nsec/1000000);
+}
+
 int TWFunc::drop_caches(void) {
 	string file = "/proc/sys/vm/drop_caches";
 	string value = "3";
diff --git a/twrp-functions.hpp b/twrp-functions.hpp
index eb88ae2f3..587d7725e 100644
--- a/twrp-functions.hpp
+++ b/twrp-functions.hpp
@@ -60,6 +60,7 @@ public:
 	static int copy_file(string src, string dst, int mode); //copy file from src to dst with mode permissions
 	static unsigned int Get_D_Type_From_Stat(string Path);                      // Returns a dirent dt_type value using stat instead of dirent
 	static timespec timespec_diff(timespec& start, timespec& end);	            // Return a diff for 2 times
+	static int32_t timespec_diff_ms(timespec& start, timespec& end);            // Returns diff in ms
 	static int read_file(string fn, vector<string>& results); //read from file
 	static int read_file(string fn, string& results); //read from file
 	static int write_file(string fn, string& line); //write from file