Re: Answers to some comments about frame synchronization

[Owen Taylor <otaylor redhat com>]

On Fri, 2013-02-15 at 09:21 +0100, Alexander Larsson wrote:

> > In terms of using timeBeginPeriod() and timeEndPeriod(), unfortunately,
> > the GDK level API has no concept of a "running animation", so it's not
> > clear when GDK would set up a period. We could add such a thing -
> > basically gdk_frame_clock_begin_continual_updates() - which would help
> > for style animations and gtk_widget_add_tick_count(). It wouldn't help
> > if a higher level built on top of GTK+ has an interface like
> > window.requestAnimationFrame() or we're reacting to mouse events.
>
> We could add such an api though. For instance, we could have a
> refcounted api on the paint clock like gdk_paint_clock_use/unuse() such
> that any running animations would cause a clock use and thus higher
> timing resolution on win32. 

I tried creating such an API - patch at:

 https://bugzilla.gnome.org/show_bug.cgi?id=693934

It's a reasonable addition, and in some ways an improvement, though it
makes the API a bit less minimal.

- Owen