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3d96929596
Fix the problem of memory leak in gradient pixmap generating. The problem caused by we do not call glDeleteShader when destroy a shader program. This patch will split the gradient pixmap generating to three category. If nstops < 6, we will use the no array version of the shader, which has the best performance. Else if nstops < 16, we use array version of the shader, which is compiled and linked at screen init stage. Else if nstops > 16, we dynamically create a new shader program, and this program will be cached until bigger nstops. 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.
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