Added type hints

src/PIL/BlpImagePlugin.py

@@ -253,7 +253,7 @@ class BlpImageFile(ImageFile.ImageFile):
     format = "BLP"
     format_description = "Blizzard Mipmap Format"
 
-    def _open(self):
+    def _open(self) -> None:
         self.magic = self.fp.read(4)
 
         self.fp.seek(5, os.SEEK_CUR)
@@ -333,7 +333,7 @@ class _BLPBaseDecoder(ImageFile.PyDecoder):
 
 
 class BLP1Decoder(_BLPBaseDecoder):
-    def _load(self):
+    def _load(self) -> None:
         if self._blp_compression == Format.JPEG:
             self._decode_jpeg_stream()
 
@@ -418,7 +418,7 @@ class BLP2Decoder(_BLPBaseDecoder):
 class BLPEncoder(ImageFile.PyEncoder):
     _pushes_fd = True
 
-    def _write_palette(self):
+    def _write_palette(self) -> bytes:
         data = b""
         palette = self.im.getpalette("RGBA", "RGBA")
         for i in range(len(palette) // 4):

src/PIL/BmpImagePlugin.py

@@ -283,7 +283,7 @@ class BmpImageFile(ImageFile.ImageFile):
             )
         ]
 
-    def _open(self):
+    def _open(self) -> None:
         """Open file, check magic number and read header"""
         # read 14 bytes: magic number, filesize, reserved, header final offset
         head_data = self.fp.read(14)
@@ -376,7 +376,7 @@ class DibImageFile(BmpImageFile):
     format = "DIB"
     format_description = "Windows Bitmap"
 
-    def _open(self):
+    def _open(self) -> None:
         self._bitmap()
 
 

src/PIL/DcxImagePlugin.py

@@ -63,7 +63,7 @@ class DcxImageFile(PcxImageFile):
         self.is_animated = self.n_frames > 1
         self.seek(0)
 
-    def seek(self, frame):
+    def seek(self, frame: int) -> None:
         if not self._seek_check(frame):
             return
         self.frame = frame
@@ -71,7 +71,7 @@ class DcxImageFile(PcxImageFile):
         self.fp.seek(self._offset[frame])
         PcxImageFile._open(self)
 
-    def tell(self):
+    def tell(self) -> int:
         return self.frame
 
 

src/PIL/DdsImagePlugin.py

@@ -331,7 +331,7 @@ class DdsImageFile(ImageFile.ImageFile):
     format = "DDS"
     format_description = "DirectDraw Surface"
 
-    def _open(self):
+    def _open(self) -> None:
         if not _accept(self.fp.read(4)):
             msg = "not a DDS file"
             raise SyntaxError(msg)

src/PIL/EpsImagePlugin.py

@@ -178,7 +178,7 @@ class PSFile:
         self.char = None
         self.fp.seek(offset, whence)
 
-    def readline(self):
+    def readline(self) -> str:
         s = [self.char or b""]
         self.char = None
 
@@ -212,7 +212,7 @@ class EpsImageFile(ImageFile.ImageFile):
 
     mode_map = {1: "L", 2: "LAB", 3: "RGB", 4: "CMYK"}
 
-    def _open(self):
+    def _open(self) -> None:
         (length, offset) = self._find_offset(self.fp)
 
         # go to offset - start of "%!PS"

src/PIL/FliImagePlugin.py

@@ -123,7 +123,7 @@ class FliImageFile(ImageFile.ImageFile):
                 palette[i] = (r, g, b)
                 i += 1
 
-    def seek(self, frame):
+    def seek(self, frame: int) -> None:
         if not self._seek_check(frame):
             return
         if frame < self.__frame:
@@ -162,7 +162,7 @@ class FliImageFile(ImageFile.ImageFile):
 
         self.__offset += framesize
 
-    def tell(self):
+    def tell(self) -> int:
         return self.__frame
 
 

src/PIL/GifImagePlugin.py

@@ -76,7 +76,7 @@ class GifImageFile(ImageFile.ImageFile):
 
     global_palette = None
 
-    def data(self):
+    def data(self) -> bytes | None:
         s = self.fp.read(1)
         if s and s[0]:
             return self.fp.read(s[0])
@@ -88,7 +88,7 @@ class GifImageFile(ImageFile.ImageFile):
                 return True
         return False
 
-    def _open(self):
+    def _open(self) -> None:
         # Screen
         s = self.fp.read(13)
         if not _accept(s):
@@ -147,7 +147,7 @@ class GifImageFile(ImageFile.ImageFile):
                     self.seek(current)
         return self._is_animated
 
-    def seek(self, frame):
+    def seek(self, frame: int) -> None:
         if not self._seek_check(frame):
             return
         if frame < self.__frame:
@@ -417,7 +417,7 @@ class GifImageFile(ImageFile.ImageFile):
             elif k in self.info:
                 del self.info[k]
 
-    def load_prepare(self):
+    def load_prepare(self) -> None:
         temp_mode = "P" if self._frame_palette else "L"
         self._prev_im = None
         if self.__frame == 0:
@@ -437,7 +437,7 @@ class GifImageFile(ImageFile.ImageFile):
 
         super().load_prepare()
 
-    def load_end(self):
+    def load_end(self) -> None:
         if self.__frame == 0:
             if self.mode == "P" and LOADING_STRATEGY == LoadingStrategy.RGB_ALWAYS:
                 if self._frame_transparency is not None:
@@ -463,7 +463,7 @@ class GifImageFile(ImageFile.ImageFile):
         else:
             self.im.paste(frame_im, self.dispose_extent)
 
-    def tell(self):
+    def tell(self) -> int:
         return self.__frame
 
 

src/PIL/Hdf5StubImagePlugin.py

@@ -37,7 +37,7 @@ class HDF5StubImageFile(ImageFile.StubImageFile):
     format = "HDF5"
     format_description = "HDF5"
 
-    def _open(self):
+    def _open(self) -> None:
         offset = self.fp.tell()
 
         if not _accept(self.fp.read(8)):

src/PIL/IcnsImagePlugin.py

@@ -252,7 +252,7 @@ class IcnsImageFile(ImageFile.ImageFile):
     format = "ICNS"
     format_description = "Mac OS icns resource"
 
-    def _open(self):
+    def _open(self) -> None:
         self.icns = IcnsFile(self.fp)
         self._mode = "RGBA"
         self.info["sizes"] = self.icns.itersizes()

src/PIL/IcoImagePlugin.py

@@ -302,7 +302,7 @@ class IcoImageFile(ImageFile.ImageFile):
     format = "ICO"
     format_description = "Windows Icon"
 
-    def _open(self):
+    def _open(self) -> None:
         self.ico = IcoFile(self.fp)
         self.info["sizes"] = self.ico.sizes()
         self.size = self.ico.entry[0]["dim"]

src/PIL/ImImagePlugin.py

@@ -278,7 +278,7 @@ class ImImageFile(ImageFile.ImageFile):
     def is_animated(self):
         return self.info[FRAMES] > 1
 
-    def seek(self, frame):
+    def seek(self, frame: int) -> None:
         if not self._seek_check(frame):
             return
 
@@ -296,7 +296,7 @@ class ImImageFile(ImageFile.ImageFile):
 
         self.tile = [("raw", (0, 0) + self.size, offs, (self.rawmode, 0, -1))]
 
-    def tell(self):
+    def tell(self) -> int:
         return self.frame
 
 

src/PIL/Image.py

@@ -1298,7 +1298,10 @@ class Image:
         self.load()
         return self._new(self.im.expand(xmargin, ymargin))
 
-    def filter(self, filter):
+    if TYPE_CHECKING:
+        from . import ImageFilter
+
+    def filter(self, filter: ImageFilter.Filter | type[ImageFilter.Filter]) -> Image:
         """
         Filters this image using the given filter.  For a list of
         available filters, see the :py:mod:`~PIL.ImageFilter` module.
@@ -1310,7 +1313,7 @@ class Image:
 
         self.load()
 
-        if isinstance(filter, Callable):
+        if callable(filter):
             filter = filter()
         if not hasattr(filter, "filter"):
             msg = "filter argument should be ImageFilter.Filter instance or class"

src/PIL/ImageFile.py

@@ -311,7 +311,7 @@ class ImageFile(Image.Image):
 
         return Image.Image.load(self)
 
-    def load_prepare(self):
+    def load_prepare(self) -> None:
         # create image memory if necessary
         if not self.im or self.im.mode != self.mode or self.im.size != self.size:
             self.im = Image.core.new(self.mode, self.size)
@@ -319,7 +319,7 @@ class ImageFile(Image.Image):
         if self.mode == "P":
             Image.Image.load(self)
 
-    def load_end(self):
+    def load_end(self) -> None:
         # may be overridden
         pass
 
@@ -390,7 +390,7 @@ class Parser:
     offset = 0
     finished = 0
 
-    def reset(self):
+    def reset(self) -> None:
         """
         (Consumer) Reset the parser.  Note that you can only call this
         method immediately after you've created a parser; parser
@@ -605,7 +605,7 @@ def _safe_read(fp, size):
 
 
 class PyCodecState:
-    def __init__(self):
+    def __init__(self) -> None:
         self.xsize = 0
         self.ysize = 0
         self.xoff = 0
@@ -634,7 +634,7 @@ class PyCodec:
         """
         self.args = args
 
-    def cleanup(self):
+    def cleanup(self) -> None:
         """
         Override to perform codec specific cleanup
 

src/PIL/ImageFilter.py

@@ -16,11 +16,14 @@
 #
 from __future__ import annotations
 
+import abc
 import functools
 
 
 class Filter:
-    pass
+    @abc.abstractmethod
+    def filter(self, image):
+        pass
 
 
 class MultibandFilter(Filter):

src/PIL/ImageWin.py

@@ -204,7 +204,7 @@ class Window:
     def ui_handle_damage(self, x0, y0, x1, y1):
         pass
 
-    def ui_handle_destroy(self):
+    def ui_handle_destroy(self) -> None:
         pass
 
     def ui_handle_repair(self, dc, x0, y0, x1, y1):
@@ -213,7 +213,7 @@ class Window:
     def ui_handle_resize(self, width, height):
         pass
 
-    def mainloop(self):
+    def mainloop(self) -> None:
         Image.core.eventloop()
 
 

src/PIL/MicImagePlugin.py

@@ -38,7 +38,7 @@ class MicImageFile(TiffImagePlugin.TiffImageFile):
     format_description = "Microsoft Image Composer"
     _close_exclusive_fp_after_loading = False
 
-    def _open(self):
+    def _open(self) -> None:
         # read the OLE directory and see if this is a likely
         # to be a Microsoft Image Composer file
 
@@ -88,7 +88,7 @@ class MicImageFile(TiffImagePlugin.TiffImageFile):
     def tell(self):
         return self.frame
 
-    def close(self):
+    def close(self) -> None:
         self.__fp.close()
         self.ole.close()
         super().close()

src/PIL/MpoImagePlugin.py

@@ -127,7 +127,7 @@ class MpoImageFile(JpegImagePlugin.JpegImageFile):
     def load_seek(self, pos):
         self._fp.seek(pos)
 
-    def seek(self, frame):
+    def seek(self, frame: int) -> None:
         if not self._seek_check(frame):
             return
         self.fp = self._fp
@@ -149,7 +149,7 @@ class MpoImageFile(JpegImagePlugin.JpegImageFile):
         self.tile = [("jpeg", (0, 0) + self.size, self.offset, self.tile[0][-1])]
         self.__frame = frame
 
-    def tell(self):
+    def tell(self) -> int:
         return self.__frame
 
     @staticmethod

src/PIL/PngImagePlugin.py

@@ -800,7 +800,7 @@ class PngImageFile(ImageFile.ImageFile):
             self.fp.close()
         self.fp = None
 
-    def seek(self, frame):
+    def seek(self, frame: int) -> None:
         if not self._seek_check(frame):
             return
         if frame < self.__frame:
@@ -909,10 +909,10 @@ class PngImageFile(ImageFile.ImageFile):
         else:
             self.dispose = None
 
-    def tell(self):
+    def tell(self) -> int:
         return self.__frame
 
-    def load_prepare(self):
+    def load_prepare(self) -> None:
         """internal: prepare to read PNG file"""
 
         if self.info.get("interlace"):
@@ -954,7 +954,7 @@ class PngImageFile(ImageFile.ImageFile):
 
         return self.fp.read(read_bytes)
 
-    def load_end(self):
+    def load_end(self) -> None:
         """internal: finished reading image data"""
         if self.__idat != 0:
             self.fp.read(self.__idat)

src/PIL/PsdImagePlugin.py

@@ -57,7 +57,7 @@ class PsdImageFile(ImageFile.ImageFile):
     format_description = "Adobe Photoshop"
     _close_exclusive_fp_after_loading = False
 
-    def _open(self):
+    def _open(self) -> None:
         read = self.fp.read
 
         #
@@ -141,23 +141,22 @@ class PsdImageFile(ImageFile.ImageFile):
         self.frame = 1
         self._min_frame = 1
 
-    def seek(self, layer):
+    def seek(self, layer: int) -> None:
         if not self._seek_check(layer):
             return
 
         # seek to given layer (1..max)
         try:
-            name, mode, bbox, tile = self.layers[layer - 1]
+            _, mode, _, tile = self.layers[layer - 1]
             self._mode = mode
             self.tile = tile
             self.frame = layer
             self.fp = self._fp
-            return name, bbox
         except IndexError as e:
             msg = "no such layer"
             raise EOFError(msg) from e
 
-    def tell(self):
+    def tell(self) -> int:
         # return layer number (0=image, 1..max=layers)
         return self.frame
 

src/PIL/SpiderImagePlugin.py

@@ -97,7 +97,7 @@ class SpiderImageFile(ImageFile.ImageFile):
     format_description = "Spider 2D image"
     _close_exclusive_fp_after_loading = False
 
-    def _open(self):
+    def _open(self) -> None:
         # check header
         n = 27 * 4  # read 27 float values
         f = self.fp.read(n)
@@ -165,13 +165,13 @@ class SpiderImageFile(ImageFile.ImageFile):
         return self._nimages > 1
 
     # 1st image index is zero (although SPIDER imgnumber starts at 1)
-    def tell(self):
+    def tell(self) -> int:
         if self.imgnumber < 1:
             return 0
         else:
             return self.imgnumber - 1
 
-    def seek(self, frame):
+    def seek(self, frame: int) -> None:
         if self.istack == 0:
             msg = "attempt to seek in a non-stack file"
             raise EOFError(msg)

src/PIL/TiffImagePlugin.py

@@ -1143,7 +1143,7 @@ class TiffImageFile(ImageFile.ImageFile):
             self.seek(current)
         return self._n_frames
 
-    def seek(self, frame):
+    def seek(self, frame: int) -> None:
         """Select a given frame as current image"""
         if not self._seek_check(frame):
             return
@@ -1198,7 +1198,7 @@ class TiffImageFile(ImageFile.ImageFile):
         self.__frame = frame
         self._setup()
 
-    def tell(self):
+    def tell(self) -> int:
         """Return the current frame number"""
         return self.__frame
 
@@ -1237,7 +1237,7 @@ class TiffImageFile(ImageFile.ImageFile):
             return self._load_libtiff()
         return super().load()
 
-    def load_end(self):
+    def load_end(self) -> None:
         # allow closing if we're on the first frame, there's no next
         # This is the ImageFile.load path only, libtiff specific below.
         if not self.is_animated:
@@ -1942,7 +1942,7 @@ class AppendingTiffWriter:
         self.beginning = self.f.tell()
         self.setup()
 
-    def setup(self):
+    def setup(self) -> None:
         # Reset everything.
         self.f.seek(self.beginning, os.SEEK_SET)
 
@@ -1967,7 +1967,7 @@ class AppendingTiffWriter:
         self.skipIFDs()
         self.goToEnd()
 
-    def finalize(self):
+    def finalize(self) -> None:
         if self.isFirst:
             return
 
@@ -1990,7 +1990,7 @@ class AppendingTiffWriter:
         self.f.seek(ifd_offset)
         self.fixIFD()
 
-    def newFrame(self):
+    def newFrame(self) -> None:
         # Call this to finish a frame.
         self.finalize()
         self.setup()
@@ -2013,7 +2013,7 @@ class AppendingTiffWriter:
         self.f.seek(offset, whence)
         return self.tell()
 
-    def goToEnd(self):
+    def goToEnd(self) -> None:
         self.f.seek(0, os.SEEK_END)
         pos = self.f.tell()
 
@@ -2029,7 +2029,7 @@ class AppendingTiffWriter:
         self.shortFmt = self.endian + "H"
         self.tagFormat = self.endian + "HHL"
 
-    def skipIFDs(self):
+    def skipIFDs(self) -> None:
         while True:
             ifd_offset = self.readLong()
             if ifd_offset == 0:
@@ -2084,11 +2084,11 @@ class AppendingTiffWriter:
             msg = f"wrote only {bytes_written} bytes but wanted 4"
             raise RuntimeError(msg)
 
-    def close(self):
+    def close(self) -> None:
         self.finalize()
         self.f.close()
 
-    def fixIFD(self):
+    def fixIFD(self) -> None:
         num_tags = self.readShort()
 
         for i in range(num_tags):

src/PIL/WalImageFile.py

@@ -32,7 +32,7 @@ class WalImageFile(ImageFile.ImageFile):
     format = "WAL"
     format_description = "Quake2 Texture"
 
-    def _open(self):
+    def _open(self) -> None:
         self._mode = "P"
 
         # read header fields

src/PIL/WebPImagePlugin.py

@@ -109,7 +109,7 @@ class WebPImageFile(ImageFile.ImageFile):
         """
         return self._getxmp(self.info["xmp"]) if "xmp" in self.info else {}
 
-    def seek(self, frame):
+    def seek(self, frame: int) -> None:
         if not self._seek_check(frame):
             return
 
@@ -174,7 +174,7 @@ class WebPImageFile(ImageFile.ImageFile):
     def load_seek(self, pos):
         pass
 
-    def tell(self):
+    def tell(self) -> int:
         if not _webp.HAVE_WEBPANIM:
             return super().tell()