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Do not use CFFI access by default on PyPy #7236

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merged 4 commits into from
Jun 29, 2023

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@radarhere radarhere commented Jun 28, 2023

Resolves #7223

Pillow's C API is now faster than PyAccess on PyPy. However, PyAccess is part of our public API, so it can't be removed immediately.

This PR makes two changes.

  1. Image.USE_CFFI_ACCESS is set to False, even on PyPy, allowing the faster C API to be used by default. If users do set Image.USE_CFFI_ACCESS to True manually, then they will find that...
  2. PyAccess is now deprecated, to be removed in Pillow 11.

@radarhere radarhere added Performance Deprecation Feature that will be removed in the future labels Jun 28, 2023
@radarhere radarhere mentioned this pull request Jun 28, 2023

Since Pillow's C API is now faster than PyAccess on PyPy,
:py:mod:`~PIL.PyAccess` has been deprecated and will be removed in Pillow
11.0.0 (2024-10-15).
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And mention the C API is now used by default?

(And in docs/releasenotes/10.0.0.rst)

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I've updated the documentation to similarly deprecate Image.USE_CFFI_ACCESS.

Unfortunately, from https://discuss.python.org/t/extend-pep-562-with-setattr-for-modules/25506 it looks like it is not possible to override __setattr__ on a module, so we can't raise a deprecation warning if users call Image.USE_CFFI_ACCESS = True.

@hugovk hugovk added this to the 10.0.0 milestone Jun 29, 2023
@hugovk hugovk merged commit 2de1bf2 into python-pillow:main Jun 29, 2023
@radarhere radarhere deleted the pyaccess branch June 29, 2023 11:00
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Is CFFI still needed?
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