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M2.6: non-embedded Japanese CID fonts draw in a craft-fonts face (#368)

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#260 (page 2): text in a Japanese CID font that the PDF doesn't embed
(HeiseiMin-W3 with UniJIS-UCS2-H, Adobe-Japan1) drew nothing, while
MuPDF, Poppler, PDFium and Acrobat draw it in a Mincho face. hayro asks
its font resolver for a substitute with the CID collection in the
query, but the renderer never installed one, so hayro's default
answered with a Latin standard-14 font that has no Japanese glyphs.
Release builds have embedded Japanese faces from craft-fonts all along;
the renderer just didn't use them.

RenderConfig::settings now installs a resolver: for an Adobe-Japan1
fallback query it returns a craft-fonts face (Shippori Mincho for
Mincho names, BIZ UDPGothic Regular or Bold for Gothic names, the
descriptor's serif flag otherwise); every other query keeps hayro's
default. hayro already maps such fonts through the Adobe-Japan1-UCS2
CMap to Unicode and the face's cmap. Without craft-fonts nothing
changes. Other CJK collections are untouched: the pinned craft-fonts
has only Japanese faces, and its later Chinese face is Noto CJK, which
AGENTS.md §1.1 rules out. pdfcraft-render now depends on pdfcraft-fonts
(L3 to L2).

Tests: raster::tests::non_embedded_japanese_cid_fonts_draw_with_a_craft_fonts_face
(with CRAFT_FONTS_DIR: 日本 in HeiseiMin-W3 and HeiseiKakuGo-W5 now
draws; it drew 0 dark pixels before; skips without craft-fonts, as the
Linux CI job has them) and raster::tests::japanese_font_names_pick_mincho_or_gothic.
The parity entry view.render-cid-fonts cites the test and notes what is
still missing.

Co-authored-by: Claude Opus 5.5 <noreply@anthropic.com>
Co-authored-by: Brandon Thomas <echelon@gmail.com>
This commit is contained in:
cyfung1031
2026-10-08 19:39:26 -04:00
committed by GitHub
co-authored by Claude Opus 5.5 Brandon Thomas
parent 4995da0653
commit 3b8a274f52
4 changed files with 114 additions and 3 deletions
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parity/acrobat-features.toml
+2 -2
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@@ -746,8 +746,8 @@ milestone = "M2"
status = "partial"
commands = []
tools = []
evidence = ["crates/render/src/raster.rs::huge_cid_width_ranges_terminate"]
notes = "CID-to-Unicode tables are M2.4"
evidence = ["crates/render/src/raster.rs::huge_cid_width_ranges_terminate", "crates/render/src/raster.rs::non_embedded_japanese_cid_fonts_draw_with_a_craft_fonts_face"]
notes = "CID-to-Unicode tables are M2.4; a non-embedded Adobe-Japan1 font is drawn in a craft-fonts Japanese face (Mincho or Gothic by name) when built with craft-fonts; non-embedded GB1, CNS1 and Korea1 fonts still draw nothing (no allowed face)"
[[feature]]
id = "view.render-image-codecs"