FA-79765 / Barcode symbology encoding / Member archive

Narrow bars disappear after width reduction · case 05

At low resolutions single-module bars vanish, making the symbol unreadable.

Member previewVariant 5 · 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: minimum bar width 0	`[[0, 4], [10, 10]]`	`[[0, 4], [10, 11]]`	Failed

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