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[PR #16760] Make shaded block glyphs look even betterer #30989

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opened 2026-01-31 09:44:23 +00:00 by claunia · 0 comments
claunia commented 2026-01-31 09:44:23 +00:00
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Original Pull Request: https://github.com/microsoft/terminal/pull/16760

State: closed
Merged: Yes

Shaded glyphs (U+2591..3, etc.) all have one problem in common:
The cell size may not be evenly divisible by the pixel/dot size in
the glyph. This either results in blurring, or in moiré-like patterns
at the edges of the cells with its neighbors, because they happen to
start with a pattern that overlaps with the end of the previous cell.

This PR solves the issue by moving the pixel/dot pattern generation
into the shader. That way the pixel/dot location can be made dependent
on the viewport-position of the actual underlying pixels, which avoids
repeating patterns between cells.

The PR contains some additional modifications, all of which either
extend or improve the existing debug facilities in AtlasEngine.
Suppressing whitespaces changes makes the diff way smaller.

**Original Pull Request:** https://github.com/microsoft/terminal/pull/16760 **State:** closed **Merged:** Yes --- Shaded glyphs (U+2591..3, etc.) all have one problem in common: The cell size may not be evenly divisible by the pixel/dot size in the glyph. This either results in blurring, or in moiré-like patterns at the edges of the cells with its neighbors, because they happen to start with a pattern that overlaps with the end of the previous cell. This PR solves the issue by moving the pixel/dot pattern generation into the shader. That way the pixel/dot location can be made dependent on the viewport-position of the actual underlying pixels, which avoids repeating patterns between cells. The PR contains some additional modifications, all of which either extend or improve the existing debug facilities in AtlasEngine. Suppressing whitespaces changes makes the diff way smaller.
claunia added the pull-request label 2026-01-31 09:44:23 +00:00
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Reference: starred/terminal#30989
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