trezor-firmware/gen/fonts/generate.py

#!/usr/bin/env python
from __future__ import print_function
from PIL import Image

class Img(object):

    def __init__(self, fn):
        im = Image.open(fn)
        self.w, self.h = im.size
        self.data = list(im.getdata())

    def pixel(self, r, c):
        p = self.data[ r + c * self.w ]
        if p == (255, 255, 255):
            return '0'
        if p == (0, 0, 0):
            return '1'
        if p == (255, 0, 255):
            return None
        raise Exception('Unknown color', p)

img = Img('font.png')
cur = ''

for i in range(256):
    x = (i % 16) * 10
    y = (i // 16) * 10
    cur = ''
    while img.pixel(x, y) != None:
        val = ''.join(img.pixel(x, y + j) for j in range(8))
        x += 1
        cur += '\\x%02x' % int(val, 2)
    cur = '\\x%02x' % (len(cur) // 4) + cur
    ch = chr(i) if i >= 32 and i <= 126 else '_'
    print('\t/* 0x%02x %c */ (uint8_t *)"%s",' % (i, ch , cur))