protocols: add treeland-cross-subsurface-unstable-v1#56
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Add a new protocol and its design document for cross-process sub-surface compositing. treeland_cross_subsurface_unstable_v1 extends wl_subcompositor semantics to surfaces belonging to different client connections. Surfaces are exported via treeland_exported_surface_v1, receiving a numeric surface_id that can be shared out-of-band. A remote client attaches its own wl_surface as a sub-surface by passing the parent's surface_id to create_remote_subsurface, obtaining a treeland_remote_subsurface_v1 that mirrors the full wl_subsurface API (set_position, place_above/below, set_sync/desync). Standard wl_subcompositor sub-surfaces created under an exported surface are automatically tracked by the compositor and reported via child_entered / child_left, assigning them a subsurface_id that participates in the same numeric namespace. The primary motivation is Wine's winewayland.drv, where GPU-rendered child windows belonging to a different Wine process cannot attach their wl_surface as a sub-surface of the parent's surface today. docs/cross-subsurface-design.md documents the background, design rationale, compositor implementation notes, Wine integration plan, and a comparison with xdg-foreign-v2.
- CMakeLists.txt: add new XML to the installed XML list - protocol: add RFC 2119 normative-terms paragraph to top-level description (the spec uses 'must'/'should' normatively) - export_surface: note that re-exporting the same surface results in a bad_surface error - create_remote_subsurface: state explicitly that a bad_surface error is posted when the surface already carries a conflicting role, and that a bad_parent_id error is posted for an unknown or destroyed parent_id - parent_destroyed event: document the two compositor-side trigger conditions (export revoked via destroy request; underlying wl_surface destroyed)
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[APPROVALNOTIFIER] This PR is NOT APPROVED This pull-request has been approved by: wineee The full list of commands accepted by this bot can be found here. DetailsNeeds approval from an approver in each of these files:Approvers can indicate their approval by writing |
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TAG Bot New tag: 0.5.7 |
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Add a new protocol and its design document for cross-process
sub-surface compositing.
treeland_cross_subsurface_unstable_v1 extends wl_subcompositor
semantics to surfaces belonging to different client connections.
Surfaces are exported via treeland_exported_surface_v1, receiving
a numeric surface_id that can be shared out-of-band. A remote
client attaches its own wl_surface as a sub-surface by passing the
parent's surface_id to create_remote_subsurface, obtaining a
treeland_remote_subsurface_v1 that mirrors the full wl_subsurface
API (set_position, place_above/below, set_sync/desync).
Standard wl_subcompositor sub-surfaces created under an exported
surface are automatically tracked by the compositor and reported
via child_entered / child_left, assigning them a subsurface_id
that participates in the same numeric namespace.
The primary motivation is Wine's winewayland.drv, where GPU-rendered
child windows belonging to a different Wine process cannot attach
their wl_surface as a sub-surface of the parent's surface today.
docs/cross-subsurface-design.md documents the background, design
rationale, compositor implementation notes, Wine integration plan,
and a comparison with xdg-foreign-v2.