Function solana_stake_program::stake_state::calculate_stake_rewards

fn calculate_stake_rewards(
    rewarded_epoch: Epoch,
    stake: &Stake,
    point_value: &PointValue,
    vote_state: &VoteState,
    stake_history: Option<&StakeHistory>,
    inflation_point_calc_tracer: Option<impl Fn(&InflationPointCalculationEvent)>,
    credits_auto_rewind: bool
) -> Option<CalculatedStakeRewards>

for a given stake and vote_state, calculate what distributions and what updates should be made returns a tuple in the case of a payout of:

• staker_rewards to be distributed
• voter_rewards to be distributed
• new value for credits_observed in the stake returns None if there’s no payout or if any deserved payout is < 1 lamport