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Normally composite will decide to add implicit redirection when a window with an alternate visual is a parent of a window with a regular visual or vice versa. This uses extra pixmap memory and incurs an extra copy. This exception mechanism provides a way for a DDX to override this if the DDX knows that its acceleration architecture will render correctly. The relevant case is that of an RGB window reparented into a ARGB parent frame window. If the DDX knows that the acceleration architecture in use will pad the alpha channel to opaque when rendering to the RGB window, the implicit redirection can be avoided. This patch adds a new composite function: CompositeRegisterImplicitRedirectionException() which lets a DDX register a pair of parent and child window visuals, that will not be implicitly redirected even if the normal policy would have made that choice. Signed-off-by: Kristian Høgsberg <krh@bitplanet.net> Reviewed-by: Keith Packard <keithp@keithp.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
Xorg mailing list:
http://lists.freedesktop.org/mailman/listinfo/xorg
Please submit bug reports to the Xorg bugzilla:
https://bugs.freedesktop.org/enter_bug.cgi?product=xorg
The master development code repository can be found at:
git://anongit.freedesktop.org/git/xorg/xserver
http://cgit.freedesktop.org/xorg/xserver
For patch submission instructions, see:
http://www.x.org/wiki/Development/Documentation/SubmittingPatches
For more information on the git code manager, see:
http://wiki.x.org/wiki/GitPage