Font rendering with vertical text
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- Dominant language
- Rust
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Description
I appreciate that resvg supports vertical writing-mode. When testing with Japanese vertical text, I noticed some characters are rotated incorrectly.
The issue appears to affect specific characters like 'yoon', 'sokuon' in vertical writing mode.
https://en.wikipedia.org/wiki/Y%C5%8Don
https://en.wikipedia.org/wiki/Sokuon
As shown in the attached image:
- Left: SVG rendered correctly in browser
- Right: svg2png-wasm output using resvg (incorrect rotation)
Contributor guide
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First steps
- Read the whole issue, then the project's contributing guide.
- Comment on the issue to say you are picking it up — it saves two people doing the same work.
- Fork the repository and make your change on a branch.
- Open a pull request that references the issue number.
Research direction
Start by reproducing the Japanese vertical-writing example through resvg's svg2png-wasm output and comparing it with the browser rendering shown in the issue. Trace the vertical writing-mode font-orientation handling for yoon and sokuon characters; the work is done when those characters receive the correct rotation.
Written by the indexing model from the issue text.
Assessment
- Tech stack
- rust, wasm
- Domain
- computer-graphics, internationalization
- Issue type
- Bug
- Difficulty
- 4/5
- Estimated time
- 3-5 days
- Activity status
- Stale
- Clarity
- Mostly clear
- Newbie friendliness
- 35/100