THotPDF GSUB Script and Language Methods

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THotPDF API reference

THotPDF Methods Auto Shaping GSUB

Selects and discovers the OpenType GSUB ScriptList, LangSys, and FeatureList entries used by all GSUB lookup queries

Delphi syntax

procedure SetGSUBScript(const ScriptTag: AnsiString);

procedure SetGSUBLanguage(const LangTag: AnsiString);

function GetGSUBScripts: TGSUBStringArray;

function GetGSUBLanguages(const ScriptTag: AnsiString): TGSUBStringArray;

function GetGSUBFeatures(const ScriptTag, LangTag: AnsiString): TGSUBStringArray;

Covered APIs

API	Usage notes
`SetGSUBScript`	Selects the OpenType script tag used by later GSUB feature and lookup queries
`SetGSUBLanguage`	Selects the OpenType language-system tag and falls back to the script default when unavailable, matching common OpenType behaviour
`GetGSUBScripts`	Returns the script tags advertised by the registered Unicode font's GSUB ScriptList
`GetGSUBLanguages`	Returns the language-system tags available for a script tag
`GetGSUBFeatures`	Returns the feature tags reachable for a script and language-system pair

Usage notes

SetGSUBScript is strict: an unknown script tag makes later queries return no-op results. SetGSUBLanguage falls back to the script default LangSys when the requested language tag is unavailable, matching common OpenType behaviour