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Dylan M. Taylor
628a235ae5
* craft-cms: the changes PhotoCraft made to its copy since extraction PhotoCraft kept editing crates/cms after craft-cms was extracted from it at storytold/photocraft@b3222ee8. This ports its 41 commits up to storytold/photocraft@0143b148 with a three-way merge per file, keeping the changes craft-cms made on its own (Result-returning API, white preservation, FOGRA39, named colours, profile ID). Ported: the .3dl shaper, Mesh header, UTF-16 and .look fixes in lutfile; the checked ICC offsets and the per-profile curve sample budget; same_bytes and the byte-confirmed transform cache; the blocked matrix/TRC path and the 8-bit first-stage table; GpuMatrixShaper; cicp_rgb; the ACEScg and Dot Gain 20 % built-ins (the latter now the default gray); bisection for a table's flat ends; PhotoCraft spelled with a capital C in the built-in descriptions, with the shipped coated CMYK profile's bytes as PhotoCraft regenerated them. Not taken, because craft-cms already does it another way: Curve::inverse_table (inverse64_many), the effective-dimension loop in multilinear interpolation, the curve-count and mluc checks, and the .cube DOMAIN writer. The 8-bit first-stage table checks device white as the exact path does. Refs #779 * craft-cms: Lut3d::from_fn PhotoCraft's proof and HDR display tables are built from a chain of several transforms, which it wrote into Lut3d's fields. Those are private here, so from_fn samples any RGB function, with the same size bounds as from_transform. Refs #779 * craft-cms: README names Lut3d::from_fn
56 lines
1.8 KiB
Rust
56 lines
1.8 KiB
Rust
//! The header's profile ID (ICC.1:2022 §7.2.18).
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use craft_cms::{Builtin, CmsError, Profile, builtin, profile_id};
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fn hex(id: [u8; 16]) -> String {
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id.iter().map(|b| format!("{b:02x}")).collect()
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}
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#[test]
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fn the_id_matches_an_independent_md5() {
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// Computed outside Rust: MD5 of the shipped file with bytes 44–47, 64–67 and 84–99 zeroed.
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assert_eq!(hex(profile_id(builtin::COATED_CMYK_ICC).unwrap()), "ab1397490b9355815dea5668de6eb073");
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}
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#[test]
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fn encoded_profiles_carry_their_id() {
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for b in [Builtin::Srgb, Builtin::LabD50, Builtin::CoatedFogra39] {
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let p = b.profile().clone();
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let bytes = p.with_encoded_bytes().to_bytes();
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let id = profile_id(&bytes).unwrap();
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assert_ne!(id, [0; 16], "{b:?}");
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assert_eq!(bytes[84..100], id, "{b:?}");
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assert!(Profile::parse(&bytes).is_ok(), "{b:?}");
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}
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}
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#[test]
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fn flags_and_intent_are_left_out_but_tag_data_is_not() {
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let bytes = Builtin::Srgb.profile().to_bytes().to_vec();
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let id = profile_id(&bytes).unwrap();
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for at in [44, 47, 64, 67, 84, 99] {
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let mut b = bytes.clone();
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b[at] ^= 0x5a;
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assert_eq!(profile_id(&b).unwrap(), id, "byte {at} is excluded");
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}
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for at in [8, 100, 128, bytes.len() - 1] {
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let mut b = bytes.clone();
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b[at] ^= 0x5a;
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assert_ne!(profile_id(&b).unwrap(), id, "byte {at} is included");
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}
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}
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#[test]
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fn bytes_after_the_declared_size_are_not_hashed() {
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let bytes = Builtin::Srgb.profile().to_bytes().to_vec();
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let mut padded = bytes.clone();
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padded.extend([0xAB; 7]);
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assert_eq!(profile_id(&padded).unwrap(), profile_id(&bytes).unwrap());
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}
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#[test]
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fn a_short_profile_has_no_id() {
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assert_eq!(profile_id(&[0; 127]), Err(CmsError::Truncated));
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assert!(profile_id(&[0; 128]).is_ok());
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}
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