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M2: a non-embedded CIDFont's fallback request carries its descendant's font descriptor (ISO 32000-2 §9.7.4, §9.8)

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Type0Font::new built its FallbackFontQuery from the Type 0 font
dictionary, which has no /FontDescriptor (ISO 32000-2 §9.7.6.1,
Table 119); the descriptor belongs to the descendant CIDFont (§9.7.4.1,
Table 115). Every request for a non-embedded CID font therefore said
not serif, not italic, weight 400, and no resolver could tell a Song or
Mincho font from a Hei or Gothic one, or see /FontWeight 700 (§9.8,
Tables 120, 121).

FallbackFontQuery::with_descriptor takes the name from the font
dictionary and the style from the given descriptor; new() calls it with
the dictionary's own descriptor, so simple fonts are unchanged. The CID
path passes the descendant's descriptor it already reads.

Vendored hayro-interpret patch (58). Tests in
crates/render/tests/it/cid_fallback_query.rs record the request a
font_resolver receives. The CID-fonts parity note now says the Japanese
face also follows the Serif flag and /FontWeight.

Co-Authored-By: Claude Opus 5.5 <noreply@anthropic.com>
Claude-Session: https://claude.ai/code/session_0175FWj4xFhMhSH3UpMU8DSC
This commit is contained in:
mtlcl410
2026-10-24 13:31:31 +08:00
co-authored by Claude Opus 5.5
parent 0b670caf4a
commit f2e222ebc5
6 changed files with 108 additions and 4 deletions
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parity/acrobat-features.toml
+1 -1
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@@ -783,7 +783,7 @@ status = "partial"
commands = []
tools = []
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", "crates/render/src/raster.rs::mincho_substitute_covers_half_width_katakana", "crates/render/src/text.rs::identity_to_unicode_names_give_text", "crates/fonts/src/pdf.rs::identity_to_unicode_names_read_codes_as_unicode"]
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; BIZ UDMincho for Mincho, which covers half-width katakana) when built with craft-fonts; non-embedded GB1, CNS1 and Korea1 fonts still draw nothing (no allowed face); a `/ToUnicode` given as the name `/Identity-H` or `/Identity-V` (WSCAD) reads codes as Unicode for selection, search and editing, without control characters"
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, else by the descendant font descriptor's Serif flag; bold Gothic for a Bold name or a `/FontWeight` of 600 or more; BIZ UDMincho for Mincho, which covers half-width katakana) when built with craft-fonts; non-embedded GB1, CNS1 and Korea1 fonts still draw nothing (no allowed face); a `/ToUnicode` given as the name `/Identity-H` or `/Identity-V` (WSCAD) reads codes as Unicode for selection, search and editing, without control characters"
[[feature]]
id = "view.render-image-codecs"