micropython/tests/perf_bench/misc_mandel.py

# Compute the Mandelbrot set, to test complex numbers


def mandelbrot(w, h):
    def in_set(c):
        z = 0
        for i in range(32):
            z = z * z + c
            if abs(z) > 100:
                return i
        return 0

    img = bytearray(w * h)

    xscale = (w - 1) / 2.4
    yscale = (h - 1) / 3.2
    for v in range(h):
        line = memoryview(img)[v * w : v * w + w]
        for u in range(w):
            c = in_set(complex(v / yscale - 2.3, u / xscale - 1.2))
            line[u] = c

    return img


bm_params = {
    (100, 100): (20, 20),
    (1000, 1000): (80, 80),
    (5000, 1000): (150, 150),
}


def bm_setup(ps):
    return lambda: mandelbrot(ps[0], ps[1]), lambda: (ps[0] * ps[1], None)