oak-gpui

Files

T

Smit Barmase a13881746a editor: APCA contrast (#37165 )

Closes #35787
Closes #17890
Closes #28789
Closes #36495

How it works:

For highlights (and selections) within the visible rows of the editor,
we split them row by row. This is efficient since the number of visible
rows is constant. For each row, all highlights and selections, which may
overlap, are flattened using a line sweep. This produces non-overlapping
consecutive segments for each row, each with a blended background color.

Next, for each row, we split text runs into smaller runs to adjust its
color using APCA contrast. Since both text runs and segment are
non-overlapping and consecutive, we can use two-pointer on them to do
this.

For example, a text run for the variable red might be split into two
runs if a highlight partially covers it. As a result, one part may
appear as red, while the other appears as a lighter red, depending on
the background behind it.


Result:

<img width="1458" height="949" alt="image"
src="https://github.com/user-attachments/assets/4814c93d-12e7-4b4d-8542-d912acccfb8e"
/>

<img width="1459" height="952" alt="image"
src="https://github.com/user-attachments/assets/9e497b6c-3e66-43e8-8e5b-f634dd5ee8d3"
/>

<img width="1457" height="621" alt="image"
src="https://github.com/user-attachments/assets/8dfa6ce5-f46b-45b9-8008-66169d5aecd4"
/>

Release Notes:

- Improved text contrast when selected or highlighted in the editor.