0513a95a06
This timer delays the output_repaint towards the end of the refresh period, reducing the time from repaint to present. The length of the repaint window can be set in weston.ini. The call to weston_output_schedule_repaint_reset() is delayed by one more period. If we exit the continuous repaint loop (set output->repaint_scheduled to false) in finish_frame, we may call start_repaint_loop() unnecessarily. The problem case was actually observed with two outputs on the DRM backend at 60 Hz, and 7 ms repaint-window. During a window move, one output was constantly falling off the continuous repaint loop and introducing additional one frame latency, leading to jerky window motion. This code now avoids the problem. Changes in v2: - Rename repaint_delay_timer to repaint_timer and output_repaint_delay_handler to output_repaint_timer_handler. - When computing the delay, take the current time into account. The timer uses a relative timeout, so we have to subtract any time already gone. Note, that 'gone' may also be negative. DRM has a habit of predicting the page flip timestamp so it may be still in the future when we get the completion event. - Do also a sanity check 'msec > 1000'. In the unlikely case that something fails to provide a good timestamp, never delay for more than one second. Signed-off-by: Pekka Paalanen <pekka.paalanen@collabora.co.uk> Reviewed-By: Derek Foreman <derekf@osg.samsung.com> Reviewed-by: Bryce Harrington <bryce@osg.samsung.com>
Weston Weston is the reference implementation of a Wayland compositor, and a useful compositor in its own right. Weston has various backends that lets it run on Linux kernel modesetting and evdev input as well as under X11. Weston ships with a few example clients, from simple clients that demonstrate certain aspects of the protocol to more complete clients and a simplistic toolkit. There is also a quite capable terminal emulator (weston-terminal) and an toy/example desktop shell. Finally, weston also provides integration with the Xorg server and can pull X clients into the Wayland desktop and act as a X window manager. Refer to http://wayland.freedesktop.org/building.html for building weston and its dependencies. The test suite can be invoked via `make check`; see http://wayland.freedesktop.org/testing.html for additional details.