#!/usr/bin/env python3

from PIL import Image

FONT_SIZE = (4, 8)


def convert(filename, subset=range(0,128)):
    img = Image.open(filename)
    print("""#include <stdint.h>

uint16_t default_font[] = {""")
    grid = (img.size[0] // FONT_SIZE[0], img.size[1] // FONT_SIZE[1])
    ch = 0
    for r in range(grid[1]):
        for c in range(grid[0]):
            v = 0
            for x in range(FONT_SIZE[0]):
                for y in range(FONT_SIZE[1]-1, -1, -1):
                    v <<= 1
                    if img.getpixel((c*FONT_SIZE[0]+x,r*FONT_SIZE[1]+y)):
                        v |= 1
            h = (v >> 16) & 0xffff
            l = v & 0xffff
            if 32 <= ch < 127:
                d = f'"{ch:c}" '
            else:
                d = ''
            if ch in subset:
                print(f"\t0x{h:04x}, 0x{l:04x},\t/* {ch:3d} 0x{ch:02x} {d}*/")
            ch += 1
    print("};")


if __name__ == '__main__':
    import sys

    for fn in sys.argv[1:]:
        convert(fn)