#!/usr/bin/env python3

# =====================================================

# Usage

# Install Python 3 if you don't have it, and then install the Pillow package like this:
# $ pip install Pillow
# Then, run the program like this, for example:
# $ python font-converter.py font.ttf font
# The above command will take a font file called "font.ttf" and slice it out into a directory called "font".

# =====================================================

# Licensing

# Copyright © 2025 baltdev

# Permission is hereby granted, free of
# charge, to any person obtaining a copy of this software and associated documentation
# files (the “Software”), to deal in the Software without restriction, including
# without limitation the rights to use, copy, modify, merge, publish, distribute,
# sublicense, and/or sell copies of the Software, and to permit persons to whom the
# Software is furnished to do so, subject to the following conditions:  The above
# copyright notice and this permission notice shall be included in all copies or
# substantial portions of the Software.

# THE SOFTWARE IS PROVIDED “AS IS”, WITHOUT
# WARRANTY OF ANY KIND, EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES
# OF MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO
# EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR
# OTHER LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING
# FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN
# THE SOFTWARE.

# =====================================================

from PIL import Image, ImageDraw, ImageFont
import sys
import os

FONT_SIZE = 256

def main():
  if len(sys.argv) <= 2:
    print("Usage: python font-converter.py <FONT.TTF> <Output Directory>")
    return
  if not os.path.exists(sys.argv[2]):
    os.mkdir(sys.argv[2])
  font = ImageFont.truetype(sys.argv[1], FONT_SIZE, encoding="unic")
  min_x, min_y, max_u, max_v = 99999999, 99999999, -99999999, -99999999
  for char_unic in range(32, 128):
    char = chr(char_unic)
    x, y, u, v = font.getbbox(char)
    min_x, min_y, max_u, max_v = min(x, min_x), min(y, min_y), max(u, max_u), max(v, max_v)
  width, height = max_u - min_x, max_v - min_y
  print(f"w: {width}, h: {height}, x: {min_x}, y: {min_y}, u: {max_u}, v: {max_v}")
  blank = Image.new("L", (width, height), 'white')
  for char_unic in range(32, 128):
    char = chr(char_unic)
    x, y, u, v = font.getbbox(char)
    print(u - x, v - y, width, height)
    canvas = Image.new("L", (width, height), "black")
    draw = ImageDraw.Draw(canvas)
    draw.text((-min_x, -min_y), char, 'white', font)
    glyph = Image.merge("RGBA", (blank, blank, blank, canvas))
    glyph.save(f"{sys.argv[2]}/{char_unic}.png")

if __name__ == "__main__":
  main()