GetThresholdMapFile  589 magick/methods.h #define GetThresholdMapFile  PrependMagickMethod(GetThresholdMapFile)
GetThresholdMapFile 1150 magick/threshold.c   map=GetThresholdMapFile(MinimalThresholdMap,"built-in",map_id,exception);
GetThresholdMapFile 1157 magick/threshold.c     map=GetThresholdMapFile((const char *) GetStringInfoDatum(option),