Improve ocioview mac support and simplify dependencies

[remia]

This is the branch I shared earlier with some fixes to make it launch on my version of mac OS. I'll leave that in Draft for the time being as there are still some rough edges and I haven't confirmed if this is due to my changes or just the current development state.

• Migration to PySide6
• Remove imath and use numpy instead
• Make OIIO optional and use imageio if not found

To comment on last week TSC discussion, adding a "bookmark" with Ctrl+Number then toggling the current output at the top of the viewer does refresh the image correctly for me.

Note that I originally tried to run it with PySide2 but got stuck with errors like this one and gave up after some time as it seemed easier to just migrate on version 6 which just works out of the box.

Traceback (most recent call last):
  File "/Users/remi/ColorCode/OpenColorIO/src/apps/ocioview/main.py", line 13, in <module>
    from ocioview.main_window import OCIOView
  File "/Users/remi/ColorCode/OpenColorIO/src/apps/ocioview/ocioview/main_window.py", line 13, in <module>
    from .config_dock import ConfigDock
  File "/Users/remi/ColorCode/OpenColorIO/src/apps/ocioview/ocioview/config_dock.py", line 9, in <module>
    from .items import (
  File "/Users/remi/ColorCode/OpenColorIO/src/apps/ocioview/ocioview/items/__init__.py", line 4, in <module>
    from .color_space_edit import ColorSpaceEdit
  File "/Users/remi/ColorCode/OpenColorIO/src/apps/ocioview/ocioview/items/color_space_edit.py", line 12, in <module>
    from ..widgets import (
  File "/Users/remi/ColorCode/OpenColorIO/src/apps/ocioview/ocioview/widgets/__init__.py", line 15, in <module>
    from .list_widget import StringListWidget, ItemModelListWidget
  File "/Users/remi/ColorCode/OpenColorIO/src/apps/ocioview/ocioview/widgets/list_widget.py", line 10, in <module>
    from .item_view import BaseItemView
  File "/Users/remi/ColorCode/OpenColorIO/src/apps/ocioview/ocioview/widgets/item_view.py", line 14, in <module>
    class BaseItemView(QtWidgets.QFrame):
  File "/Users/remi/ColorCode/OpenColorIO/src/apps/ocioview/ocioview/widgets/item_view.py", line 24, in BaseItemView
    QtCore.Qt.ItemIsEnabled | QtCore.Qt.ItemIsEditable | QtCore.Qt.ItemIsSelectable
                                                         ^^^^^^
TypeError: 'PySide2.QtCore.Qt.ItemFlag' object cannot be interpreted as an integer

[KelSolaar]

Moving to PySide 6 makes sense anyway, the VFX Reference Platform 2024 is on Qt 6.

[michdolan]

as there are still some rough edges and I haven't confirmed if this is due to my changes or just the current development state.

Any specific issues you are seeing?

[linux-foundation-easycla]

The committers listed above are authorized under a signed CLA.

• ✅ login: remia / name: Rémi Achard (b0b47d0, 86be306)
• ✅ login: KelSolaar / name: Thomas Mansencal (99f7c07)
• ✅ login: michdolan / name: Michael Dolan (c1fa6d7)

[remia]

Any specific issues you are seeing?

I took a look again today, using this branch (on a Windows workstation though). I realised I broke the pixel probe by adding the imageio support so fixed that in the new commit. I still see an issue with bookmarks switching: when assigning views from different displays (eg. ACES SDR from sRGB and Rec.2100), the switch don't work unless the display you want to switch to is selected in the right panel, hopefully that make sense? Otherwise it seems to work pretty well.

[michdolan]

There are some bookmark changes in PR #1845 which may resolve the issue you are seeing. See:

https://github.com/AcademySoftwareFoundation/OpenColorIO/pull/1845/files#diff-174a130d87ad127f271fc81ffed6fc91ee3fc7237203d4ac6ba63233149b1c07

https://github.com/AcademySoftwareFoundation/OpenColorIO/pull/1845/files#diff-b1c07afbe47f976c8df81907f57689abb516a7ea119714bae093bb950ea47eb7

[KelSolaar]

The branch has been generally working for me, I think it would be useful to merge it so that we can move forward. We can fix problems as they come!

[remia]

This should be ready to merge, sorry about rebasing it may reset the review status of Github unfortunately.

[KelSolaar]

LGTM, lets roll!

[KelSolaar]

Nice!