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M2.6: the widest image that can be averaged is decoded

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The exclusion's test only looked past the limit, so a mutant moving it by one survived.

Co-Authored-By: Claude Opus 5.5 <noreply@anthropic.com>
Claude-Session: https://claude.ai/code/session_01AmsdeUCdTaD72jkDw2pJKY
This commit is contained in:
Grzegorz Martens
2026-10-31 17:43:46 +01:00
co-authored by Claude Opus 5.5
parent 199354246b
commit a6944cbbdf
1 changed files with 4 additions and 2 deletions
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crates/optimize/src/images.rs
+4 -2
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@@ -1425,8 +1425,10 @@ mod dimension_tests {
let plain = image(&|_| {});
assert!(spent(&plain, false) > 0, "one that can be averaged is decoded");
assert_eq!(spent(&plain, true), 0, "drawn where a device colour space is remapped");
let wide = image(&|d| d.set(b"Width".to_vec(), Object::Int(i64::from(pdfcraft_filters::MAX_CCITT_COLUMNS) + 1)));
assert_eq!(spent(&wide, false), 0, "too wide to average");
let width = |w: i64| image(&move |d| d.set(b"Width".to_vec(), Object::Int(w)));
let widest = i64::from(pdfcraft_filters::MAX_CCITT_COLUMNS);
assert!(spent(&width(widest), false) > 0, "the widest that can be averaged is decoded");
assert_eq!(spent(&width(widest + 1), false), 0, "too wide to average");
let tinted = image(&|d| d.set(b"ColorSpace".to_vec(), Object::Array(vec![Object::name("CalGray"), Object::Dict(Dict::new())])));
assert_eq!(spent(&tinted, false), 0, "no way to tell which sample is dark");
}