[SDL] Converting PNG's

[Patricia Curtis]

Hi
   I have noticed that if i convert surfaces to screen->format, i get a huge
increase in speed from my game, which works fine for the backgrounds.

i am using PNG images for my sprites as they give me nice anti aliased edges
but when i use SDL_ConvertSurface on the PNG's i lose my transparency's,
so how can i convert the sprites to screen->format and still retain the
transparency and the anti-aliasing on the edges?
Many Thanks

Trish
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