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win32: Request higher precision timers during animations

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The default windows timer resolution is 16msec, which is too little
for fluent animations (say at 60Hz). So, while a paint clock is
active we temporarily raise the timer resolution to 1 msec.
This commit is contained in:
Alexander Larsson 2013-02-18 15:37:22 +01:00
parent 1db87c897f
commit 5dbf814f0c
1 changed files with 32 additions and 0 deletions
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32
gdk/gdkframeclockidle.c
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@ -31,6 +31,10 @@
#include "gdkframeclockidle.h"
#include "gdk.h"
#ifdef G_OS_WIN32
#include <windows.h>
#endif
#define FRAME_INTERVAL 16667 // microseconds
struct _GdkFrameClockIdlePrivate
@ -51,6 +55,9 @@ struct _GdkFrameClockIdlePrivate
GdkFrameClockPhase phase;
guint in_paint_idle : 1;
#ifdef G_OS_WIN32
guint begin_period : 1;
#endif
};
static gboolean gdk_frame_clock_flush_idle (void *data);
@ -140,6 +147,14 @@ gdk_frame_clock_idle_dispose (GObject *object)
priv->paint_idle_id = 0;
}
#ifdef G_OS_WIN32
if (priv->begin_period)
{
timeEndPeriod(1);
priv->begin_period = FALSE;
}
#endif
G_OBJECT_CLASS (gdk_frame_clock_idle_parent_class)->dispose (object);
}
@ -474,6 +489,15 @@ gdk_frame_clock_idle_begin_updating (GdkFrameClock *clock)
GdkFrameClockIdle *clock_idle = GDK_FRAME_CLOCK_IDLE (clock);
GdkFrameClockIdlePrivate *priv = clock_idle->priv;
#ifdef G_OS_WIN32
/* We need a higher resolution timer while doing animations */
if (priv->updating_count == 0 && !priv->begin_period)
{
timeBeginPeriod(1);
priv->begin_period = TRUE;
}
#endif
priv->updating_count++;
maybe_start_idle (clock_idle);
}
@ -488,6 +512,14 @@ gdk_frame_clock_idle_end_updating (GdkFrameClock *clock)
priv->updating_count--;
maybe_stop_idle (clock_idle);
#ifdef G_OS_WIN32
if (priv->updating_count == 0 && priv->begin_period)
{
timeEndPeriod(1);
priv->begin_period = FALSE;
}
#endif
}
static void