Use DwmGetCompositionTimingInfo to get vsync info on Windows

BUG=


Review URL: https://chromiumcodereview.appspot.com/10825053

git-svn-id: svn://svn.chromium.org/chrome/trunk/src@150395 0039d316-1c4b-4281-b951-d872f2087c98

ui/surface/accelerated_surface_win.cc

@@ -4,6 +4,7 @@
 
 #include "ui/surface/accelerated_surface_win.h"
 
+#include <dwmapi.h>
 #include <windows.h>
 #include <algorithm>
 
@@ -861,6 +862,24 @@ void AcceleratedPresenter::DoReleaseSurface() {
   source_texture_.Release();
 }
 
+void AcceleratedPresenter::GetPresentationStats(base::TimeTicks* timebase,
+                                                uint32* interval_numerator,
+                                                uint32* interval_denominator) {
+  lock_.AssertAcquired();
+
+  DWM_TIMING_INFO timing_info;
+  timing_info.cbSize = sizeof(timing_info);
+  HRESULT result = DwmGetCompositionTimingInfo(window_, &timing_info);
+  if (result != S_OK)
+    return;
+
+  *timebase = base::TimeTicks::FromQPCValue(
+      static_cast<LONGLONG>(timing_info.qpcVBlank));
+  // Swap the numerator/denominator to convert frequency to period.
+  *interval_numerator = timing_info.rateRefresh.uiDenominator;
+  *interval_denominator = timing_info.rateRefresh.uiNumerator;
+}
+
 AcceleratedSurface::AcceleratedSurface(gfx::NativeWindow window)
     : presenter_(g_accelerated_presenter_map.Pointer()->CreatePresenter(
           window)) {

ui/surface/accelerated_surface_win.h

@@ -77,6 +77,18 @@ class SURFACE_EXPORT AcceleratedPresenter
   bool DoRealPresent(HDC dc);
   void DoReleaseSurface();
 
+  // This gets the timestamp and period of the display's last vsync.
+  // The period is represented as a ratio which, when divided, will give you
+  // the interval in seconds. i.e.:
+  // inteval_in_seconds = interval_numerator / interval_denominator;
+  // For example, some machines will return an interval_numerator of 1001
+  // and an interval_denominator of 60000, resulting in an interval of
+  // 1001/60000 ~= .016683 seconds
+  // Note: This function assumes lock_ is acquired.
+  void GetPresentationStats(base::TimeTicks* timebase,
+                            uint32* interval_numerator,
+                            uint32* interval_denominator);
+
   // The thread with which this presenter has affinity.
   PresentThread* const present_thread_;
 

ui/ui.gyp

@@ -636,10 +636,12 @@
               'DelayLoadDLLs': [
                 'd2d1.dll',
                 'd3d10_1.dll',
+                'dwmapi.dll',
               ],
               'AdditionalDependencies': [
                 'd2d1.lib',
                 'd3d10_1.lib',
+                'dwmapi.lib',
               ],
             },
           },
@@ -647,6 +649,7 @@
             'libraries': [
               '-limm32.lib',
               '-ld2d1.lib',
+              '-ldwmapi.lib',
               '-loleacc.lib',
             ],
           },