Module limits 

Limits applied when interpreting font data.

Font files can describe structures that recurse, refer to themselves, or are simply enormous. Nothing here comes from the OpenType specification: these are the bounds this crate places on how much work one operation will do before giving up, so that a malformed or hostile font cannot turn a parse into a hang.

Constants

MAX_COMPOSITE_EDGES

Maximum number of references followed while assembling one composite glyph, whether a glyf component tree or a VARC graph.

MAX_FEATURE_INDICES

Maximum total number of feature indices visited across the language systems of a layout table.

MAX_LANGSYS

Maximum number of language systems visited in a layout table’s script list.

MAX_LANGSYS_FEATURE_COUNT

Maximum total number of feature indices referenced by the language systems visited when pruning a layout table’s language systems.

MAX_LOOKUP_VISIT_COUNT

Maximum number of lookups visited by one layout closure operation.

MAX_OUTLINE_POINTS

Maximum number of points in a single assembled outline.

MAX_RECURSION_DEPTH

Maximum depth for structures that nest.

MAX_SCRIPTS

Maximum number of scripts visited in a layout table’s script list.