[Bug 773433] video-format: add API to check if a video format is "sparse"

[GStreamer (GNOME Bugzilla)]

https://bugzilla.gnome.org/show_bug.cgi?id=773433

--- Comment #7 from Sebastian Dröge (slomo) <slomo at coaxion.net> ---
(In reply to Philippe Renon from comment #6)

> About ABI : I preferred to add the new flag in a "correct" position and not
> at the end. But I can move it at the end if it is critical. Not sure it is
> as you are not supposed to access the bit field directly but use macros for
> that.

It's critical, yes :) As it's macros and not functions, the actual values of
the enum are used by the compiler. If you change it in the header,
recompilation of all code using those values is needed as now suddenly e.g. 2
means Y instead of X as before.

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