THotPDF GSUB Lookup Methods

THotPDF API 參考

本頁說明與 GSUB lookup methods 相關的 API 群組。型別名稱、方法名稱與 Delphi 語法保留原文，方便直接對照原始碼

Delphi 語法

function GetSingleSubstituteGlyph(InputGID: Word; const FeatureTag: AnsiString): Word;

function GetMultipleSubstituteGlyphs(InputGID: Word; const FeatureTag: AnsiString; var OutGIDs: TGSUBLookupArray): Boolean;

function GetAlternateGlyphCount(InputGID: Word; const FeatureTag: AnsiString): Integer;

function GetAlternateGlyph(InputGID: Word; const FeatureTag: AnsiString; AlternateIndex: Integer): Word;

function ApplyLigatureSubstitution(const InputGIDs: array of Word; StartIndex: Integer; const FeatureTag: AnsiString; out OutGID: Word; out ConsumedCount: Integer): Boolean;

function ApplyContextualSubst(const InputGIDs: array of Word; StartIndex: Integer; const FeatureTag: AnsiString; var OutGIDs: TGSUBLookupArray; out ConsumedLen: Integer): Boolean;

function ApplyReverseChainedContextualSubst(const InputGIDs: array of Word; StartIndex: Integer; const FeatureTag: AnsiString; out OutGID: Word): Boolean;

function ApplyGSUBContextualFeature(const Wide: UnicodeString; const AFeatureTag: AnsiString): UnicodeString;

function ApplyLocalizedForms(const Wide: UnicodeString): UnicodeString;

涵蓋的 API

使用說明

請在註冊合適的 Unicode 字型之後、輸出文字之前使用這些 API。如果字型沒有宣告所需的 OpenType 表，查詢會回傳安全的無操作結果，或讓輸出路徑回到較簡單的行為

另請參閱: OpenType GSUB Engine GSUB script and language methods ShapingFeatures Subset and mapping methods