Simplified code

Tests/test_file_jxl_alpha.py

@@ -4,7 +4,7 @@ from PIL import Image
 
 from .helper import assert_image_similar_tofile, skip_unless_feature
 
-pytestmark = [skip_unless_feature("jpegxl")]
+pytestmark = skip_unless_feature("jpegxl")
 
 
 def test_read_rgba() -> None:

Tests/test_file_jxl_animated.py

@@ -6,7 +6,7 @@ from PIL import Image
 
 from .helper import assert_image_equal, skip_unless_feature
 
-pytestmark = [skip_unless_feature("jpegxl")]
+pytestmark = skip_unless_feature("jpegxl")
 
 
 def test_n_frames() -> None:
@@ -27,7 +27,7 @@ def test_float_duration() -> None:
         assert im.info["duration"] == 70
 
 
-def test_seeking() -> None:
+def test_seek() -> None:
     """
     Open an animated jxl file, and then try seeking through frames in reverse-order,
     verifying the durations are correct.
@@ -42,9 +42,7 @@ def test_seeking() -> None:
             total_dur = 0
             for frame in reversed(range(im1.n_frames)):
                 im1.seek(frame)
-                im1.load()
                 im2.seek(frame)
-                im2.load()
 
                 assert_image_equal(im1.convert("RGB"), im2.convert("RGB"))
 

Tests/test_file_jxl_metadata.py

@@ -8,7 +8,7 @@ from PIL import Image, JpegXlImagePlugin
 
 from .helper import skip_unless_feature
 
-pytestmark = [skip_unless_feature("jpegxl")]
+pytestmark = skip_unless_feature("jpegxl")
 
 ElementTree: ModuleType | None
 try:
@@ -33,8 +33,8 @@ def test_read_exif_metadata() -> None:
 
         exif = im.getexif()
 
-        # Camera make
-        assert exif[271] == "Canon"
+    # Camera make
+    assert exif[271] == "Canon"
 
     with Image.open("Tests/images/flower.jpg") as im_jpeg:
         expected_exif = im_jpeg.info["exif"]
@@ -49,7 +49,7 @@ def test_read_exif_metadata_without_prefix() -> None:
         assert im.info["exif"][:6] != b"Exif\x00\x00"
 
         exif = im.getexif()
-        assert exif[305] == "Adobe Photoshop CS6 (Macintosh)"
+    assert exif[305] == "Adobe Photoshop CS6 (Macintosh)"
 
 
 def test_read_icc_profile() -> None:

src/PIL/JpegXlImagePlugin.py

@@ -14,7 +14,7 @@ except ImportError:
 
 
 ## Future idea:
-## it's not known how many frames does animated image have
+## it's not known how many frames an animated image has
 ## by default, _jxl_decoder_new will iterate over all frames without decoding them
 ## then libjxl decoder is rewinded and we're ready to decode frame by frame
 ## if OPEN_COUNTS_FRAMES is False, n_frames will be None until the last frame is decoded
@@ -74,8 +74,7 @@ class JpegXlImageFile(ImageFile.ImageFile):
 
         self._rewind()
 
-    def _get_next(self) -> tuple[bytes, float, float, bool]:
-
+    def _get_next(self) -> tuple[bytes, float, float]:
         # Get next frame
         next_frame = self._decoder.get_next()
         self.__physical_frame += 1
@@ -95,7 +94,7 @@ class JpegXlImageFile(ImageFile.ImageFile):
         timestamp = self.__timestamp
         self.__timestamp += duration
 
-        return data, timestamp, duration, is_last
+        return data, timestamp, duration
 
     def _rewind(self, hard: bool = False) -> None:
         if hard:
@@ -125,9 +124,7 @@ class JpegXlImageFile(ImageFile.ImageFile):
         if self.__loaded != self.__logical_frame:
             self._seek(self.__logical_frame)
 
-            data, timestamp, duration, is_last = self._get_next()
-            self.info["timestamp"] = timestamp
-            self.info["duration"] = duration
+            data, self.info["timestamp"], self.info["duration"] = self._get_next()
             self.__loaded = self.__logical_frame
 
             # Set tile