PDF import and export: keep invisible text (rendering mode 3) as type (#2675)

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Text drawn in rendering mode 3 (3 Tr), which is how a scanned page carries
its recognized OCR text, was left out on open (since #2988, with a warning),
so a scanned PDF opened and saved again lost its searchable text.

Import: an invisible glyph now comes in as type with neither fill nor
stroke. It skips the glyph-outline checks that guard how visible type looks,
and it joins only other invisible text on a line (Look::takes no longer
lets it into a stroke-only run). INVISIBLE_TEXT_NOTE now only reports text
that can't be type (text opened as outlines, Type 3 fonts), and
tests_reader_compat::invisible_text_is_reported_when_left_out expects the
invisible line as unpainted type when text opens as type.

Export and print: characters with no fill and no stroke are written as real
text inside a form marked Mark::Invisible; forms::finish sets that form's
text rendering mode to 3, so it draws nothing but stays selectable and
searchable (PDF/X-1a and PDF/A-2b too). The writer has no invisible mode of
its own, so this reuses the marked-form mechanism used for layers and
overprint.

Co-Authored-By: Claude Opus 5.5 <noreply@anthropic.com>

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This commit is contained in:

Brian Torres

2026-10-20 04:43:11 +07:00

committed by bflatastic

co-authored by Claude Opus 5.5

parent 498d17f72e

commit ac7f0eebf8

11 changed files with 251 additions and 44 deletions

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docs/file-format-parity.md

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docs/target-app-parity.md

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