对于SDL 1.x中,通过SDL_NOFRAME在flags参数SDL_SetVideoMode。
SDL_Surface * window = SDL_SetVideoMode(width, height, bpp, flags | SDL_NOFRAME);
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对于 SDL 2.x,SDL_WINDOW_BORDERLESS在SDL_CreateWindow.
SDL_Window * window = SDL_CreateWindow(title, x, y, width, height, flags | SDL_WINDOW_BORDERLESS);
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