libweston: add weston_head::connected
Heads may be disconnected or connected and the compositor needs to be able to know the state to know which heads to take into use. Currently a single head is automatically created with an output, and outputs are only ever created as connected and destroyed on disconnection, so it suffices to set connected to true. In the future, backends are expected to create heads for both connected and disconnected connectors, so that a connector can be forced on without it being actually connected. v6: - split weston_head_is_enabled() to a new patch Signed-off-by: Pekka Paalanen <pekka.paalanen@collabora.co.uk> Reviewed-by: Derek Foreman <derekf@osg.samsung.com> Reviewed-by: Ian Ray <ian.ray@ge.com>
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