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1f83411c9a
Almost all callers will check whether the regions is empty before call to this internal API, but it seems the glamor_composite_with_copy may call into here with a zero nbox. A little weird, as the miComputeCompositeRegion return a Non-NULL, but the region is empty. Also remove a unecessary glflush. So let's check it here. Signed-off-by: Zhigang Gong <zhigang.gong@linux.intel.com>
X Server
The X server accepts requests from client applications to create windows,
which are (normally rectangular) "virtual screens" that the client program
can draw into.
Windows are then composed on the actual screen by the X server
(or by a separate composite manager) as directed by the window manager,
which usually communicates with the user via graphical controls such as buttons
and draggable titlebars and borders.
For a comprehensive overview of X Server and X Window System, consult the
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http://en.wikipedia.org/wiki/X_server
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