PyQt6 Support

[Aulla]

Hi everyone!. I'm updating my app to PyQt6 and found a problem.

ImageQt.ImageQt class raises an error when try to use with QPainter:

>>> page_image = ImageQt.ImageQt(page)
>>> painter = QtGui.QPainter()
>>> painter.begin(page_image)
TypeError: begin(self, QPaintDevice): argument 1 has unexpected type 'ImageQt'

Regards

Python 3.8.6
Ubuntu 20.04
PyQt6 6.0.1
Pillow 8.1.0

[radarhere]

Hi. ImageQt subclasses QImage, and QImage subclasses QPaintDevice, so I don't see an obvious reason why this shouldn't work.

Are you saying that this code worked with PyQt5?

[Aulla]

Hello, Yes, works fine with PyQt5. the problem is that inside ImageQt.py there is a list to know which package contains the class to search for.

qt_versions = [
    ["side6", "PySide6"],
    ["5", "PyQt5"],
    ["side2", "PySide2"],
].

As PyQt6 is not defined, it cannot know which package provides each Class a little lower.

# If a version has already been imported, attempt it first
qt_versions.sort (key = lambda qt_version: qt_version [1] in sys.modules, reverse = True)
for qt_version, qt_module in qt_versions:
    try:
        if qt_module == "PySide6":
            from PySide6.QtCore import QBuffer, QIODevice
            from PySide6.QtGui import QImage, QPixmap, qRgba
        elif qt_module == "PyQt5":
            from PyQt5.QtCore import QBuffer, QIODevice
            from PyQt5.QtGui import QImage, QPixmap, qRgba
        elif qt_module == "PySide2":
            from PySide2.QtCore import QBuffer, QIODevice
            from PySide2.QtGui import QImage, QPixmap, qRgba
    except (ImportError, RuntimeError):
        continue
    qt_is_installed = True
    break
else:
    qt_is_installed = False
    qt_version = None

Another problem that exists is the regrouping of the Enums, for example:
QImage.Format_RGB32
change to :
QImage.Format.Format_RGB32

Regards.

[radarhere]

Ah, I misunderstood. I thought you meant something specific to the code you mentioned.

I've created #5258 to add support. If you could test it and let us know if it works for you, that could be helpful.

[Aulla]

with the changes ... begin(self, QPaintDevice): argument 1 has unexpected type 'ImageQt'.

Original QImage is need for class ImageQt parent, not OpenMode. import OpenMode as QIODevice also gives problems.

[radarhere]

Ok, thanks for checking. I've updated the PR if you wanted to try again.

[Aulla]

the new changes works Ok! . Thanks!!

[hugovk]

Thanks both! Merging, it'll be in the next release at the start of April.