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Use cross-platform std::chrono in getTickCount()

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Add conditional compilation directives to enable uses of std::chrono on supported compilers. Use std::chrono::steady_clock as a source to retrieve current tick count and clock frequency.

Fixes opencv/opencv#6902.
This commit is contained in:
Rong Mantle Bao 2022-07-09 07:20:44 +08:00
parent 0a88f84847
commit db70676933
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GPG Key ID: 419F9DDF521C96C1
1 changed files with 19 additions and 2 deletions
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21
modules/core/src/system.cpp
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@ -302,6 +302,16 @@ DECLARE_CV_CPUID_X86
#endif
#if ((__cplusplus >= 201103L) || (defined(_MSC_VER) && _MSC_VER >= 1800))
#define HAVE_CXX11 1
#else
#define HAVE_CXX11 0
#endif
#if HAVE_CXX11
#include <chrono>
#endif
namespace cv
{
@ -840,7 +850,10 @@ bool useOptimized(void)
int64 getTickCount(void)
{
#if defined _WIN32 || defined WINCE
#if HAVE_CXX11
std::chrono::steady_clock::time_point now = std::chrono::steady_clock::now();
return (int64)now.time_since_epoch().count();
#elif defined _WIN32 || defined WINCE
LARGE_INTEGER counter;
QueryPerformanceCounter( &counter );
return (int64)counter.QuadPart;
@ -859,7 +872,11 @@ int64 getTickCount(void)
double getTickFrequency(void)
{
#if defined _WIN32 || defined WINCE
#if HAVE_CXX11
using clock_period_t = std::chrono::steady_clock::duration::period;
double clock_freq = clock_period_t::den / clock_period_t::num;
return clock_freq;
#elif defined _WIN32 || defined WINCE
LARGE_INTEGER freq;
QueryPerformanceFrequency(&freq);
return (double)freq.QuadPart;