Pillow Unknown file format error on some `woff2` fonts on `ImageFont.truetype()`

What did you do?

I'm trying to convert woff and woff2 fonts to ImageFont

What did you expect to happen?

Return a FreeTypeFont object

What actually happened?

It raises OSError Issue, terminates program.

What are your OS, Python and Pillow versions?

ProductName:	macOS
ProductVersion:	12.4
BuildVersion:	21F79
Python 3.9.13 (main, May 24 2022, 21:28:31)
[Clang 13.1.6 (clang-1316.0.21.2)] on darwin
Pillow==9.2.0

Here are some sample code represents my issue:

import requests
import os
from PIL import ImageFont

r = requests.get("https://cdn.jsdelivr.net/korean-webfonts/1/orgs/othrs/kywa/Youth/Youth.woff2", stream=True)
with open("Youth.woff2", "wb") as f:
    f.write(r.content)

print("Trying to get Font ...\t", end="...")

try:
    font = ImageFont.truetype("Youth.woff2")
    print("Success")
    os.remove("Youth.woff2")
except Exception as e:
    print("Failed " + str(e))
    os.remove("Youth.woff2")
    raise e

Traceback (most recent call last):
  File "/Users/mirusu400/kwoss/pillow-woff-issue/test2.py", line 18, in <module>
    raise e
  File "/Users/mirusu400/kwoss/pillow-woff-issue/test2.py", line 12, in <module>
    font = ImageFont.truetype("Youth.woff2")
  File "/usr/local/lib/python3.9/site-packages/PIL/ImageFont.py", line 959, in truetype
    return freetype(font)
  File "/usr/local/lib/python3.9/site-packages/PIL/ImageFont.py", line 956, in freetype
    return FreeTypeFont(font, size, index, encoding, layout_engine)
  File "/usr/local/lib/python3.9/site-packages/PIL/ImageFont.py", line 247, in __init__
    self.font = core.getfont(
OSError: unknown file format

I don't know detailed reason this happen, So I created a repo about this issue. https://github.com/mirusu400/pillow-woff-issue Here are some samples about having ImageFont issue.

Sep 01 '22 10:09 mirusu400

Thanks for your detailed example.

Looking at the output you've provided at https://github.com/mirusu400/pillow-woff-issue#result, it would seem that this is not failing for any of the woff files, only woff2. The font that you have trouble after fetching from a URL is also woff2.

When I try and run your repository code on my machine, all of the fonts pass.

So let me ask this - what version of freetype2 are you using? Support for woff2 was only added in freetype2 2.10.2

>>> from PIL import features
>>> features.version_module("freetype2")
'2.12.1'

Sep 01 '22 12:09 radarhere

Some anon posts lots of fonts which have errors: https://anonfiles.com/sc07oe67y1/fonts_error_zip

This all fonts have same OSErrors.

Also here is my freetype2 version:

Python 3.9.13 (main, May 24 2022, 21:28:31) 
[Clang 13.1.6 (clang-1316.0.21.2)] on darwin
Type "help", "copyright", "credits" or "license" for more information.
>>> from PIL import features
>>> features.version_module("freetype2")
'2.12.1'

Edit: There are mixed woff and woff2 files, but some anon renamed it to woff

Edit2: It seems all of woff files are woff2 files. Sorry for misinformation.

Sep 01 '22 12:09 mirusu400

Did you install Pillow from the wheel, or did you build it from source?

I found https://lists.gnu.org/archive/html/freetype-commit/2019-08/msg00250.html

Brotli is required for decompressing WOFF2 font directory streams.

And brotli is currently disabled in our macOS wheel builds.

Sep 02 '22 09:09 radarhere

I installed it from pip(wheel).

Also, I tried at Windows environment, still not works.

Here is my info about window environment:

Windows 10 21H2 19044.1889
Pillow==9.2.0
Python 3.9.12 (tags/v3.9.12:b28265d, Mar 23 2022, 23:52:46) [MSC v.1929 64 bit (AMD64)] on win32
>>> from PIL import features
>>> features.version_module("freetype2")
'2.12.1'

Sep 02 '22 09:09 mirusu400

Same problem and output with different Linux distributions in Docker:

FROM python:3.11-rc-bullseye

RUN set -ex \
    && apt-get update \
    && apt-get install -y -V libpng16-16 libpng-dev libbrotli1 libbrotli-dev libfreetype6 libfreetype-dev \
    && python -m pip install --upgrade pip \
    && pip install --no-cache-dir Pillow

FROM python:3.11-rc-buster

RUN set -ex \
    && apt-get update \
    && apt-get install -y -V libpng16-16 libpng-dev libbrotli1 libbrotli-dev libfreetype6 libfreetype6-dev \
    && python -m pip install --upgrade pip \
    && pip install --no-cache-dir Pillow

FROM python:3.11-rc-alpine

RUN set -ex \
    && apk update \
    && apk add --upgrade brotli brotli-dev freetype freetype-dev  \
    && python -m pip install --upgrade pip \
    && pip install --no-cache-dir Pillow

Sep 03 '22 08:09 lystor

https://github.com/python-pillow/pillow-wheels/pull/320 has been created to add brotli to our macOS and Linux wheels.

Sep 07 '22 07:09 radarhere

I've added brotli to the #6562 changes for Windows wheels.

Sep 07 '22 18:09 nulano

Pillow 9.3.0 has now been released, so brotli should be included in the latest wheels now.

Oct 29 '22 21:10 radarhere

Hi @radarhere !

I got same error when build docker to deploy on aws layer lambda

When run python test.py with FONT_NAME="Karla-Regular.woff2" (sample.ttf work fine)

123

And I try to change dockerfile with from

RUN pip3 install --no-cache-dir Pillow

to

// .whl file from https://github.com/python-pillow/pillow-wheels/releases/tag/10.0.0

COPY build/Pillow-10.0.0-cp310-cp310-manylinux_2_17_aarch64.manylinux2014_aarch64.whl .
RUN pip3 install Pillow-10.0.0-cp310-cp310-manylinux_2_17_aarch64.manylinux2014_aarch64.whl

It's still return error

bash-4.2# python test.py
Traceback (most recent call last):
  File "/var/task/test.py", line 6, in <module>
    font = ImageFont.truetype(
  File "/var/lang/lib/python3.10/site-packages/PIL/ImageFont.py", line 791, in truetype
    return freetype(font)
  File "/var/lang/lib/python3.10/site-packages/PIL/ImageFont.py", line 788, in freetype
    return FreeTypeFont(font, size, index, encoding, layout_engine)
  File "/var/lang/lib/python3.10/site-packages/PIL/ImageFont.py", line 226, in __init__
    self.font = core.getfont(
OSError: unknown file format