Struct DiffStrategySelector 

pub struct DiffStrategySelector { /* private fields */ }

Bayesian diff strategy selector.

Maintains a Beta posterior over the change rate and selects the strategy with minimum expected cost each frame.

Implementations

impl DiffStrategySelector

pub fn new(config: DiffStrategyConfig) -> DiffStrategySelector

Create a new selector with the given configuration.

pub fn with_defaults() -> DiffStrategySelector

Create a selector with default configuration.

pub fn config(&self) -> &DiffStrategyConfig

Get the current configuration.

pub fn posterior_params(&self) -> (f64, f64)

Get the current posterior parameters.

pub fn posterior_mean(&self) -> f64

Get the posterior mean E[p].

pub fn posterior_variance(&self) -> f64

Get the posterior variance Var[p].

pub fn last_evidence(&self) -> Option<&StrategyEvidence>

Get the last decision evidence.

pub fn frame_count(&self) -> u64

Get frame count.

pub fn override_last_strategy( &mut self, strategy: DiffStrategy, reason: &'static str, )

Override the last decision’s selected strategy and guard reason.

Used when higher-level feature flags or probes force a different strategy than the Bayesian selector chose.

pub fn select( &mut self, width: u16, height: u16, dirty_rows: usize, ) -> DiffStrategy

Select the optimal strategy for the current frame.

Arguments

• width - Buffer width in cells
• height - Buffer height in rows
• dirty_rows - Number of rows marked dirty

Returns

The optimal DiffStrategy and stores evidence for later inspection.

pub fn select_with_scan_estimate( &mut self, width: u16, height: u16, dirty_rows: usize, dirty_scan_cells: usize, ) -> DiffStrategy

Select the optimal strategy using a scan-cell estimate for DirtyRows.

dirty_scan_cells should approximate the number of cells scanned when using DirtyRows (e.g., dirty-span coverage). If unknown, pass dirty_rows × width.

pub fn observe(&mut self, cells_scanned: usize, cells_changed: usize)

Update the posterior with observed change rate.

Arguments

• cells_scanned - Number of cells that were scanned for differences
• cells_changed - Number of cells that actually changed

pub fn reset(&mut self)

Reset the posterior to priors.

Trait Implementations

impl Clone for DiffStrategySelector

fn clone(&self) -> DiffStrategySelector

Returns a duplicate of the value.

fn clone_from(&mut self, source: &Self)

Performs copy-assignment from source.

impl Debug for DiffStrategySelector

fn fmt(&self, f: &mut Formatter<'_>) -> Result<(), Error>

Formats the value using the given formatter.

impl Default for DiffStrategySelector

fn default() -> DiffStrategySelector

Returns the “default value” for a type.