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bd180be619
The old manner of trapezoid render uses pixman to generate a mask pixmap and upload it to the GPU. This effect the performance. We now use shader to generate the temp trapezoid mask to avoid the uploading of this pixmap. We implement a anti-alias manner in the shader according to pixman, which will caculate the area inside the trapezoid dividing total area for every pixel and assign it to the alpha value of that pixel. The pixman use a int-to-fix manner to approximate but the shader use float, so the result may have some difference. Because the array in the shader has optimization problem, we need to emit the vertex of every trapezoid every time, which will effect the performance a lot. Need to improve it. 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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