x-list-fonts

x-list-fonts is a built-in function in `C source code'.

(x-list-fonts PATTERN &optional FACE FRAME MAXIMUM WIDTH)

Return a list of the names of available fonts matching PATTERN.
If optional arguments FACE and FRAME are specified, return only fonts
the same size as FACE on FRAME.

PATTERN should be a string containing a font name in the XLFD,
Fontconfig, or GTK format. A font name given in the XLFD format may
contain wildcard characters:
the * character matches any substring, and
the ? character matches any single character.
PATTERN is case-insensitive.

The return value is a list of strings, suitable as arguments to
`set-face-font'.

Fonts Emacs can't use may or may not be excluded
even if they match PATTERN and FACE.
The optional fourth argument MAXIMUM sets a limit on how many
fonts to match. The first MAXIMUM fonts are reported.
The optional fifth argument WIDTH, if specified, is a number of columns
occupied by a character of a font. In that case, return only fonts
the WIDTH times as wide as FACE on FRAME.