I'm currently developing an automatic pdf document generator using LuaLatex. Unfortunately, the documents can contain arbitrary user-generated utf-8 text which results in "blank" output if the corresponding glyphs are not present in the selected font. Is there a (reasonable) way to avoid this?
Ideally, I would love to to be able to define a chain of fallback fonts. If that is not possible, another thing that would work for me would be to be able to associate character ranges to specific fonts. (eg. a font for the range of Chinese characters, another for Greek, ...). It is worth reminding that I have to deal with arbitrary text (i.e, Chinese names inside a Portuguese text) and font switching would need to happen on a char-by-char basis. Finally, if none of the above are possible, at least I would like to be able to produce a "char not supported" glyph or fallback to system fonts, instead of producing blank output. Thanks in advance! Ana
