FcFontRenderPrepare − Prepare pattern for loading font file

#include <fontconfig.h>

FcPattern * FcFontRenderPrepare (FcConfig *config, FcPattern
*pat, FcPattern *font);

     Creates a new pattern consisting of elements of font
not appearing in pat, elements of pat not appearing in font
and the best matching value from pat for elements appearing
in both.  The result is passed to FcConfigSubstitute with
kind FcMatchFont and then returned.

     Fontconfig version 2.4.2