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Provide default modules that may be overrided easily. Previously the
server would load a set of default modules, but only if none were
specified in the xorg.conf, or if you didn't have a xorg.conf at all. This
patch provides a default set and you can add only the "Load" instructions
to xorg.conf that you want without losing the defaults. Similarly, if you
don't want to load a module that's loaded by default, you can add "Disable
modulename" to your xorg.conf (see man xorg.conf in this release for
details). This allows for a minimal "Modules" section, where the user only
need specify what they want to be different. See bug #10541 for more.

The list of default modules is taken from the set loaded by default when
there was a xorg.conf containing no "Modules" section.

A potential problem for some users is that some users disable a module,
most notably DRI, by commenting out the "Load" line in their xorg.conf.
This needs to be changed to an uncommented "Disable" line, as DRI is
loaded by default.

This new function walks the composite region and calls a rectangle
compositing function on each compositing rectangle. Previously there
were buggy duplicates of this code in fbcompose.c and
miext/rootles/safealpha/safeAlphaPicture.c.

This is phase one of getting the two region walkers in fbcompose.c and
fbpict.c merged together.

Previously, the new mode was added at the head of the list.  This caused the
positional correspondence between modes and the XMesaVisuals array to be off
by one.  The net result was GLX clients failing when they tried to use the
last GLX mode/visual.

We still have the problem of DRI drivers not being able to use the extra
mode/visual introduced by __glXCreateARGBConfig().  glXCreateContext fails
with BadAlloc if it's attempted.  This is also the source of the often-
seen warning "libGL warning: 3D driver claims to not support visual xxx"
Look into fixing that someday...

We try to get OSNAME from uname by default now.

Problem reported by Derek Abdine of rapid7.com. Thanks.

Convert the remaining callers to PixmapDirty.

* Don't need to track damage.
* Always migrate for fallbacks.

* Centralize handling of fallbacks and damage tracking.
* Always migrate for fallbacks.

* Centralize handling of fallbacks and damage tracking.
* Always migrate for fallbacks.

Only migrate when appropriate. In particular, don't migrate to offscreen in the
no-fallback case as copying from system memory should usually be as fast if not
faster than DownloadFromScreen, in particular if the bits need to be uploaded
to offscreen first.

* Migrate for fallbacks when appropriate.
* Add damage tracking in ExaCheckPutImage.

* Don't waste effort on invisible glyphs.
* Only track damage for bounding box instead of each glyph separately.
* Always migrate for fallbacks.

Committed separately as this case is hard to hit and has only been tested
lightly.

* Defer to simpler hooks in more cases (inspired by XAA behaviour).
* Move damage tracking from lower to higher level functions.
* Always migrate for fallbacks.

* Don't waste effort on invisible glyphs.
* Add damage tracking where necessary.
* Always migrate for fallbacks.

* Convert rects to region and use it for damage tracking.
* When possible, defer to exaFillRegion{Solid,Tiled} using converted region.
* Always migrate for fallbacks.
* Move damage tracking out of ExaCheckPolyFillRect.

* Support planemasks, different ALUs and arbitrary tile origin.
* Leave damage tracking and non-trivial fallbacks to callers.
* Always migrate for fallbacks.

This is in preparation for using these from more other functions.

* Return early if the valid region is empty or the pixmap is pinned.
* Fix loop for several cliprects.

More msvc++ porting

Make sure both halves of the dst word is set to zero when the masks
are both 0.

- Changes to support MS Visual C++

- use inline instead of __inline__

- Fix rounding errors (Billy Biggs, from xserver via pixman)

Call miHandleExposures() in CopyArea/CopyPlane explicitly in cw to
generate GraphicsExposes correctly.

Make use of fbCompositeSrcAdd_8888x8x8mmx

- Remove stray default label

- Integrate new MMX ops SolidMaskSrc_nx8x8888mmx, In_8x8mmx, and
  In_nx8x8mmx

- Formatting changes to reduce diff noise

Make sure fbCompositeSrc_x888x8x8888mmx and fbCompositeSrc_8888x8x8888mmx
are used when possible.

- Move some code around to minimize diff noise

- Add mmx ops from pixman that never made it into X

- Merge Jeff Muizelaar's bugfixes to fbCompositeSrc_8888x8x8888mmx and
  fbCompositeSrc_x888x8x8888mmx.

Requirement was introduced with c7e2ba0c.

Some rearrangement of code to get it closer to pixman.