[SDL] [Update] Can anyone please tell me what's wrong with this code?

[Laurent Carlier]

Le mercredi 9 août 2006 06:59, L-28C a écrit :
> OK, after some fiddling around, I changed the initialization of 'bmp' to
> this:
>
> =<Code>=================
> this->vehicles[0].bmp = SDL_CreateRGBSurface(SDL_HWSURFACE, 96, 96, 32,
> 0, 0, 0, 0);
> =</Code>================
>
> It works!  But then I get a black background (initial reason to use the
> transparent image file)...  How can I fix this?  Thanks!
>
> L-28C wrote:
> > Hello everyone!
> > OK, here's the code:
> >
> > =<Code>=================
> > bool Game::t_DrawVehicle()
> > {
> > 	SDL_Rect src, dest;
> > 	src.w = 96;
> > 	src.h = 96;
> >
> > 	dest.w = 96;
> > 	dest.h = 96;
> > 	dest.x = 0;
> > 	dest.y = 0;
> >
> > 	// Layer 1
> > 	src.x = 0;
> > 	src.y = 0;
> > 	SDL_BlitSurface(this->vehicles[0].layers, &src, this->vehicles[0].bmp,
> > &dest);
> >
> > 	SDL_UpdateRect(this->vehicles[0].bmp, 0, 0, 96, 96);
> >
> > 	return true;
> > }
> > =</Code>================
> >
> > The blit isn't working...  Here's the declaration of both surfaces
> > (they're not on the same func):
> >
> > =<Code>=================
> > this->vehicles[0].layers = IMG_Load("./Graphics/Vehicles/AZX-2400.PNG");
> > //192x192
> >
> > this->vehicles[0].bmp = IMG_Load("./Graphics/Transparent 96x96
> > Image.png"); //96x96
> > =</Code>================
> >
> > The 'layers' one works, because I can display it to the screen, but
> > 'bmp' just displays the original image it had... ("Transparent 96x96
> > Image.png", just a transparent box with a black pixel in the middle...)
> >
> > Does anyone know why it's happening?  Thanks very much!

Try to enable alpha with SDL_SetAlpha

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