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swayfx-mosaic/tooling/probes/step20c-dynamic-output/README.md

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Dynamic output ownership source fixture

EXPERIMENTAL / preserved source-only fixture. Read the protocol and source audit. No production support or UX contract follows. Reconstruct in a full clone containing 8345aff0f97d381b768233021fc5c881ec794094 and copy this local fixture. Old temporary laboratories are not dependencies. No install or live IPC.

The preparer reuses pinned source-only fractional dependencies, builds private SceneFX/Mosaic and pristine SwayFX 0.6, then compiles the per-event logical-extent pointer and opaque SHM client with C17. Passive output traces preserve callback order and clip/render decisions. All artifacts stay in its printed LAB.

Run each mode once in the same campaign. Never delete/reset the ledger or create another lab to evade failed-action consumption. The runner reserves D1/D2/D3/D5 before IPC; camera pairs are zero. Each run owns private runtime, Wayland/IPC sockets and children, which its finally block removes.

sh tooling/probes/step20c-dynamic-output/prepare.sh
python tooling/probes/step20c-dynamic-output/test-budget.py
python tooling/probes/step20c-dynamic-output/run.py "$LAB" control
python tooling/probes/step20c-dynamic-output/run.py "$LAB" private_standard
python tooling/probes/step20c-dynamic-output/run.py "$LAB" private_mosaic
python tooling/probes/step20c-dynamic-output/analyze.py "$LAB"

Every IPC uses the private socket. Pointer coordinates derive from current get_outputs logical bounds per event. No physical scaling in injection. Failures remain scientific exclusions, not automatic clipping defects.

Observed campaign

The one measured campaign at /tmp/swayfx-mosaic-nested-grab-0zJrQnLj applied D1/D2/D3/D5 in all three modes: logical H1 width 800→960→800, workspace 6 and tiled 8 preserved, H1→H2→H1 ownership and applied clips reassociated. It retained 230 PNGs. Mosaic completed; both controls completed transitions but failed final calibration through temporary reference occlusion. Their generated sources remain in their run directories; the final fixture relocates both references before testing either. No failed dynamic action was replayed.

Result PARTIALLY_FEASIBLE. Stable vacated outputs are exact background; Mosaic owner hits and both-output calibration pass at all scored stages. Observed camera 640 remains within recalculated bounds; max-clamp is NOT TESTED. Mapped popup boxes fit inside the Mosaic viewport at that camera: exterior points are not proof of a clipped portion after migration. Opaque tiled spill without a negative clip control, effects (disabled), newly included point hits, intermediate frames, saved buffers and ABI/package remain unqualified.

Consumed budgets: six reconfigurations, six migrations, zero camera pairs. The ledger is exhausted for dynamic operations: do not run any mode again in this campaign. Only offline analysis/validation can be repeated. New campaign measurements require a separately authorized scope and budget.

scenario.py stores source text as a Python constant; run.py inserts it into the inherited bounded runner. Python AST checks cover the modules and all retained generated runners. Clients compile under C17 -Werror. New patch hashes:

  • pointer-dynamic-extents.patch: b07b1549f541cc55e1170737ea7aa4b869cd97f3411c1b103be1b96b21971eef
  • ownership-trace.patch: 4a4a48566bd5d5fe8edf6146548cbcf4f93500cc62421780b75cd1dcb82abcb6

The report distinguishes passive callback observation, settled capture and client delivery. Raw runs, source/evidence manifests and structured analyses remain outside Git. The original 529-entry evidence manifest and its expected SHA-256 were verified before an offline analyzer rerun replaced that temporary manifest with a 528-entry replay inventory. See the report's provenance note; the original manifest bytes are no longer present in the lab.

For an independent wlroots source audit, fetch the authoritative wlroots Git repository and inspect commit d783533489e1f75d6886c2ab5c5960090ef268f8 (tag 0.20.2). The campaign retains its complete source archive outside Git as wlroots-audited-source.tar; replay binaries link installed wlroots 0.20.2, without rebuilding or modifying that system library. pkg-config names are wlroots-0.20, scenefx-0.5 and wayland-client.