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Marco Arnulfo
80eff6775f
* fix(audit): a rectangle drawn as an m/l path is a cover like re (fixes #1510) * docs(parity): a rectangle drawn as an m/l path counts as a cover (#1510)
32 lines
1.4 KiB
Markdown
32 lines
1.4 KiB
Markdown
# pdfcraft-audit
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Layer L4 (may use `edit`): verification tooling, the faux-redaction audit.
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```rust
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let findings: Vec<Finding> = audit_redactions(&doc)?; // page, kind, rect, covered_text
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```
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It reports two kinds of finding:
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- **faux redaction**: an opaque filled rectangle painted *after* text it overlaps, dark enough
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against the text's colour (WCAG contrast below 3) to hide it, while the text is still
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extractable underneath;
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- **unapplied mark**: a Redact annotation that was marked but never applied.
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A properly applied redaction removes the text, so it never flags. Page backgrounds, table
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shading and highlights don't either: they're painted before the text, or light against it.
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Limits, by design and documented rather than hidden:
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- only filled rectangles count as covers, drawn with `re` or as a single `m`/`l` subpath whose
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corners form an axis-aligned rectangle (not other paths, shadings or patterns), and a
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translucent one (`/ca` below 1) is not flagged;
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- covers inside form XObjects are found, but only text drawn directly in the page content is
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checked under them;
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- annotation rectangles are compared in unrotated user space, so `/Rotate` pages may misalign.
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It fails closed: an undecodable content stream, malformed `/Annots`, form XObjects nested deeper
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than 32 or in a cycle, or a walk past the operator bound is an error, never "no findings".
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Surfaces: the `redact_audit` automation tool and `pdfcraft-cli`.
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