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/*
 *  Copyright (c) 2010 The WebM project authors. All Rights Reserved.
 *
 *  Use of this source code is governed by a BSD-style license
 *  that can be found in the LICENSE file in the root of the source
 *  tree. An additional intellectual property rights grant can be found
 *  in the file PATENTS.  All contributing project authors may
 *  be found in the AUTHORS file in the root of the source tree.
 */


#ifndef VPX_TIMER_H
#define VPX_TIMER_H

#if CONFIG_OS_SUPPORT

#if defined(_WIN32)
/*
 * Win32 specific includes
 */
#ifndef WIN32_LEAN_AND_MEAN
#define WIN32_LEAN_AND_MEAN
#endif
#include <windows.h>
#else
/*
 * POSIX specific includes
 */
#include <sys/time.h>

/* timersub is not provided by msys at this time. */
#ifndef timersub
#define timersub(a, b, result) \
    do { \
        (result)->tv_sec = (a)->tv_sec - (b)->tv_sec; \
        (result)->tv_usec = (a)->tv_usec - (b)->tv_usec; \
        if ((result)->tv_usec < 0) { \
            --(result)->tv_sec; \
            (result)->tv_usec += 1000000; \
        } \
    } while (0)
#endif
#endif


struct vpx_usec_timer
{
#if defined(_WIN32)
    LARGE_INTEGER  begin, end;
#else
    struct timeval begin, end;
#endif
};


static void
vpx_usec_timer_start(struct vpx_usec_timer *t)
{
#if defined(_WIN32)
    QueryPerformanceCounter(&t->begin);
#else
    gettimeofday(&t->begin, NULL);
#endif
}


static void
vpx_usec_timer_mark(struct vpx_usec_timer *t)
{
#if defined(_WIN32)
    QueryPerformanceCounter(&t->end);
#else
    gettimeofday(&t->end, NULL);
#endif
}


static long
vpx_usec_timer_elapsed(struct vpx_usec_timer *t)
{
#if defined(_WIN32)
    LARGE_INTEGER freq, diff;

    diff.QuadPart = t->end.QuadPart - t->begin.QuadPart;

    if (QueryPerformanceFrequency(&freq) && diff.QuadPart < freq.QuadPart)
        return (long)(diff.QuadPart * 1000000 / freq.QuadPart);

    return 1000000;
#else
    struct timeval diff;

    timersub(&t->end, &t->begin, &diff);
    return diff.tv_sec ? 1000000 : diff.tv_usec;
#endif
}

#else /* CONFIG_OS_SUPPORT = 0*/

/* Empty timer functions if CONFIG_OS_SUPPORT = 0 */
#ifndef timersub
#define timersub(a, b, result)
#endif

struct vpx_usec_timer
{
    void *dummy;
};

static void
vpx_usec_timer_start(struct vpx_usec_timer *t) { }

static void
vpx_usec_timer_mark(struct vpx_usec_timer *t) { }

static long
vpx_usec_timer_elapsed(struct vpx_usec_timer *t) { return 0; }

#endif /* CONFIG_OS_SUPPORT */

#endif