use Image.LANCZOS instead of Image.ANTIALIAS for thumbnail resize

Image.ANTIALIAS is not defined in current pillow releases. Since ANTIALIAS was just using LANCZOS anyways, this is just a cosmetic change, but makes synapse work with most recent pillow releases. Signed-off-by: Giovanni Harting <[email protected]>
matrix-org · Jul 4, 2023 · 9f6735f · 9f6735f
1 parent 670d590
commit 9f6735f
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diff --git a/changelog.d/15876.bugfix b/changelog.d/15876.bugfix
@@ -0,0 +1 @@
+Correctly resize thumbnails with pillow version >=10.
diff --git a/synapse/media/thumbnailer.py b/synapse/media/thumbnailer.py
@@ -131,7 +131,7 @@ def _resize(self, width: int, height: int) -> Image.Image:
             else:
                 with self.image:
                     self.image = self.image.convert("RGB")
-        return self.image.resize((width, height), Image.ANTIALIAS)
+        return self.image.resize((width, height), Image.LANCZOS)
 
     def scale(self, width: int, height: int, output_type: str) -> BytesIO:
         """Rescales the image to the given dimensions.