- Only update when pixmap content actually change;
- Only update the regions that acutally changed.
This is a worthwhile optimization, but it doesn't completely remove
the bottleneck, as mesa still uploads then entire texture whenever
it changes.
Add XSERV_t, TRANS_SERVER, TRANS_REOPEN to quash warnings.
Add #include <dix-config.h> or <xorg-config.h>, as appropriate, to all
source files in the xserver/xorg tree, predicated on defines of
HAVE_{DIX,XORG}_CONFIG_H. Change all Xfont includes to
<X11/fonts/foo.h>.