1""" 2Define all configuration options that can affect the working of fontTools 3modules. E.g. optimization levels of varLib IUP, otlLib GPOS compression level, 4etc. If this file gets too big, split it into smaller files per-module. 5 6An instance of the Config class can be attached to a TTFont object, so that 7the various modules can access their configuration options from it. 8""" 9from textwrap import dedent 10 11from fontTools.misc.configTools import * 12 13 14class Config(AbstractConfig): 15 options = Options() 16 17 18OPTIONS = Config.options 19 20 21Config.register_option( 22 name="fontTools.otlLib.optimize.gpos:COMPRESSION_LEVEL", 23 help=dedent( 24 """\ 25 GPOS Lookup type 2 (PairPos) compression level: 26 0 = do not attempt to compact PairPos lookups; 27 1 to 8 = create at most 1 to 8 new subtables for each existing 28 subtable, provided that it would yield a 50%% file size saving; 29 9 = create as many new subtables as needed to yield a file size saving. 30 Default: 0. 31 32 This compaction aims to save file size, by splitting large class 33 kerning subtables (Format 2) that contain many zero values into 34 smaller and denser subtables. It's a trade-off between the overhead 35 of several subtables versus the sparseness of one big subtable. 36 37 See the pull request: https://github.com/fonttools/fonttools/pull/2326 38 """ 39 ), 40 default=0, 41 parse=int, 42 validate=lambda v: v in range(10), 43) 44 45Config.register_option( 46 name="fontTools.ttLib.tables.otBase:USE_HARFBUZZ_REPACKER", 47 help=dedent( 48 """\ 49 FontTools tries to use the HarfBuzz Repacker to serialize GPOS/GSUB tables 50 if the uharfbuzz python bindings are importable, otherwise falls back to its 51 slower, less efficient serializer. Set to False to always use the latter. 52 Set to True to explicitly request the HarfBuzz Repacker (will raise an 53 error if uharfbuzz cannot be imported). 54 """ 55 ), 56 default=None, 57 parse=Option.parse_optional_bool, 58 validate=Option.validate_optional_bool, 59) 60