How to convert Rich Text RTF to plain or HTML in Delphi XE4?

问题

In Delphi XE4 FireMonkey, I have some RTF in a stream from a database. It uses only fonts, sizes, bold and italics.

How can I extract the plain text or convert it to HTML?

Can I somehow use JVCL's component(s) even though I'm using FireMonkey?

来源：https://stackoverflow.com/questions/21612243/how-to-convert-rich-text-rtf-to-plain-or-html-in-delphi-xe4