IDWriteFontFace1.GetVerticalGlyphVariants

Undocumented in source but is binding to Windows. You might be able to learn more by searching the web for its name.
interface IDWriteFontFace1
extern (Windows)
HRESULT
GetVerticalGlyphVariants
(
uint Count
,
const ushort* NominalGlyphIndices
,)

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