65dd1ba7b3
tranformAbsolute has a pretty simple job, that of running the X/Y values from a device through the transformation matrix. The tricky bit comes when the current device state doesn't include one of the values. In that case, the last delivered value is back-converted to device space and used instead. The logic was twisted though, confusing GCC's uninitialized value detection logic and emitting warnings. This has been fixed by changing the code to: 1) Detect whether the ValuatorMask includes X/Y values 2) If either are missing, back-convert the current values into ox/oy 3) When X/Y are present, set ox/oy to the current value 4) Transform 5) Store X/Y values if changed or if they were set before. Signed-off-by: Keith Packard <keithp@keithp.com> Reviewed-by: Peter Hutterer <peter.hutterer@who-t.net>
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