[Wayland-bugs] [Bug 78190] protocol: Reporting damage in surface coordinates doesn't work with EGL

[bugzilla-daemon at freedesktop.org]

https://bugs.freedesktop.org/show_bug.cgi?id=78190

--- Comment #11 from Jason Ekstrand <jason at jlekstrand.net> ---
(In reply to Pekka Paalanen from comment #10)
> My recent reasoning about interface version backward compatibility is an
> argument for not changing wl_surface.damage semantics in a version bump.
> Instead, we should add a new request.
> 
> See:
> http://lists.freedesktop.org/archives/wayland-devel/2014-October/017687.html
> 
> "Don't modify old protocol just by version, it won't be backward
> compatible." seems like a good mantra to me.

The only reason why changing damage coordinates would work is precicely because
it's not backwards compatable.  Backwards is broken.  If we add a new request,
then EGL implementations will continue to happily report damage in buffer
coordinates to the request that needs surface coordinates and ignore the one
that takes buffer coordinates.

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