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[PR #6493] Add fast path to til::bitmap::translate using bitshifts #26715

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opened 2026-01-31 09:17:43 +00:00 by claunia · 0 comments
claunia commented 2026-01-31 09:17:43 +00:00
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Original Pull Request: https://github.com/microsoft/terminal/pull/6493

State: closed
Merged: Yes

Summary of the Pull Request

Add a fast path to til::bitmap::translate: use bit shifts when the delta is vertical.

Performance while printing the content of a big file, with the patch from #6492 which hasn't been merged yet, in Release mode:

Before:
image

After:
image

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PR Checklist

  • Closes #xxx
  • CLA signed. If not, go over here and sign the CLA
  • Tests added/passed
  • Requires documentation to be 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

Validation Steps Performed

**Original Pull Request:** https://github.com/microsoft/terminal/pull/6493 **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)? --> ## Summary of the Pull Request Add a fast path to `til::bitmap::translate`: use bit shifts when the delta is vertical. Performance while printing the content of a big file, with the patch from #6492 which hasn't been merged yet, in Release mode: Before: ![image](https://user-images.githubusercontent.com/56923875/84576235-6e546f80-adb3-11ea-8240-d2fecaf9a812.png) After: ![image](https://user-images.githubusercontent.com/56923875/84576661-bf199780-adb6-11ea-90eb-a4ed629c8458.png) <!-- Other than the issue solved, is this relevant to any other issues/existing PRs? --> ## References <!-- 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 * [ ] Requires documentation to be 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 <!-- Describe how you validated the behavior. Add automated tests wherever possible, but list manual validation steps taken as well --> ## Validation Steps Performed
claunia added the pull-request label 2026-01-31 09:17:43 +00:00
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Reference: starred/terminal#26715
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