Function decide_constant_rate 

fn decide_constant_rate(
    st: &mut StripeState,
    settings: &CaptureSettings,
    damage: Damage,
    is_animated: bool,
    requested_idr: bool,
    recovery_idr: bool,
    encoder: EncoderQuality,
) -> HwFrameDecision

decide_hw_fullframe for a constant-rate session, recovery_idr the key frame a consumer asked for or the schedule’s.