Added type hints

Tests/test_qt_image_qapplication.py

@@ -1,6 +1,7 @@
 from __future__ import annotations
 
 from pathlib import Path
+from typing import TYPE_CHECKING, Union
 
 import pytest
 
@@ -8,6 +9,20 @@ from PIL import Image, ImageQt
 
 from .helper import assert_image_equal_tofile, assert_image_similar, hopper
 
+if TYPE_CHECKING:
+    import PyQt6
+    import PySide6
+
+    QApplication = Union[PyQt6.QtWidgets.QApplication, PySide6.QtWidgets.QApplication]
+    QHBoxLayout = Union[PyQt6.QtWidgets.QHBoxLayout, PySide6.QtWidgets.QHBoxLayout]
+    QImage = Union[PyQt6.QtGui.QImage, PySide6.QtGui.QImage]
+    QLabel = Union[PyQt6.QtWidgets.QLabel, PySide6.QtWidgets.QLabel]
+    QPainter = Union[PyQt6.QtGui.QPainter, PySide6.QtGui.QPainter]
+    QPixmap = Union[PyQt6.QtGui.QPixmap, PySide6.QtGui.QPixmap]
+    QPoint = Union[PyQt6.QtCore.QPoint, PySide6.QtCore.QPoint]
+    QRegion = Union[PyQt6.QtGui.QRegion, PySide6.QtGui.QRegion]
+    QWidget = Union[PyQt6.QtWidgets.QWidget, PySide6.QtWidgets.QWidget]
+
 if ImageQt.qt_is_installed:
     from PIL.ImageQt import QPixmap
 
@@ -20,7 +35,7 @@ if ImageQt.qt_is_installed:
         from PySide6.QtGui import QImage, QPainter, QRegion
         from PySide6.QtWidgets import QApplication, QHBoxLayout, QLabel, QWidget
 
-    class Example(QWidget):
+    class Example(QWidget):  # type: ignore[misc]
         def __init__(self) -> None:
             super().__init__()
 
@@ -28,11 +43,12 @@ if ImageQt.qt_is_installed:
 
             qimage = ImageQt.ImageQt(img)
 
-            pixmap1 = ImageQt.QPixmap.fromImage(qimage)
+            pixmap1 = getattr(ImageQt.QPixmap, "fromImage")(qimage)
 
-            QHBoxLayout(self)  # hbox
+            # hbox
+            QHBoxLayout(self)  # type: ignore[operator]
 
-            lbl = QLabel(self)
+            lbl = QLabel(self)  # type: ignore[operator]
             # Segfault in the problem
             lbl.setPixmap(pixmap1.copy())
 
@@ -46,7 +62,7 @@ def roundtrip(expected: Image.Image) -> None:
 @pytest.mark.skipif(not ImageQt.qt_is_installed, reason="Qt bindings are not installed")
 def test_sanity(tmp_path: Path) -> None:
     # Segfault test
-    app: QApplication | None = QApplication([])
+    app: QApplication | None = QApplication([])  # type: ignore[operator]
     ex = Example()
     assert app  # Silence warning
     assert ex  # Silence warning
@@ -56,7 +72,7 @@ def test_sanity(tmp_path: Path) -> None:
         im = hopper(mode)
         data = ImageQt.toqpixmap(im)
 
-        assert isinstance(data, QPixmap)
+        assert data.__class__.__name__ == "QPixmap"
         assert not data.isNull()
 
         # Test saving the file
@@ -64,14 +80,14 @@ def test_sanity(tmp_path: Path) -> None:
         data.save(tempfile)
 
         # Render the image
-        qimage = ImageQt.ImageQt(im)
-        data = QPixmap.fromImage(qimage)
-        qt_format = QImage.Format if ImageQt.qt_version == "6" else QImage
-        qimage = QImage(128, 128, qt_format.Format_ARGB32)
-        painter = QPainter(qimage)
-        image_label = QLabel()
+        imageqt = ImageQt.ImageQt(im)
+        data = getattr(QPixmap, "fromImage")(imageqt)
+        qt_format = getattr(QImage, "Format") if ImageQt.qt_version == "6" else QImage
+        qimage = QImage(128, 128, getattr(qt_format, "Format_ARGB32"))  # type: ignore[operator]
+        painter = QPainter(qimage)  # type: ignore[operator]
+        image_label = QLabel()  # type: ignore[operator]
         image_label.setPixmap(data)
-        image_label.render(painter, QPoint(0, 0), QRegion(0, 0, 128, 128))
+        image_label.render(painter, QPoint(0, 0), QRegion(0, 0, 128, 128))  # type: ignore[operator]
         painter.end()
         rendered_tempfile = str(tmp_path / f"temp_rendered_{mode}.png")
         qimage.save(rendered_tempfile)

Tests/test_qt_image_toqimage.py

@@ -21,7 +21,7 @@ def test_sanity(mode: str, tmp_path: Path) -> None:
     src = hopper(mode)
     data = ImageQt.toqimage(src)
 
-    assert isinstance(data, QImage)
+    assert isinstance(data, QImage)  # type: ignore[arg-type, misc]
     assert not data.isNull()
 
     # reload directly from the qimage

pyproject.toml

@@ -166,5 +166,4 @@ warn_unused_ignores = true
 exclude = [
   '^Tests/oss-fuzz/fuzz_font.py$',
   '^Tests/oss-fuzz/fuzz_pillow.py$',
-  '^Tests/test_qt_image_qapplication.py$',
 ]

src/PIL/EpsImagePlugin.py

@@ -71,7 +71,7 @@ def Ghostscript(
     fp: IO[bytes],
     scale: int = 1,
     transparency: bool = False,
-) -> Image.Image:
+) -> Image.core.ImagingCore:
     """Render an image using Ghostscript"""
     global gs_binary
     if not has_ghostscript():

src/PIL/Image.py

@@ -223,7 +223,7 @@ if TYPE_CHECKING:
 
     from IPython.lib.pretty import PrettyPrinter
 
-    from . import ImageFile, ImageFilter, ImagePalette, TiffImagePlugin
+    from . import ImageFile, ImageFilter, ImagePalette, ImageQt, TiffImagePlugin
     from ._typing import NumpyArray, StrOrBytesPath, TypeGuard
 ID: list[str] = []
 OPEN: dict[
@@ -2978,7 +2978,7 @@ class Image:
         self.load()
         return self._new(self.im.effect_spread(distance))
 
-    def toqimage(self):
+    def toqimage(self) -> ImageQt.ImageQt:
         """Returns a QImage copy of this image"""
         from . import ImageQt
 
@@ -2987,7 +2987,7 @@ class Image:
             raise ImportError(msg)
         return ImageQt.toqimage(self)
 
-    def toqpixmap(self):
+    def toqpixmap(self) -> ImageQt.QPixmap:
         """Returns a QPixmap copy of this image"""
         from . import ImageQt
 
@@ -3314,7 +3314,7 @@ def fromarray(obj: SupportsArrayInterface, mode: str | None = None) -> Image:
     return frombuffer(mode, size, obj, "raw", rawmode, 0, 1)
 
 
-def fromqimage(im) -> ImageFile.ImageFile:
+def fromqimage(im: ImageQt.QImage) -> ImageFile.ImageFile:
     """Creates an image instance from a QImage image"""
     from . import ImageQt
 
@@ -3324,7 +3324,7 @@ def fromqimage(im) -> ImageFile.ImageFile:
     return ImageQt.fromqimage(im)
 
 
-def fromqpixmap(im) -> ImageFile.ImageFile:
+def fromqpixmap(im: ImageQt.QPixmap) -> ImageFile.ImageFile:
     """Creates an image instance from a QPixmap image"""
     from . import ImageQt
 

src/PIL/ImageQt.py

@@ -19,14 +19,23 @@ from __future__ import annotations
 
 import sys
 from io import BytesIO
-from typing import TYPE_CHECKING, Callable
+from typing import TYPE_CHECKING, Any, Callable, Union
 
 from . import Image
 from ._util import is_path
 
 if TYPE_CHECKING:
+    import PyQt6
+    import PySide6
+
     from . import ImageFile
 
+    QBuffer: type
+    QByteArray = Union[PyQt6.QtCore.QByteArray, PySide6.QtCore.QByteArray]
+    QIODevice = Union[PyQt6.QtCore.QIODevice, PySide6.QtCore.QIODevice]
+    QImage = Union[PyQt6.QtGui.QImage, PySide6.QtGui.QImage]
+    QPixmap = Union[PyQt6.QtGui.QPixmap, PySide6.QtGui.QPixmap]
+
 qt_version: str | None
 qt_versions = [
     ["6", "PyQt6"],
@@ -37,10 +46,6 @@ qt_versions = [
 qt_versions.sort(key=lambda version: version[1] in sys.modules, reverse=True)
 for version, qt_module in qt_versions:
     try:
-        QBuffer: type
-        QIODevice: type
-        QImage: type
-        QPixmap: type
         qRgba: Callable[[int, int, int, int], int]
         if qt_module == "PyQt6":
             from PyQt6.QtCore import QBuffer, QIODevice
@@ -65,19 +70,20 @@ def rgb(r: int, g: int, b: int, a: int = 255) -> int:
     return qRgba(r, g, b, a) & 0xFFFFFFFF
 
 
-def fromqimage(im):
+def fromqimage(im: QImage | QPixmap) -> ImageFile.ImageFile:
     """
     :param im: QImage or PIL ImageQt object
     """
     buffer = QBuffer()
+    qt_openmode: object
     if qt_version == "6":
         try:
-            qt_openmode = QIODevice.OpenModeFlag
+            qt_openmode = getattr(QIODevice, "OpenModeFlag")
         except AttributeError:
-            qt_openmode = QIODevice.OpenMode
+            qt_openmode = getattr(QIODevice, "OpenMode")
     else:
         qt_openmode = QIODevice
-    buffer.open(qt_openmode.ReadWrite)
+    buffer.open(getattr(qt_openmode, "ReadWrite"))
     # preserve alpha channel with png
     # otherwise ppm is more friendly with Image.open
     if im.hasAlphaChannel():
@@ -93,7 +99,7 @@ def fromqimage(im):
     return Image.open(b)
 
 
-def fromqpixmap(im) -> ImageFile.ImageFile:
+def fromqpixmap(im: QPixmap) -> ImageFile.ImageFile:
     return fromqimage(im)
 
 
@@ -123,7 +129,7 @@ def align8to32(bytes: bytes, width: int, mode: str) -> bytes:
     return b"".join(new_data)
 
 
-def _toqclass_helper(im):
+def _toqclass_helper(im: Image.Image | str | QByteArray) -> dict[str, Any]:
     data = None
     colortable = None
     exclusive_fp = False
@@ -135,30 +141,32 @@ def _toqclass_helper(im):
     if is_path(im):
         im = Image.open(im)
         exclusive_fp = True
+    assert isinstance(im, Image.Image)
 
-    qt_format = QImage.Format if qt_version == "6" else QImage
+    qt_format = getattr(QImage, "Format") if qt_version == "6" else QImage
     if im.mode == "1":
-        format = qt_format.Format_Mono
+        format = getattr(qt_format, "Format_Mono")
     elif im.mode == "L":
-        format = qt_format.Format_Indexed8
+        format = getattr(qt_format, "Format_Indexed8")
         colortable = [rgb(i, i, i) for i in range(256)]
     elif im.mode == "P":
-        format = qt_format.Format_Indexed8
+        format = getattr(qt_format, "Format_Indexed8")
         palette = im.getpalette()
+        assert palette is not None
         colortable = [rgb(*palette[i : i + 3]) for i in range(0, len(palette), 3)]
     elif im.mode == "RGB":
         # Populate the 4th channel with 255
         im = im.convert("RGBA")
 
         data = im.tobytes("raw", "BGRA")
-        format = qt_format.Format_RGB32
+        format = getattr(qt_format, "Format_RGB32")
     elif im.mode == "RGBA":
         data = im.tobytes("raw", "BGRA")
-        format = qt_format.Format_ARGB32
+        format = getattr(qt_format, "Format_ARGB32")
     elif im.mode == "I;16":
         im = im.point(lambda i: i * 256)
 
-        format = qt_format.Format_Grayscale16
+        format = getattr(qt_format, "Format_Grayscale16")
     else:
         if exclusive_fp:
             im.close()
@@ -174,8 +182,8 @@ def _toqclass_helper(im):
 
 if qt_is_installed:
 
-    class ImageQt(QImage):
-        def __init__(self, im) -> None:
+    class ImageQt(QImage):  # type: ignore[misc]
+        def __init__(self, im: Image.Image | str | QByteArray) -> None:
             """
             An PIL image wrapper for Qt.  This is a subclass of PyQt's QImage
             class.
@@ -199,10 +207,10 @@ if qt_is_installed:
                 self.setColorTable(im_data["colortable"])
 
 
-def toqimage(im) -> ImageQt:
+def toqimage(im: Image.Image | str | QByteArray) -> ImageQt:
     return ImageQt(im)
 
 
-def toqpixmap(im):
+def toqpixmap(im: Image.Image | str | QByteArray) -> QPixmap:
     qimage = toqimage(im)
-    return QPixmap.fromImage(qimage)
+    return getattr(QPixmap, "fromImage")(qimage)