In Direct Draw, do blit a off-screen surface directly to primary surface
The Blt method performs blits in all directions.
Bltfast however can only by used when blitting from and to
When useing hardware accelleration (like in most cases) there wont be
speed difference between the two, so just use the Blt method.
Is there a way to get DirectDraw to blit 8-bit surfaces into a 16-bit
surface? Developing a custom blitter for this purpose would lose the
advantage of hardware acceleration with DirectDraw. Also, it would seem
that DirectDraw has no capability for blitting compressed imagery straight
into the primary surface, which means another custom blitter and no
11. Primary surface