Add library version numbers to public API

Tests/test_features.py

@@ -1,4 +1,5 @@
 import io
+import re
 
 import pytest
 from PIL import features
@@ -21,6 +22,27 @@ def test_check():
         assert features.check_feature(feature) == features.check(feature)
 
 
+def test_version():
+    # Check the correctness of the convenience function
+    # and the format of version numbers
+
+    def test(name, function):
+        version = features.version(name)
+        if not features.check(name):
+            assert version is None
+        else:
+            assert function(name) == version
+            if name != "PIL":
+                assert version is None or re.search(r"\d+(\.\d+)*$", version)
+
+    for module in features.modules:
+        test(module, features.version_module)
+    for codec in features.codecs:
+        test(codec, features.version_codec)
+    for feature in features.features:
+        test(feature, features.version_feature)
+
+
 @skip_unless_feature("webp")
 def test_webp_transparency():
     assert features.check("transp_webp") != _webp.WebPDecoderBuggyAlpha()
@@ -37,9 +59,22 @@ def test_webp_anim():
     assert features.check("webp_anim") == _webp.HAVE_WEBPANIM
 
 
+@skip_unless_feature("libjpeg_turbo")
+def test_libjpeg_turbo_version():
+    assert re.search(r"\d+\.\d+\.\d+$", features.version("libjpeg_turbo"))
+
+
+@skip_unless_feature("libimagequant")
+def test_libimagequant_version():
+    assert re.search(r"\d+\.\d+\.\d+$", features.version("libimagequant"))
+
+
 def test_check_modules():
     for feature in features.modules:
         assert features.check_module(feature) in [True, False]
+
+
+def test_check_codecs():
     for feature in features.codecs:
         assert features.check_codec(feature) in [True, False]
 
@@ -64,6 +99,8 @@ def test_unsupported_codec():
     # Act / Assert
     with pytest.raises(ValueError):
         features.check_codec(codec)
+    with pytest.raises(ValueError):
+        features.version_codec(codec)
 
 
 def test_unsupported_module():
@@ -72,6 +109,8 @@ def test_unsupported_module():
     # Act / Assert
     with pytest.raises(ValueError):
         features.check_module(module)
+    with pytest.raises(ValueError):
+        features.version_module(module)
 
 
 def test_pilinfo():

Tests/test_file_icns.py

@@ -2,14 +2,14 @@
 import sys
 
 import pytest
-from PIL import IcnsImagePlugin, Image
+from PIL import IcnsImagePlugin, Image, features
 
 from .helper import assert_image_equal, assert_image_similar
 
 # sample icon file
 TEST_FILE = "Tests/images/pillow.icns"
 
-ENABLE_JPEG2K = hasattr(Image.core, "jp2klib_version")
+ENABLE_JPEG2K = features.check_codec("jpg_2000")
 
 
 def test_sanity():

Tests/test_file_jpeg.py

@@ -3,7 +3,7 @@
 from io import BytesIO
 
 import pytest
-from PIL import ExifTags, Image, ImageFile, JpegImagePlugin
+from PIL import ExifTags, Image, ImageFile, JpegImagePlugin, features
 
 from .helper import (
     assert_image,
@@ -41,7 +41,7 @@ def gen_random_image(self, size, mode="RGB"):
     def test_sanity(self):
 
         # internal version number
-        assert re.search(r"\d+\.\d+$", Image.core.jpeglib_version)
+        assert re.search(r"\d+\.\d+$", features.version_codec("jpg"))
 
         with Image.open(TEST_FILE) as im:
             im.load()

Tests/test_file_jpeg2k.py

@@ -2,7 +2,7 @@
 from io import BytesIO
 
 import pytest
-from PIL import Image, ImageFile, Jpeg2KImagePlugin
+from PIL import Image, ImageFile, Jpeg2KImagePlugin, features
 
 from .helper import (
     assert_image_equal,
@@ -35,7 +35,7 @@ def roundtrip(im, **options):
 
 def test_sanity():
     # Internal version number
-    assert re.search(r"\d+\.\d+\.\d+$", Image.core.jp2klib_version)
+    assert re.search(r"\d+\.\d+\.\d+$", features.version_codec("jpg_2000"))
 
     with Image.open("Tests/images/test-card-lossless.jp2") as im:
         px = im.load()

Tests/test_file_libtiff.py

@@ -3,11 +3,12 @@
 import itertools
 import logging
 import os
+import re
 from collections import namedtuple
 from ctypes import c_float
 
 import pytest
-from PIL import Image, ImageFilter, TiffImagePlugin, TiffTags
+from PIL import Image, ImageFilter, TiffImagePlugin, TiffTags, features
 
 from .helper import (
     assert_image_equal,
@@ -47,6 +48,9 @@ def _assert_noerr(self, tmp_path, im):
 
 
 class TestFileLibTiff(LibTiffTestCase):
+    def test_version(self):
+        assert re.search(r"\d+\.\d+\.\d+$", features.version_codec("libtiff"))
+
     def test_g4_tiff(self, tmp_path):
         """Test the ordinary file path load path"""
 

Tests/test_file_png.py

@@ -3,7 +3,7 @@
 from io import BytesIO
 
 import pytest
-from PIL import Image, ImageFile, PngImagePlugin
+from PIL import Image, ImageFile, PngImagePlugin, features
 
 from .helper import (
     PillowLeakTestCase,
@@ -73,7 +73,7 @@ def get_chunks(self, filename):
     def test_sanity(self, tmp_path):
 
         # internal version number
-        assert re.search(r"\d+\.\d+\.\d+(\.\d+)?$", Image.core.zlib_version)
+        assert re.search(r"\d+\.\d+\.\d+(\.\d+)?$", features.version_codec("zlib"))
 
         test_file = str(tmp_path / "temp.png")
 

Tests/test_file_webp.py

@@ -1,7 +1,8 @@
 import io
+import re
 
 import pytest
-from PIL import Image, WebPImagePlugin
+from PIL import Image, WebPImagePlugin, features
 
 from .helper import (
     assert_image_similar,
@@ -38,6 +39,7 @@ def setup_method(self):
     def test_version(self):
         _webp.WebPDecoderVersion()
         _webp.WebPDecoderBuggyAlpha()
+        assert re.search(r"\d+\.\d+\.\d+$", features.version_module("webp"))
 
     def test_read_rgb(self):
         """

Tests/test_imagecms.py

@@ -4,7 +4,7 @@
 from io import BytesIO
 
 import pytest
-from PIL import Image, ImageMode
+from PIL import Image, ImageMode, features
 
 from .helper import assert_image, assert_image_equal, assert_image_similar, hopper
 
@@ -46,7 +46,7 @@ def test_sanity():
     assert list(map(type, v)) == [str, str, str, str]
 
     # internal version number
-    assert re.search(r"\d+\.\d+$", ImageCms.core.littlecms_version)
+    assert re.search(r"\d+\.\d+$", features.version_module("littlecms2"))
 
     skip_missing()
     i = ImageCms.profileToProfile(hopper(), SRGB, SRGB)

Tests/test_imagefont.py

@@ -7,7 +7,7 @@
 from io import BytesIO
 
 import pytest
-from PIL import Image, ImageDraw, ImageFont
+from PIL import Image, ImageDraw, ImageFont, features
 
 from .helper import (
     assert_image_equal,
@@ -40,7 +40,7 @@ class TestImageFont:
 
     @classmethod
     def setup_class(self):
-        freetype = distutils.version.StrictVersion(ImageFont.core.freetype2_version)
+        freetype = distutils.version.StrictVersion(features.version_module("freetype2"))
 
         self.metrics = self.METRICS["Default"]
         for conditions, metrics in self.METRICS.items():
@@ -67,7 +67,7 @@ def get_font(self):
         )
 
     def test_sanity(self):
-        assert re.search(r"\d+\.\d+\.\d+$", ImageFont.core.freetype2_version)
+        assert re.search(r"\d+\.\d+\.\d+$", features.version_module("freetype2"))
 
     def test_font_properties(self):
         ttf = self.get_font()
@@ -619,7 +619,7 @@ def test_complex_font_settings(self):
     def test_variation_get(self):
         font = self.get_font()
 
-        freetype = distutils.version.StrictVersion(ImageFont.core.freetype2_version)
+        freetype = distutils.version.StrictVersion(features.version_module("freetype2"))
         if freetype < "2.9.1":
             with pytest.raises(NotImplementedError):
                 font.get_variation_names()
@@ -691,7 +691,7 @@ def _check_text(self, font, path, epsilon):
     def test_variation_set_by_name(self):
         font = self.get_font()
 
-        freetype = distutils.version.StrictVersion(ImageFont.core.freetype2_version)
+        freetype = distutils.version.StrictVersion(features.version_module("freetype2"))
         if freetype < "2.9.1":
             with pytest.raises(NotImplementedError):
                 font.set_variation_by_name("Bold")
@@ -715,7 +715,7 @@ def test_variation_set_by_name(self):
     def test_variation_set_by_axes(self):
         font = self.get_font()
 
-        freetype = distutils.version.StrictVersion(ImageFont.core.freetype2_version)
+        freetype = distutils.version.StrictVersion(features.version_module("freetype2"))
         if freetype < "2.9.1":
             with pytest.raises(NotImplementedError):
                 font.set_variation_by_axes([100])

docs/reference/features.rst

@@ -8,6 +8,7 @@ The :py:mod:`PIL.features` module can be used to detect which Pillow features ar
 
 .. autofunction:: PIL.features.pilinfo
 .. autofunction:: PIL.features.check
+.. autofunction:: PIL.features.version
 .. autofunction:: PIL.features.get_supported
 
 Modules
@@ -16,45 +17,50 @@ Modules
 Support for the following modules can be checked:
 
 * ``pil``: The Pillow core module, required for all functionality.
-* ``tkinter``: Tkinter support.
+* ``tkinter``: Tkinter support. Version number not available.
 * ``freetype2``: FreeType font support via :py:func:`PIL.ImageFont.truetype`.
 * ``littlecms2``: LittleCMS 2 support via :py:mod:`PIL.ImageCms`.
 * ``webp``: WebP image support.
 
 .. autofunction:: PIL.features.check_module
+.. autofunction:: PIL.features.version_module
 .. autofunction:: PIL.features.get_supported_modules
 
 Codecs
 ------
 
-These are only checked during Pillow compilation.
+Support for these is only checked during Pillow compilation.
 If the required library was uninstalled from the system, the ``pil`` core module may fail to load instead.
+Except for ``jpg``, the version number is checked at run-time.
 
 Support for the following codecs can be checked:
 
-* ``jpg``: (compile time) Libjpeg support, required for JPEG based image formats.
+* ``jpg``: (compile time) Libjpeg support, required for JPEG based image formats. Only compile time version number is available.
 * ``jpg_2000``: (compile time) OpenJPEG support, required for JPEG 2000 image formats.
 * ``zlib``: (compile time) Zlib support, required for zlib compressed formats, such as PNG.
 * ``libtiff``: (compile time) LibTIFF support, required for TIFF based image formats.
 
 .. autofunction:: PIL.features.check_codec
+.. autofunction:: PIL.features.version_codec
 .. autofunction:: PIL.features.get_supported_codecs
 
 Features
 --------
 
 Some of these are only checked during Pillow compilation.
 If the required library was uninstalled from the system, the relevant module may fail to load instead.
+Feature version numbers are available only where stated.
 
 Support for the following features can be checked:
 
-* ``libjpeg_turbo``: (compile time) Whether Pillow was compiled against the libjpeg-turbo version of libjpeg.
+* ``libjpeg_turbo``: (compile time) Whether Pillow was compiled against the libjpeg-turbo version of libjpeg. Compile-time version number is available.
 * ``transp_webp``: Support for transparency in WebP images.
 * ``webp_mux``: (compile time) Support for EXIF data in WebP images.
 * ``webp_anim``: (compile time) Support for animated WebP images.
-* ``raqm``: Raqm library, required for ``ImageFont.LAYOUT_RAQM`` in :py:func:`PIL.ImageFont.truetype`.
-* ``libimagequant``: (compile time) ImageQuant quantization support in :py:func:`PIL.Image.Image.quantize`.
+* ``raqm``: Raqm library, required for ``ImageFont.LAYOUT_RAQM`` in :py:func:`PIL.ImageFont.truetype`. Run-time version number is available for Raqm 0.7.0 or newer.
+* ``libimagequant``: (compile time) ImageQuant quantization support in :py:func:`PIL.Image.Image.quantize`. Run-time version number is available.
 * ``xcb``: (compile time) Support for X11 in :py:func:`PIL.ImageGrab.grab` via the XCB library.
 
 .. autofunction:: PIL.features.check_feature
+.. autofunction:: PIL.features.version_feature
 .. autofunction:: PIL.features.get_supported_features

src/PIL/IcnsImagePlugin.py

@@ -23,10 +23,10 @@
 import sys
 import tempfile
 
-from PIL import Image, ImageFile, PngImagePlugin
+from PIL import Image, ImageFile, PngImagePlugin, features
 from PIL._binary import i8
 
-enable_jpeg2k = hasattr(Image.core, "jp2klib_version")
+enable_jpeg2k = features.check_codec("jpg_2000")
 if enable_jpeg2k:
     from PIL import Jpeg2KImagePlugin