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0706423bcf
By default, mask picture is newly created, and each time we need to clear the whole mask picture, and then composite glyphs to the mask picture and then composite the mask picture to destination. Testing results shows that the filling of the mask picture takes a big portion of the rendering time. As we don't really need to clear the whole region, we just need to clear the real overlapped region. This commit is to solve this issue. We split a large glyphs list to serval lists and each list is non-overlapped or overlapped. we can reduce the length of overlapped glyphs to do the glyphs_via_mask to 2 or 3 glyphs one time for most cases. Thus it give us a case to allocate a small portion of the corresponding cache directly as the mask picture. Then we can rendering the glyphs to this mask picture, and latter we can accumulate the second steps, composite the mask to the dest with the other non-overlapped glyphs's rendering process. It also make us implement a batch mask cache blocks clearing algorithm to avoid too frequently small region clearing. If there is no any overlapping, this method will not get performance gain. If there is some overlapping, then this algorithm can get about 15% performance gain. 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
All questions regarding this software should be directed at the
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