Struct TierFeatures 

pub struct TierFeatures {

    pub tier: LayoutTier,
    pub shaped_text: bool,
    pub terminal_fallback: bool,
    pub optimal_breaking: bool,
    pub hyphenation: bool,
    pub justification: bool,
    pub tracking: bool,
    pub baseline_grid: bool,
    pub paragraph_spacing: bool,
    pub first_line_indent: bool,
    pub width_cache: bool,
    pub shaping_cache: bool,
    pub incremental_diff: bool,
    pub subcell_spacing: bool,
}

Feature toggles for a quality tier.

Each flag indicates whether a subsystem feature is active at this tier. Features are monotonically enabled: if a feature is on at tier T, it is also on at every tier above T.

Fields

tier: LayoutTier

Which tier these features apply to.

shaped_text: bool

Use the shaped text path (HarfBuzz/rustybuzz) when available.

terminal_fallback: bool

Use the terminal (ClusterMap) fallback path.

optimal_breaking: bool

Use Knuth-Plass optimal line breaking.

hyphenation: bool

Use hyphenation for line breaking.

justification: bool

Enable full justification (stretch/shrink word spaces).

tracking: bool

Enable inter-character tracking.

baseline_grid: bool

Activate baseline grid snapping.

paragraph_spacing: bool

Apply paragraph spacing.

first_line_indent: bool

Apply first-line indent.

width_cache: bool

Use the width cache.

shaping_cache: bool

Use the shaping cache.

incremental_diff: bool

Use incremental (dirty-region) diff.

subcell_spacing: bool

Use sub-cell spacing (1/256 cell precision).

Implementations

impl TierFeatures

pub fn active_list(&self) -> Vec<&'static str>

Human-readable list of active features.

Trait Implementations

impl Clone for TierFeatures

fn clone(&self) -> TierFeatures

Returns a duplicate of the value.

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

Performs copy-assignment from source.

impl Debug for TierFeatures

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

Formats the value using the given formatter.

impl Display for TierFeatures

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

Formats the value using the given formatter.

impl PartialEq for TierFeatures

fn eq(&self, other: &TierFeatures) -> bool

Tests for self and other values to be equal, and is used by ==.

fn ne(&self, other: &Rhs) -> bool

Tests for !=. The default implementation is almost always sufficient, and should not be overridden without very good reason.

impl Copy for TierFeatures

impl Eq for TierFeatures

impl StructuralPartialEq for TierFeatures