This command can be used to free the cached glyphs of either a specific
font or of all fonts currently in memory. If you want to free the cached
glyphs of a specific font, you have to set the mode argument to 1 and
pass the identifier of the font in the optional id argument. If you
want to free the glyph cache of all loaded fonts, simply pass 0 in the
mode argument.
Inputs
mode
set this to 1 to free the glyph cache of the font specified in
argument 2 or to 0 to free the glyph cache of all fonts
id
optional: identifier of the font whose glyph cache shall be
cleared (mode must be set to 1 if this is used)