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