Python结合FontTools实现自动生成字体子集工具

cd /d F:\tools\fonttools

python -m venv venv

venv\Scripts\activate

(venv)

where python

F:\tools\fonttools\venv\Scripts\python.exe

python -m pip install fonttools

python -m pip install pyinstaller

python -c "from fontTools.subset import main;print('OK')"

import sys
from pathlib import Path
from fontTools.subset import main as pyftsubset_main
FONT_EXTS = {".ttf", ".otf"}
def read_text_auto(path):
    data = Path(path).read_bytes()
    for enc in ("utf-8-sig", "utf-8", "gbk", "gb18030"):
        try:
            return data.decode(enc), enc
        except UnicodeDecodeError:
            pass
    return data.decode("gb18030", errors="ignore"), "gb18030-ignore"
def sort_key(c):
    code = ord(c)
    if '0' <= c <= '9':
        return (0, code)
    if 'A' <= c <= 'Z':
        return (1, code)
    if 'a' <= c <= 'z':
        return (2, code)
    if 0x4E00 <= code <= 0x9FFF:
        return (4, code)
    return (3, code)
def make_unique_chars(text):
    chars = {
        c
        for c in text
        if not c.isspace()
        and ord(c) >= 32
    }
    return "".join(sorted(chars, key=sort_key))
def build_subset(font_path, chars_path, out_font_path):
    pyftsubset_main([
        str(font_path),
        f"--text-file={chars_path}",
        f"--output-file={out_font_path}",
        "--layout-features=*",
        "--glyph-names",
        "--symbol-cmap",
        "--legacy-cmap",
        "--notdef-glyph",
        "--notdef-outline",`
        "--recommended-glyphs",
    ])
def main():
    if len(sys.argv) < 3:
        print("用法: font_subset_core.exe 字体.ttf 文本.txt")
        return
    font_path = Path(sys.argv[1])
    text_path = Path(sys.argv[2])
    if not font_path.exists():
        print("字体文件不存在:", font_path)
        return
    if not text_path.exists():
        print("文本文件不存在:", text_path)
        return
    if font_path.suffix.lower() not in FONT_EXTS:
        print("第一个参数必须是字体文件:", font_path)
        return
    text, enc = read_text_auto(text_path)
    chars = make_unique_chars(text)
    chars_path = text_path.with_name(text_path.stem + "_chars.txt")
    chars_path.write_text(chars, encoding="utf-8")
    out_font_path = font_path.with_name(font_path.stem + "_subset" + font_path.suffix)
    build_subset(font_path, chars_path, out_font_path)
    print("处理完成")
    print("识别编码 :", enc)
    print("字符数量 :", len(chars))
    print("字符文件 :", chars_path)
    print("子集字体 :", out_font_path)
if __name__ == "__main__":
    main()

python font_subset_core.py 字体.ttf 文本.txt

python font_subset_core.py test.ttf test.txt

python -m PyInstaller -F --clean --collect-all fontTools --name FontSubset font_subset_core.py

FontSubset.exe FZBWKS.ttf all_text.txt

all_text_chars.txt     // 去重后的字符集
FZBWKS_subset.ttf      // 生成的子集字体