[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 #6 from Philippe Renon <philippe_renon at yahoo.fr> ---
The word sparse comes from video-format.h itself:

 * @GST_VIDEO_FORMAT_RGBx: sparse rgb packed into 32 bit, space last
 * @GST_VIDEO_FORMAT_BGRx: sparse reverse rgb packed into 32 bit, space last
 * @GST_VIDEO_FORMAT_xRGB: sparse rgb packed into 32 bit, space first
 * @GST_VIDEO_FORMAT_xBGR: sparse reverse rgb packed into 32 bit, space first

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.

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