IDWriteFontFallbackBuilder.AddMapping

Undocumented in source but is binding to Windows. You might be able to learn more by searching the web for its name.
interface IDWriteFontFallbackBuilder
extern (Windows)
HRESULT
AddMapping
(
DWRITE_UNICODE_RANGE* Ranges
,,
const wchar** TargetFamilyNames
,,
IDWriteFontCollection FontCollection = null
,
const wchar* LocaleName = null
,
const WCHAR* BaseFamilyName = null
,
float Scale = 1
)

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