README-TACHYFONT.md

TachyFont files

base

The preprocessed skeleton.

1. prepend info for client side processing
   • Code: base_header.py: BaseHeaderPrepare.prepare
2. zero hmtx/lsb and/or vmtx/tsb
   • Code: base_fonter.py: __zero_mtx
3. zero out glyph data
   • CFF code: base_fonter.py: __end_char_strings, __fill_char_strings, __zero_charset_fmt
   • TTF code: base_fonter.py: __zero_glyf
4. sparsify loca table
   • Code: base_fonter.py: __segment_table
5. zero cmaps
   • Code: base_fonter.py: __zero_cmaps
6. rle to shrink large blocks of zeros
   • Code: base_fonter.py: __rle

NOTE: the base is not compressed

closure_idx

Data about related / possibly-needed glyphs.

1. length is proportional to the number of glyphs (which is contiguous from 0 - (n-1))
2. offset & size of closure list in closure_data

• Code: closure.py: dump_closure_map

closure_data

Arrays of glyphs that might be used with a given glyph (ligatures, GSUB, etc).

1. array of possibly-needed glyphs

• Code: closure.py: dump_closure_map

codepoints

An array of the Unicode codepoints in the font

1. convert to an associative map codepoint:gid at runtime

• Code: preprocess.py: cmap_dump.

gids

The primary glyph for each codepoint in codepoints

• Code: proprocess.py: cmap_dump.

glyph_data

The per-glyph data.

1. exact same order and length as the font's glyph data

• Code: preprocess.py: serial_glyphs, _serial_Glyf/_serial_Cff

glyph_table

Array of glyphs' data.

1. offset
2. length
3. hmtx/lsb and/or vmtx/tsb

• Code: preprocess.py: serial_glyphs, _serial_Glyf/_serial_Cff