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shm: don't bother with xrgb surfaces, always use argb

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Before this patch, foot used xrgb surfaces for all fully opaque
surfaces, and only used argb surfaces for the main window when the
user enabled translucency.

However, several compositors have damage-like issues when we switch
between opaque and non-opaque surfaces (for example, when switching
color theme, or when toggling fullscreen).

Since the performance benefit of using non-alpha aware surfaces are
likely minor (if there's any measurable performance difference at
all!), lets workaround these compositor issues by always using argb
surfaces.
This commit is contained in:
Daniel Eklöf 2026-01-04 07:57:25 +01:00
parent 42e04c5c87
commit b78cc92322
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7 changed files with 42 additions and 79 deletions
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CHANGELOG.md
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@ -92,6 +92,11 @@
contains at least one upper case character.
* Mouse tracking in SGR pixel mode no longer emits negative column/row
pixel values ([#2226][2226]).
* Foot now always uses ARGB SHM surfaces. In earlier versions, XRGB
surfaces were used for opaque surfaces. Unfortunately, several
compositors had issues when foot switched between ARGB and XRGB
surfaces (for example when switching color theme, or toggling
fullscreen).
[2202]: https://codeberg.org/dnkl/foot/issues/2202
[2226]: https://codeberg.org/dnkl/foot/issues/2226