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[PR #17724] Fix misalignment of Sixel image slices #31339

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opened 2026-01-31 09:46:39 +00:00 by claunia · 0 comments
claunia commented 2026-01-31 09:46:39 +00:00
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Original Pull Request: https://github.com/microsoft/terminal/pull/17724

State: closed
Merged: Yes

Summary of the Pull Request

When we have a series of image slices of differing widths, which also
don't align with the cell boundaries, we can get rounding errors in the
scaling which makes the different slices appear misaligned.

This PR fixes the issue by removing the 4 pixel width alignment that was
enforced in the ImageSlice class, since that's not actually necessary
when the pixels themselves are already 4 bytes in size. And without
that, the widths should be correctly aligned with the cell boundaries.

References and Relevant Issues

The initial Sixel implementation was added in PR #17421.

Validation Steps Performed

I've confirmed that this fixes the rendering glitches reported in
#17711, and all my existing Sixel tests still work as expected.

PR Checklist

**Original Pull Request:** https://github.com/microsoft/terminal/pull/17724 **State:** closed **Merged:** Yes --- ## Summary of the Pull Request When we have a series of image slices of differing widths, which also don't align with the cell boundaries, we can get rounding errors in the scaling which makes the different slices appear misaligned. This PR fixes the issue by removing the 4 pixel width alignment that was enforced in the `ImageSlice` class, since that's not actually necessary when the pixels themselves are already 4 bytes in size. And without that, the widths should be correctly aligned with the cell boundaries. ## References and Relevant Issues The initial Sixel implementation was added in PR #17421. ## Validation Steps Performed I've confirmed that this fixes the rendering glitches reported in #17711, and all my existing Sixel tests still work as expected. ## PR Checklist - [x] Closes #17711
claunia added the pull-request label 2026-01-31 09:46:39 +00:00
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Reference: starred/terminal#31339
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