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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>
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