in fullscreen mode, you do flipping. in windowed mode, https://gameprogrammingpatterns.com/double-buffer.html https://gameprogrammingpatterns.com/double-buffer.

in fullscreen mode, you do flipping. in windowed mode, https://gameprogrammingpatterns.com/double-buffer.html https://gameprogrammingpatterns.com/double-buffer.html you do blitting. https://en.wikipedia.org/wiki/Bit_blit https://en.wikipedia.org/wiki/Bit_blit