[SDL] Optimal mode from SDL_GetVideoMode

[benang at cs.its.ac.id]

Hi, I've recently tried to find the optimal mode from SDL_GetVideoMode.
The result is all the accelerations(hw_available, blit_hw, blit_hw_CC,
blit_hw_A, blit_sw, blit_sw_CC, blit_sw_A, blit_fill) are valued 0. So, is
it better to use the flag SDL_HWSURFACE or SDL_SWSURFACE? What is the
optimal flag if I wanted to use either colorkey or alpha blending? And why
is the video_mem value always returned zero?