Added type hints

src/PIL/GifImagePlugin.py

@@ -558,7 +558,11 @@ def _normalize_palette(im, palette, info):
     return im
 
 
-def _write_single_frame(im, fp, palette):
+def _write_single_frame(
+    im: Image.Image,
+    fp: IO[bytes],
+    palette: bytes | bytearray | list[int] | ImagePalette.ImagePalette,
+) -> None:
     im_out = _normalize_mode(im)
     for k, v in im_out.info.items():
         im.encoderinfo.setdefault(k, v)
@@ -579,7 +583,9 @@ def _write_single_frame(im, fp, palette):
     fp.write(b"\0")  # end of image data
 
 
-def _getbbox(base_im, im_frame):
+def _getbbox(
+    base_im: Image.Image, im_frame: Image.Image
+) -> tuple[Image.Image, tuple[int, int, int, int]]:
     if _get_palette_bytes(im_frame) != _get_palette_bytes(base_im):
         im_frame = im_frame.convert("RGBA")
         base_im = base_im.convert("RGBA")
@@ -790,7 +796,7 @@ def _write_local_header(fp, im, offset, flags):
     fp.write(o8(8))  # bits
 
 
-def _save_netpbm(im, fp, filename):
+def _save_netpbm(im: Image.Image, fp: IO[bytes], filename: str) -> None:
     # Unused by default.
     # To use, uncomment the register_save call at the end of the file.
     #
@@ -821,6 +827,7 @@ def _save_netpbm(im, fp, filename):
                 )
 
                 # Allow ppmquant to receive SIGPIPE if ppmtogif exits
+                assert quant_proc.stdout is not None
                 quant_proc.stdout.close()
 
                 retcode = quant_proc.wait()
@@ -1080,7 +1087,7 @@ def getdata(im, offset=(0, 0), **params):
     class Collector:
         data = []
 
-        def write(self, data):
+        def write(self, data: bytes) -> None:
             self.data.append(data)
 
     im.load()  # make sure raster data is available

src/PIL/GimpGradientFile.py

@@ -21,6 +21,7 @@ See the GIMP distribution for more information.)
 from __future__ import annotations
 
 from math import log, pi, sin, sqrt
+from typing import IO, Callable
 
 from ._binary import o8
 
@@ -28,7 +29,7 @@ EPSILON = 1e-10
 """"""  # Enable auto-doc for data member
 
 
-def linear(middle, pos):
+def linear(middle: float, pos: float) -> float:
     if pos <= middle:
         if middle < EPSILON:
             return 0.0
@@ -43,19 +44,19 @@ def linear(middle, pos):
             return 0.5 + 0.5 * pos / middle
 
 
-def curved(middle, pos):
+def curved(middle: float, pos: float) -> float:
     return pos ** (log(0.5) / log(max(middle, EPSILON)))
 
 
-def sine(middle, pos):
+def sine(middle: float, pos: float) -> float:
     return (sin((-pi / 2.0) + pi * linear(middle, pos)) + 1.0) / 2.0
 
 
-def sphere_increasing(middle, pos):
+def sphere_increasing(middle: float, pos: float) -> float:
     return sqrt(1.0 - (linear(middle, pos) - 1.0) ** 2)
 
 
-def sphere_decreasing(middle, pos):
+def sphere_decreasing(middle: float, pos: float) -> float:
     return 1.0 - sqrt(1.0 - linear(middle, pos) ** 2)
 
 
@@ -64,9 +65,22 @@ SEGMENTS = [linear, curved, sine, sphere_increasing, sphere_decreasing]
 
 
 class GradientFile:
-    gradient = None
+    gradient: (
+        list[
+            tuple[
+                float,
+                float,
+                float,
+                list[float],
+                list[float],
+                Callable[[float, float], float],
+            ]
+        ]
+        | None
+    ) = None
 
-    def getpalette(self, entries=256):
+    def getpalette(self, entries: int = 256) -> tuple[bytes, str]:
+        assert self.gradient is not None
         palette = []
 
         ix = 0
@@ -101,7 +115,7 @@ class GradientFile:
 class GimpGradientFile(GradientFile):
     """File handler for GIMP's gradient format."""
 
-    def __init__(self, fp):
+    def __init__(self, fp: IO[bytes]) -> None:
         if fp.readline()[:13] != b"GIMP Gradient":
             msg = "not a GIMP gradient file"
             raise SyntaxError(msg)
@@ -114,7 +128,16 @@ class GimpGradientFile(GradientFile):
 
         count = int(line)
 
-        gradient = []
+        gradient: list[
+            tuple[
+                float,
+                float,
+                float,
+                list[float],
+                list[float],
+                Callable[[float, float], float],
+            ]
+        ] = []
 
         for i in range(count):
             s = fp.readline().split()

src/PIL/Image.py

@@ -2470,7 +2470,7 @@ class Image:
 
         save_all = params.pop("save_all", False)
         self.encoderinfo = params
-        self.encoderconfig = ()
+        self.encoderconfig: tuple[Any, ...] = ()
 
         preinit()
 

src/PIL/ImageDraw2.py

@@ -30,7 +30,7 @@ from . import Image, ImageColor, ImageDraw, ImageFont, ImagePath
 class Pen:
     """Stores an outline color and width."""
 
-    def __init__(self, color, width=1, opacity=255):
+    def __init__(self, color: str, width: int = 1, opacity: int = 255) -> None:
         self.color = ImageColor.getrgb(color)
         self.width = width
 
@@ -38,7 +38,7 @@ class Pen:
 class Brush:
     """Stores a fill color"""
 
-    def __init__(self, color, opacity=255):
+    def __init__(self, color: str, opacity: int = 255) -> None:
         self.color = ImageColor.getrgb(color)
 
 
@@ -63,7 +63,7 @@ class Draw:
         self.image = image
         self.transform = None
 
-    def flush(self):
+    def flush(self) -> Image.Image:
         return self.image
 
     def render(self, op, xy, pen, brush=None):

src/PIL/ImageTk.py

@@ -37,7 +37,7 @@ from . import Image
 _pilbitmap_ok = None
 
 
-def _pilbitmap_check():
+def _pilbitmap_check() -> int:
     global _pilbitmap_ok
     if _pilbitmap_ok is None:
         try:
@@ -162,7 +162,7 @@ class PhotoImage:
         """
         return self.__size[1]
 
-    def paste(self, im):
+    def paste(self, im: Image.Image) -> None:
         """
         Paste a PIL image into the photo image.  Note that this can
         be very slow if the photo image is displayed.
@@ -254,7 +254,7 @@ class BitmapImage:
         return str(self.__photo)
 
 
-def getimage(photo):
+def getimage(photo: PhotoImage) -> Image.Image:
     """Copies the contents of a PhotoImage to a PIL image memory."""
     im = Image.new("RGBA", (photo.width(), photo.height()))
     block = im.im

src/PIL/Jpeg2KImagePlugin.py

@@ -18,6 +18,7 @@ from __future__ import annotations
 import io
 import os
 import struct
+from typing import IO
 
 from . import Image, ImageFile, ImagePalette, _binary
 
@@ -328,7 +329,7 @@ def _accept(prefix: bytes) -> bool:
 # Save support
 
 
-def _save(im, fp, filename):
+def _save(im: Image.Image, fp: IO[bytes], filename: str) -> None:
     # Get the keyword arguments
     info = im.encoderinfo
 

src/PIL/PaletteFile.py

@@ -14,6 +14,8 @@
 #
 from __future__ import annotations
 
+from typing import IO
+
 from ._binary import o8
 
 
@@ -22,8 +24,8 @@ class PaletteFile:
 
     rawmode = "RGB"
 
-    def __init__(self, fp):
+    def __init__(self, fp: IO[bytes]) -> None:
-        self.palette = [(i, i, i) for i in range(256)]
+        palette = [o8(i) * 3 for i in range(256)]
 
         while True:
             s = fp.readline()
@@ -44,9 +46,9 @@ class PaletteFile:
                 g = b = r
 
             if 0 <= i <= 255:
-                self.palette[i] = o8(r) + o8(g) + o8(b)
+                palette[i] = o8(r) + o8(g) + o8(b)
 
-        self.palette = b"".join(self.palette)
+        self.palette = b"".join(palette)
 
     def getpalette(self) -> tuple[bytes, str]:
         return self.palette, self.rawmode

src/PIL/TiffImagePlugin.py

@@ -50,7 +50,7 @@ import warnings
 from collections.abc import MutableMapping
 from fractions import Fraction
 from numbers import Number, Rational
-from typing import TYPE_CHECKING, Any, Callable
+from typing import IO, TYPE_CHECKING, Any, Callable
 
 from . import ExifTags, Image, ImageFile, ImageOps, ImagePalette, TiffTags
 from ._binary import i16be as i16
@@ -2149,7 +2149,7 @@ class AppendingTiffWriter:
                 self.rewriteLastLong(offset)
 
 
-def _save_all(im, fp, filename):
+def _save_all(im: Image.Image, fp: IO[bytes], filename: str) -> None:
     encoderinfo = im.encoderinfo.copy()
     encoderconfig = im.encoderconfig
     append_images = list(encoderinfo.get("append_images", []))