[PDFBOX-4468] Incorrect tiling pattern rendering when step smaller than bbox

• Type: Bug
• Status: Open
• Priority: Major
• Resolution: Unresolved
• Affects Version/s: 2.0.13
• Component/s: Rendering
• Labels: Pattern
• External issue URL: https://github.com/mozilla/pdf.js/pull/6606
• Assignee: Unassigned
• Reporter: Tilman Hausherr
• Created: 19/Feb/19 18:46
• Updated: 19/Feb/19 19:31

Description

From a remark by Rob Wu in a PDF.js project PR, I noticed that we're not doing tiling patterns correctly when the XStep or YStep is smaller than bounding box width / height. We're doing exactly what he told not to do.

Base pattern:
\/

Expected rendering of repeated pattern (recall xstep = half of width):
\XXXX

Actual rendering if truncating pattern width to xstep:
\\\\\