This script will convert an XBM file (X11 format) to a format compatible with the DigisparkOLED library

convert_xbm.py

import re
import sys

assert len(sys.argv) >= 2, "Usage ./xbm_converter.py filename.xbm [invert] > image.h"

XBM_FILE = sys.argv[1]
INVERT = sys.argv[2] == "invert" if len(sys.argv) > 2 else False

WIDTH = 128
HEIGHT = 64

with open(XBM_FILE) as f:
	data = f.read()


img_data = "".join(re.findall("0x([\da-f]{2})", data, re.MULTILINE))
img_bytes = bytearray.fromhex(img_data)
reordered_bytes = bytearray(WIDTH * HEIGHT / 8)

orig_img_binary_data = "".join("{0:08b}".format(int(i))[::-1] for i in img_bytes)
img_data_to_process = orig_img_binary_data

if INVERT:
	orig_img_binary_data_inverted = "".join(map(lambda x: "0" if x == "1" else "1", orig_img_binary_data))
	img_data_to_process = orig_img_binary_data_inverted


img_binary_data = list("".join("{0:08b}".format(i) for i in reordered_bytes))
for j, b in enumerate(img_data_to_process):
	offset = WIDTH * 8 * (j / (WIDTH * 8))
	i = j - offset
	img_binary_data[offset + (i % WIDTH) * 8 + (i / WIDTH)] = b

reordered_bytes = [img_binary_data[i:i+8] for i in range(0, HEIGHT * WIDTH, 8)]
reordered_data = [hex(int("".join(i)[::-1], 2)) for i in reordered_bytes]

print "const uint8_t PROGMEM img[] = {"
for i in range(0, HEIGHT * WIDTH / 8, WIDTH / 8):
	print ", ".join(reordered_data[i:i+WIDTH/8]), ", "
print "};"