freetype problem

Freetype generated using the word in all platforms, such as WINDOWS, LINUX, MAC, IOS, ANDROID, the same code, the size of the display are not the same. In FREETYPE official example2.cpp example, it will generate a stroke character picture is pure C code, not the same across platforms, do not know if anyone can answer this question, I hope the same code, the display can be consistent
Reply:
Different file systems are not the same, certainly not the same space; since storage has a minimum storage units;
But the actual size should be the same.