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| """ | |
| Define all configuration options that can affect the working of fontTools | |
| modules. E.g. optimization levels of varLib IUP, otlLib GPOS compression level, | |
| etc. If this file gets too big, split it into smaller files per-module. | |
| An instance of the Config class can be attached to a TTFont object, so that | |
| the various modules can access their configuration options from it. | |
| """ | |
| from textwrap import dedent | |
| from fontTools.misc.configTools import * | |
| class Config(AbstractConfig): | |
| options = Options() | |
| OPTIONS = Config.options | |
| Config.register_option( | |
| name="fontTools.otlLib.optimize.gpos:COMPRESSION_LEVEL", | |
| help=dedent( | |
| """\ | |
| GPOS Lookup type 2 (PairPos) compression level: | |
| 0 = do not attempt to compact PairPos lookups; | |
| 1 to 8 = create at most 1 to 8 new subtables for each existing | |
| subtable, provided that it would yield a 50%% file size saving; | |
| 9 = create as many new subtables as needed to yield a file size saving. | |
| Default: 0. | |
| This compaction aims to save file size, by splitting large class | |
| kerning subtables (Format 2) that contain many zero values into | |
| smaller and denser subtables. It's a trade-off between the overhead | |
| of several subtables versus the sparseness of one big subtable. | |
| See the pull request: https://github.com/fonttools/fonttools/pull/2326 | |
| """ | |
| ), | |
| default=0, | |
| parse=int, | |
| validate=lambda v: v in range(10), | |
| ) | |
| Config.register_option( | |
| name="fontTools.ttLib.tables.otBase:USE_HARFBUZZ_REPACKER", | |
| help=dedent( | |
| """\ | |
| FontTools tries to use the HarfBuzz Repacker to serialize GPOS/GSUB tables | |
| if the uharfbuzz python bindings are importable, otherwise falls back to its | |
| slower, less efficient serializer. Set to False to always use the latter. | |
| Set to True to explicitly request the HarfBuzz Repacker (will raise an | |
| error if uharfbuzz cannot be imported). | |
| """ | |
| ), | |
| default=None, | |
| parse=Option.parse_optional_bool, | |
| validate=Option.validate_optional_bool, | |
| ) | |
| Config.register_option( | |
| name="fontTools.otlLib.builder:WRITE_GPOS7", | |
| help=dedent( | |
| """\ | |
| macOS before 13.2 didn’t support GPOS LookupType 7 (non-chaining | |
| ContextPos lookups), so FontTools.otlLib.builder disables a file size | |
| optimisation that would use LookupType 7 instead of 8 when there is no | |
| chaining (no prefix or suffix). Set to True to enable the optimization. | |
| """ | |
| ), | |
| default=False, | |
| parse=Option.parse_optional_bool, | |
| validate=Option.validate_optional_bool, | |
| ) | |