#include <fontconfig/fontconfig.h> double FcWeightToOpenTypeDouble (doubleot_weight);
FcWeightToOpenTypeDouble is the inverse of FcWeightFromOpenType. If the input is less than FC_WEIGHT_THIN or greater than FC_WEIGHT_EXTRABLACK, returns -1. Otherwise returns a number in the range 1 to 1000.
version 2.12.92