Crate entviz 

entviz — Rust reference port. The spec version it targets and emits is SPEC_VERSION.

This crate is a full, self-contained entviz implementation: the deterministic shared core (tokenization + quant extension, the SHA-512 fingerprint, ftok median/quartile selection, the Oklab color rules, grid selection), the format-specific parsers (entropy), and the SVG renderer (pipeline::render). It passes the shared conformance corpus at Tier A (render model) + Tier B (canonical raster) for every render vector, rejects every error vector, and satisfies every invariant pair. Certify with:

cargo build --release --bin entviz-conformance
# from the entviz repo:
PYTHONPATH=src:. python -m compliance.runner \
    --impl-cmd '/path/to/entviz-rs/target/release/entviz-conformance'

The entviz-conformance binary (src/main.rs) implements the stdin/stdout contract in the entviz repo’s compliance/README.md.

Modules

characterize

Entropy characterization model + label projection — port of src/entviz/characterize.py.

entropy

Format-specific entropy parsing (port of src/entviz/entropy.py).

keccak

Minimal pure-Rust Keccak-256 (the original Keccak, NOT NIST SHA3-256).

pipeline

Full render pipeline: entropy string → SVG string.

Structs

Alphabet

Grid

Token

VisualStyle

Constants

BASE64URL

HEX

MIDDLE_DOMAIN_TAG

Domain tag for the second, domain-separated digest. The trailing NUL is included. v6 is the construction version (fixed), NOT the spec version.

POSSIBLE_EDGE_COLORS

SPEC_VERSION

Functions

choose_grid

closest_palette_color

compute_fingerprint

median_token

nucleus_colors

Returns (bg_hex, fg_hex). Red is the low byte of the quant (CSS order).

oklab_lightness

quartile_tokens

second_digest

second = SHA-512(DOMAIN_TAG ‖ core). Computed for every input; drives the two color-bar markers on all inputs (and the middle cells on large ones). A legitimate part of the renderer — not adversarial tooling.

select_visual_style

tokenize

tokenize_fingerprint

weighted_rgb_distance