[hsmith-dev]

What this changes

Fixes the dash-pattern part of #5561. Three things were wrong in crates/xfa:

• parse.rs folded dashDot and dashDotDot into Stroke::Dashed.
• pdf.rs and pdf/common.rs wrote one [2 2] 0 d for every stroke that isn't solid.
• layout/draw.rs dashed a <line> only for Stroke::Dashed, so a dotted line drew solid.

What changes:

• Stroke gains DashDot and DashDotDot.
• Item::Line and Rounded::edge carry the edge's Stroke in place of a dashed: bool.
• A single pdf::common::dash writes each stroke's pattern, in multiples of the edge width, with projecting caps (2 J). Square edges, rounded edges and lines all use it.
• A new pdf::common::line writes a line item. It takes over from the inline format!, so the output can be tested.

At 3pt the patterns are exactly what Acrobat flattens the issue's line.pdf to, per KenM76's triage on the issue: [12 6], [3 6], [9 6 3 6] and [9 6 3 6 3 6]. Solid and 3-D (relief) strokes stay solid.

This PR leaves out rotate (also in #5561), zero-size lines (#4588) and corners (#4675).

How you verified it

• cargo fmt --check -p pdfcraft-xfa
• cargo clippy -p pdfcraft-xfa --all-targets -- -D warnings
• cargo test -p pdfcraft-xfa: 131 passed
• cargo xtask parity --partial passes. No crate boundaries or assets changed.

Tests. There are two new tests in crates/xfa/src/tests.rs:

• edge_strokes_keep_their_own_dash_patterns lays out a template with a <line> and a bordered draw for each of solid, dashed, dotted, dashDot, dashDotDot and lowered. It checks that each item keeps its stroke and that each line's content has the right d/J operators, or no dash at all.
• dash_patterns_scale_with_width_and_stay_valid covers width scaling and a dashed rounded edge. It also checks that a tiny width and a NaN width still give a pattern with no zero lengths.

I reverted each part of the fix separately and watched the tests fail every time: the parse folding, dotted <line>s drawing solid, and the fixed [2 2] pattern.

Never-crash

• No new unwrap/expect/panic!/unreachable!/todo! outside tests
• No input-derived indexing. The dash width is guarded: a non-finite width counts as 1pt, and anything under 0.01pt counts as 0.01pt, so no dash rounds to 0.
• No unsafe

Provenance

• No assets, fonts or copied code
• The patterns come from black-box observation of the flattened page content in the issue's attachment, as reported on the issue. They don't come from any other implementation.

Security

• No change to path handling, MCP, the control channel or networking

Parity and reach

• I updated the XFA layout note in parity/acrobat-features.toml. It says the patterns were measured on 3pt edges only, and adds a draw's rotate to what's missing.

Anything a reviewer should look at first

• Scaling with width is assumed, not observed. The issue's file only has 3pt edges. At that width the arrays are exact multiples of the width (4:2, 1:2, 3:2:1:2), which suggests they scale, but a form with a 1pt dashed edge in Acrobat would settle it.
• 2 J is applied to dashed strokes only. Solid edges keep butt caps, so solid output is byte-for-byte unchanged.
• M12: an XFA corner is a right angle unless its join is round, and is drawn with its own line #4675 touches the same pen code. Whichever PR lands second needs a small rebase: its Pen { dashed } becomes Pen { stroke }, and p.dashed's [2 2] becomes dash(p.stroke, p.width). I'm happy to rebase this one onto it.

🤖 Generated with Claude Code

Summary by CodeRabbit

• Bug Fixes
  • XFA lines and borders now retain their selected stroke styles, including dash-dot and dash-dot-dot patterns.
  • Dash patterns now scale with stroke width; solid and relief strokes remain undashed.
  • Dashed lines use adjusted endpoints and caps according to line length and width, including for short lines.

[coderabbitai]

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Reviewing files that changed from the base of the PR and between 2dcb1f4 and d4edc66.

Files selected for processing: 1

• crates/xfa/src/tests.rs

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Walkthrough

The change preserves XFA stroke styles from parsing through layout and PDF rendering. It adds dash-dot stroke variants and pattern generation. The parity notes also remove three listed limitations.

Changes: XFA stroke rendering

Layer / File(s)	Summary
Stroke variants and layout item contract crates/xfa/src/model.rs, crates/xfa/src/parse.rs, crates/xfa/src/layout/items.rs	Stroke gains DashDot and DashDotDot. Edge parsing retains these variants. Line and rounded-edge items store the full Stroke value.
Stroke propagation through layout crates/xfa/src/layout/common.rs, crates/xfa/src/layout/draw.rs, crates/xfa/src/layout/pages.rs	Layout carries stroke values through line splitting, drawn lines, border edges, and solid underlines.
PDF dash patterns and rendering tests crates/xfa/src/pdf/common.rs, crates/xfa/src/pdf.rs, crates/xfa/src/tests.rs	PDF helpers emit patterns for stroke styles, with dash lengths scaled by width. Tests cover line and border styles, scaling, and narrow or non-finite widths.

XFA feature parity notes

Layer / File(s)	Summary
Dynamic XFA parity notes parity/acrobat-features.toml	The notes remove draw rotation, print-relevant page areas, and page breaks before the first section from the listed missing behaviors. The change does not show implementation updates for these behaviors.

Estimated code review effort: 3 (Moderate) | ~20 minutes

Change: Bug fix

Sequence Diagram(s)

sequenceDiagram
  participant EdgeParser
  participant Layout
  participant PDFRenderer
  EdgeParser->>Layout: parsed Stroke value
  Layout->>PDFRenderer: line and border items with Stroke
  PDFRenderer->>PDFRenderer: generate stroke-specific dash output

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Possibly related issues

• Issue 5561: The change preserves edge stroke styles and emits stroke-specific dash operators. Rotation remains out of scope.
• Issue 4409: The change covers tiny and non-finite widths. Zero-size lines remain out of scope, and the vendored renderer fix is not included.
• Issue 5558: The change updates square and rounded-edge stroke output. Corner behavior remains out of scope.

Suggested reviewers: aiongg, erickaden

Merge Risk: Minimal · up to d4edc

No actionable merge-blocking risk was established for the stroke-rendering change.

Architecture risk: Low · up to d4edc

The change affects 2 systems.

Changed systems: crates, parity

Architecture concerns
No architecture-level concerns identified.

Review details

Systems and components

• observed — crates (service) was modified; 9 changed files map to changed impact.
• observed — parity (service) was modified; 1 changed file maps to changed impact.

Before / after behavior

• observed — Modified behavior in crates/xfa/src/layout/common.rs: divide now preserves stroke when returning an unsplit line or splitting a line at the cut; the previous branch preserved dashed instead. The endpoint ordering, cut comparisons, and interpolation remain unchanged.
• observed — Modified behavior in crates/xfa/src/layout/draw.rs: Rounded-border edges now retain and pass their Stroke value instead of converting dashed and dotted strokes to true and other strokes to false.
• observed — Modified behavior in crates/xfa/src/layout/draw.rs: Straight border edges now pass their Stroke value to Item::Line; the previous dashed flag represented only whether the stroke was dashed or dotted.
• observed — Modified behavior in crates/xfa/src/layout/draw.rs: Drawn lines now pass their Stroke value to Item::Line instead of setting a boolean that was true only for dashed strokes.

Pre-merge checks: 4 · 1

Failed checks: 1 warning

Check name	Status	Explanation	Resolution
Docstring Coverage		Docstring coverage is 72.73% which is insufficient. The required threshold is 80.00%. Docstring coverage is scoped to functions touched by this diff with cyclomatic complexity of at least 2. Documenta…	Write docstrings for the functions missing them to satisfy the coverage threshold.

Passed checks: 4 passed

Check name	Status	Explanation
Title check		The title clearly identifies the main change: preserving distinct dash patterns for XFA edges.
Description check		The description follows the required template. It explains the changes, verification steps, tests, safety checks, provenance, security, parity updates, known limitations, and reviewer focus areas.
Linked Issues check		Check skipped because no linked issues were found for this pull request.
Out of Scope Changes check		Check skipped because no linked issues were found for this pull request.

Full details: Docstring Coverage

Explanation

Docstring coverage is 72.73% which is insufficient. The required threshold is 80.00%. Docstring coverage is scoped to functions touched by this diff with cyclomatic complexity of at least 2. Documentation-only edits and deletions within surviving functions are included; unchanged diff context and fully deleted functions are excluded. Analyzed 11 functions across 9 files.

Resolution

Write docstrings for the functions missing them to satisfy the coverage threshold.

Finishing Touches

Generate unit tests (beta)

• Create a new PR

• Autofix · Keep fixing CodeRabbit findings and required CI, and resolving merge conflicts

[coderabbitai]

Actionable comments posted: 1

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• Fix comments: Fix CodeRabbit comments on this PR

Prompt to fix review comments

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only still-valid issues, skip the rest with a brief reason, keep changes
minimal, and validate.

Inline comments:
Review comments at @crates/xfa/src/pdf/common.rs:
- Line 166: Update draw_border so square border segments with projecting caps
are inset by half the stroke width at their endpoints, keeping the painted
stroke within the box bounds; preserve existing geometry for strokes without
projecting caps.

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Commits

Reviewing files that changed from the base of the PR and between eea00a6 and 7f8ee6e.

Files selected for processing: 10

• crates/xfa/src/layout/common.rs
• crates/xfa/src/layout/draw.rs
• crates/xfa/src/layout/items.rs
• crates/xfa/src/layout/pages.rs
• crates/xfa/src/model.rs
• crates/xfa/src/parse.rs
• crates/xfa/src/pdf.rs
• crates/xfa/src/pdf/common.rs
• crates/xfa/src/tests.rs
• parity/acrobat-features.toml

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[FredApps]

ReviewerA — source-read COMMENT (not an approval)

I read the first hunks: layout items of kind Line carry a stroke instead of a dashed flag, so XFA edges keep their own dash patterns (dotted, dashed, dash-dot, long dashes) rather than all being drawn as one dashed style (#5561); divide copies the stroke into both halves when a line is cut at a page break. Carrying the full stroke through is the right model; the split must keep the dash phase continuous across the break, or the pattern restarts visibly at the cut. I did not read the rest. Add tests for each XFA stroke kind (solid, dashed, dotted, dashDot, dashDotDot, lowered, raised, embossed, etched as far as supported), and a line cut by a page break. Nothing was run.

I ran nothing and have no exact-head CI result for this PR, so this is not an approval. Where a diff was long I read its code hunks rather than every generated or documentation line.

Status: waiting_author.

[hsmith-dev]

Thanks for reading through this. Here's what changed for each point.

Tests for each stroke kind. Added in d4edc66. edge_strokes_keep_their_own_dash_patterns now covers all nine XFA stroke values, on a <line> and on all four sides of a border, at 3pt:

• solid: solid
• dashed: [12 6]
• dotted: [3 6]
• dashDot: [9 6 3 6]
• dashDotDot: [9 6 3 6 3 6]
• lowered, raised, embossed, etched: solid (they share Stroke::Relief, drawn as a solid grey line)

dash_patterns_scale_with_width_and_stay_valid covers other widths, rounded boxes, and degenerate or NaN widths.

A line cut by a page break. New a_dashed_border_cut_by_a_page_break_stays_dashed_on_each_page. It cuts a 12-inch dashed box at a page break and checks three things:

• every edge on both pages keeps Stroke::Dashed and writes [8 4] 0 d 2 J
• the two halves of the left edge add up to the whole side
• the test fails when divide drops the stroke from the lower half (checked by reverting)

Dash phase across the break. Not changed, on purpose. The two halves are drawn on different pages, so the pattern restarting at the top of the second page can't be seen as a seam. Neither the XFA spec nor our black-box notes say whether Acrobat carries the phase over. If someone observes that it does, keeping the phase means divide stores an offset on the lower half, which is a small follow-up.