[Need Help] C++: Colour Clicker

I can't find a way to move the move over a specific colour or pixel in C++. I know the language fairly well, I'm still a bit of a beginner, I've been using
setcursorpos() for some things but it's useless for cheating on games where the objects move (counter-strike aimbot, monster clicker, etc.) Anyone know how I can make a better clicker?

 

Code:

bool FindColor(long color, int XS, int YS, int XF, int YF)
{
	HDC dc1;
	int x,y;
	//bool found = false;
	dc1 = GetDC(NULL);
	for(y = YS; y < YF; y++){
		for(x = XS; x < XF; x++){
			if(GetPixel(dc1,x,y)==color){
				SetCursorPos(x,y);
				return true;
			}
		}
	}
	return false;
}

Be warned, though, this method is very slow.

 

Cool, thanks! That's gonna help me a ton. How slow is it :/