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[PR #7149] Do not split runs on font scaling if the run is RTL #26851

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opened 2026-01-31 09:18:30 +00:00 by claunia · 0 comments
claunia commented 2026-01-31 09:18:30 +00:00
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Original Pull Request: https://github.com/microsoft/terminal/pull/7149

State: closed
Merged: No

Summary of the Pull Request

Right now if we have a glyph that needs scaling amidst some that don't, we split the GlyphRun and only apply scaling as necessary. This is generally fine, but it shouldn't be done in RTL since splitting the GlyphRun causes directionality issues.

References

#538

PR Checklist

  • Closes #xxx
  • CLA signed. If not, go over here and sign the CLA
  • Tests added/passed
  • Documentation updated. If checked, please file a pull request on our docs repo and link it here: #xxx
  • Schema updated.
  • I've discussed this with core contributors already. If not checked, I'm ready to accept this work might be rejected in favor of a different grand plan. Issue number where discussion took place: #xxx

Detailed Description of the Pull Request / Additional comments

In the process of working on this, I think I may have come up with the correct algorithmic idea for the Grand Fix for almost all RTL behavior: on the font fallback routine, if the run would be split by the index from the MapCharacters phase, try again and see if the fallback font can do the entire run. I have just been unable to create an object from the fallback font factory to run through the normal method with MapChars, so if you could point me in the right direction with DWrite that'd be great

Validation Steps Performed

Cat-ing. Generally speaking this means that RTL words will be intact though in reverse order when cat-ed, instead of just garbled arbitrarily.

**Original Pull Request:** https://github.com/microsoft/terminal/pull/7149 **State:** closed **Merged:** No --- <!-- Enter a brief description/summary of your PR here. What does it fix/what does it change/how was it tested (even manually, if necessary)? --> ## Summary of the Pull Request Right now if we have a glyph that needs scaling amidst some that don't, we split the GlyphRun and only apply scaling as necessary. This is generally fine, but it shouldn't be done in RTL since splitting the GlyphRun causes directionality issues. <!-- Other than the issue solved, is this relevant to any other issues/existing PRs? --> ## References #538 <!-- Please review the items on the PR checklist before submitting--> ## PR Checklist * [ ] Closes #xxx * [x] CLA signed. If not, go over [here](https://cla.opensource.microsoft.com/microsoft/Terminal) and sign the CLA * [ ] Tests added/passed * [ ] Documentation updated. If checked, please file a pull request on [our docs repo](https://github.com/MicrosoftDocs/terminal) and link it here: #xxx * [ ] Schema updated. * [ ] I've discussed this with core contributors already. If not checked, I'm ready to accept this work might be rejected in favor of a different grand plan. Issue number where discussion took place: #xxx <!-- Provide a more detailed description of the PR, other things fixed or any additional comments/features here --> ## Detailed Description of the Pull Request / Additional comments In the process of working on this, I think I may have come up with the correct algorithmic idea for the Grand Fix for almost all RTL behavior: on the font fallback routine, if the run would be split by the index from the MapCharacters phase, try again and see if the fallback font can do the entire run. I have just been unable to create an object from the fallback font factory to run through the normal method with MapChars, so if you could point me in the right direction with DWrite that'd be great <!-- Describe how you validated the behavior. Add automated tests wherever possible, but list manual validation steps taken as well --> ## Validation Steps Performed Cat-ing. Generally speaking this means that RTL words will be intact though in reverse order when cat-ed, instead of just garbled arbitrarily.
claunia added the pull-request label 2026-01-31 09:18:30 +00:00
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Reference: starred/terminal#26851
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