G.2 Font and font backend selection on Haiku

Emacs, when built with Haiku windowing support, can be built with several different font backends. You can specify font backends by specifying -xrm Emacs.fontBackend:BACKEND on the command line used to invoke Emacs, where BACKEND is one of the backends specified below, or on a per-frame basis by changing the font-backend frame parameter.

Two of these backends, ftcr and ftcrhb are identical to their counterparts on the X Window System. There is also a Haiku-specific backend named haiku, that uses the App Server to draw fonts, but does not at present support display of color font and emoji.