#include <fontconfig/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 FcConfigSubstituteWithPat with kind FcMatchFont and then returned.
Fontconfig version 2.11.0