trezor-firmware/core/tools/codegen/gen_loader.py

#!/usr/bin/env python3

# script used to generate /embed/extmod/modtrezorui/loader.h

import math

outer = 60
inner = 42

with open("loader.h", "wt") as f:
    f.write("static const int img_loader_size = %d;\n" % outer)
    f.write("static const uint16_t img_loader[%d][%d] = {\n" % (outer, outer))
    for y in range(outer):
        f.write("    {")
        for x in range(outer):
            d = math.sqrt((outer - 1 - x) ** 2 + (outer - 1 - y) ** 2)
            c = {}
            for i in [5, 15]:
                if (inner - 0.5 <= d) and (d <= inner + 0.5):
                    c[i] = 15 * (d - inner + 0.5)
                elif (inner + 0.5 <= d) and (d <= inner + 1.5):
                    c[i] = 15
                elif (inner + 1.5 <= d) and (d <= inner + 2.5):
                    c[i] = 15 if i == 15 else 15 - (15 - i) * (d - inner - 1.5)
                elif (outer - 1.5 <= d) and (d <= outer - 0.5):
                    c[i] = i - i * (d - outer + 1.5)
                elif (inner + 2.5 < d) and (d < outer - 1.5):
                    c[i] = i
                else:
                    c[i] = 0
                # clamp (should not be needed)
                c[i] = max(0, min(int(c[i]), 15))
            a = int(math.atan2((outer - 1 - x), (outer - 1 - y)) * 2 * 249 / math.pi)
            v = (a << 8) | (c[15] << 4) | c[5]
            f.write("%d," % v)
        f.write("},\n")
    f.write("};\n")