_LV_DPX_CALC macro

DEFINES Same as Android's DIP. (Different name is chosen to avoid mistype between LV_DPI and LV_DIP) 1 dip is 1 px on a 160 DPI screen 1 dip is 2 px on a 320 DPI screen https://stackoverflow.com/questions/2025282/what-is-the-difference-between-px-dip-dp-and-sp