wp_presentation vs wl_surface_frame

[Maksim Sisov]

Hello!

I'm currently working on some begin frame issues in Chromium and I
started to wonder if we use available mechanism for synchronization
correctly.

Wayland compositors may support wl_surface_frame and wp_presentation or
just wl_surface_frame. At the moment, Chromium uses both wp_presentation
to adjust own begin frame scheduling based on the presentation time.
Also, it utilizes wl_surface_frame just before attaching new wl_buffers
to wl_surfaces (we use dmabuf + zwp_linux_dmabuf).

I wonder if using wl_surface_frame along with wp_presentation is
necessary except the cases when a window is fully occluded.

-- 
Best Regards,
Maksim Sisov