pub fn parse_layers(resolver: &Resolver<'_>, sink: &WarningSink) -> Vec<Layer>Expand description
Walk the catalog’s /OCProperties /OCGs array and produce one
Layer per OCG.
Returns an empty Vec when the document has no OCGs. Default
visibility comes from /OCProperties /D /OFF; locked state from
/OCProperties /D /Locked. Both arrays may be indirect-referenced.
Cycles cannot occur (the OCGs array is a flat list of refs), so no
visited-set guarding is needed; malformed entries (non-dict, no
/Type /OCG) are skipped with a warning.