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GDK W32: set update frequency and timestamp

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There is no easily apparent way of being notified when frame updates
happene exactly, so we just query frame info at the end of each paint.
If we query too often (faster than DWM refresh rate), we just get
the same values twice in a row, but that is, hopefully, highly unlikely.
This commit is contained in:
Руслан Ижбулатов 2018-04-09 19:07:10 +00:00
parent b7291ce533
commit c7ef697029
1 changed files with 32 additions and 0 deletions
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32
gdk/win32/gdksurface-win32.c
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@ -36,6 +36,7 @@
#include "gdkenumtypes.h"
#include "gdkwin32.h"
#include "gdkdisplayprivate.h"
#include "gdkframeclockprivate.h"
#include "gdkmonitorprivate.h"
#include "gdkwin32surface.h"
#include "gdkwin32cursor.h"
@ -337,12 +338,43 @@ gdk_win32_surface_begin_paint (GdkSurface *window)
{
GdkSurfaceImplWin32 *impl;
RECT window_rect;
DWM_TIMING_INFO timing_info;
LARGE_INTEGER tick_frequency;
GdkFrameTimings *timings = NULL;
GdkFrameClock *clock = NULL;
if (window == NULL || GDK_SURFACE_DESTROYED (window))
return TRUE;
impl = GDK_SURFACE_IMPL_WIN32 (window->impl);
clock = gdk_surface_get_frame_clock (window);
if (clock)
timings = gdk_frame_clock_get_timings (clock, gdk_frame_clock_get_frame_counter (clock));
if (timings)
{
timings->refresh_interval = 16667; /* default to 1/60th of a second */
timings->presentation_time = 0;
if (QueryPerformanceFrequency (&tick_frequency))
{
HRESULT hr;
timing_info.cbSize = sizeof (timing_info);
hr = DwmGetCompositionTimingInfo (NULL, &timing_info);
if (SUCCEEDED (hr))
{
timings->refresh_interval = timing_info.qpcRefreshPeriod * (gdouble)G_USEC_PER_SEC / tick_frequency.QuadPart;
timings->presentation_time = timing_info.qpcCompose * (gdouble)G_USEC_PER_SEC / tick_frequency.QuadPart;
}
}
timings->complete = TRUE;
}
/* Layered windows are moved *after* repaint.
* We supply our own surface, return FALSE to make GDK use it.
*/