Steam Deck Gamingmode fix

[safijari]

Description

Added a function to check panel orientation in kmsgrab and for the case when the orientation is 270 implemented swapping width and height. This change allows the Steam deck gamingmode to stream correctly.

Type of Change

• Bug fix (non-breaking change which fixes an issue)
• New feature (non-breaking change which adds functionality)
• Breaking change (fix or feature that would cause existing functionality to not work as expected)
• Dependency update (updates to dependencies)
• Documentation update (changes to documentation)
• Repository update (changes to repository files, e.g. .github/...)

Checklist

• My code follows the style guidelines of this project
• I have performed a self-review of my own code
• I have commented my code, particularly in hard-to-understand areas
• I have added or updated the in code docstring/documentation-blocks for new or existing methods/components

Branch Updates

LizardByte requires that branches be up-to-date before merging. This means that after any PR is merged, this branch
must be updated before it can be merged. You must also
Allow edits from maintainers.

• I want maintainers to keep my branch updated

[CLAassistant]

All committers have signed the CLA.

[ReenigneArcher]

Will also need to update the docs (i.e. Advanced Usage section).

I will try to find how to use a checkbox, but I think it's a bit more complicated.

[psyke83]

I'm not sure if this is a suitable fix?

There should be properties that can be queried to know the orientation. See drm_panel_orientation at: https://docs.kernel.org/gpu/drm-kms.html

[safijari]

@psyke83 I have removed the configuration option and instead do the width/height swap based on panel orientation. I have tested this on the steam deck and it works correctly. I can't test it on a regular landscape display because I'm an X11 peasant, but there isn't a reason to believe that would break. I'm not sure what to do with 90 and 270 as they require a flip to happen.

Edit: I tested the landscape orientation by connecting the Deck to a monitor. Everything works fine.