The Windows text cursor vanished: masked-color invert was treated as transparent #270

2026-08-16T16:52:00Z

HitFrostbite commented

2026-08-16 16:52:00 +00:00

Summary

Alpha-less colour cursors (Windows 11 coloured I-beam, some high-DPI system cursors) use the AND mask plus the colour bitmap as XOR — the same four-state table as monochrome.
AND=1 with a non-zero colour pixel is invert, not transparent. The old helper dropped those pixels, so the client installed a fully-transparent pointer over every text field.
Same invert-to-black + white-outline approximation as the monochrome converter, with tests. Confirmed on glass after deploying the host.

Test plan

Hover text on a Windows host (Notepad / browser) — I-beam stays visible
Arrow / hand / resize still look right
cargo test -p pf-capture --lib a_masked_color (Windows)

## Summary - Alpha-less colour cursors (Windows 11 coloured I-beam, some high-DPI system cursors) use the AND mask plus the colour bitmap as XOR — the same four-state table as monochrome. - AND=1 with a non-zero colour pixel is invert, not transparent. The old helper dropped those pixels, so the client installed a fully-transparent pointer over every text field. - Same invert-to-black + white-outline approximation as the monochrome converter, with tests. Confirmed on glass after deploying the host. ## Test plan - [x] Hover text on a Windows host (Notepad / browser) — I-beam stays visible - [x] Arrow / hand / resize still look right - [ ] `cargo test -p pf-capture --lib a_masked_color` (Windows)

HitFrostbite added 1 commit 2026-08-16 16:52:03 +00:00

fix(capture/windows): a masked-color I-beam was forwarded as a fully transparent pointer

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639886357d

AND=1 plus a non-zero colour pixel is invert, not transparent. Treating it as a simple alpha mask dropped the text cursor, so the client installed nothing over every text field.

Co-authored-by: Cursor <cursoragent@cursor.com>

enricobuehler referenced this issue from a commit

2026-08-16 19:27:58 +00:00

fix(capture/windows): the masked-color belt failed loud, and two tests outlived their helper

enricobuehler merged commit bb94dce7b0 into main

2026-08-16 19:58:31 +00:00

enricobuehler deleted branch worktree-windows-masked-color-ibeam

2026-08-16 19:58:32 +00:00

enricobuehler referenced this issue from a commit

2026-08-16 20:43:25 +00:00

feat(web): client logs join the host log on one timeline instead of a table below it

enricobuehler referenced this issue from a commit

2026-08-16 20:43:25 +00:00