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LR-HDR-EXPORT: HLG HDR AVIF export (hdrTransfer) and a tested SDR/HDR display decision

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AVIF HDR export takes hdrTransfer = pq | hlg (export dialog: HDR curve;
MCP export schema lists it). HLG writes CICP transfer 18 and no clli box.
The window logs whether it shows HDR; today always SDR (eframe configures
an 8-bit surface), with the platform / surface format / headroom / opt-out
rules unit-tested. Also satisfies clippy 1.99's chunks_exact_to_as_chunks
in spots.rs.

Part of #868.

Sources: ITU-R BT.2100 (HLG OETF, inverse OOTF with system gamma 1.2),
ITU-R BT.2408 (203 cd/m2 reference white at 75 % HLG); own design for
the display decision.

Co-Authored-By: Claude Opus 5.5 (1M context) <noreply@anthropic.com>
This commit is contained in:
Andrew Frahn
2026-10-12 03:02:02 +11:00
co-authored by Claude Opus 5.5
parent 76b5377868
commit 0a6f8d3db8
12 changed files with 331 additions and 22 deletions
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crates/engine/src/tests_export.rs
+15
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@@ -455,6 +455,21 @@ fn hdr_avif_export_is_pq_rec2020() {
assert!(nclx(&sdr.bytes).is_none_or(|c| c[3] != 16));
}
#[test]
fn hdr_avif_export_hlg() {
let mut s = Session::with_demo();
let id = sunset(&mut s);
let o = ExportOptions::from_json(&json!({"longEdge": 160, "format": "avif", "hdr": true, "hdrTransfer": "hlg", "quality": 70}));
assert_eq!(o.hdr_transfer, crate::export::HdrCurve::Hlg);
assert_eq!(o.to_json()["hdrTransfer"], "hlg");
s.execute("develop.hdr", &json!({"enabled": true, "maxEv": 2})).unwrap();
let hdr = export_photo(&mut s, id, &o, 1).unwrap();
// nclx: BT.2020 primaries (9), HLG (18), BT.2020 NCL (9), full range; no content light level box
let i = hdr.bytes.windows(4).position(|w| w == b"nclx").expect("colr nclx box");
assert_eq!(hdr.bytes[i + 4..i + 11].to_vec(), vec![0, 9, 0, 18, 0, 9, 0x80]);
assert!(!hdr.bytes.windows(4).any(|w| w == b"clli"));
}
/// "Remove location info" holds for the file-copying formats too: the sidecar and the DNG's
/// packet carry no location, and an original that embeds GPS is refused rather than copied.
#[test]