opbd: Optical Bounds Table

The opbd table is an Apple Advanced Typography (AAT) table.

class fontTools.ttLib.tables._o_p_b_d.table__o_p_b_d(tag: str | bytes | None = None)[source]

Bases: BaseTTXConverter

Optical Bounds table

The AAT opbd table contains optical boundary points for glyphs, which applications can use for the visual alignment of lines of text.

See also https://developer.apple.com/fonts/TrueType-Reference-Manual/RM06/Chap6opbd.html

subset_glyphs(s)