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M2: Type 3 text in rendering mode 7 is not rendered and adds no clip (ISO 32000-2 9.3.6) (#4430)

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ISO 32000-2 9.3.6: for a Type 3 font, modes 3 and 7 shall not be
rendered, the other modes render the glyph descriptions, and modes
4 to 7 add nothing to the clipping path. Vendored hayro-interpret
patch 42 drew every mode but 3 filled, so 7 Tr painted the glyphs
in the fill colour (black by default) wherever a following fill
did not cover them.

Patch 64: show_glyph keeps mode 7 for Type 3 glyphs and reports
them as clipping text (GlyphDrawMode::Clip, painting nothing, kept
by extraction), and clip_glyph's Type 3 arm is a deliberate no-op.
Modes 0-2 and 4-6 still render filled.


Claude-Session: https://claude.ai/code/session_0175FWj4xFhMhSH3UpMU8DSC

Co-authored-by: Claude Opus 5.5 <noreply@anthropic.com>
Co-authored-by: Brandon Thomas <echelon@gmail.com>
This commit is contained in:
mtlcl410
2026-10-24 10:34:36 -04:00
committed by GitHub
co-authored by Claude Opus 5.5 Brandon Thomas
parent 9aef0dfb78
commit 6718f1f34e
7 changed files with 225 additions and 16 deletions
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parity/acrobat-features.toml
+1 -1
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@@ -783,7 +783,7 @@ status = "partial"
commands = []
tools = []
evidence = []
notes = "hayro bootstrap with vendored patches"
notes = "hayro bootstrap with vendored patches. Text rendering modes follow ISO 32000-2 §9.3.6 for Type 3 fonts: 3 and 7 render nothing, the others render the glyph descriptions filled (never stroked), and 4 to 7 add nothing to the clipping path (hayro-interpret patches 42 and 64). Coverage is synthetic fixtures; no fidelity comparison across a Type 3 corpus yet"
[[feature]]
id = "view.render-cid-fonts"