Added type hints

src/PIL/BdfFontFile.py

@@ -103,7 +103,7 @@ def bdf_char(
 class BdfFontFile(FontFile.FontFile):
     """Font file plugin for the X11 BDF format."""
 
-    def __init__(self, fp: BinaryIO):
+    def __init__(self, fp: BinaryIO) -> None:
         super().__init__()
 
         s = fp.readline()

src/PIL/ImageDraw.py

@@ -34,12 +34,16 @@
 import math
 import numbers
 import struct
+from types import ModuleType
 from typing import TYPE_CHECKING, AnyStr, Sequence, cast
 
 from . import Image, ImageColor
 from ._deprecate import deprecate
 from ._typing import Coords
 
+if TYPE_CHECKING:
+    from . import ImageDraw2, ImageFont
+
 """
 A simple 2D drawing interface for PIL images.
 <p>
@@ -93,9 +97,6 @@ def __init__(self, im: Image.Image, mode: str | None = None) -> None:
             self.fontmode = "L"  # aliasing is okay for other modes
         self.fill = False
 
-    if TYPE_CHECKING:
-        from . import ImageFont
-
     def getfont(
         self,
     ) -> ImageFont.ImageFont | ImageFont.FreeTypeFont | ImageFont.TransposedFont:
@@ -879,7 +880,7 @@ def multiline_textbbox(
         return bbox
 
 
-def Draw(im, mode: str | None = None) -> ImageDraw:
+def Draw(im: Image.Image, mode: str | None = None) -> ImageDraw:
     """
     A simple 2D drawing interface for PIL images.
 
@@ -891,7 +892,7 @@ def Draw(im, mode: str | None = None) -> ImageDraw:
        defaults to the mode of the image.
     """
     try:
-        return im.getdraw(mode)
+        return getattr(im, "getdraw")(mode)
     except AttributeError:
         return ImageDraw(im, mode)
 
@@ -903,7 +904,9 @@ def Draw(im, mode: str | None = None) -> ImageDraw:
     Outline = None
 
 
-def getdraw(im=None, hints=None):
+def getdraw(
+    im: Image.Image | None = None, hints: list[str] | None = None
+) -> tuple[ImageDraw2.Draw | None, ModuleType]:
     """
     :param im: The image to draw in.
     :param hints: An optional list of hints. Deprecated.
@@ -913,9 +916,8 @@ def getdraw(im=None, hints=None):
         deprecate("'hints' parameter", 12)
     from . import ImageDraw2
 
-    if im:
-        im = ImageDraw2.Draw(im)
-    return im, ImageDraw2
+    draw = ImageDraw2.Draw(im) if im is not None else None
+    return draw, ImageDraw2
 
 
 def floodfill(

src/PIL/ImagePalette.py

@@ -54,7 +54,7 @@ def palette(self, palette):
         self._palette = palette
 
     @property
-    def colors(self):
+    def colors(self) -> dict[tuple[int, int, int] | tuple[int, int, int, int], int]:
         if self._colors is None:
             mode_len = len(self.mode)
             self._colors = {}
@@ -66,7 +66,9 @@ def colors(self):
         return self._colors
 
     @colors.setter
-    def colors(self, colors):
+    def colors(
+        self, colors: dict[tuple[int, int, int] | tuple[int, int, int, int], int]
+    ) -> None:
         self._colors = colors
 
     def copy(self) -> ImagePalette:
@@ -107,11 +109,13 @@ def tobytes(self) -> bytes:
     # Declare tostring as an alias for tobytes
     tostring = tobytes
 
-    def _new_color_index(self, image=None, e=None):
+    def _new_color_index(
+        self, image: Image.Image | None = None, e: Exception | None = None
+    ) -> int:
         if not isinstance(self.palette, bytearray):
             self._palette = bytearray(self.palette)
         index = len(self.palette) // 3
-        special_colors = ()
+        special_colors: tuple[int | tuple[int, ...] | None, ...] = ()
         if image:
             special_colors = (
                 image.info.get("background"),

src/PIL/MicImagePlugin.py

@@ -63,7 +63,7 @@ def _open(self) -> None:
             msg = "not an MIC file; no image entries"
             raise SyntaxError(msg)
 
-        self.frame = None
+        self.frame = -1
         self._n_frames = len(self.images)
         self.is_animated = self._n_frames > 1
 
@@ -85,7 +85,7 @@ def seek(self, frame):
 
         self.frame = frame
 
-    def tell(self):
+    def tell(self) -> int:
         return self.frame
 
     def close(self) -> None:

src/PIL/PngImagePlugin.py

@@ -39,7 +39,7 @@
 import warnings
 import zlib
 from enum import IntEnum
-from typing import IO, Any
+from typing import IO, TYPE_CHECKING, Any, NoReturn
 
 from . import Image, ImageChops, ImageFile, ImagePalette, ImageSequence
 from ._binary import i16be as i16
@@ -48,6 +48,9 @@
 from ._binary import o16be as o16
 from ._binary import o32be as o32
 
+if TYPE_CHECKING:
+    from . import _imaging
+
 logger = logging.getLogger(__name__)
 
 is_cid = re.compile(rb"\w\w\w\w").match
@@ -249,6 +252,9 @@ class iTXt(str):
 
     """
 
+    lang: str | bytes | None
+    tkey: str | bytes | None
+
     @staticmethod
     def __new__(cls, text, lang=None, tkey=None):
         """
@@ -270,10 +276,10 @@ class PngInfo:
 
     """
 
-    def __init__(self):
-        self.chunks = []
+    def __init__(self) -> None:
+        self.chunks: list[tuple[bytes, bytes, bool]] = []
 
-    def add(self, cid, data, after_idat=False):
+    def add(self, cid: bytes, data: bytes, after_idat: bool = False) -> None:
         """Appends an arbitrary chunk. Use with caution.
 
         :param cid: a byte string, 4 bytes long.
@@ -283,12 +289,16 @@ def add(self, cid, data, after_idat=False):
 
         """
 
-        chunk = [cid, data]
-        if after_idat:
-            chunk.append(True)
-        self.chunks.append(tuple(chunk))
+        self.chunks.append((cid, data, after_idat))
 
-    def add_itxt(self, key, value, lang="", tkey="", zip=False):
+    def add_itxt(
+        self,
+        key: str | bytes,
+        value: str | bytes,
+        lang: str | bytes = "",
+        tkey: str | bytes = "",
+        zip: bool = False,
+    ) -> None:
         """Appends an iTXt chunk.
 
         :param key: latin-1 encodable text key name
@@ -316,7 +326,9 @@ def add_itxt(self, key, value, lang="", tkey="", zip=False):
         else:
             self.add(b"iTXt", key + b"\0\0\0" + lang + b"\0" + tkey + b"\0" + value)
 
-    def add_text(self, key, value, zip=False):
+    def add_text(
+        self, key: str | bytes, value: str | bytes | iTXt, zip: bool = False
+    ) -> None:
         """Appends a text chunk.
 
         :param key: latin-1 encodable text key name
@@ -326,7 +338,13 @@ def add_text(self, key, value, zip=False):
 
         """
         if isinstance(value, iTXt):
-            return self.add_itxt(key, value, value.lang, value.tkey, zip=zip)
+            return self.add_itxt(
+                key,
+                value,
+                value.lang if value.lang is not None else b"",
+                value.tkey if value.tkey is not None else b"",
+                zip=zip,
+            )
 
         # The tEXt chunk stores latin-1 text
         if not isinstance(value, bytes):
@@ -434,7 +452,7 @@ def chunk_IHDR(self, pos: int, length: int) -> bytes:
             raise SyntaxError(msg)
         return s
 
-    def chunk_IDAT(self, pos, length):
+    def chunk_IDAT(self, pos: int, length: int) -> NoReturn:
         # image data
         if "bbox" in self.im_info:
             tile = [("zip", self.im_info["bbox"], pos, self.im_rawmode)]
@@ -447,7 +465,7 @@ def chunk_IDAT(self, pos, length):
         msg = "image data found"
         raise EOFError(msg)
 
-    def chunk_IEND(self, pos, length):
+    def chunk_IEND(self, pos: int, length: int) -> NoReturn:
         msg = "end of PNG image"
         raise EOFError(msg)
 
@@ -821,7 +839,10 @@ def seek(self, frame: int) -> None:
                 msg = "no more images in APNG file"
                 raise EOFError(msg) from e
 
-    def _seek(self, frame, rewind=False):
+    def _seek(self, frame: int, rewind: bool = False) -> None:
+        assert self.png is not None
+
+        self.dispose: _imaging.ImagingCore | None
         if frame == 0:
             if rewind:
                 self._fp.seek(self.__rewind)
@@ -906,14 +927,14 @@ def _seek(self, frame, rewind=False):
         if self._prev_im is None and self.dispose_op == Disposal.OP_PREVIOUS:
             self.dispose_op = Disposal.OP_BACKGROUND
 
+        self.dispose = None
         if self.dispose_op == Disposal.OP_PREVIOUS:
-            self.dispose = self._prev_im.copy()
-            self.dispose = self._crop(self.dispose, self.dispose_extent)
+            if self._prev_im:
+                self.dispose = self._prev_im.copy()
+                self.dispose = self._crop(self.dispose, self.dispose_extent)
         elif self.dispose_op == Disposal.OP_BACKGROUND:
             self.dispose = Image.core.fill(self.mode, self.size)
             self.dispose = self._crop(self.dispose, self.dispose_extent)
-        else:
-            self.dispose = None
 
     def tell(self) -> int:
         return self.__frame
@@ -1026,7 +1047,7 @@ def _getexif(self) -> dict[str, Any] | None:
             return None
         return self.getexif()._get_merged_dict()
 
-    def getexif(self):
+    def getexif(self) -> Image.Exif:
         if "exif" not in self.info:
             self.load()
 
@@ -1346,7 +1367,7 @@ def _save(im, fp, filename, chunk=putchunk, save_all=False):
                 chunk(fp, cid, data)
             elif cid[1:2].islower():
                 # Private chunk
-                after_idat = info_chunk[2:3]
+                after_idat = len(info_chunk) == 3 and info_chunk[2]
                 if not after_idat:
                     chunk(fp, cid, data)
 
@@ -1425,7 +1446,7 @@ def _save(im, fp, filename, chunk=putchunk, save_all=False):
             cid, data = info_chunk[:2]
             if cid[1:2].islower():
                 # Private chunk
-                after_idat = info_chunk[2:3]
+                after_idat = len(info_chunk) == 3 and info_chunk[2]
                 if after_idat:
                     chunk(fp, cid, data)
 

src/PIL/TiffImagePlugin.py

@@ -50,7 +50,7 @@
 from collections.abc import MutableMapping
 from fractions import Fraction
 from numbers import Number, Rational
-from typing import IO, TYPE_CHECKING, Any, Callable
+from typing import IO, TYPE_CHECKING, Any, Callable, NoReturn
 
 from . import ExifTags, Image, ImageFile, ImageOps, ImagePalette, TiffTags
 from ._binary import i16be as i16
@@ -384,7 +384,7 @@ def limit_rational(self, max_denominator):
     def __repr__(self) -> str:
         return str(float(self._val))
 
-    def __hash__(self):
+    def __hash__(self) -> int:
         return self._val.__hash__()
 
     def __eq__(self, other: object) -> bool:
@@ -551,7 +551,12 @@ class ImageFileDirectory_v2(_IFDv2Base):
     _load_dispatch: dict[int, Callable[[ImageFileDirectory_v2, bytes, bool], Any]] = {}
     _write_dispatch: dict[int, Callable[..., Any]] = {}
 
-    def __init__(self, ifh=b"II\052\0\0\0\0\0", prefix=None, group=None):
+    def __init__(
+        self,
+        ifh: bytes = b"II\052\0\0\0\0\0",
+        prefix: bytes | None = None,
+        group: int | None = None,
+    ) -> None:
         """Initialize an ImageFileDirectory.
 
         To construct an ImageFileDirectory from a real file, pass the 8-byte
@@ -575,7 +580,7 @@ def __init__(self, ifh=b"II\052\0\0\0\0\0", prefix=None, group=None):
             raise SyntaxError(msg)
         self._bigtiff = ifh[2] == 43
         self.group = group
-        self.tagtype = {}
+        self.tagtype: dict[int, int] = {}
         """ Dictionary of tag types """
         self.reset()
         (self.next,) = (
@@ -587,18 +592,18 @@ def __init__(self, ifh=b"II\052\0\0\0\0\0", prefix=None, group=None):
     offset = property(lambda self: self._offset)
 
     @property
-    def legacy_api(self):
+    def legacy_api(self) -> bool:
         return self._legacy_api
 
     @legacy_api.setter
-    def legacy_api(self, value):
+    def legacy_api(self, value: bool) -> NoReturn:
         msg = "Not allowing setting of legacy api"
         raise Exception(msg)
 
-    def reset(self):
-        self._tags_v1 = {}  # will remain empty if legacy_api is false
-        self._tags_v2 = {}  # main tag storage
-        self._tagdata = {}
+    def reset(self) -> None:
+        self._tags_v1: dict[int, Any] = {}  # will remain empty if legacy_api is false
+        self._tags_v2: dict[int, Any] = {}  # main tag storage
+        self._tagdata: dict[int, bytes] = {}
         self.tagtype = {}  # added 2008-06-05 by Florian Hoech
         self._next = None
         self._offset = None
@@ -2039,7 +2044,7 @@ def skipIFDs(self) -> None:
             num_tags = self.readShort()
             self.f.seek(num_tags * 12, os.SEEK_CUR)
 
-    def write(self, data):
+    def write(self, data: bytes) -> int | None:
         return self.f.write(data)
 
     def readShort(self) -> int:
@@ -2122,7 +2127,9 @@ def fixIFD(self) -> None:
                 # skip the locally stored value that is not an offset
                 self.f.seek(4, os.SEEK_CUR)
 
-    def fixOffsets(self, count, isShort=False, isLong=False):
+    def fixOffsets(
+        self, count: int, isShort: bool = False, isLong: bool = False
+    ) -> None:
         if not isShort and not isLong:
             msg = "offset is neither short nor long"
             raise RuntimeError(msg)

src/PIL/_imaging.pyi

@@ -12,5 +12,5 @@ class ImagingDraw:
 class PixelAccess:
     def __getattr__(self, name: str) -> Any: ...
 
-def font(image, glyphdata: bytes) -> ImagingFont: ...
+def font(image: ImagingCore, glyphdata: bytes) -> ImagingFont: ...
 def __getattr__(name: str) -> Any: ...