fix(linux/pipewire): Add 10-bit RGB formats with 2-bit Alpha to format_map

[flibitijibibo]

Description

The current PipeWire implementation only checks for xBGR2101010 - this isn't always advertised however; KWin for example may only expose formats with alpha:

https://invent.kde.org/plasma/kwin/-/merge_requests/8293/diffs#7390a641bee8f53acd66ba70f27e53b223cfaa18_88_84

With some fixes to the KWin MR, this allows HDR streaming to work with portalgrab:

[2026-05-08 15:15:05.282]: Info: [pipewire] Connected to pipewire version 1.6.4
[2026-05-08 15:15:05.286]: Info: [pipewire] Video format: 87
[2026-05-08 15:15:05.286]: Info: [pipewire] Size: 3840x2160
[2026-05-08 15:15:05.286]: Info: [pipewire] Color primaries: 7
[2026-05-08 15:15:05.286]: Info: [pipewire] Transfer function: 14
[2026-05-08 15:15:05.286]: Info: [pipewire] Framerate (from compositor): 0/1 (variable rate capture)
[2026-05-08 15:15:05.286]: Info: [pipewire] using DMA-BUF buffers
[2026-05-08 15:15:05.286]: Info: [pipewire] Video format: 87
[2026-05-08 15:15:05.286]: Info: [pipewire] Size: 3840x2160
[2026-05-08 15:15:05.286]: Info: [pipewire] Color primaries: 7
[2026-05-08 15:15:05.286]: Info: [pipewire] Transfer function: 14
[2026-05-08 15:15:05.286]: Info: [pipewire] Framerate (from compositor): 0/1 (variable rate capture)
[2026-05-08 15:15:05.286]: Info: [pipewire] using DMA-BUF buffers
[2026-05-08 15:15:05.292]: Info: [pipewire] Using negotiated Resolution: 3840x2160

Screenshot

Issues Fixed or Closed

Roadmap Issues

Type of Change

• feat: New feature (non-breaking change which adds functionality)
• fix: Bug fix (non-breaking change which fixes an issue)
• docs: Documentation only changes
• style: Changes that do not affect the meaning of the code (white-space, formatting, missing semicolons, etc.)
• refactor: Code change that neither fixes a bug nor adds a feature
• perf: Code change that improves performance
• test: Adding missing tests or correcting existing tests
• build: Changes that affect the build system or external dependencies
• ci: Changes to CI configuration files and scripts
• chore: Other changes that don't modify src or test files
• revert: Reverts a previous commit
• BREAKING CHANGE: Introduces a breaking change (can be combined with any type above)

Checklist

• Code follows the style guidelines of this project
• Code has been self-reviewed
• Code has been commented, particularly in hard-to-understand areas
• Code docstring/documentation-blocks for new or existing methods/components have been added or updated
• Unit tests have been added or updated for any new or modified functionality

AI Usage

• None: No AI tools were used in creating this PR
• Light: AI provided minor assistance (formatting, simple suggestions)
• Moderate: AI helped with code generation or debugging specific parts
• Heavy: AI generated most or all of the code changes

[Kishi85]

I'm lacking the necessary HDR hardware but after testing at least I can't see any regressions for SDR with this applied.

Maybe @garnacho or someone else can comment on HDR? Otherwise this change is looking good to me.

[sonarqubecloud]

Quality Gate passed

Issues
0 New issues
0 Accepted issues

Measures
0 Security Hotspots
0.0% Coverage on New Code
0.0% Duplication on New Code

See analysis details on SonarQube Cloud

[codecov]

Bundle Report

Bundle size has no change ✅

[codecov]

Codecov Report

✅ All modified and coverable lines are covered by tests.
✅ Project coverage is 17.83%. Comparing base (0709990) to head (4166ab1).
✅ All tests successful. No failed tests found.

Additional details and impacted files

@@            Coverage Diff             @@
##           master    #5088      +/-   ##
==========================================
- Coverage   17.86%   17.83%   -0.03%     
==========================================
  Files         111      111              
  Lines       24005    24005              
  Branches    10619    10619              
==========================================
- Hits         4289     4282       -7     
+ Misses      18169    15542    -2627     
- Partials     1547     4181    +2634     

Flag	Coverage Δ
Archlinux	11.23% <ø> (ø)
FreeBSD-14.3-aarch64	?
FreeBSD-14.3-amd64	13.37% <ø> (+0.01%)	⬆️
Homebrew-ubuntu-22.04	13.58% <ø> (ø)
Linux-AppImage	12.16% <ø> (ø)
Windows-AMD64	14.84% <ø> (ø)
Windows-ARM64	13.23% <ø> (-0.01%)	⬇️
macOS-arm64	19.03% <ø> (ø)
macOS-x86_64	18.39% <ø> (+0.01%)	⬆️

Flags with carried forward coverage won't be shown. Click here to find out more.

Files with missing lines	Coverage Δ
src/platform/linux/pipewire.cpp	0.00% <ø> (ø)

... and 50 files with indirect coverage changes

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