Provided by: libfontconfig-doc_2.13.1-4.2ubuntu5_all 

NAME
FcDefaultSubstitute - Perform default substitutions in a pattern
SYNOPSIS
#include <fontconfig/fontconfig.h>
void FcDefaultSubstitute (FcPattern *pattern);
DESCRIPTION
Supplies default values for underspecified font patterns:
• Patterns without a specified style or weight are set to Medium
• Patterns without a specified style or slant are set to Roman
• Patterns without a specified pixel size are given one computed from any specified point size (default
12), dpi (default 75) and scale (default 1).
Fontconfig 2.13.1 23 March 2022 FcDefaultSubstitute(3)