I just realized that SDL have two functions to blitting. One is SDL_BlitSurface and the second one is SDL_LowerBlit. Moreover, both of these functions have their scaled version (SDL_BlitScaled, SDL_LowerBlitScaled). What is difference between these two functions? Doc says that LowerBlit "perform a low-level surface blitting only". What should I present under this?
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The answer is in documentation under Remarks section of both functions.
SDL_LowerBlit:
SDL_BlitSurface: