Just looked at SDL2_gfx source code. Because _gfx just calls SDL’s drawing methods, most of the update could be done with search and replace. I’m sure someone would do it, but the whole interface would change from ints to floats, so it’ll most likely be a new lib called SDL2_fgfx
Maybe, but I suspect that SDL2_gfx’s algorithms are not accurate enough for such an approach to give good results. There’s limited benefit in plotting to sub-pixel precision if the calculations of the paths of curves etc. are themselves accurate only to the nearest pixel (and probably not even that).