Struct LayerUsage 

pub struct LayerUsage {
    pub creator_info: Option<CreatorInfo>,
    pub language: Option<LanguageUsage>,
    pub export: Option<ExportUsage>,
    pub zoom: Option<ZoomUsage>,
    pub print: Option<PrintUsage>,
    pub view: Option<ViewUsage>,
    pub user: Option<UserUsage>,
    pub page_element: Option<PageElementSubtype>,
}

Hints from the OCG /Usage sub-dict.

Every field is optional — a layer with no /Usage produces a fully-None value. Render-intent helpers in crate::layers (e.g. layer_set_for) turn these hints into automatic visibility adjustments under View / Print / Export intents.

Fields

creator_info: Option<CreatorInfo>

/CreatorInfo sub-dict — application that authored the layer.

language: Option<LanguageUsage>

/Language sub-dict — language tag and “preferred” flag.

export: Option<ExportUsage>

/Export sub-dict — visibility under export intent.

zoom: Option<ZoomUsage>

/Zoom sub-dict — min/max zoom range in which the layer is visible.

print: Option<PrintUsage>

/Print sub-dict — visibility and subtype hint under print intent.

view: Option<ViewUsage>

/View sub-dict — visibility under interactive view intent.

user: Option<UserUsage>

/User sub-dict — user/group ownership.

page_element: Option<PageElementSubtype>

/PageElement sub-dict — role on the page (header, footer, foreground, background, logo).

Trait Implementations

impl Clone for LayerUsage

fn clone(&self) -> LayerUsage

Returns a duplicate of the value.

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

Performs copy-assignment from source.

impl Debug for LayerUsage

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

Formats the value using the given formatter.

impl Default for LayerUsage

fn default() -> LayerUsage

Returns the “default value” for a type.