252 #define AVG3(a, b, c) (((a) + 2 * (b) + (c) + 2) >> 2)  macro
258     AVG3(top[-1], top[0], top[1]),  in VE4()
259     AVG3(top[ 0], top[1], top[2]),  in VE4()
260     AVG3(top[ 1], top[2], top[3]),  in VE4()
261     AVG3(top[ 2], top[3], top[4])  in VE4()
275   *(uint32_t*)(dst + 0 * BPS) = 0x01010101U * AVG3(A, B, C);  in HE4()
276   *(uint32_t*)(dst + 1 * BPS) = 0x01010101U * AVG3(B, C, D);  in HE4()
277   *(uint32_t*)(dst + 2 * BPS) = 0x01010101U * AVG3(C, D, E);  in HE4()
278   *(uint32_t*)(dst + 3 * BPS) = 0x01010101U * AVG3(D, E, E);  in HE4()
299   DST(0, 3)                                     = AVG3(J, K, L);  in RD4()
300   DST(0, 2) = DST(1, 3)                         = AVG3(I, J, K);  in RD4()
301   DST(0, 1) = DST(1, 2) = DST(2, 3)             = AVG3(X, I, J);  in RD4()
302   DST(0, 0) = DST(1, 1) = DST(2, 2) = DST(3, 3) = AVG3(A, X, I);  in RD4()
303   DST(1, 0) = DST(2, 1) = DST(3, 2)             = AVG3(B, A, X);  in RD4()
304   DST(2, 0) = DST(3, 1)                         = AVG3(C, B, A);  in RD4()
305   DST(3, 0)                                     = AVG3(D, C, B);  in RD4()
317   DST(0, 0)                                     = AVG3(A, B, C);  in LD4()
318   DST(1, 0) = DST(0, 1)                         = AVG3(B, C, D);  in LD4()
319   DST(2, 0) = DST(1, 1) = DST(0, 2)             = AVG3(C, D, E);  in LD4()
320   DST(3, 0) = DST(2, 1) = DST(1, 2) = DST(0, 3) = AVG3(D, E, F);  in LD4()
321   DST(3, 1) = DST(2, 2) = DST(1, 3)             = AVG3(E, F, G);  in LD4()
322   DST(3, 2) = DST(2, 3)                         = AVG3(F, G, H);  in LD4()
323   DST(3, 3)                                     = AVG3(G, H, H);  in LD4()
340   DST(0, 3) =             AVG3(K, J, I);  in VR4()
341   DST(0, 2) =             AVG3(J, I, X);  in VR4()
342   DST(0, 1) = DST(1, 3) = AVG3(I, X, A);  in VR4()
343   DST(1, 1) = DST(2, 3) = AVG3(X, A, B);  in VR4()
344   DST(2, 1) = DST(3, 3) = AVG3(A, B, C);  in VR4()
345   DST(3, 1) =             AVG3(B, C, D);  in VR4()
362   DST(0, 1) =             AVG3(A, B, C);  in VL4()
363   DST(1, 1) = DST(0, 3) = AVG3(B, C, D);  in VL4()
364   DST(2, 1) = DST(1, 3) = AVG3(C, D, E);  in VL4()
365   DST(3, 1) = DST(2, 3) = AVG3(D, E, F);  in VL4()
366               DST(3, 2) = AVG3(E, F, G);  in VL4()
367               DST(3, 3) = AVG3(F, G, H);  in VL4()
378   DST(1, 0) =             AVG3(I, J, K);  in HU4()
379   DST(3, 0) = DST(1, 1) = AVG3(J, K, L);  in HU4()
380   DST(3, 1) = DST(1, 2) = AVG3(K, L, L);  in HU4()
400   DST(3, 0)             = AVG3(A, B, C);  in HD4()
401   DST(2, 0)             = AVG3(X, A, B);  in HD4()
402   DST(1, 0) = DST(3, 1) = AVG3(I, X, A);  in HD4()
403   DST(1, 1) = DST(3, 2) = AVG3(J, I, X);  in HD4()
404   DST(1, 2) = DST(3, 3) = AVG3(K, J, I);  in HD4()
405   DST(1, 3)             = AVG3(L, K, J);  in HD4()
409 #undef AVG3