MapCharactersHRESULT MapCharacters(IDWriteTextAnalysisSource Source, uint TextPosition, uint TextLength, IDWriteFontCollection BaseFontCollection, wchar* BaseFamilyName, DWRITE_FONT_WEIGHT BaseWeight, DWRITE_FONT_STYLE BaseStyle, DWRITE_FONT_STRETCH BaseStretch, uint* MappedLength, IDWriteFont* MappedFont, float* Scale)