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tests/fixtures/pdf/fonts/README.md

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+# Unembedded Japanese CID fixture
+
+`unembedded-japanese.pdf` is authored locally by `../generate_fonts.py`, using
+ReportLab's predefined Japanese CID fonts. The two pages select
+`UniJIS-UCS2-H` and `UniJIS-UCS2-V` for HeiseiMin-W3 and HeiseiKakuGo-W5.
+No font program is embedded. The second page uses the PDF vertical writing
+mode, including native punctuation positioning, rather than individually
+positioning horizontal glyphs. The text is synthetic and contains no third-party
+document content. Font names identify requests; installed substitutes can differ.
+
+The manifest records the input hash, authored text and page dimensions.
+Generation requires ReportLab and pypdf. The generator checks both encoding
+names and absence of FontFile/FontFile2/FontFile3 in the CID font descriptors.
+Successful raster output alone does not establish character accuracy or full
+CMap coverage; compare with Poppler and inspect both pages.