For last 2 years (2018-) I've been using
emacs -xrm Xft.embolden:true -fn Hack-13
to start emacs w/ suitable sized and 'brightness'ed fonts for me in my systems.
What that does gives extra boldness to font glyphs in every weights used.
That has worked fine with emacs 25 and 26 (and could work w/ emacs 24, too...)
Now since I upgraded to emacs 27.1 (in 3 fedora systems I have) the extra bolding supposed be given by that
embolden does not have any effect anymore...
probably due to the great technology called HarfBuzz(?)
[[edit 2020-09-17 -- use of Cairo instead of HarfBuzz is more probable cause for this, thanks for comment for me to think outside of this -- compared output of (emacs-version) in versions 26.3 and 27.1 of emacs and latter mentioned "cairo"]]
urxvt I use
-fn xft:Hack-13:embolden ->
emacs -fn Hack-13:embolden makes no difference.
emacs -fn Hack-13:weight=bold does bold the "regular" weighted fonts but does not make "bold" fonts any bolder (like
What are my options? I hope I don't have to resort to recompile Hack fonts with extra boldness to begin with ;/