support for the DOUBLE-BUFFER extension to the Xprint server and DDX.
Additionally a "pixmap-scrubber" optimisation is added to the
PostScript DDX to remove all content from a vector pixmap when a
|PolyFillRect()| call covers the whole pixmap surface with a solid fill
(this avoids that a backbuffer vector pixmap gets constantly filled
even when the content is not visible anymore after |XdbeSwapBuffers()|
has cleared the hidden buffer with the background color).
not, DamageSetup will wrap some operations first, and the cw
initializes during ExtensionInit, so cw comes higher in the wrapping
chain. cw going first will result in damage getting confused when the
drawables get changed around.
has several issues, including:
- CopyWindow and PaintWindow wrappers missing (will be done soon)
- Some segfaults seen in the Render wrappers.
- Xprt server build breaks with Composite.
- DDXs must be recompiled for Composite due to VisualRec size change.
- Composite bugs pointed out by Deron Johnson in email.
Also, reorder XFixes initialization according to comments by Keith which
are also in xserver CVS.
