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Extreme Scripts Playground

Stress-test the pdfnative shaping pipeline against the most demanding inputs: deep BiDi mixing across 3+ scripts, Tamil ultra-conjuncts, Bengali & Devanagari with reph + multi-halant ligature chains, and isolated Arabic harakat. Pick a preset, edit the text, and click Generate PDF.

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Shaping & BiDi coverage:
  • Arabic harakat (تشكيل — fatha, kasra, damma, sukun, shadda…) now anchor on the preceding base glyph using font-provided GPOS MarkBasePos data, with fallback to (0, 0) when anchors are missing. Closes the visual half of #25.
  • UAX #9 isolates (LRI / RLI / FSI / PDI, U+2066–U+2069) handled via three-tier dispatcher with full recursion. Nested and unmatched isolates supported.
  • Shared GSUB / GPOS drivers — Bengali / Tamil / Devanagari / Arabic shapers route through a single ligature lookup and a single mark-base anchor helper.

UAX #9 explicit embeddings (LRE / RLE / LRO / RLO / PDF) with character-level X4–X5 direction overrides, and native COLRv1 colour emoji, are now shipped — try the embeddings & colour-emoji presets above.