[SDL] maximized->fullscreen?

[梦影幻忆]

OS:windows10 SDL:v2.0.5
Desktop resolution:1920x1080
SDL resolution:960x540

Just use SDL_SetWindowFullscreen(SDL_WINDOW_HIDDEN and SDL_WINDOW_FULLSCREEN) , no more.

First:
SDL_SetWindowFullscreen(???,SDL_WINDOW_FULLSCREEN);//right

Second:
SDL_SetWindowFullscreen(???,SDL_WINDOW_HIDDEN );//right

Third:
SDL_SetWindowFullscreen(???,SDL_WINDOW_FULLSCREEN);//right

Fourth:
SDL_SetWindowFullscreen(???,SDL_WINDOW_HIDDEN );//error

I don't know why.
registration window style have been changed, and sdl resolution not is 960x540 , look like 800x600,maybe.
So I cancelled full screen function.

[梦影幻忆]

And SDL_SetWindowPosition(???, SDL_WINDOWPOS_CENTERED, SDL_WINDOWPOS_CENTERED) failure.