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LR-IMP-FORMATS: HEIC decodes like libheif; release builds include it

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heic-rs reconstructs iPhone HEVC tiles bit-exactly (checked against libde265), but
its colour stage was 2-27 code values off libheif on every iPhone photo: it ignores
the HEVC VUI and assumes BT.709 limited range. lightcraft-heif now converts YCbCr
itself (nclx, else VUI, else H.265 defaults; nearest chroma, bilinear for odd clap
offsets, as libheif), inherits tile ICC/nclx on grids, follows libheif's imir axis
and clap rounding, and outputs 16-bit RGB. Measured on 30 real and synthetic
files: within 1 code value of libheif (pillow-heif 1.8 / libheif 1.23).

Also: HEIF header reader for import (no pixel decode), embedded thumbnail for small
decodes, nclx/VUI colour hint (shared CICP mapping with PNG), clear 4:2:2/4:4:4
Unsupported error, Format::not_decodable as the one source of "why not" (import
reports "HEIC/HEIF support isn't included in this build"), `.heif` imports.
Release packaging and Nix build with the heif feature, as whats-new promised.
lightcraft_heif::testdata writes lossless (PCM) synthetic HEICs for the tests.

Co-Authored-By: Claude Opus 5.5 <[email protected]>
This commit is contained in:
Exalted5373andClaude Opus 5.5 committed 2026-10-09 14:38:00 -07:00
1 parent 88ea1a804b
commit 90361935ba
29 files changed
+2196 -143
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xtask/src/main.rs
+5 -1
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@@ -268,7 +268,11 @@ fn cmd_ci() -> Result<(), String> {
run(c, "cargo clippy -p lightcraft-codecs --features heif --all-targets -- -D warnings")?;
let mut c = cargo();
c.args(["test", "-p", "lightcraft-codecs", "-p", "lightcraft-heif", "--features", "lightcraft-codecs/heif"]);
run(c, "cargo test -p lightcraft-codecs -p lightcraft-heif --features lightcraft-codecs/heif")
run(c, "cargo test -p lightcraft-codecs -p lightcraft-heif --features lightcraft-codecs/heif")?;
// the engine's HEIC import test, with the decoder (the workspace run checks the error)
let mut c = cargo();
c.args(["test", "-p", "lightcraft-engine", "--lib", "--features", "lightcraft-codecs/heif", "heic"]);
run(c, "cargo test -p lightcraft-engine --lib --features lightcraft-codecs/heif heic")
}),
),
(