bloc table

Indexes the location of bitmap glyph data within the bdat table for Apple-format bitmap fonts.

Scope

• Format family: Apple AAT
• Table tag in JSON: bloc

Overview

The bloc (bitmap location) table is Apple's equivalent of the OpenType CBLC/EBLC tables. It stores location and index data for embedded bitmap glyphs.

The binary format is identical to CBLC — Font Flux JS delegates parsing and writing to the CBLC implementation.

Specs

• https://developer.apple.com/fonts/TrueType-Reference-Manual/RM06/Chap6bloc.html

JSON Structure

Same structure as the CBLC table. See that page for field documentation.

Notes

• Always paired with a bdat table (the bitmap data).
• Preserve _checksum for stable round-tripping.
• Validate with .validate() after edits.