| // Copyright 2011 Google Inc. All Rights Reserved. |
| // |
| // This code is licensed under the same terms as WebM: |
| // Software License Agreement: http://www.webmproject.org/license/software/ |
| // Additional IP Rights Grant: http://www.webmproject.org/license/additional/ |
| // ----------------------------------------------------------------------------- |
| // |
| // Helper functions to measure elapsed time. |
| // |
| // Author: Mikolaj Zalewski (mikolajz@google.com) |
| |
| #ifndef WEBP_EXAMPLES_STOPWATCH_H_ |
| #define WEBP_EXAMPLES_STOPWATCH_H_ |
| |
| #if defined _WIN32 && !defined __GNUC__ |
| #include <windows.h> |
| |
| typedef LARGE_INTEGER Stopwatch; |
| |
| static WEBP_INLINE double StopwatchReadAndReset(Stopwatch* watch) { |
| const LARGE_INTEGER old_value = *watch; |
| LARGE_INTEGER freq; |
| if (!QueryPerformanceCounter(watch)) |
| return 0.0; |
| if (!QueryPerformanceFrequency(&freq)) |
| return 0.0; |
| if (freq.QuadPart == 0) |
| return 0.0; |
| return (watch->QuadPart - old_value.QuadPart) / (double)freq.QuadPart; |
| } |
| |
| |
| #else /* !_WIN32 */ |
| #include <sys/time.h> |
| |
| typedef struct timeval Stopwatch; |
| |
| static WEBP_INLINE double StopwatchReadAndReset(Stopwatch* watch) { |
| const struct timeval old_value = *watch; |
| gettimeofday(watch, NULL); |
| return watch->tv_sec - old_value.tv_sec + |
| (watch->tv_usec - old_value.tv_usec) / 1000000.0; |
| } |
| |
| #endif /* _WIN32 */ |
| |
| #endif /* WEBP_EXAMPLES_STOPWATCH_H_ */ |