Convert 8 bit values to 32 bit

[crossley7]

I'm using Dev C++ with the G++ compiler. I am trying to create a program that reads in a bmp and converts the pixel colours to the opposite ie black becomes white.

code:

Uint8 r,g,b,a; Uint32 pixel = get_pixel32( surface, x, y ); SDL_GetRGBA (pixel, surface->format, &r, &g, &b, &a); r = (Uint8)255 - r; g = (Uint8)255 - g; b = (Uint8)255 - b; a = (Uint8)255 - a; pixel =(Uint8)r*1000000+(Uint8)b*10000+(Uint8)g*100+(Uint8)a;

I know that the last line is horribly wrong, but I have no idea as to what it should actually be.

[Tony]

You might be looking for http://en.wikipedia.org/wiki/Logical_shift

[Raknarg]

Your probably looking for this too ;P http://en.wikipedia.org/wiki/List_of_Latin_phrases:_I#id_est

[crossley7]

Thanks, that is a lot of help, but I'm not sure how to implement it, but will keep working on it to see if i can figure it out