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otlLib: Routines for working with OpenType Layout
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The `` fontTools.otlLib `` library provides routines to help you create the
subtables and other data structures you need when you are editing a font's
`` GSUB `` and `` GPOS `` tables: substitution and positioning rules, anchors,
lookups, coverage tables and so on.
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High-level OpenType Layout Lookup Builders
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.. automodule :: fontTools.otlLib.builder
:members: AlternateSubstBuilder, ChainContextPosBuilder, ChainContextSubstBuilder, LigatureSubstBuilder, MultipleSubstBuilder, CursivePosBuilder, MarkBasePosBuilder, MarkLigPosBuilder, MarkMarkPosBuilder, ReverseChainSingleSubstBuilder, SingleSubstBuilder, ClassPairPosSubtableBuilder, PairPosBuilder, SinglePosBuilder
:member-order: bysource
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Common OpenType Layout Data Structures
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.. automodule :: fontTools.otlLib.builder
:members: buildCoverage, buildLookup
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Low-level GSUB Table Lookup Builders
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These functions deal with the "simple" lookup types. See above for classes to
help build more complex lookups (contextual and chaining lookups).
.. automodule :: fontTools.otlLib.builder
:members: buildSingleSubstSubtable, buildMultipleSubstSubtable, buildAlternateSubstSubtable, buildLigatureSubstSubtable
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GPOS Shared Table Builders
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The functions help build the `GPOS shared tables <https://docs.microsoft.com/en-us/typography/opentype/spec/gpos#shared-tables-value-record-anchor-table-and-mark-array-table> `_
as defined in the OpenType spec: value records, anchors, mark arrays and
mark record tables.
.. automodule :: fontTools.otlLib.builder
:members: buildValue, buildAnchor, buildMarkArray, buildDevice, buildBaseArray, buildComponentRecord, buildMarkArray, buildValue
:member-order: bysource
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Low-level GPOS Table Lookup Builders
------------------------------------
These functions deal with the "simple" lookup types. See above for classes to
help build more complex lookups (contextual and chaining lookups).
.. automodule :: fontTools.otlLib.builder
:members: buildCursivePosSubtable, buildLigatureArray, buildMarkBasePos, buildMarkBasePosSubtable, buildMarkLigPos, buildMarkLigPosSubtable, buildPairPosClassesSubtable, buildPairPosGlyphs, buildPairPosGlyphsSubtable, buildSinglePos, buildSinglePosSubtable
:member-order: bysource
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GDEF Table Subtable Builders
----------------------------
These functions build subtables for elements of the `` GDEF `` table.
.. automodule :: fontTools.otlLib.builder
:members: buildAttachList, buildLigCaretList, buildMarkGlyphSetsDef
:member-order: bysource
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STAT Table Builder
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.. automodule :: fontTools.otlLib.builder
:members: buildStatTable
:member-order: bysource
