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edited Dec 21, 2021 at 0:59

Whython, 59⁵⁹ 57 bytes

f=lambda F,a,b,x=0,y=0:F[y][x%lenF[a-1][x%len(F[0])]+f(FF[a:],a,b,x+b,y+a)?0

Inputs a 2D array of booleans, and 2 integers.

f=lambda F,a,b,x=0:F[a-1:]>[]and F[a-1][x%len(F[0])]+f(F[a:],a,b,x+b)

f=lambda F,a,b,x=0,y=0:F[y][x%len(F[0])]+f(F,a,b,x+b,y+a)?0

Inputs a 2D array of booleans, and 2 integers

f=lambda F,a,b,x=0:F[a-1][x%len(F[0])]+f(F[a:],a,b,x+b)?0

Inputs a 2D array of booleans, and 2 integers.

f=lambda F,a,b,x=0:F[a-1:]>[]and F[a-1][x%len(F[0])]+f(F[a:],a,b,x+b)

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created Dec 21, 2021 at 0:47

f=lambda F,a,b,x=0,y=0:F[y][x%len(F[0])]+f(F,a,b,x+b,y+a)?0

Inputs a 2D array of booleans, and 2 integers