inline bool Odd(int val)	  	{return val%2;}
inline bool Even(int val) 	  	{return !Odd(val);}
inline int RoundEven(int val) 		{return Even(val) ? val : val+1;}
template<class T>
inline int Sign(T a) 			{return (a > 0) - (a < 0);}

inline const RGBA *GetPixel(const Image &img, int x, int y) {
	return img + x + y*img.GetWidth();
}
inline RGBA *GetPixel(ImageBuffer &img, int x, int y) {
	return img + x + y*img.GetWidth();
}