Hello Alexei,
*> Using signed char is a bit problematic because the FT_Bitmap buffer is > unsigned char. Going from signed to unsigned is well-defined, but > backwards is implementation-defined.* I'm assuming here that `FT_Bitmap` is simply a typeless buffer and the client can do a pointer cast ( like: FT_Char* buff = (FT_Char*)buffer ) to get the values without modifying/casting each and every value. *> Can we simply map distances like this? > > SDF = 128 * ( distance - spread ) / spread; > > assuming positive values outside and clamping to [0,255] * Mapping the buffer to any range is fine as long as the client can figure out where the actual edge is. In the current implementation the edge is at `0`. So if we map the [-128, 127] range to [0, 255], the values from [0, 127] will be `inside` and values [129, 255] will be `outside` with the edge being at 128. Thanks, Anuj
