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staging: add ext-blur-v1

Xaver Hugl requested to merge Zamundaaa/wayland-protocols:work/ext-blur into main

This protocol allows the client to specify a region behind the surface that should be blurred, with the intention to improve the visuals of for example panels or terminals.

This protocol is based on the org_kde_kwin_blur protocol, which has been in use since 2015.

Signed-off-by: Xaver Hugl xaver.hugl@kde.org

The changes vs !43 are:

  • I adjusted the naming and "unstable" disclaimer to how newer protocols are done
  • The object becomes inert when the surface is destroyed, instead of having an error for that case
  • the initial region is empty, which is more similar to how other protocols deal with this sort of extension (=don't change anything by default)

Implementations:

TODO:

  • without !149, this can lead to more or less of the surface being blurred than is intended with fractional scaling, so surface-local coordinates are maybe not the best
  • how to deal with anti-aliased rounded corners? Using a whole alpha buffer for the blur mask seems like the only option for that
Edited by Xaver Hugl

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