Manpages - FcDefaultSubstitute.3

FcDefaultSubstitute - Perform default substitutions in a pattern

#include <fontconfig/fontconfig.h>

void FcDefaultSubstitute (FcPattern pattern);*

Supplies default values for underspecified font patterns:

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Patterns without a specified style or weight are set to Medium

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Patterns without a specified style or slant are set to Roman

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Patterns without a specified pixel size are given one computed from any specified point size (default 12), dpi (default 75) and scale (default 1).