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fa74a213ad
We firstly get the render area by clipping the trapezoid with the clip rect, then split the clipped area into small triangles and use the composite logic to generate the result directly. This manner is fast but have the problem that some implementation of GL do not implement the Anti-Alias of triangles fill, so the edge sometimes has sawtooth. It is not acceptable when use trapezoid to approximate circles and wide lines. Signed-off-by: Junyan He <junyan.he@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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