FA-79754 / Barcode symbology encoding / Member archive

Wide bars are drawn as separate one-module bars · case 04

With bar width reduction every wide bar shows hairline gaps between its modules.

Member previewVariant 4 · 3 implementations · 8 checks per implementation

Case contract

Render a module string ("1" bar, "0" space) at xn/xd device pixels per module after `quiet` leading quiet-zone modules. Module boundary k lies at round-half-up((quiet + k) * X), computed from the exact fraction so errors do not accumulate. Adjacent bar modules merge into one bar [start, end); bar width reduction shaves `bwr` pixels from the right edge of each bar, but a bar is never narrower than 1 pixel.

Why this case matters

Retail, logistics, pharmacy and document workflows depend on encoders that produce exactly the module pattern, code-set switches, separators and quiet zones scanners expect; one misplaced module or separator makes a label unreadable or, worse, scan as different data.

One recorded failure

Sample boundary fixture

This sample comes from the broken implementation of a controlled reproducer.

Boundary fixture	Actual	Expected	Outcome
regression: adjacent bar merging 0	`[[2, 4], [4, 6]]`	`[[2, 6]]`	Failed

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