Commit Graph

5 Commits

Author SHA1 Message Date
Garret Rieger 95329081c2 [subset] further optimize cmap4 packing. 2021-11-28 07:47:49 -07:00
Garret Rieger 599143824c [subset] Don't pad glyphs when using long loca. 2021-11-26 18:01:04 -07:00
Garret Rieger d9660fd58a [subset] Make cmap4 packing more optimal.
The current CMAP4 implementation uses whatever the current codepoint ranges are and then encodes them as indivudal glyph ids or as a delta if possible. However, it's often possible to save bytes by splitting up existing ranges and encoding parts of them using deltas where the cost of splitting the range is less than encoding each glyph individual.
2021-11-26 13:21:50 -07:00
Garret Rieger 49c9392412 [subset] During LigatureSubstFormat1 subsetting always place Coverage last.
In Windows 7 on Chrome if the coverage table comes before any of the LigatureSet or Ligature subtables the font won't load. This changes the packing order to always place the Coverage table last. Virtual links are used to ensure the repacker maintains the desired ordering.

Coincidentally fontTools also does the same thing (a3f988fbf6/Lib/fontTools/ttLib/tables/otTables.py (L1137)) to reduce overflows during packing.
2021-11-02 12:19:13 -06:00
Qunxin Liu 37379f8f7d [subset] fox for (Chain)ContextFormat3: subset lookupRecord
skip copying a lookupRecord if lookup referenced in the lookupRecord is
not retained after subset
2021-09-08 13:55:21 -06:00