moved inner-loop into its own function(s).  This can give a measurable performance increase, with clang and -Ofast.
moved inner-loop into its own function(s).  This can give a measurable performance increase, with clang and -Ofast.

DavidLudwig/DL_Raster,DavidLudwig/DL_Raster,DavidLudwig/DLRaster