diff options
author | 2015-10-22 13:33:21 -0700 | |
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committer | 2015-10-22 13:33:22 -0700 | |
commit | a1840d50e29fd95e4df2d1168fe54c34c2a5c30c (patch) | |
tree | 77e89242b2f3ae8ecf71da647fc651b3b124012f /tools/timer/SysTimer_windows.cpp | |
parent | c9b5f8b1522e72449d704d30ed6aee4fc6211ee8 (diff) |
SkTime::GetNSecs()
- Move high-precision wall timers from tools/timer to SkTime.
- Implement SkTime::GetMSecs() in terms of SkTime::GetNSecs().
- Delete unused tools/timer code.
I have no idea what's going on there in src/animator.
I don't intend to investigate.
BUG=skia:
Committed: https://skia.googlesource.com/skia/+/70084cbc16ee8162649f2601377feb6e49de0217
CQ_EXTRA_TRYBOTS=client.skia.compile:Build-Ubuntu-GCC-x86_64-Debug-CrOS_Link-Trybot
Review URL: https://codereview.chromium.org/1422513003
Diffstat (limited to 'tools/timer/SysTimer_windows.cpp')
-rw-r--r-- | tools/timer/SysTimer_windows.cpp | 53 |
1 files changed, 0 insertions, 53 deletions
diff --git a/tools/timer/SysTimer_windows.cpp b/tools/timer/SysTimer_windows.cpp deleted file mode 100644 index 8e45b4a68e..0000000000 --- a/tools/timer/SysTimer_windows.cpp +++ /dev/null @@ -1,53 +0,0 @@ -/* - * Copyright 2011 Google Inc. - * - * Use of this source code is governed by a BSD-style license that can be - * found in the LICENSE file. - */ -#include "SysTimer_windows.h" - -#include <intrin.h> - -static ULONGLONG win_cpu_time() { - FILETIME createTime; - FILETIME exitTime; - FILETIME usrTime; - FILETIME sysTime; - if (0 == GetProcessTimes(GetCurrentProcess(), &createTime, &exitTime, &sysTime, &usrTime)) { - return 0; - } - ULARGE_INTEGER start_cpu_sys; - ULARGE_INTEGER start_cpu_usr; - start_cpu_sys.LowPart = sysTime.dwLowDateTime; - start_cpu_sys.HighPart = sysTime.dwHighDateTime; - start_cpu_usr.LowPart = usrTime.dwLowDateTime; - start_cpu_usr.HighPart = usrTime.dwHighDateTime; - return start_cpu_sys.QuadPart + start_cpu_usr.QuadPart; -} - -void SysTimer::startCpu() { - fStartCpu = win_cpu_time(); -} - -double SysTimer::endCpu() { - ULONGLONG end_cpu = win_cpu_time(); - return static_cast<double>(end_cpu - fStartCpu) / 10000.0L; -} - -// On recent Intel chips (roughly, "has Core or Atom in its name") __rdtsc will always tick -// at the CPU's maximum rate, even while power management clocks the CPU up and down. -// That's great, because it makes measuring wall time super simple. - -void SysTimer::startWall() { - fStartWall = __rdtsc(); -} - -double SysTimer::endWall() { - unsigned __int64 end = __rdtsc(); - - // This seems to, weirdly, give the CPU frequency in kHz. That's exactly what we want! - LARGE_INTEGER freq_khz; - QueryPerformanceFrequency(&freq_khz); - - return static_cast<double>(end - fStartWall) / static_cast<double>(freq_khz.QuadPart); -} |