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v2.3.0 — forms authoring + search-grade text extraction

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@lxman lxman released this 04 Jul 15:40
v2.3.0
d9c25bf

Minor release: AcroForm field authoring on existing documents, text-extraction fixes that make search viable on real-world PDFs, and a field-tree-aware page import. Additive and back-compatible.

Added

  • Forms authoring API — create, remove, and reshape AcroForm fields on any loaded document via PdfDocumentEditor.Forms: AddTextField, AddCheckbox, AddRadioGroup (per-option widget placement via PdfRadioOptionPlacement), AddDropdown, AddSignatureField, and Remove(fullName) (field + widget removal with AcroForm pruning). The AcroForm dictionary is bootstrapped on documents that have no form, without setting /NeedAppearances — created fields carry real appearance streams.
  • Field mutations — PdfFormField.Rename (collision-validated) and SetWidgetRect (with appearance regeneration), plus settable IsReadOnly, IsRequired, FontName, FontSize (/Ff and /DA writes), text MaxLength / IsMultiline / Quadding, and choice Options (dropping stale selections).
  • TextFragment.Width — total advance width, so consumers can build highlight rects.

Fixed

  • Text extraction positions — fragments now track an advancing pen cursor (positions were previously reported at the line start for every fragment on kern-split lines) and carry a TextOffset into the assembled page text; XObject-hosted fragments rebase their offsets onto the outer text. Also corrected Y-flip compensation and Tz double-scaling in glyph placement.
  • Page import brings only the page's own fields. Importing a page from an XFA-style form (all fields under one root, e.g. the IRS W-2) used to drag the source's entire field forest — and orphan clones of its pages — into the target via widget /Parent → root → /Kids. The cloner now defers widget /Parent edges and rebuilds only the ancestor spine with /Kids filtered to the imported children; names, flags, values, and inheritance are preserved.
  • /Ff writes seed from effective inherited flags (a naive seed could silently drop inherited bits, degrading radio groups to checkboxes); the field-mutation surface is guarded against dynamic-XFA documents.

Performance

  • Type3 fonts: shared system font index, cached char-proc operations, lazy hot-path logging.
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