[SDL] Loading bitmaps with transparency? (Torsten Giebl)

[Patricia Curtis]

Its simple to use transparency just save your images as a PNG-24 which will
give you 255 levels of transparency and you don't have to do the colour
keying either.

SDL_Surface * gLoadedImage = SDL_DisplayFormatAlpha(IMG_Load("SomePNG.png"
));

i use it for my sprites, i anti alias the edges and save png in photo shop,
save for web is best for reducing the size of images. then when i blit them
i use.

SDL_BlitSurface(gLoadedImage , &SrcRect ,gScreen , &DestRect);

And just to make this complete i create my screen with

gScreen = SDL_SetVideoMode(ScreenWidth, ScreenHeight, 32, SDL_HWSURFACE |
SDL_FULLSCREEN | SDL_DOUBLEBUF | SDL_ANYFORMAT);

So PNG image Blitted to screen transparent with anti alias edges.
yeah everyone else i know this is basic simple stuff but hey just trying to
take part in the group.

Have fun

Trish
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