# Pixel-art item icon: the most machine-checkable style, and the one where
# "AI slop" is most detectable.
#
# CALIBRATION (measured, not guessed) over 250 genuine 32x32 CC0 icons from
# ~/data/opengameart-downloads:
#     p50=7  p75=10  p90=13  p95=14  p99=26  max=30
# Rejection rate of real hand-made art by cap:
#     cap 16 -> 3.6%   cap 24 -> 1.2%   cap 32 -> 0.0%
#
# A first attempt at 16 rejected a real DCSS rambutan icon (18 colours, clean
# binary alpha). That is the "the threshold was wrong, not the art" failure the
# seamless-tilesets skill documents, so the cap was re-derived from the corpus
# rather than nudged until one file passed. 32 admits all observed hand-made
# art while still rejecting un-quantized generator output by a wide margin
# (a raw diffusion sample measured 34403 colours before its finishing stage).
name = "pixel_icon"
canvas = [32, 32]
max_colors = 32
alpha_binary = true
min_margin = 1

# ALPHA_NOT_BINARY is listed first because ordering is load-bearing: a
# soft-alpha image has no fully-opaque pixels, so the colour gate would
# otherwise count zero and pass. See pixels.py module docstring.
# NO_OPAQUE_PIXELS is deliberately absent: it is a result code emitted by the
# colour/palette gates when they fail closed, not a gate you can request.
gates = [
  "ALPHA_NOT_BINARY",
  "TOO_MANY_COLORS",
  "CANVAS_SIZE",
  "SCALE_NOT_INVARIANT",
  "SILHOUETTE_LOW_CONTRAST",
  "MARGIN_TOO_SMALL",
]