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2122e60bf9
We find in some cases the trapezoid will be render as a triangle and the left edge and right edge will cross with each other just bellow the top or over the bottom. The distance between the cross poind and the top or bottom is less than pixman_fixed_1_minus_e, so after the fixed converted to int, the cross point has the same value with the top or botton and the triangle should not be affected. But in our clip logic, the cross point will be clipped out. So add a logic to fix this problem. 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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