sdl 2 - What is the difference: SDL_FillRect VS SDL_RenderFillRect?

Question

What is difference between these two functions:

SDL_FillRect VS SDL_RenderFillRect

Answer 1

SDL_FillRect() operates on a SDL_Surface completely CPU-side, SDL_RenderFillRect() operates on a SDL_Renderer and may or may not be hardware accelerated depending on how the SDL_Renderer was created.