[SDL] 8-bit to 8-bit blits

[Sam Lantinga]

> If my main video surface is 8-bits deep, and I try to SDL_BlitSurface 
> from a different 8-bit surface (with a different color table) into the 
> main surface, nothing gets copied. But if I call SDL_DisplayFormat 
> first, it works fine.

> Is this to be expected? Is there a more efficient way to blit between 
> 8-bit surfaces than creating an intermediary surface?

It should work.  It sounds like one of the palettes is empty.

See ya,
	-Sam Lantinga, Senior Software Engineer, Blizzard Entertainment