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[PR #10580] #10477: Handle things above U+FFFF in GDI renderer #28119

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opened 2026-01-31 09:26:28 +00:00 by claunia · 0 comments
claunia commented 2026-01-31 09:26:28 +00:00
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Original Pull Request: https://github.com/microsoft/terminal/pull/10580

State: closed
Merged: Yes

Implementation of #10477 - handle surrogate pairs in GDI renderer.

PR Checklist

Detailed Description of the Pull Request / Additional comments

Why not let Windows draw surrogate pairs? It can do that.

Basically, the comment says everything:
c90de69250/src/renderer/gdi/paint.cpp (L346-L347)

However, handling things above U+FFFF doesn't really require extra effort. It's enough to:

  • Put all characters to the output buffer
  • Set the first width to cluster width and the rest to 0
  • Sit back and relax while Windows does the rest

Validation Steps Performed

@echo off
chcp 65001

echo 𠜎𠝹𠱓𠱸𠲖𠳏𠳕𠴕𠵼𠵿𠸎
echo 👨👩👧👦

Save this as a UTF-8 cmd file and run.

Before the change

image

After the change

image

An example of a third party app working with surrogate pairs in a patched OpenConsole:
image

As discussed, this change doesn't claim to be the full support for surrogate pairs (there are still corner cases possible), but brings it on par with Terminal with minimal effort.

**Original Pull Request:** https://github.com/microsoft/terminal/pull/10580 **State:** closed **Merged:** Yes --- <!-- 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)? --> ## Implementation of #10477 - handle surrogate pairs in GDI renderer. <!-- Please review the items on the PR checklist before submitting--> ## PR Checklist * [ ] Closes #10477 * [x] CLA signed. * [ ] Tests added/passed * [ ] Documentation updated. * [ ] Schema updated. * [x] 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: #10477 <!-- 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 ### Why not let Windows draw surrogate pairs? It can do that. Basically, the comment says everything: https://github.com/microsoft/terminal/blob/c90de692509b074bfde191910d67154cfe389911/src/renderer/gdi/paint.cpp#L346-L347 However, handling things above U+FFFF doesn't really require extra effort. It's enough to: - Put *all* characters to the output buffer - Set the first width to cluster width and the rest to 0 - Sit back and relax while Windows does the rest <!-- Describe how you validated the behavior. Add automated tests wherever possible, but list manual validation steps taken as well --> ## Validation Steps Performed ```CMD @echo off chcp 65001 echo 𠜎𠝹𠱓𠱸𠲖𠳏𠳕𠴕𠵼𠵿𠸎 echo 👨👩👧👦 ``` Save this as a UTF-8 cmd file and run. ### Before the change ![image](https://user-images.githubusercontent.com/11453922/122832196-ed438880-d2e2-11eb-93dd-931954efedbf.png) ### After the change ![image](https://user-images.githubusercontent.com/11453922/122832217-f2a0d300-d2e2-11eb-99f0-e129e5544667.png) An example of a third party app working with surrogate pairs in a patched OpenConsole: ![image](https://user-images.githubusercontent.com/11453922/122838225-837cac00-d2ed-11eb-8faf-dbeb52f77916.png) As discussed, this change doesn't claim to be the full support for surrogate pairs (there are still corner cases possible), but brings it on par with Terminal with minimal effort.
claunia added the pull-request label 2026-01-31 09:26:28 +00:00
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Reference: starred/terminal#28119
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