Merge 86cb2edcfa into 333567f481

sticker/lib/util.py

@@ -148,15 +148,14 @@ def webp_to_others(data: bytes, mimetype: str) -> bytes:
 
 
 def is_uniform_animated_webp(data: bytes) -> bool:
-    with Image.open(BytesIO(data)) as img:
+    img = Image.open(BytesIO(data))
     if img.n_frames <= 1:
-            return True
+        return False
 
-        img_iter = ImageSequence.Iterator(img)
-        first_frame = np.array(img_iter[0].convert("RGBA"))
-
-        for frame in img_iter:
-            current_frame = np.array(frame.convert("RGBA"))
+    first_frame = np.array(img)
+    for frame_number in range(1, img.n_frames):
+        img.seek(frame_number)
+        current_frame = np.array(img)
         if not np.array_equal(first_frame, current_frame):
             return False
 
@@ -164,8 +163,8 @@ def is_uniform_animated_webp(data: bytes) -> bool:
 
 
 def webp_to_gif_or_png(data: bytes) -> bytes:
-    with Image.open(BytesIO(data)) as image:
     # check if the webp is animated
+    image: Image.Image = Image.open(BytesIO(data))
     is_animated = getattr(image, "is_animated", False)
     if is_animated and not is_uniform_animated_webp(data):
         return webp_to_others(data, "image/gif")
@@ -188,8 +187,8 @@ def opermize_gif(data: bytes) -> bytes:
 
 
 def _convert_image(data: bytes, mimetype: str) -> (bytes, int, int):
-    with Image.open(BytesIO(data)) as image:
-        with BytesIO() as new_file:
+    image: Image.Image = Image.open(BytesIO(data))
+    new_file = BytesIO()
     # Determine if the image is a GIF
     is_animated = getattr(image, "is_animated", False)
     if is_animated: