[Allegro 5] Kolizje per pixel

bool check_collision( std::vector < SDL_Rect > & A, std::vector < SDL_Rect > & B )
{
    //The sides of the rectangles
    int leftA, leftB;
    int rightA, rightB;
    int topA, topB;
    int bottomA, bottomB;
   
    //Go through the A boxes
    for( int Abox = 0; Abox < A.size(); Abox++ )
    {
        //Calculate the sides of rect A
        leftA = A[ Abox ].x;
        rightA = A[ Abox ].x + A[ Abox ].w;
        topA = A[ Abox ].y;
        bottomA = A[ Abox ].y + A[ Abox ].h;
       
        //Go through the B boxes   
        for( int Bbox = 0; Bbox < B.size(); Bbox++ )
        {
            //Calculate the sides of rect B
            leftB = B[ Bbox ].x;
            rightB = B[ Bbox ].x + B[ Bbox ].w;
            topB = B[ Bbox ].y;
            bottomB = B[ Bbox ].y + B[ Bbox ].h;
           
            //If no sides from A are outside of B
            if((( bottomA <= topB ) ||( topA >= bottomB ) ||( rightA <= leftB ) ||( leftA >= rightB ) ) == false )
            {
                //A collision is detected
                return true;
            }
        }
    }
   
    //If neither set of collision boxes touched
    return false;
}