Use CID font (Identity-H encoding) for full Unicode support #181
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Pull request overview
This PR implements full Unicode support for PDF text rendering by switching from simple font encoding to CID fonts with Identity-H encoding. The change enables proper rendering of international characters including Latin accents, Greek, Cyrillic, and special characters that were previously unsupported.
Key changes:
- Replaced simple font encoding (Latin/Greek/Cyrillic) with CID font encoding for universal Unicode support
- Added comprehensive test coverage for various Unicode character sets and special characters
- Introduced three new PDF validation functions to check password requirements, edit restrictions, and DocMDP P1 certification status
Reviewed changes
Copilot reviewed 4 out of 4 changed files in this pull request and generated 3 comments.
| File | Description |
|---|---|
| pdf_handler.c | Implemented CID font encoding with hex string conversion for Unicode text, added PDF validation functions (password, restrictions, DocMDP) |
| pdf_handler.go | Added wrapper functions for new PDF validation checks, standardized duration metrics calculation |
| pdf_handler.h | Declared new C function signatures and output structures for PDF validation |
| pdf_handler_font_test.go | Added comprehensive Unicode test suite covering 20 test cases for various character sets |
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PaNaVTEC
approved these changes
Dec 22, 2025
rlasskiy
added a commit
to Nitro/lazyraster
that referenced
this pull request
Dec 22, 2025
Full Unicode support for PDF text rendering by switching from simple font encoding to CID fonts with Identity-H encoding.
The change enables proper rendering of international characters including Latin accents, Greek, Cyrillic, and special characters that were previously unsupported
Key changes
- `go get github.com/nitro/lazypdf/v2@latest`
- Nitro/lazypdf#181
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Full Unicode support for PDF text rendering by switching from simple font encoding to CID fonts with Identity-H encoding.
The change enables proper rendering of international characters including Latin accents, Greek, Cyrillic, and special characters that were previously unsupported
Key changes: