MPLAB Harmony Graphics Configurator generates application and library code based on the graphics library selected. This is considered middleware code. MHC will parse all graphics middleware components and produce project specific code for the UI design. 

Middleware code produced is specific to the graphics library selected. If the code is modified by the user outside of MHC, difference will be produced on the next generation. 

No code is generated when using the blank graphics library. 

The MHC code repository for graphics files is: 

firmware/src/config/<config>gfx 

data is generated the same way as the rest of the project within MHC; it is through the Generate button.