338 #define AVG3(a, b, c) (((a) + 2 * (b) + (c) + 2) >> 2)  macro
343     AVG3(top[-1], top[0], top[1]),  in VE4()
344     AVG3(top[ 0], top[1], top[2]),  in VE4()
345     AVG3(top[ 1], top[2], top[3]),  in VE4()
346     AVG3(top[ 2], top[3], top[4])  in VE4()
360   WebPUint32ToMem(dst + 0 * BPS, 0x01010101U * AVG3(X, I, J));  in HE4()
361   WebPUint32ToMem(dst + 1 * BPS, 0x01010101U * AVG3(I, J, K));  in HE4()
362   WebPUint32ToMem(dst + 2 * BPS, 0x01010101U * AVG3(J, K, L));  in HE4()
363   WebPUint32ToMem(dst + 3 * BPS, 0x01010101U * AVG3(K, L, L));  in HE4()
383   DST(0, 3)                                     = AVG3(J, K, L);  in RD4()
384   DST(0, 2) = DST(1, 3)                         = AVG3(I, J, K);  in RD4()
385   DST(0, 1) = DST(1, 2) = DST(2, 3)             = AVG3(X, I, J);  in RD4()
386   DST(0, 0) = DST(1, 1) = DST(2, 2) = DST(3, 3) = AVG3(A, X, I);  in RD4()
387   DST(1, 0) = DST(2, 1) = DST(3, 2)             = AVG3(B, A, X);  in RD4()
388   DST(2, 0) = DST(3, 1)                         = AVG3(C, B, A);  in RD4()
389   DST(3, 0)                                     = AVG3(D, C, B);  in RD4()
401   DST(0, 0)                                     = AVG3(A, B, C);  in LD4()
402   DST(1, 0) = DST(0, 1)                         = AVG3(B, C, D);  in LD4()
403   DST(2, 0) = DST(1, 1) = DST(0, 2)             = AVG3(C, D, E);  in LD4()
404   DST(3, 0) = DST(2, 1) = DST(1, 2) = DST(0, 3) = AVG3(D, E, F);  in LD4()
405   DST(3, 1) = DST(2, 2) = DST(1, 3)             = AVG3(E, F, G);  in LD4()
406   DST(3, 2) = DST(2, 3)                         = AVG3(F, G, H);  in LD4()
407   DST(3, 3)                                     = AVG3(G, H, H);  in LD4()
424   DST(0, 3) =             AVG3(K, J, I);  in VR4()
425   DST(0, 2) =             AVG3(J, I, X);  in VR4()
426   DST(0, 1) = DST(1, 3) = AVG3(I, X, A);  in VR4()
427   DST(1, 1) = DST(2, 3) = AVG3(X, A, B);  in VR4()
428   DST(2, 1) = DST(3, 3) = AVG3(A, B, C);  in VR4()
429   DST(3, 1) =             AVG3(B, C, D);  in VR4()
446   DST(0, 1) =             AVG3(A, B, C);  in VL4()
447   DST(1, 1) = DST(0, 3) = AVG3(B, C, D);  in VL4()
448   DST(2, 1) = DST(1, 3) = AVG3(C, D, E);  in VL4()
449   DST(3, 1) = DST(2, 3) = AVG3(D, E, F);  in VL4()
450               DST(3, 2) = AVG3(E, F, G);  in VL4()
451               DST(3, 3) = AVG3(F, G, H);  in VL4()
462   DST(1, 0) =             AVG3(I, J, K);  in HU4()
463   DST(3, 0) = DST(1, 1) = AVG3(J, K, L);  in HU4()
464   DST(3, 1) = DST(1, 2) = AVG3(K, L, L);  in HU4()
484   DST(3, 0)             = AVG3(A, B, C);  in HD4()
485   DST(2, 0)             = AVG3(X, A, B);  in HD4()
486   DST(1, 0) = DST(3, 1) = AVG3(I, X, A);  in HD4()
487   DST(1, 1) = DST(3, 2) = AVG3(J, I, X);  in HD4()
488   DST(1, 2) = DST(3, 3) = AVG3(K, J, I);  in HD4()
489   DST(1, 3)             = AVG3(L, K, J);  in HD4()
505 #undef AVG3