A surface ID for layer of background/panel image is set by key: background-id
or panel-id at weston.ini. To support multi screens, it also support offset,
surface-id-offset, to offset the surface ID to next ID for a layer on next
screen.
According to the above key, hmi-controller and ivi-shell-user-interface
who increments the number of screens per notification of wl_output.
crate surface and draw background/panel image on multi surface on screens.
Signed-off-by: Nobuhiko Tanibata <NOBUHIKO_TANIBATA@xddp.denso.co.jp>
Reviewed-by: Pekka Paalanen <pekka.paalanen@collabora.co.uk>
Nobuhiko Tanibata
2e656769b6