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9e4567afe6
If the pixmap is write-only, then use a pbo mapping will not get too much benefit. And even worse, when the software rendering is access this mapped data range, it's much slower than just using a system memory. From the glamor_prepare_access glamor_finish_access view, we have two options here: option 1: 1.0 create a pbo 1.1 copy texture to the pbo 1.2 map the pbo to va 1.3 access the va directly in software rendering. 1.4 bind the pbo as unpack buffer & draw it back to texture. option 2: 2.0 allocate a block memory in system memory space. 2.1 read the texture memory to the system memory. 2.2 access the system memory and do rendering. 2.3 draw the system memory back to texture. In general, 1.1 plush 1.2 is much faster than 2.1. And 1.3 is slower than 2.2. 1.4 is faster than 2.3. If the access mode is read only or read write, option 1 may be fater, but if the access mode is write only. Then most of the time option 1 is much faster. 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
following article:
http://en.wikipedia.org/wiki/X_server
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