macros.h

H.263+(VC++商业源代码)

#define sign(a)  	((a) < 0 ? -1 : 1)
#define Int(a)          ((a) < 0 ? (int)(a-0.5) : (int)(a))
#define mnint(a)	((a) < 0 ? (int)(a - 0.5) : (int)(a + 0.5))
#define mfloor(a)       ((a) < 0 ? (int)(a - 0.5) : (int)(a))
#define mmax(a, b)  	((a) > (b) ? (a) : (b))
#define mmin(a, b)  	((a) < (b) ? (a) : (b))
#define limit(x) \
{ \
    if (x > 255) x = 255; \
    if (x <   0)   x = 0; \
}