Tile iterators now report their length

CHANGELOG.md

@@ -9,6 +9,7 @@
 - Better handle IndicaLabs tiff files ([#1717](../../pull/1717))
 - Better detect files with geotransform data that aren't geospatial ([#1718](../../pull/1718))
 - Better scale float-valued tiles ([#1725](../../pull/1725))
+- Tile iterators now report their length ([#1730](../../pull/1730))
 
 ### Changes
 

large_image/tilesource/tileiterator.py

@@ -68,6 +68,15 @@
             return self.info
         return {}
 
+    def __len__(self) -> Optional[int]:
+        if self.info is None:
+            return None
+        iterlen = ((cast(int, self.info['xmax']) - cast(int, self.info['xmin'])) *
+                   (cast(int, self.info['ymax']) - cast(int, self.info['ymin'])))
+        if self.info.get('tile_position') is not None:
+            return 1 if cast(int, self.info['tile_position']) < iterlen else 0
+        return iterlen
+
     def _tileIteratorInfo(self, **kwargs) -> Optional[Dict[str, Any]]:  # noqa
         """
         Get information necessary to construct a tile iterator.

sources/pil/setup.py

@@ -59,7 +59,7 @@ def prerelease_local_scheme(version):
         'all': [
             'rawpy ; python_version < "3.13"',
             'pillow-heif',
-            'pillow-jxl-plugin ; python_version < "3.13"',
+            'pillow-jxl-plugin',
             'pillow-jpls',
         ],
         'girder': f'girder-large-image{limit_version}',