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pdfcraft/docs
432d3172d4 M7: draw new characters with the source font's own embedded program (#1760)
A PDF that embeds the complete TrueType/OpenType program of a simple
WinAnsi font can only encode 256 characters through that font, but the
program usually has many more glyphs. Typing one the encoding lacks
(ő, or Arabic in a face that has it) ignored the program: the edit went
to the Type 3 fallback, so official builds drew the character with the
Japanese face's Latin glyph, and builds without craft-fonts refused it
with "this text needs PdfCraft's Japanese fallback font", even for a
Latin letter.

The row editor now looks at the paragraph font's own program after the
source encoding, same-face resources and matching craft-fonts faces, and
before the fallback. When it has the glyph, the program is embedded once
per edit as a Unicode Type 0 font (the same embedding a loaded font
gets), so the new character keeps the source face. A paragraph whose new
characters only that program can draw takes the row editor's path.

The program is used only when:
- the font is not a subset (no `ABCDEF+` tag), since a subsetter can
  keep a character's mapping after dropping its outline;
- `validate` accepts it, which includes the OS/2 fsType check, so a font
  licensed for preview & print or restricted embedding is not reused for
  editable text.

When no face has a non-Japanese character, the error now names it and
points to Load font / Installed fonts; Japanese text keeps its message.

Tests: Inter embedded as a simple WinAnsi TrueType font, edited in a
one-row paragraph (the single-style path) and in a row of a two-row one,
draws ő from a Type 0 font whose program is Inter's bytes, with no Type
3 font and the word read back whole. The same program under a subset
name is not used, and without craft-fonts the edit fails, naming
"ő (U+0151)", and leaves the page unchanged. Both fail without this
change.

Co-authored-by: Claude Opus 5.5 <noreply@anthropic.com>
Co-authored-by: Brandon Thomas <echelon@gmail.com>
2026-10-15 02:23:47 -04:00
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