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Krzysztof kuhy Rudnicki
da8ca6d827
Adds the route-independent spine of the planned art-generation bake-off: a harness that decides whether generated art is well-formed, so "non-sloppy" becomes machine-checkable instead of a judgement call. Findings that shaped the design, all measured rather than assumed: - Integer-scale invariance separates true pixel art (impurity 0.0000) from interpolated fakes (1.0000) exactly -- but passes trivially at scale 1, so it must never be trusted alone on native-resolution output. - Gate ORDER is load-bearing. A soft-alpha image has no fully-opaque pixels, so an opaque-only colour count returns 0 and silently passes. ALPHA_NOT_BINARY now runs first and COLOR_COUNT fails closed on an empty opaque set. - Counting must be over opaque RGB only: transparent pixels retain arbitrary RGB and inflated a naive RGBA count, rejecting correct art at 18/16. - Declaring a gate was not enough to run it. hand_painted.toml shipped declaring SILHOUETTE_LOW_CONTRAST with no implementation, so it parsed, ran nothing, and reported a pass. load_spec now fails closed on unimplemented gates, result-only codes, and gates missing their config. Thresholds are calibrated against 250 genuine 32x32 CC0 icons, not guessed: p50=7 p90=13 p99=26 opaque colours; cap 32 rejects 0.0% of real art while raw generator output measured 34403 colours. An initial cap of 16 wrongly rejected a real DCSS icon -- re-derived from the corpus rather than nudged. Verified: 57 tests, 100% branch coverage, zero suppressions, all hooks pass. 58/60 (96.7%) of real CC0 icons pass the full stack; both failures confirmed true positives. Co-Authored-By: Claude Opus 5 (1M context) <noreply@anthropic.com> Claude-Session: https://claude.ai/code/session_01T9rQ12yZ7sJxiPQTCS5dUF
22 lines
2.8 KiB
JSON
22 lines
2.8 KiB
JSON
{
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"title": "artgate: deterministic exit-code gates for generated game art",
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"objective": "Make 'non-sloppy' a machine-checkable property of a generated art asset rather than a judgement call, by shipping a route-independent gate harness that takes an image plus a per-style spec and returns an exit code with machine-readable reason codes. This is the spine of a planned 4-route x 4-style generation bake-off: every route feeds the same harness, so the comparison yields a decision table instead of four incomparable portfolios. Adjudication is by exit code only - no model ever grades another model's art.",
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"acceptance_criteria": [
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"A CLI gates one image against one TOML spec and returns 0 (pass), 1 (gate failure) or 2 (harness/spec error); a malformed spec is never reported as an art verdict.",
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"Gates implemented: ALPHA_NOT_BINARY, TOO_MANY_COLORS, OFF_PALETTE, CANVAS_SIZE, SCALE_NOT_INVARIANT, SILHOUETTE_LOW_CONTRAST, with NO_OPAQUE_PIXELS and EMPTY_CANVAS as fail-closed result codes.",
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"Gate applicability is declared per style as data, so gates meaningless for a style (palette/colour/scale for hand-painted) are absent rather than manufacturing false failures.",
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"Fail closed on spec faults: a gate that is declared but unimplemented, declared without its required config, or is a result-only code, raises at load time instead of silently not running.",
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"Every numeric threshold is derived from calibration controls or a real-art corpus, never guessed.",
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"Real hand-made CC0 art passes the full stack at a high rate; any failure is verifiable as a true positive.",
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"100% branch coverage, zero lint suppressions, all pre-commit hooks pass."
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],
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"out_of_scope": [
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"Generating any art. No route drivers, no diffusion code, no ComfyUI, no Blender - this change adds only the adjudicator.",
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"Gates for tiling and animation (SEAM_ENERGY, LOOP_POPS, FRAME_DISTINCT). The maths exists in the seamless-tilesets and pixel-animation skills and will be lifted, not reinvented, when those cells run.",
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"Licence gating (LICENSE_FLAG). Reserved for the sourced-CC0 route.",
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"Committing any generated image. Binaries stay outside the repo by design; only the code lives here.",
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"The human contact-sheet gate, which decides 'good' - the machine gates only establish 'not malformed'."
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],
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"verifier": "python -m pytest python_pkg/artgate/tests/ --cov=python_pkg.artgate --cov-branch --cov-fail-under=100 (57 tests, 100% branch); pre-commit run --files python_pkg/artgate/*.py python_pkg/artgate/tests/*.py (ruff select=ALL, mypy strict, pylint, bandit, codespell, no-noqa); plus an end-to-end batch over 60 genuine 32x32 CC0 icons from ~/opengameart-downloads, requiring a high pass rate with every failure confirmed a true positive (58/60 = 96.7% measured)."
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}
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