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[PR #17708] Add support for querying the DECCTR color table report #31329

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opened 2026-01-31 09:46:36 +00:00 by claunia · 0 comments
claunia commented 2026-01-31 09:46:36 +00:00
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Original Pull Request: https://github.com/microsoft/terminal/pull/17708

State: closed
Merged: Yes

Summary of the Pull Request

This PR introduces the framework for the DECRQTSR sequence which is
used to query terminal state reports. But for now I've just implemented
the DECCTR color table report, which provides a way for applications
to query the terminal's color scheme.

References and Relevant Issues

This is the counterpart to the the DECRSTS sequence, which is used to
restore a color table report. That was implemented in PR #13139, but it
only became practical to report the color table once conpty passthrough
was added in PR #17510.

Detailed Description of the Pull Request / Additional comments

This sequence has the option of reporting the colors as either HLS or
RGB, but in both cases the resolution is lower than 24 bits, so the
colors won't necessarily round-trip exactly when saving and restoring.
The HLS model in particular can accumulate rounding errors over time.

Validation Steps Performed

I've added a basic unit test that confirms the colors are reported as
expected for both color models. The color values in these tests were
obtained from color reports on a real VT525 terminal.

PR Checklist

  • Tests added/passed
**Original Pull Request:** https://github.com/microsoft/terminal/pull/17708 **State:** closed **Merged:** Yes --- ## Summary of the Pull Request This PR introduces the framework for the `DECRQTSR` sequence which is used to query terminal state reports. But for now I've just implemented the `DECCTR` color table report, which provides a way for applications to query the terminal's color scheme. ## References and Relevant Issues This is the counterpart to the the `DECRSTS` sequence, which is used to restore a color table report. That was implemented in PR #13139, but it only became practical to report the color table once conpty passthrough was added in PR #17510. ## Detailed Description of the Pull Request / Additional comments This sequence has the option of reporting the colors as either HLS or RGB, but in both cases the resolution is lower than 24 bits, so the colors won't necessarily round-trip exactly when saving and restoring. The HLS model in particular can accumulate rounding errors over time. ## Validation Steps Performed I've added a basic unit test that confirms the colors are reported as expected for both color models. The color values in these tests were obtained from color reports on a real VT525 terminal. ## PR Checklist - [x] Tests added/passed
claunia added the pull-request label 2026-01-31 09:46:36 +00:00
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