fix: Fix Pillow font.

vis4d/vis/image/canvas/pillow_backend.py

@@ -1,8 +1,12 @@
 """Pillow backend implementation to draw on images."""
 from __future__ import annotations
 
+import base64
+from io import BytesIO
+
 import numpy as np
-from PIL import Image, ImageDraw, ImageFont
+from PIL import Image, ImageDraw
+from PIL.ImageFont import ImageFont
 
 from vis4d.common.typing import NDArrayBool, NDArrayF32, NDArrayF64, NDArrayUI8
 
@@ -13,14 +17,14 @@
 class PillowCanvasBackend(CanvasBackend):
     """Canvas backend using Pillow."""
 
-    def __init__(self, font: ImageFont.Font | None = None) -> None:
+    def __init__(self, font: ImageFont | None = None) -> None:
         """Creates a new canvas backend.
 
         Args:
             font (ImageFont): Pillow font to use for the label.
         """
         self._image_draw: ImageDraw.ImageDraw | None = None
-        self._font = font if font is not None else ImageFont.load_default()
+        self._font = font if font is not None else load_default_font()
         self._image: Image.Image | None = None
 
     def create_canvas(
@@ -354,3 +358,140 @@ def save_to_disk(self, image_path: str) -> None:
                 "No Image initialized! Did you call 'create_canvas'?"
             )
         self._image.save(image_path)
+
+
+def load_default_font() -> ImageFont:
+    """Load a "better than nothing" default font."""
+    f = ImageFont()
+    f._load_pilfont_data(  # pylint: disable=protected-access
+        # courB08
+        BytesIO(
+            base64.b64decode(
+                b"""
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+"""
+            )
+        ),
+        Image.open(
+            BytesIO(
+                base64.b64decode(
+                    b"""
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+"""
+                )
+            )
+        ),
+    )
+    return f