42_KFS/tools/font_converter.py

from PIL import Image

import re
import sys
import os

if (len(sys.argv) < 2):
    print(f"Error: usage python {sys.argv[0]} {{file.fnt}}")

with open(sys.argv[1]) as f:
    fnt_data = f.read()

font_name: str = os.path.basename(sys.argv[1]).split(".")[0]

img_file_relative_path: str = re.findall(r"file=\"(\w+[^\"]+)\"", fnt_data)[0]
img_file_absolute_path: str = sys.argv[1][0:sys.argv[1].rfind("/") +
                                          1] + img_file_relative_path

image = Image.open(img_file_absolute_path)

width, height = image.size
pixels = list(image.getdata())
pixels = [pixels[i * width:(i + 1) * width] for i in range(height)]

characteres: list[list[int]] = [None for i in range(128)]

for id, x, y, width, height, xoffset, yoffset, xadvance in re.findall(
        r"id=(\d+) x=(\d+) y=(\d+) width=(\d+) height=(\d+) xoffset=(-?\d+) yoffset=(-?\d+) xadvance=(\d+)",
        fnt_data):
    id, x, y, width, height, xoffset, yoffset, xadvance = int(id), int(x), int(
        y), int(width), int(height), int(xoffset), int(yoffset), int(xadvance)
    bitmap: list[str] = []
    for line in pixels[y:y + height]:
        tmp: str = ""
        for r, g, b, a in line[x:x + width]:
            tmp += "#" if a else " "
        bitmap.append(tmp)
    characteres[id] = [height, width, yoffset, bitmap]

string: str = f"""\
#pragma once

#include <stddef.h>

#include "font.h"

struct font {font_name}_font[] = {{\\\
"""

for charactere in characteres:
    if (charactere is not None):
        height, width, yoffset, bitmap = charactere
        string += f"""
        {{
            .width = {width},
            .height = {height},
            .yoffset = {yoffset},
            .bitmap = "{"".join(bitmap)}",
        }},\
        """
    else:
        string += f"""
        {{
            .width = 0,
            .height = 0,
            .yoffset = 0,
            .bitmap = NULL,
        }},\
        """
string += "\n};"

if not os.path.exists("./headers/fonts"):
    os.makedirs("./headers/fonts")

with open(f"./headers/fonts/{font_name}.h", "w") as f:
    f.write(string)