Enum OverviewQualityHint 

pub enum OverviewQualityHint {
    ComputeAtRuntime,
    AllUsable,
    NoneUsable,
    MinUsable(usize),
}

Hint for pre-computed overview quality analysis

This allows callers to skip the expensive runtime analysis by providing a pre-computed value (e.g., from a database).

Variants

ComputeAtRuntime

Compute at runtime (default behavior) - samples tiles to determine quality

AllUsable

All overviews have sufficient data density

NoneUsable

No overviews have sufficient data - always use full resolution

MinUsable(usize)

Use overviews 0..=n (where n is the minimum usable overview index)

Implementations

impl OverviewQualityHint

pub fn from_db_value(value: Option<i32>) -> Self

Convert from database representation (Option<i32>)

• None -> ComputeAtRuntime (legacy layers without pre-computed value)
• Some(-1) -> NoneUsable (force full resolution)
• Some(-2) -> AllUsable (all overviews are good)
• Some(n) where n >= 0 -> MinUsable(n as usize)

pub fn to_db_value(&self) -> Option<i32>

Convert to database representation (Option<i32>)

Trait Implementations

impl Clone for OverviewQualityHint

fn clone(&self) -> OverviewQualityHint

Returns a duplicate of the value.

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

Performs copy-assignment from source.

impl Debug for OverviewQualityHint

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

Formats the value using the given formatter.

impl Default for OverviewQualityHint

fn default() -> OverviewQualityHint

Returns the “default value” for a type.

impl PartialEq for OverviewQualityHint

fn eq(&self, other: &OverviewQualityHint) -> 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 OverviewQualityHint

impl Eq for OverviewQualityHint

impl StructuralPartialEq for OverviewQualityHint