Merge pull request matplotlib#22766 from tacaswell/fix_pillow_compat

FIX: account for constant deprecations in Pillow 9.1

Author: oscargus

azure-pipelines.yml

@@ -138,6 +138,9 @@ stages:
       - script: env
         displayName: 'print env'
 
+      - script: pip list
+        displayName: 'print pip'
+
       - bash: |
           PYTHONFAULTHANDLER=1 python -m pytest --junitxml=junit/test-results.xml -raR --maxfail=50 --timeout=300 --durations=25 --cov-report= --cov=lib -n 2 ||
             [[ "$PYTHON_VERSION" = 'Pre' ]]

lib/matplotlib/animation.py

@@ -17,6 +17,7 @@
 #   * Can blit be enabled for movies?
 # * Need to consider event sources to allow clicking through multiple figures
 
+
 import abc
 import base64
 import contextlib
@@ -468,14 +469,15 @@ def grab_frame(self, **savefig_kwargs):
     def finish(self):
         # Call run here now that all frame grabbing is done. All temp files
         # are available to be assembled.
-        self._run()
-        super().finish()  # Will call clean-up
-
-    def _cleanup(self):  # Inline to finish() once cleanup() is removed.
-        super()._cleanup()
-        if self._tmpdir:
-            _log.debug('MovieWriter: clearing temporary path=%s', self._tmpdir)
-            self._tmpdir.cleanup()
+        try:
+            self._run()
+            super().finish()
+        finally:
+            if self._tmpdir:
+                _log.debug(
+                    'MovieWriter: clearing temporary path=%s', self._tmpdir
+                )
+                self._tmpdir.cleanup()
 
 
 @writers.register('pillow')

lib/matplotlib/backends/backend_pdf.py

@@ -1700,8 +1700,13 @@ def _writeImg(self, data, id, smask=None):
                 # Convert to indexed color if there are 256 colors or fewer
                 # This can significantly reduce the file size
                 num_colors = len(img_colors)
-                img = img.convert(mode='P', dither=Image.NONE,
-                                  palette=Image.ADAPTIVE, colors=num_colors)
+                # These constants were converted to IntEnums and deprecated in
+                # Pillow 9.2
+                dither = getattr(Image, 'Dither', Image).NONE
+                pmode = getattr(Image, 'Palette', Image).ADAPTIVE
+                img = img.convert(
+                    mode='P', dither=dither, palette=pmode, colors=num_colors
+                )
                 png_data, bit_depth, palette = self._writePng(img)
                 if bit_depth is None or palette is None:
                     raise RuntimeError("invalid PNG header")