Enum ThumbnailStrategy 

pub enum ThumbnailStrategy {
    Auto,
    RenderOnly,
    Th44Only,
}

Policy for Document::thumbnails_with_strategy: how to source each page’s thumbnail.

Variants

Auto

Use the page’s embedded TH44 preview when present; otherwise fall back to a downscaled real render. Fastest and the default — see the quality note on Document::thumbnails.

RenderOnly

Always render the full page and downscale, ignoring any TH44 chunk. Slower but faithful; useful for quality comparisons against the TH44 path and for documents where a stale/absent thumbnail must never be shown.

Th44Only

Require an embedded TH44 chunk; returns an error for pages that lack one instead of falling back to render. Never touches the page’s BG44/JB2 background decode. Useful to prove a corpus’s thumbnail grid stays on the fast path, or to fail loudly rather than silently render.

Trait Implementations

impl Clone for ThumbnailStrategy

fn clone(&self) -> Self

Returns a duplicate of the value.

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

Performs copy-assignment from source.

impl Copy for ThumbnailStrategy

impl Debug for ThumbnailStrategy

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

Formats the value using the given formatter.

impl Default for ThumbnailStrategy

fn default() -> Self

Returns the “default value” for a type.

impl Eq for ThumbnailStrategy

impl PartialEq for ThumbnailStrategy

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

Equality operator ==.

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

Inequality operator !=.

impl StructuralPartialEq for ThumbnailStrategy